Product Specification
MAIN FEATURES
8-bit resolution.
ADC gain adjust.
1.5 GHz full power input bandwidth.
1 Gsps (min) sampling rate.
SINAD = 44.3 dB (7.2 Effective Bits) SFDR = 58 dBc
@ FS = 1 Gsps, FIN = 20 MHz :
SINAD = 42.9 dB (7.0 Effective Bits) SFDR = 52 dBc
@ FS = 1 Gsps, FIN = 500 MHz :
SINAD = 40.3dB (6.8 Effective Bits) SFDR = 50 dBc
@ FS = 1 Gsps, FIN = 1000 MHz (-3 dB FS)
2-tone IMD : -52dBc (489 MHz, 490 MHz) @ 1GSPS.
DNL = 0.3 LSB INL = 0.7 LSB.
Low Bit Error Rate (10-13 ) @ 1 Gsps
Very low input capacitance : 3 pF
500 mVpp differential or single-ended analog inputs.
Differential or single-ended 50Ω ECL compatible clock inputs.
ECL or LVDS/HSTL output compatibility.
Data ready output with asynchronous reset.
Gray or Binary selectable output data ; NRZ output mode.
Power consumption : 3.4 W @ Tj = 70°C typical
CQFP package enhanced with heatspreader : Rthjc = 1.56°C/W
Dual power supply : ± 5 V
Radiation tolerance oriented design (150 Krad (Si) measured).
APPLICATIONS
Digital Sampling Oscilloscopes.
Satellite receiver.
Electronic countermeasures / Electronic warfare.
Direct RF down–conversion.
SCREENING
Mil-PRF-38535, QML level Q for package version, DSCC 5962-0050401QYC
Space screening according to ESA/SCC 9000.
Temperature range: up to -55°C < Tc ; Tj < +125°C
DESCRIPTION
The TS8388BFS is a monolithic 8–bit analog–to–digital converter, designed for
digitizing wide bandwidth analog signals at very high sampling rates of up to 1
Gsps.
The TS8388BFS is using an innovative architecture, including an on chip Sample
and Hold (S/H), and is fabricated with an advanced high speed bipolar process.
The on–chip S/H has a 1.5 GHz full power input bandwidth, providing excellent
dynamic performance in undersampling applications (High IF digitizing).
FS Suffix : CQFP 68
Ceramic Quad Flat Pack
With heatspreader
ADC 8-bit 1 Gsps
TS8388BFS
1/ Die form : JTS8388B
2/ Evaluation board :
TSEV8388BF
3/ Demultiplexer :
TS81102G0 : companion device available
January 2002
2TS8388BFS
Product Specification
TABLE OF CONTENTS
1. SIMPLIFIED BLOCK DIAGRAM....................................................................................................................................3
2. FUNCTIONAL DESCRIPTION ........................................................................................................................................3
3. SPECIFICATIONS..............................................................................................................................................................4
3.1. ABSOLUTE MAXIMUM RATINGS (SEE NOTES BELOW).................................................................................................................... 4
3.2. RECOMMENDED CONDITIONS OF USE ............................................................................................................................................. 4
3.3. ELECTRICAL OPERATING CHARACTERISTICS ................................................................................................................................. 5
3.4. TIMING DIAGRAMS................................................................................................................................................................................ 9
3.5. EXPLANATION OF TEST LEVELS ...................................................................................................................................................... 10
3.6. FUNCTIONS DESCRIPTION................................................................................................................................................................ 10
3.7. DIGITAL OUTPUT CODING ................................................................................................................................................................. 10
4. PACKAGE DESCRIPTION. ............................................................................................................................................11
4.1. TS8388BFS PIN DESCRIPTION .......................................................................................................................................................... 11
4.2. TS8388BFS PINOUT ............................................................................................................................................................................ 12
4.3. OUTLINE DIMENSIONS – 68 PINS CQFP .......................................................................................................................................... 13
4.4. THERMAL CHARACTERISTICS .......................................................................................................................................................... 14
5. TYPICAL CHARACTERIZATION RESULTS .............................................................................................................15
5.1. STATIC LINEARITY – FS = 50 MSPS / FIN = 10 MHZ......................................................................................................................... 15
5.2. EFFECTIVE NUMBER OF BITS VERSUS POWER SUPPLIES VARIATION ..................................................................................... 16
5.3. TYPICAL FFT RESULTS ...................................................................................................................................................................... 17
5.4. SPURIOUS FREE DYNAMIC RANGE VERSUS INPUT AMPLITUDE ................................................................................................ 18
5.5. DYNAMIC PERFORMANCE VERSUS ANALOG INPUT FREQUENCY ............................................................................................. 20
5.6. EFFECTIVE NUMBER OF BITS (ENOB) VERSUS SAMPLING FREQUENCY .................................................................................. 21
5.7. SFDR VERSUS SAMPLING FREQUENCY ......................................................................................................................................... 21
5.8. TS8388BFS ADC PERFORMANCES VERSUS JUNCTION TEMPERATURE ................................................................................... 22
5.9. TYPICAL FULL POWER INPUT BANDWIDTH .................................................................................................................................... 23
5.10. ADC STEP RESPONSE................................................................................................................................................................... 24
6. DEFINITION OF TERMS ................................................................................................................................................25
7. TS8388BFS MAIN FEATURES .......................................................................................................................................27
7.1. TIMING INFORMATIONS ..................................................................................................................................................................... 27
7.2. PRINCIPLE OF DATA READY SIGNAL CONTROL BY DRRB INPUT COMMAND............................................................................ 28
7.3. ANALOG INPUTS (VIN) (VINB) ............................................................................................................................................................ 28
7.4. CLOCK INPUTS (CLK) (CLKB) ............................................................................................................................................................ 29
7.5. NOISE IMMUNITY INFORMATIONS.................................................................................................................................................... 32
7.6. DIGITAL OUTPUTS .............................................................................................................................................................................. 32
7.7. OUT OF RANGE BIT................................................................................................................................................................................... 34
7.8. GRAY OR BINARY OUTPUT DATA FORMAT SELECT...................................................................................................................... 35
7.9. DIODE PIN 49 ....................................................................................................................................................................................... 35
7.10. ADC GAIN CONTROL PIN 60.......................................................................................................................................................... 36
8. EQUIVALENT INPUT / OUTPUT SCHEMATICS ......................................................................................................37
8.1. EQUIVALENT ANALOG INPUT CIRCUIT AND ESD PROTECTIONS ................................................................................................ 37
8.2. EQUIVALENT ANALOG CLOCK INPUT CIRCUIT AND ESD PROTECTIONS................................................................................... 37
8.3. EQUIVALENT DATA OUTPUT BUFFER CIRCUIT AND ESD PROTECTIONS .................................................................................. 38
ADC GAIN ADJUST EQUIVALENT INPUT CIRCUITS AND ESD PROTECTIONS.......................................................................................... 38
8.5. GORB EQUIVALENT INPUT SCHEMATIC AND ESD PROTECTIONS.............................................................................................. 39
8.6. DRRB EQUIVALENT INPUT SCHEMATIC AND ESD PROTECTIONS .............................................................................................. 39
9. TSEV8388BFS : DEVICE EVALUATION BOARD ......................................................................................................40
10. ORDERING INFORMATION .....................................................................................................................................41
10.1. PACKAGE DEVICE .......................................................................................................................................................................... 41
10.2. EVALUATION BOARD ..................................................................................................................................................................... 41
3
Product Specification
TS8388BFS
1. SIMPLIFIED BLOCK DIAGRAM
2. FUNCTIONAL DESCRIPTION
The TS8388BFS is an 8 bit 1GSPS ADC based on an advanced high speed bipolar technology featuring a cutoff frequency of 25 GHz.
The TS8388BFS includes a front-end master/slave Track and Hold stage (S/H), followed by an analog encoding stage and interpolation
circuitry.
Successive banks of latches are regenerating the analog residues into logical data before entering an error correction circuitry and a
resynchronization stage followed by 75 Ω differential output buffers.
The TS8388BFS works in fully differential mode from analog inputs up to digital outputs.
The TS8388BFS features a full power input bandwidth of 1.5 GHz.
Control pin GORB is provided to select either Gray or Binary data output format.
Gain control pin is provided in order to adjust the ADC gain.
A Data Ready output asynchronous reset (DRRB) is available on TS8388BFS.
The TS8388BFS uses only vertical isolated NPN transistors together with oxide isolated polysilicon resistors, which allow enhanced radiation
tolerance (no performance drift measured at 150kRad total dose).
VIN,VINB
CLK, CLKB
G=2 T/H G=1 T/H G=1
CLOCK
BUFFER
RESISTOR
CHAIN
ANALOG
ENCODING
BLOCK
INTERPOLATION
STAGES
REGENERATION
LATCHES
ERROR CORRECTION &
DECODE LOGIC
OUTPUT LATCHES &
BUFFERS
4
45
45
8
8
GAIN
DRRB DR,DRB GORB DATA,DATAB OR,ORB
MASTER/SLAVE TRACK & HOLD
4TS8388BFS
Product Specification
3. SPECIFICATIONS
3.1. ABSOLUTE MAXIMUM RATINGS (SEE NOTES BELOW)
Parameter Symbol Comments Value Unit
Positive supply voltage VCC GND to 6 V
Digital negative supply
voltage
DVEE GND to -5.7 V
Digital positive supply
voltage
VPLUSD GND-0.3 to 2.8 V
Negative supply voltage VEE GND to -6 V
Maximum difference
between negative supply
voltages
DVEE to VEE 0.3 V
Analog input voltages VIN or VINB -1 to +1 V
Maximum difference
between VIN and VINB
VIN - VINB -2 to +2 V
Digital input voltage VDGORB -0.3 to VCC +0.3 V
Digital input voltage VDDRRB VEE -0.3 to +0.9 V
Digital output voltage Vo VPLUSD-3 to VPLUSD -0.5 V
Clock input voltage VCLK or VCLKB -3 to +1.5 V
Maximum difference
between VCLK and VCLKB
VCLK - VCLKB -2 to +2 V
Maximum junction
temperature
Tj+135 oC
Storage temperature Tstg -65 to +150 oC
Lead temperature
(soldering 10s)
Tleads +300 oC
Notes : Absolute maximum ratings are limiting values (referenced to GND=0V), to be applied individually, while other parameters are within
specified operating conditions. Long exposure to maximum rating may affect device reliability.
The use of a thermal heat sink is mandatory (see Thermal characteristics).
3.2. RECOMMENDED CONDITIONS OF USE
Parameter Symbol Comments Min. Typ. Max. Unit
Positive supply voltage VCC 4.75 +5 5.25 V
Positive digital supply voltage VPLUSD ECL output compatibility GND V
VPLUSD LVDS output compatibility +1.4 +2.4 +2.6 V
Negative supply voltages VEE, DVEE -5.25 -5.0 -4.75 V
Differential analog input voltage
(Full Scale)
VIN, VINB
VIN -VINB
50 Ω differential or single-ended ±113
450
±125
500
±137
550
mV
mVpp
Clock input power level PCLK PCLKB 50 Ω single–ended clock input 3 4 10 dBm
Operating temperature range TJCommercial grade: “C”
Industrial grade: “V”
Military grade: “M”
0° < Tc ; Tj < 90°
-40° < Tc ; Tj < 110°
-55° < Tc ; Tj < +125
oC
5
Product Specification
TS8388BFS
3.3. ELECTRICAL OPERATING CHARACTERISTICS
VEE = DVEE = -5 V ; VCC = +5 V ; VIN -VINB = 500 mVpp Full Scale differential input ;
Digital outputs 75 or 50 Ω differentially terminated ;
Tj (typical) = 70°C. Full Temperature Range: up to –55°C<Tc; Tj<+125°C.
Parameter Symb Test
level
Min Typ Max Unit
POWER REQUIREMENTS
Positive supply voltage Analog
Digital (ECL)
Digital (LVDS)
VCC
VPLUSD
VPLUSD
1, 2, 6
4
4
4.7
1.4
5
0
2.4
5.3
2.6
V
V
V
Positive supply current Analog
Digital
ICC
IPLUSD
1, 2
6
1, 2
6
385
395
115
120
445
445
145
145
mA
mA
mA
mA
Negative supply voltage VEE 1, 2, 6 -5.3 -5 -4.7 V
Negative supply current Analog
Digital
AIEE
DIEE
1, 2
6
1, 2
6
165
170
135
145
200
200
180
180
mA
mA
mA
mA
Nominal power dissipation PD 1, 2
6
3.4
3.6
4.1
4.3
W
W
Power supply rejection ratio (note 2) PSRR 40.5 2mV/V
RESOLUTION 8bits
ANALOG INPUTS
Full Scale Input Voltage range (differential mode)
( 0 Volt common mode voltage )
VIN
VINB
4-125
-125
125
125
mV
mV
Full Scale Input Voltage range (single–ended input option )
(see Application
Notes)
VIN
VINB
4-250
0
250 mV
mV
Analog input capacitance CIN 4 3 3.5 pF
Input bias current IIN 410 20 µA
Input Resistance RIN 40.5 1 MΩ
Full Power input Bandwidth FPBW 41.3 1.5 GHz
Small Signal input Bandwidth (10 % full scale) SSBW 41.5 1.7 GHz
CLOCK INPUTS
Logic compatibility for clock inputs (note 10 )
(see Application Notes)
ECL or specified clock input
power level in dBm
ECL Clock inputs voltages (VCLK or VCLKB) : 4
• Logic “0” voltage VIL -1.5 V
• Logic “1” voltage VIH -1.1 V
• Logic “0” current IIL 550 µA
• Logic “1” current IIH 550 µA
Clock input power level into 50 Ω termination DBm into 50 Ω
Clock input power level 4-2 410 dBm
Clock input capacitance CCLK 4 3 3.5 pF
6TS8388BFS
Product Specification
Parameter Symb Test
level
Min Typ Max Unit
DIGITAL OUTPUTS (notes 1,6)
Single ended or differential input mode, 50 % clock duty cycle (CLK,CLKB), Binary output data format,
Tj (typical) = 70°C.
Logic compatibility for digital outputs
( Depending on the value of VPLUSD )
(see Application Notes)
ECL or LVDS
Differential output voltage swings ( assuming VPLUSD = 0V) :
75 Ω open transmission lines ( ECL levels )
75 Ω differentially terminated
50 Ω differentially terminated
4
1.50
0.70
0.54
1.620
0.825
0.660
V
V
V
Output levels ( assuming VPLUSD = 0V)
75 Ω open transmission lines (note 6)
4
• Logic “0” voltage VOL -1.62 -1.54 V
• Logic “1” voltage VOH -0.88 -0.8 V
Output levels ( assuming VPLUSD = 0V)
75 Ω differentially terminated (note 6)
4
• Logic “0” voltage VOL -1.41 -1.34 V
• Logic “1” voltage VOH -1.07 -1 V
Output levels ( assuming VPLUSD = 0V)
50 Ω differentially terminated (note 6)
• Logic “0” voltage VOL 1, 2
6
-1.40
-1.40
-1.32
-1.25
V
V
• Logic “1” voltage VOH 1, 2
6
-1.16
-1.25
-1.10
-1.10
V
V
Differential Output Swing DOS 4270 300 mV
Output level drift with temperature 41.6 mV/°C
DC ACCURACY
Single ended or differential input mode, 50 % clock duty cycle (CLK,CLKB), Binary output data format,
Tj (typical) = 70°C.
Differential non linearity (notes 2,3) DNL- 1, 2
6
-0.5
-0.6
-0.25
-0.35
LSB
LSB
DNL+ 1, 2
6
0.3
0.4
0.6
0.7
LSB
LSB
Integral non linearity (notes 2,3) INL- 1, 2
6
-1.0
-1.2
0.7
0.9
LSB
LSB
INL+ 1, 2
6
0.7
0.9
1.0
1.2
LSB
LSB
No missing codes (note 3) Guaranteed over specified temperature range
Gain error 1, 2
6
-10
-11
-2
-2
10
11
% FS
% FS
Input offset voltage 1, 2
6
-26
-30
-5
-5
26
30
mV
mV
Gain error drift
Offset error drift
4
4
100
40
125
50
150
60
ppm/°C
ppm/°C
7
Product Specification
TS8388BFS
Parameter Symb Test
level
Min Typ Max Unit
TRANSIENT PERFORMANCE
Bit Error Rate (notes 2, 4)
FS = 1 Gsps Fin = 62.5 MHz
BER 41E-12 Error/
sample
ADC settling time (note 2)
VIn -VinB = 400 mVpp
TS 40.5 1ns
Overvoltage recovery time (note 2) TOR 40.5 1ns
AC PERFORMANCE
Single ended or differential input and clock mode, 50 % clock duty cycle (CLK,CLKB), Binary output data format,
Tj. = 70°C, unless otherwise specified.
Signal to Noise and Distortion ratio (note 2) SINAD
FS = 1 Gsps Fin = 20 MHz 442 44 dB
FS = 1 Gsps Fin = 500 MHz 441 43 dB
FS = 1 Gsps Fin = 1000 MHz (-1dB Fs) 438 40 dB
FS = 50 Msps Fin = 25 MHz 1, 2, 6 40 44 dB
Effective Number Of bits ENOB
FS = 1 Gsps Fin = 20 MHz 47.0 7.2 Bits
FS = 1 Gsps Fin = 500 MHz 46.6 6.8 Bits
FS = 1 Gsps Fin = 1000 MHz (-1dBFs) 46.2 6.4 Bits
FS = 50 Msps Fin = 25 MHz 1, 2, 6 7.0 7.2 Bits
Signal to Noise Ratio (note 2) SNR
FS = 1 Gsps Fin = 20 MHz 442 45 dB
FS = 1 Gsps Fin = 500 MHz 441 44 dB
FS = 1 Gsps Fin = 1000 MHz (-1dBFs) 441 44 dB
FS = 50 Msps Fin = 25 MHz 1, 2, 6 44 45 dB
Total Harmonic Distortion (note 2) THD
FS = 1 Gsps Fin = 20 MHz 450 54 dB
FS = 1 Gsps Fin = 500 MHz 446 50 dB
FS = 1 Gsps Fin = 1000 MHz (-1dBFs) 442 46 dB
FS = 50 Msps Fin = 25 MHz 1, 2, 6 46 51 dB
Spurious Free Dynamic Range (note 2) SFDR
FS = 1 Gsps Fin = 20 MHz 452 57 dBc
FS = 1 Gsps Fin = 500 MHz 447 52 dBc
FS = 1 Gsps Fin = 1000 MHz (-1dBFs) 442 47 dBc
FS = 1 Gsps Fin = 1000 MHz (-3dBFs) 445 50 dBc
FS = 50 Msps Fin = 25 MHz 1, 2, 6 40 54 dBc
Two-tone inter-modulation distortion (note 2) IMD 4
FIN1 = 489 MHz @ FS = 1 Gsps - 47 - 52 dBc
FIN2 = 490 MHz @ FS = 1 Gsps
8TS8388BFS
Product Specification
Parameter Symb Test
level
Min Typ Max Unit
SWITCHING PERFORMANCE AND CHARACTERISTICS – See Timing Diagrams Figure 1, Figure 2
Maximum clock frequency (Note 14) FS11.4 Gsps
Minimum clock frequency (Note 15) FS410 50 Msps
Minimum Clock pulse width (high) TC1 40.280 0.500 50 ns
Minimum Clock pulse width (low) TC2 40.350 0.500 50 ns
Aperture delay (Note 2) TA 4100 +250 400 ps
Aperture uncertainty (Notes 2, 5) Jitter 40.4 0.6 ps (rms)
Data output delay (Notes 2, 10, 11, 12) TOD 41150 1360 1660 ps
Output rise/fall time for DATA (20 % – 80 %)
(note 11)
TR/TF 4250 350 550 ps
Output rise/fall time for DATA READY
(20 % – 80 % ) (note 11)
TR/TF 4250 350 550 ps
Data ready output delay (Notes 2,10, 11, 12) TDR 41110 1320 1620 ps
Data ready reset delay TRDR 4720 1000 ps
Data to data ready – clock low pulse width
(See timing diagram, notes 9, 13,14)
TOD-
TDR
4 0 40 80 ps
Data to data ready output delay (50% duty cycle)
(See timing diagram, notes 2, 15) @ 1Gsps
TD1 4420 460 500 ps
Data pipeline delay TPD 4 4 clock
cycles
Note 1 : Differential output buffers are internally loaded by 75 Ω resistors. Buffer bias current = 11 mA.
Note 2 : See definition of terms
Note 3 : Histogram testing based on sampling of a 10 MHz sinewave at 50 MSPS.
Note 4 : Output error amplitude < ± 4 LSB around worst code.
Note 5 : Maximum jitter value obtained for single–ended clock input on the JTS8388B die (chip on board) : 200 fs.
(500 fs expected on TS8388BG)
Note 6 : Digital output back termination options depicted in Application Notes figures 3,4,5 .
Note 7 : With a typical value of TD = 465 ps, at 1 Gsps, the timing safety margin for the data storing using the ECLinPS 10E452 output
registers from Motorola is of ± 315 ps, equally shared before and after the rising edge of the Data Ready signals (DR, DRB).
Note 8 : The clock inputs may be indifferently entered in differential or single–ended, using ECL levels or 4 dBm typical power level into the
50 Ω termination resistor of the inphase clock input.
(4 dBm into 50 Ω clock input correspond to 10 dBm power level for the clock generator.)
Note 9 : At 1GSPS, 50/50 clock duty cycle, TC2 = 500 ps (TC1). TDR - TOD = -100 ps (typ) does not depend on the sampling rate.
Note 10 : Specified loading conditions for digital outputs :
- 50 Ω or 75 Ω controlled impedance traces properly 50 / 75 Ω terminated, or unterminated 75 Ω controlled impedance traces.
- Controlled impedance traces far end loaded by 1 standard ECLinPS register from Motorola.( e.g. : 10E452 ) ( Typical input parasitic
capacitance of 1.5 pF including package and ESD protections. )
Note 11 : Termination load parasitic capacitance derating values :
- 50 Ω or 75 Ω controlled impedance traces properly 50 / 75 Ω terminated : 60 ps / pF or 75 ps per additionnal ECLinPS load.
- Unterminated ( source terminated ) 75 Ω controlled impedance lines : 100 ps / pF or 150 ps per additionnal ECLinPS termination
load.
Note 12 : apply proper 50 / 75 Ω impedance traces propagation time derating values : 6 ps / mm (155 ps/inch) for TSEV8388BFS Evaluation
Board.
Note 13 : Values for TOD and TDR track each other over temperature, ( 1 % variation for TOD - TDR per 100 oC. temperature variation ).
Therefore TOD - TDR variation over temperature is negligible. Moreover, the internal ( onchip ) and package skews between each
Data TODs and TDR effect can be considered as negligible.Consequently, minimum values for TOD and TDR are never more than
100 ps apart. The same is true for the TOD and TDR maximum values (see Advanced Application Notes about TOD - TDR variation
over temperature in section 7).
Note 14 : Min value guaranties performance. Max value guaranties functionality.
Note 15 : Min value guaranties functionality. Max value guaranties performance.
9
Product Specification
TS8388BFS
3.4. TIMING DIAGRAMS
TC1 TC2
TA= 250 ps
X
X
N+1
XN+2
XN+3
N
Figure 1 : TS8388BFS TIMING DIAGRAM ( 1 GSPS CLOCK RATE )
Data Ready Reset , Clock held at LOW level
DIGITAL
OUTPUTS
(VIN, VINB )
Data Ready
(DR, DRB)
(CLK, CLKB)
1. N+5
TD1=TC1+TDR-TOD
= TC1-40 ps = 460 ps
ps
DATA
N-4
DATA
N-3 DATA N
DATA
N
-1
DATA
N-2
TC=1000 ps
XX
N+4
TOD = 1360 ps
1360 ps
DRRB
1ns (min)
TDR = 1320 ps
TPD: 4.0 Clock periods
1000 ps
TRDR = 720 ps
N-1
TD2 = TC2+TOD-TDR
= TC2+40ps = 540 ps
TDR = 1320 ps
DATA
N-5
DATA
N+1
TC1 TC2
TA= 250ps
X3.
N+1
XN+2
XN+3
N
Figure 2 : TS8388BFS TIMING DIAGRAM ( 1 GSPS CLOCK RATE )
Data Ready Reset , Clock held at HIGH level
DIGITAL
OUTPUTS
(VIN, VINB )
Data Ready
(DR, DRB)
(CLK, CLKB)
2. N+5
TD1=TC1+TDR-TOD
= TC1-40 ps = 460 ps
DATA
N-4 DATA
N-3 DATA N
DATA
N-1
DATA
N-2
TC = 1000 ps
XX
N+4
TOD = 1360 ps
1360 ps
DRRB 1ns (min)
TDR = 1320 ps
TPD: 4.0 Clock periods
1000 ps
TRDR = 720ps
N-1
TD2 = TC2+TOD-TDR
= TC2+40ps = 540 ps
TDR = 1120 ps
DATA
N-5
DATA
N+1
10 TS8388BFS
Product Specification
3.5. EXPLANATION OF TEST LEVELS
1100% production tested at +25°C (1) (for “C” Temperature range (2) ).
2100 % production tested at +25°C (1), and sample tested at specified temperatures (for “V” and “M” Temperature ranges (2) ).
3Sample tested only at specified temperatures
4Parameter is guaranteed by design and characterization testing (thermal steady-state conditions at specified temperature).
5Parameter is a typical value only
6100 % production tested over specified temperature range (for “B/Q” Temperature range (2) ).
Only MIN and MAX values are guaranteed (typical values are issuing from characterization results).
(1) Unless otherwise specified, all tests are pulsed tests : therefore Tj = Tc = Ta,
where Tj ,Tc and Ta are junction, case and ambient temperature respectively.
(2) Refer to ORDERING INFORMATION chapter.
3.6. FUNCTIONS DESCRIPTION
Name Function
VCC Positive power supply
VEE Analog negative power supply
VPLUSD Digital positive power supply
GND Ground
VIN, VINB Differential analog inputs
CLK, CLKB Differential clock inputs
<D0:D7>
<D0B:D7B>
Differential output data port
DR ; DRB Differential data ready outputs
OR ; ORB Out of range outputs
GAIN ADC gain adjust
GORB Gray or Binary digital output select
DIOD/DRRB Die junction temp. measurement/
asynchronous data ready reset
3.7. DIGITAL OUTPUT CODING
NRZ (Non Return to Zero) mode, ideal coding : does not include gain, offset, and linearity voltage errors.
Differential
analog input
Voltage level Digital output Out of
Range
Binary
GORB = VCC or floating
Gray
GORB = GND
> +251 mV > Positive full scale + 1/2 LSB 11111111 10000000 1
+251 mV
+249 mV
Positive full scale + 1/2 LSB
Positive full scale – 1/2 LSB
11111111
11111110
10000000
10000001
0
0
+126 mV
+124 mV
Positive 1/2 scale + 1/2 LSB
Positive1/2 scale – 1/2 LSB
11000000
10111111
10100000
11100000
0
0
+1 mV
-1 mV
Bipolar zero + 1/2 LSB
Bipolar zero - 1/2 LSB
10000000
01111111
11000000
01000000
0
0
-124 mV
-126 mV
Negative 1/2 scale + 1/2 LSB
Negative 1/2 scale - 1/2 LSB
01000000
00111111
01100000
00100000
0
0
-249 mV
-251 mV
Negative full scale + 1/2 LSB
Negative full scale - 1/2 LSB
00000001
00000000
00000001
00000000
0
0
< -251 mV < Negative full scale - 1/2 LSB 00000000 00000000 1
VPLUSD = +0 V (ECL)
VPLUSD=+2.4V (LVDS)
VIN
VINB
CLK
CLKB
D0 → D7
D0B → D7B
DR
16
VEE=-5V
VCC = +5 V
TS8388BFS
ORB
GND
GORB
GAIN
OR
DVEE=-5V
DIOD/
DRRB
DRB
11
Product Specification
TS8388BFS
4. PACKAGE DESCRIPTION.
4.1. TS8388BFS PIN DESCRIPTION
Symbol Pin number Function
GND 5, 13, 27, 28, 34, 35, 36, 41, 42,
43, 50, 51, 52, 53, 58, 59
Ground pins.
To be connected to external ground plane.
VPLUSD 1, 2, 16, 17, 18, 68 Digital positive supply. (0V for ECL compatibility, +2.4V for LVDS
compatibility). (note 2)
VCC 26, 29, 32, 33, 46, 47, 61 +5 V positive supply.
VEE 30, 31, 44, 45, 48 -5 V analog negative supply.
DVEE 8, 9, 10 -5 V digital negative supply.
VIN 54(1), 55 In phase (+) analog input signal of the Sample and Hold
differential preamplifier.
VINB 56, 57(1) Inverted phase (-) of analog input signal (VIN).
CLK 37(1), 38 In phase (+) ECL clock input signal. The analog input is sampled
and held on the rising edge of the CLK signal.
CLKB 39, 40(1) Inverted phase (-) of ECL clock input signal (CLK).
D0, D1, D2, D3, D4, D5, D6,
D7
23, 21, 19, 14, 6, 3, 66, 64 In phase (+) digital outputs.
B0 is the LSB. B7 is the MSB.
D0B, D1B, D2B, D3B, D4B,
D5B, D6B, D7B
24, 22, 20, 15, 7, 4, 67, 65 Inverted phase (-) Digital outputs.
B0B is the inverted LSB. B7B is the inverted MSB.
OR 62 In phase (+) Out of Range Bit.
Out of Range is high on the leading edge of code 0 and code 256.
ORB 63 Inverted phase (+) of Out of Range Bit (OR).
DR 11 In phase (+) output of Data Ready Signal.
DRB 12 Inverted phase (-) output of Data Ready Signal (DR).
GORB 25 Gray or Binary select output format control pin.
– Binary output format if GORB is floating or VCC.
– Gray output format if GORB is connected at ground (0 V).
GAIN 60 ADC gain adjust pin.
DIOD/DRRB 49 This pin has a double function (can be left open or grounded if not
used) :
DIOD : die junction temperature monitoring pin.
DRRB : asynchronous data ready reset function
Note 1 : Following pin numbers 37 (CLK), 40 (CLKB), 54 (VIN) and 57 (VINB) have to be connected to GND through a 50 Ω resistor as close
as possible to the package.(50 Ω termination preferred option).
Note 2 : The common mode level of the output buffers is 1.2V below the positive digital supply.
For ECL compatibility the positive digital supply must be set at 0V (ground ).
For LVDS compatibility (output common mode at +1.2V) the positive digital supply must be set at 2.4V.
If the subsequent LVDS circuitry can withstand a lower level for input common mode, it is recommended to lower the positive digital
supply level in the same proportion in order to spare power dissipation.
12 TS8388BFS
Product Specification
4.2. TS8388BFS PINOUT
TS8388BFS
VPLUSD
VPLUSD
VPLUSD
VPLUSD
V
PLUSD
V
PLUSD
D2
D2B
D1
D1B
D0
D0B
D3B
D3
DRB
DR
D4B
D4
D5B
D5
D6B
D6
D7B
D7
ORB
OR
TOP VIEW :
13
Product Specification
TS8388BFS
4.3. OUTLINE DIMENSIONS – 68 PINS CQFP
1.133 – 1.147
28,78 – 29.13
.950 ± .006
24.13 ± 0.152
0.8 BCS
20.32 BSC
0.050 BCS
1.27 BSC
.950 ± .006
24.13 ± 0.152
1.133 – 1.147
28.78 – 29.13
.023 ± .002
0.58 ± 0.05
Pin No 1 index
Ø .005 Z X Y
M
.
CQFP 68
68 pins Ceramic Quad Flat Pack
.007 ± .005
0.18 ± 0.13
.005 – .010
0.13 – 0.25
0o – 8o
.027 – .037
0.70 – 0.95
.0310
0.787
.0385
0.978
.020 ± .005
0.51 ± 0.13
14 TS8388BFS
Product Specification
4.4. THERMAL CHARACTERISTICS
4.4.1. ENHANCED CQFP
The CQFP68 has been modified, in order to improve the thermal characteristics :
A CuW heatspreader has been added at the bottom of the package.
The die has been electrically isolated with the ALN substrate.
4.4.2. THERMAL RESISTANCE FROM JUNCTION TO AMBIENT : RTHJA
The following table lists the convector thermal performances parameters of the device itself, with no external heatsink added.
4.4.3. THERMAL RESISTANCE FROM JUNCTION TO CASE : RTHJC
Typical value for Rthjc is given to 1.56 oC/W.
This value does not include thermal contact resistance between package and external component (heatsink or PCBoard).
As an example, 2.0 oC/W can be taken for 50 m of thermal grease.
4.4.4. HEATSINK
It is recommended to use an external heatsink, or PCBoard special design.
The stand off has been calculated to permit the simultaneous soldering of the leads and of the heatspreader with the solder paste.
Suggested assembly :
24.13
28.78


Printed circuit board
CuW heatspreader


Thermal via Solid ground plane
Cooling system efficiency can be monitored using the Temperature Sensing Diode, integrated in the device.
15
Product Specification
TS8388BFS
5. TYPICAL CHARACTERIZATION RESULTS
5.1. STATIC LINEARITY – FS = 50 MSPS / FIN = 10 MHZ
5.1.1. INTEGRAL NON LINEARITY
5.1.2. DIFFERENTIAL NON LINEARITY
LSB
INL = +/- 0.7 LSB
code
Signal Frequency = 10MHzClock Frequency = 50Msps
Positive peak : 0.78 LSB Negative peak : -0.73 LSB
LSB
DNL = +/- 0.4 LSB
code
Signal Frequency = 10MHzClock Frequency = 50Msps
Positive peak : 0.3 LSB Negative peak : -0.39 LSB
16 TS8388BFS
Product Specification
5.2. EFFECTIVE NUMBER OF BITS VERSUS POWER SUPPLIES VARIATION
0
1
2
3
4
5
6
7
8
-7 -6,5 -6 -5,5 -5 -4,5 -4
Effective number of bits = f
(
VEEA
)
; Fs = 500 MSPS ; Fin = 100 MHz
VEEA (V)
ENOB (bits)
0
1
2
3
4
5
6
7
8
3 3,5 4 4,5 5 5,5 6 6,5 7
Effective number of bits = f
VCC
; Fs = 500 MSPS ; Fin = 100 MHz
VCC (V)
ENOB (bits)
0
1
2
3
4
5
6
7
8
-6 -5,5 -5 -4,5 -4 -3,5 -3
Effective number of bits = f
(
VEED
)
; Fs = 500 MSPS ; Fin = 100 MHz
VEED
(
V
)
ENOB (bits)
17
Product Specification
TS8388BFS
5.3. TYPICAL FFT RESULTS
5.3.1 FS = 1 GSPS, FIN=20 MHZ
5.3.2. FS = 1 GSPS, FIN = 495 MHZ
5.3.3. FS = 1 GSPS, FIN = 995 MHZ ( -3DB FULL SCALE INPUT)
Single Ended or
differential
Fs =1 GSPS
Fin = 20 MHz
Eff. Bits =7.2
SINAD = 44.3 dB
SNR = 44.7dB
THD = -54dBc
SFDR = -57 dBc
H3H2
clock duty cycle = 50 %
Binary output coding
H11
H12
Single Ended or
differential
Fs =1 GSPS
Fin=495MHz
Eff. Bits =6.8
SINAD =43 dB
SNR = 44.1 dB
THD = -50 dBc
SFDR= -52 dBc
clock duty cycle = 50 %
H3
H11
H14
H12
Binary output coding
H2
Single Ended or
differential
Fs =1 GSPS
Fin=995 MHz
Eff. Bits =6.6
SINAD =40.8 dB
SNR = 44 dB
THD = -48 dBc
SFDR= -50 dBc
clock duty cycle = 50 %
H2
H3
Binary output coding
H10
18 TS8388BFS
Product Specification
5.4. SPURIOUS FREE DYNAMIC RANGE VERSUS INPUT AMPLITUDE
5.4.1. SAMPLING FREQUENCY FS=1 GSPS ; INPUT FREQUENCY FIN=995 MHZ ; GRAY OR BINARY OUTPUT CODING
Fs = 1 GSPS Fin = 995 MHz Full Scale
ENOB
=
64
SINAD
=
40 dB
SNR
=
44dB
THD
=-
46 dBc
SFDR
=-
47 dBc
Full Scale
magnitude (code)
SFDR = -47 dBc
H2
H3
19
Product Specification
TS8388BFS
-3dB Full Scale
Fs = 1 GSPS Fin = 995 MHz (-3 dB Full Scale)
ENOB = 6.6 SINAD = 40.8 dB SNR = 44dB SFDR = -50dBc
magnitude (code)
THD = -48dBc
SFDR = -50 dBc
H2
H3
20 TS8388BFS
Product Specification
5.5. DYNAMIC PERFORMANCE VERSUS ANALOG INPUT FREQUENCY
Fs=1 Gsps, Fin = 0 up to 1600 MHz, Full Scale input (FS), FS -3 dB
Clock duty cycle 50 / 50, Binary/Gray output coding, fully differential or single-ended analog and clock inputs
3
4
5
6
7
8
0 200 400 600 800 1000 1200 1400 1600 1800
Input frequency (MHz)
ENOB (dB)
-3 dB FS
FS
30
32
34
36
38
40
42
44
46
48
50
0 200 400 600 800 1000 1200 1400 1600 1800
Input frequency (MHz)
SNR (dB)
FS
-3 dB FS
-60
-55
-50
-45
-40
-35
-30
-25
-20
0 200 400 600 800 1000 1200 1400 1600 1800
Input frequency (MHz)
SFDR (dBc)
-3 dB FS
FS
21
Product Specification
TS8388BFS
5.6. EFFECTIVE NUMBER OF BITS (ENOB) VERSUS SAMPLING FREQUENCY
Analog Input Frequency : Fin = 495 MHz and Nyquist conditions ( Fin = Fs / 2 )
Clock duty cycle 50 / 50 , Binary output coding
5.7. SFDR VERSUS SAMPLING FREQUENCY
Analog Input Frequency : Fin = 495 MHz and Nyquist conditions ( Fin = Fs / 2 )
Clock duty cycle 50 / 50 , Binary output coding
2
3
4
5
6
7
8
0 200 400 600 800 1000 1200 1400 1600
Sampling frequency (Msps)
ENOB (dB)
Fin= FS/2
Fin=500 MHz
-60
-55
-50
-45
-40
-35
-30
-25
-20
0 200 400 600 800 1000 1200 1400 1600
Sampling frequency (Msps)
SFDR (dBc)
Fin= FS/2
Fin=500 MHz
22 TS8388BFS
Product Specification
5.8. TS8388BFS ADC PERFORMANCES VERSUS JUNCTION TEMPERATURE
3
4
5
6
7
8
-40 -20 0 20 40 60 80 100 120 140 160
Effective number of bits versus junction temperature
Fs = 1 GSPS ; Fin = 500 MHz ; Duty cycle = 50%
Temperature ( oC)
ENOB (bits)
42
43
44
45
46
-60 -40 -20 0 20 40 60 80 100 120
Signal to noise ratio versus junction temperature
Fs = 1 GSPS ; Fin = 507 MHz ; Differential clock, Single-ended analog input (Vin=-1dBFs)
Temperature ( oC)
SNR (dB)
43
45
47
49
51
53
-60 -40 -20 0 20 40 60 80 100 120
Total harmonic distorsion versus junction temperature
Fs = 1 GSPS ; Fin = 507 MHz ; Differential clock, Single-ended analog input (Vin=-1dBFs)
Temperature ( oC)
THD (dB)
23
Product Specification
TS8388BFS
5.9. TYPICAL FULL POWER INPUT BANDWIDTH
1.5 GHz at -3 dB (-2dBm full power input)
0
1
2
3
4
5
-40 -20 0 20 40 60 80 100 120 140 160
Power consumption versus junction temperature
Fs = 1 G SPS ; Fin = 500 MHz ; Duty cycle = 50%
Tem perature (
oC)
Power consumption (W
-6
-5
-4
-3
-2
-1
0
100 300 500 700 900 1100 1300 1500 1700
Frequency (MHz)
Magnitude (dB)
24 TS8388BFS
Product Specification
5.10. ADC STEP RESPONSE
Test pulse input characteristics : 20% to 80% input full scale and rise time ~ 200ps.
Note : This step response was obtained with the TSEV8388B chip on board (device in die form).
5.10.1. TEST PULSE DIGITIZED WITH 20 GHZ DSO
5.10.2. SAME TEST PULSE DIGITIZED WITH TS8388BFS ADC
N.B. : ripples are due to the test setup (they are present on both measurements)
50 mV/div
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.00
time (ns)
Vpp ~ 260 mV
Tr ~ 240 ps
50 mV/div
500 ps/div
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.00
200
150
100
50
0
ADC code
time (ns)
Tr ~ 280 ps
50 codes/div (Vpp ~260 mV)
500 ps/div
ADC calculated rise time : between 150 and 200
p
s.
25
Product Specification
TS8388BFS
6. DEFINITION OF TERMS
(BER) Bit Error Rate Probability to exceed a specified error threshold for a sample. An error code is a code that differs
by more than +/- 4 LSB from the correct code.
(BW) Full power input
bandwidth
Analog input frequency at which the fundamental component in the digitally reconstructed output
has fallen by 3 Db with respect to its low frequency value (determined by FFT analysis) for input
at Full Scale.
(SINAD) Signal to noise and
distortion ratio
Ratio expressed in Db of the RMS signal amplitude, set to 1Db below Full Scale, to the RMS
sum of all other spectral components, including the harmonics except DC.
(SNR) Signal to noise ratio Ratio expressed in Db of the RMS signal amplitude, set to 1Db below Full Scale, to the RMS
sum of all other spectral components excluding the five first harmonics.
(THD) Total harmonic
distorsion
Ratio expressed in dBc of the RMS sum of the first five harmonic components, to the RMS value
of the measured fundamental spectral component.
(SFDR) Spurious free dynamic
range
Ratio expressed in Db of the RMS signal amplitude, set at 1Db below Full Scale, to the RMS
value of the next highest spectral component (peak spurious spectral component). SFDR is the
key parameter for selecting a converter to be used in a frequency domain application ( Radar
systems, digital receiver, network analyzer ….). It may be reported in dBc (i.e., degrades as
signal levels is lowered), or in Dbfs (i.e. always related back to converter full scale).
(ENOB) Effective Number Of Bits Where A is the actual input amplitude and V
is the full scale range of the ADC under test
(DNL) Differential non
linearity
The Differential Non Linearity for an output code i is the difference between the measured step
size of code i and the ideal LSB step size. DNL (i) is expressed in LSBs. DNL is the maximum
value of all DNL (i). DNL error specification of less than 1 LSB guarantees that there are no
missing output codes and that the transfer function is monotonic.
(INL) Integral non linearity The Integral Non Linearity for an output code i is the difference between the measured input
voltage at which the transition occurs and the ideal value of this transition.
INL (i) is expressed in LSBs, and is the maximum value of all |INL (i)|.
(DG) Differential gain The peak gain variation (in percent) at five different DC levels for an AC signal of 20% Full
Scale peak to peak amplitude. FIN = 5 MHz. (TBC)
(DP) Differential phase Peak Phase variation (in degrees) at five different DC levels for an AC signal of 20% Full Scale
peak to peak amplitude. FIN = 5 MHz. (TBC)
(TA) Aperture delay Delay between the rising edge of the differential clock inputs (CLK,CLKB) (zero crossing point),
and the time at which (VIN,VINB) is sampled.
(JITTER) Aperture uncertainty Sample to sample variation in aperture delay. The voltage error due to jitter depends on the slew
rate of the signal at the sampling point.
(TS) Settling time Time delay to achieve 0.2 % accuracy at the converter output when a 80% Full Scale step
function is applied to the differential analog input.
(ORT) Overvoltage recovery
time
Time to recover 0.2 % accuracy at the output, after a 150 % full scale step applied on the input is
reduced to midscale.
(TOD) Digital data
Output delay
Delay from the falling edge of the differential clock inputs (CLK,CLKB) (zero crossing point) to
the next point of change in the differential output data (zero crossing) with specified load.
(TD1) Time delay from Data to
Data Ready
Time delay from Data transition to Data ready.
(TD2) Time delay from Data
Ready to Data
General expression is TD1 = TC1 + TDR – TOD with TC = TC1 + TC2 = 1 encoding clock
period.
(TC) Encoding clock period TC1 = Minimum clock pulse width (high) TC = TC1 + TC2
TC2 = Minimum clock pulse width (low)
(TPD) Pipeline Delay Number of clock cycles between the sampling edge of an input data and the associated output
data being made available, (not taking in account the TOD). For the TS8388BFS the TPD is 4
clock periods.
(TRDR) Data Ready reset delay Delay between the falling edge of the Data Ready output asynchronous Reset signal (DDRB)
and the reset to digital zero transition of the Data Ready output signal (DR).
(TR) Rise time Time delay for the output DATA signals to rize from 20% to 80% of delta between low level and
SINAD - 1.76 + 20 log (A/V/2)
ENOB = 
6.02
26 TS8388BFS
Product Specification
high level.
(TF) Fall time Time delay for the output DATA signals to fall from 80% to 20% of delta between low level and
high level.
(PSRR) Power supply
rejection ratio
Ratio of input offset variation to a change in power supply voltage.
(NRZ) Non return to zero When the input signal is larger than the upper bound of the ADC input range, the output code is
identical to the maximum code and the Out of Range bit is set to logic one. When the input
signal is smaller than the lower bound of the ADC input range, the output code is identical to the
minimum code, and the Out of range bit is set to logic one. (It is assumed that the input signal
amplitude remains within the absolute maximum ratings).
(IMD) InterModulation Distortion The two tones intermodulation distortion ( IMD ) rejection is the ratio of either input tone to the
worst third order intermodulation products. The input tones levels are at – 7Db Full Scale.
(NPR) Noise Power Ratio The NPR is measured to characterize the ADC performance in response to broad bandwidth
signals. When using a notch-filtered broadband white-noise generator as the input to the ADC
under test, the Noise Power Ratio is defined as the ratio of the average out-of-notch to the
average in-notch power spectral density magnitudes for the FFT spectrum of the ADC output
sample test.
27
Product Specification
TS8388BFS
7. TS8388BFS MAIN FEATURES
7.1. TIMING INFORMATIONS
7.1.1. TIMING VALUE FOR TS8388BFS
Timing values as defined in 3.3 are advanced data, issuing from electric simulations and first characterizations results fitted with measurements.
Timing values are given at CQFP68 package inputs/outputs, taking into account package internal controlled impedance traces propagation
delays, gullwing pin model, and specified termination loads.
Propagation delays in 50/75 ohms impedance traces are NOT taken into account for TOD and TDR.
Apply proper derating values corresponding to termination topology.
The min/max timing values are valid over the full temperature range in the following conditions :
Note 1 : Specified Termination Load (Differential output Data and Data Ready) :
50 ohms resistor in parallel with 1 standard ECLinPS register from Motorola, (e.g : 10E452)
(Typical ECLinPS inputs shows a typical input capacitance of 1.5 pF (including package and ESD protections)
If addressing an output Dmux, take care if some Digital outputs do not have the same termination load and apply corresponding derating value
given below.
Note 2 : Output Termination Load derating values for TOD and TDR :
~ 35 ps/pF or 50 ps per additional ECLinPS load.
Note 3 :Propagation time delay derating values have also to be applied for TOD and TDR :
~ 6 ps/mm (155 ps/inch) for TSEV8388B Evaluation Board.
Apply proper time delay derating value if a different dielectric layer is used.
7.1.2. PROPAGATION TIME CONSIDERATIONS
TOD and TDR Timing values are given from pin to pin and DO NOT include the additional propagation times between device pins and
input/output termination loads. For the TSEV8388B Evaluation Board, the propagation time delay is 6ps/mm (155ps/inch) corresponding to 3.4
(@10GHz) dielectric constant of the RO4003 used for the Board.
If a different dielectric layer is used (for instance Teflon), please use appropriate propagation time values.
TD does NOT depend on propagation times because it is a differential data.
(TD is the time difference between Data Ready output delay and digital Data output delay)
TD is also the most straightforward data to measure, again because it is differential :
TD can be measured directly onto termination loads, with matched Oscilloscopes probes.
7.1.3. TOD - TDR VARIATION OVER TEMPERATURE
Values for TOD and TDR track each other over temperature (1 percent variation for TOD - TDR per 100 degrees Celsius temperature variation).
Therefore TOD - TDR variation over temperature is negligible. Moreover, the internal (onchip) and package skews between each Data TODs
and TDR effect can be considered as negligible.
Consequently, minimum values for TOD and TDR are never more than 100 ps apart. The same is true for the TOD and TDR maximum values.
In other terms :
If TOD is at 1150 ps, TDR will not be at 1620 ps ( maximum time delay for TDR ).
If TOD is at 1660 ps, TDR will not be at 1110 ps ( minimum time delay for TDR ) However, external TOD - TDR values may be dictated by total
digital datas skews between every TODs (each digital data) and TDR :
MCM Board , bonding wires and output lines lengths differences, and output termination impedance mismatches.
The external (on board) skew effect has NOT been taken into account for the specification of the minimum and maximum values for TOD-TDR.
7.1.4. PRINCIPLE OF OPERATION
The Analog input is sampled on the rising edge of external clock input (CLK,CLKB) after TA (aperture delay) of typically 250ps .
The digitized data is available after 4 clock periods latency (pipeline delay (TPD)), on clock rising edge, after 1360 ps typical propagation delay
TOD.
The Data Ready differential output signal frequency (DR,DRB) is half the external clock frequency, that is it switches at the same rate as the
digital outputs.
The Data Ready output signal (DR,DRB) switches on external clock falling edge after a propagation delay TDR of typically 1320 ps.
A Master Asynchronous Reset input command DRRB ( ECL compatible single-ended input) is available for initializing the differential Data
Ready output signal ( DR,DRB ) .This feature is mandatory in certain applications using interleaved ADCs or using a single ADC with
demultiplexed outputs. Actually, without Data Ready signal initialization, it is impossible to store the output digital datas in a defined order.
28 TS8388BFS
Product Specification
7.2. PRINCIPLE OF DATA READY SIGNAL CONTROL BY DRRB INPUT COMMAND
7.2.1. DATA READY OUTPUT SIGNAL RESET
The Data Ready signal is reset on falling edge of DRRB input command, on ECL logical low level (-1.8V). DRRB may also be tied to VEE = - 5V
for Data Ready output signal Master Reset. So long DRRB remains at logical low level, (or tied to VEE = - 5V), the Data Ready output remains
at logical zero and is independant of the external free running encoding clock.
The Data Ready output signal (DR,DRB) is reset to logical zero after TRDR= 920 ps typical.
TRDR is measured between the -1.3V point of the falling edge of DRRB input command and the zero crossing point of the differential Data
Ready output signal (DR,DRB).
The Data Ready Reset command may be a pulse of 1 ns minimum time width.
7.2.2. DATA READY OUTPUT SIGNAL RESTART
The Data Ready output signal restarts on DRRB command rising edge, ECL logical high levels (-0.8V).
DRRB may also be Grounded, or is allowed to float, for normal free running Data Ready output signal.
The Data Ready signal restart sequence depends on the logical level of the external encoding clock, at DRRB rising edge instant :
1) The DRRB rising edge occurs when external encoding clock input (CLK,CLKB) is LOW :
The Data Ready output first rising edge occurs after half a clock period on the clock falling edge, after a delay time TDR = 1320 ps already
defined hereabove.
2) The DRRB rising edge occurs when external encoding clock input (CLK,CLKB) is HIGH :
The Data Ready output first rising edge occurs after one clock period on the clock falling edge, and a delay TDR = 1320ps.
Consequently, as the analog input is sampled on clock rising edge, the first digitized data corresponding to the first acquisition ( N ) after Data
Ready signal restart ( rising edge ) is always strobed by the third rising edge of the data ready signal.
The time delay (TD1) is specified between the last point of a change in the differential output data (zero crossing point) to the rising or falling
edge of the differential Data Ready signal (DR,DRB) (zero crossing point).
Note 1 : For normal initialization of Data Ready output signal, the external encoding clock signal frequency and level must be controlled.
It is reminded that the minimum encoding clock sampling rate for the ADC is 10 MSPS and consequently the clock cannot be stopped.
Note 2 : One single pin is used for both DRRB input command and die junction temperature monitoring.
Pin denomination will be DRRB/DIOD.( On former version denomination was DIOD. )
Temperature monitoring and Data Ready control by DRRB is not possible simultaneously.
7.3. ANALOG INPUTS (VIN) (VINB)
The analog input Full Scale range is 0.5 Volts peak to peak (Vpp), or -2 dBm into the 50 ohms termination resistor.
In differential mode input configuration, that means 0.25 Volt on each input, or +/- 125 mV around zero volt. The input common mode is
GROUND.
The typical input capacitance is 3 pF for TS8388B in CQFP package.
The input capacitance is mainly due to the package.(note : the ESD protections are not connected(but present) on the inputs.
Differential inputs voltage span
-125
125
[mV]
-250 mV250 mV
VIN
500mV
Full Scale
analog input
t
VINB
(VIN,VINB) = +/- 250 mV = 500 mV diff
0 Volt
Differential versus single ended analog input operation
The TS8388BFS can operate at full speed in either differential or single ended configuration.
This is explained by the fact the ADC uses a high input impedance differential preamplifier stage, (preceeding the Sample and hold stage),
which has been designed in order to be entered either in differential mode or single–ended mode.
29
Product Specification
TS8388BFS
This is true so long as the out of phase analog input pin VINB is 50 ohms terminated very closely to one of the neighboring shield ground pins
(52, 53, 58, 59) which constitute the local ground reference for the inphase analog input pin (VIN).
Thus the differential analog input preamplifier will fully reject the local ground noise ( and any capacitively and inductively coupled noise) as
common mode effects.
In typical single–ended configuration, enter on the (VIN) input pin, with the inverted phase input pin (VINB) grounded through the 50 ohms
termination resistor.
In single–ended input configuration, the in-phase input amplitude is 0.5 Volt peak to peak,centered on 0V. (or -2 dBm into 50 ohms.)
The inverted phase input is at ground potential through the 50 ohms termination resistor.
However, dynamic performances can be somewhat improved by entering either analog or clock inputs in differential mode.
Typical Single ended analog input configuration
VIN or VINB
VIN or VINB double pad (pins 54, 55 or 56, 57)
50 Ω
(external)
50 Ω reverse termination
1MΩ3 pF
-250
250
[mV]
500 mV
500 mV
Full Scale
analog input
t
VINB
VIN
VINB = 0V
VIN = +/- 250 mV ⇔ 500 mV diff
7.4. CLOCK INPUTS (CLK) (CLKB)
The TS8388BFS can be clocked at full speed without noticeable performance degradation in either differential or single ended configuration.
This is explained by the fact the ADC uses a differential preamplifier stage for the clock buffer, which has been designed in order to be entered
either in differential or single–ended mode.
Recommended sinewave generator characteristics are typically -120 dBc/Hz phase noise floor spectral density, @ 1 KHz from carrier ,
assuming a single tone 4 dBm input for the clock signal.
7.4.1. SINGLE ENDED CLOCK INPUT (GROUND COMMON MODE)
Although the clock inputs were intended to be driven differentially with nominal -0.8V / -1.8V ECL levels, the TS8388BFS clock buffer can
manage a single–ended sinewave clock signal centered around 0 Volt. This is the most convenient clock input configuration as it does not
require the use of a power splitter.
No performance degradation ( e.g. : due to timing jitter) is observed in this particular single–ended configuration up to 1.2GSPS Nyquist
conditions ( Fin = 600 MHz ).
This is true so long as the inverted phase clock input pin is 50 ohms terminated very closely to one of the neighbouring shield ground pin, which
constitutes the local Ground reference for the inphase clock input.
Thus the TS8388BFS differential clock input buffer will fully reject the local ground noise ( and any capacitively and inductively coupled noise) as
common mode effects.
Moreover, a very low phase noise sinewave generator must be used for enhanced jitter performance.
The typical inphase clock input amplitude is 1 Volt peak to peak, centered on 0 Volt (ground) common mode.
This corresponds to a typical clock input power level of 4 dBm into the 50 ohms termination resistor.
Do not exceed 10 dBm to avoid saturation of the preamplifier input transistors.
The inverted phase clock input is grounded through the 50 ohms termination resistor.
30 TS8388BFS
Product Specification
Single ended Clock input (Ground common mode)
VCLK common mode = 0 Volt
VCLKB=0 Volt
4 dBm typical clock input power level
(into 50 ohms termination resistor)
[V]
t
VCLK
VCLKB = ( 0 V )
-0.5V
+0.5V CLK or CLKB
50 Ω
(external)
50 Ω reverse termination
1MΩ0.4 pF
CLK or CLKB double pad (pins 37, 38 or 39, 40)
Note 1 : Do not exceed 10 dBm into the 50 ohms termination resistor for single clock input power level.
7.4.2. DIFFERENTIAL ECL CLOCK INPUT
The clock inputs can be driven differentially with nominal -0.8V / -1.8V ECL levels.
In this mode, a low phase noise sinewave generator can be used to drive the clock inputs, followed by a power splitter (hybrid junction) in order
to obtain 180 degrees out of phase sinewave signals. Biasing tees can be used for offseting the common mode voltage to ECL levels.
Note : As the biasing tees propagation times are not matching, a tunable delay line is required in order to ensure the signals to be 180 degrees
out of phase especially at fast clock rates in the GSPS range.
Differential Clock inputs (ECL Levels)
-0.8V
[mV]
t
-1.8V
VCLKB
VCLK
Common mode = -1.3 V
CLK or CLKB
50 Ω reverse termination
1MΩ0.4 pF
-2V
50 Ω
(external)
CLK or CLKB double pad (pins 37, 38 or 39, 40)
7.4.3. SINGLE ENDED ECL CLOCK INPUT
In single–ended configuration enter on CLK ( resp. CLKB ) pin , with the inverted phase Clock input pin CLKB (respectively CLK) connected to -
1.3V through the 50 ohms termination resistor.
The inphase input amplitude is 1 Volt peak to peak, centered on -1.3 Volt common mode.
Single ended Clock input (ECL):
VCLK common mode = -1.3 Volt.
VCLKB = -1.3 Volt
31
Product Specification
TS8388BFS
-0.8V
[V]
t
-1.8V
VCLK
VCLKB = -1.3 V
32 TS8388BFS
Product Specification
7.5. NOISE IMMUNITY INFORMATIONS
Circuit noise immunity performance begins at design level.
Efforts have been made on the design in order to make the device as insensitive as possible to chip environment perturbations resulting from
the circuit itself or induced by external circuitry.
(Cascode stages isolation, internal damping resistors, clamps, internal (onchip) decoupling capacitors.)
Furthermore, the fully differential operation from analog input up to the digital outputs provides enhanced noise immunity by common mode
noise rejection.
Common mode noise voltage induced on the differential analog and clock inputs will be canceled out by these balanced differential amplifiers.
Moreover, proper active signals shielding has been provided on the chip to reduce the amount of coupled noise on the active inputs :
The analog inputs and clock inputs of the TS8388BFS device have been surrounded by ground pins, which must be directly connected to the
external ground plane.
7.6. DIGITAL OUTPUTS
The TS8388BFS differential output buffers are internally 75 ohms loaded. The 75 ohms resistors are connected to the digital ground pins
through a -0.8v level shift diode (see Figures 3,4,5 on next page).
The TS8388BFS output buffers are designed for driving 75 ohms (default) or 50 ohms properly terminated impedance lines or coaxial cables.
An 11 mA bias current flowing alternately into one of the 75 ohms resistors when switching ensures a 0.825 V voltage drop across the resistor
(unterminated outputs).
The VPLUSD positive supply voltage allows the adjustment of the output common mode level from -1.2V (VPLUSD=0V for ECL output
compatibility) to +1.2V (VPLUSD=2.4V for LVDS output compatibility).
Therefore, the single ended output voltages vary approximately between -0.8V and -1.625V, ( outputs unterminated ), around -1.2V common
mode voltage.
Three possible line driving and back-termination scenarios are proposed (assuming VPLUSD=0V) :
1 ) 75 Ohms impedance transmission lines, 75 ohms differentially terminated (Fig. 3) :
Each output voltage varies between -1V and -1.42V (respectively +1.4V and +1V), leading to +/- 0.41V =0.825 V in differential, around -1.21 V
(respectively +1.21V) common mode for VPLUSD=0V (respectively 2.4V).
2 ) 50 ohms impedance transmission lines, 50 ohms differentially termination (Fig. 4) :
Each output voltage varies between -1.02V and -1.35V (respectively +1.38V and +1.05V), leading to +/- 0.33V=660 mV in differential, around -
1.18V (respectively +1.21V) common mode for VPLUSD=0V (respectively 2.4V).
3 ) 75 ohms impedance open transmission lines (Fig. 5) :
Each output voltage varies between -1.6 V and -0.8 V (respectively +0.8V and +1.6V), which are true ECL levels, leading to +/- 0.8V=1.6V in
differential, around -1.2V (respectively +1.2V) common mode for VPLUSD=0V (respectively 2.4V).
Therefore, it is possible to drive directly high input impedance storing registers, without terminating the 75 ohms transmission lines.
In time domain, that means that the incident wave will reflect at the 75 ohms transmission line output and travel back to the generator ( i.e. the
75 ohms data output buffer ). As the buffer output impedance is 75 ohms, no back reflection will occur.
Note : This is no longer true if a 50 ohms transmission line is used, as the latter is not matching the buffer 75 ohms output impedance.
Each differential output termination length must be kept identical .
It is recommended to decouple the midpoint of the differential termination with a 10 nF capacitor to avoid common mode perturbation in case of
slight mismatch in the differential output line lengths.
Too large mismatches ( keep < a few mm ) in the differential line lengths will lead to switching currents flowing into the decoupling capacitor
leading to switching ground noise.
The differential output voltage levels ( 75 or 50 ohms termination ) are not ECL standard voltage levels, however it is possible to drive standard
logic ECL circuitry like the ECLinPS logic line from MOTOROLA.
At sampling rates exceeding 1GSPS, it may be difficult to trigger the HP16500 or any other Acquisition System with digital outputs.
It becomes necessary to regenerate digital data and Data Ready by means of external amplifiers, in order to be able to test the TS8388BFS at
its optimum performance conditions.
33
Product Specification
TS8388BFS
7.6.1. DIFFERENTIAL OUTPUT LOADING CONFIGURATIONS (LEVELS FOR ECL COMPATIBILITY)
7.6.1. DIFFERENTIAL OUTPUT LOADING CONFIGURATIONS (LEVELS FOR LVDS COMPATIBILITY)
-+
11 mA
DVEE
VPLUSD = 0V
75 Ω75 Ω
75 Ω
75 Ω
impedance 10 nF
75 Ω
75 Ω
Out -1V / -1.41V
OutB -1.41V / -1V
Differential output :
± 0.41V = 0.825V
Common mode level : -1.2V
(-1.2V below VPLUSD level)
Figure 3 : DIFFERENTIAL OUTPUT : 75 Ω TERMINATED
-0.8V
-+
11 mA
DVEE
VPLUSD = 0V
75 Ω75 Ω
50 Ω
50 Ω
impedance 10 nF
50 Ω
50 Ω
Out -1.02V / -1.35V
OutB -1.35V / -1.02V
Differential output :
± 0.33V = 0.660V
Common mode level : -1.2V
(-1.2V below VPLUSD level)
Figure 4 : DIFFERENTIAL OUTPUT : 50 Ω TERMINATED
-0.8V
-+
11 mA
DVEE
VPLUSD = 0V
75 Ω75 Ω
75 Ω
75 Ω
impedance
Out -0.8V / -1.6V
OutB -1.6V / -0.8V
Differential output :
± 0.8V = 1.6V
Common mode level : -1.2V
(-1.2V below VPLUSD level)
Figure 5 : DIFFERENTIAL OUTPUT : OPEN LOADED
-0.8V
-+
11 mA
DVEE
VPLUSD = 2.4V
75 Ω75 Ω
75 Ω
75 Ω
impedance 10 nF
75 Ω
75 Ω
Out 1.4V / 0.99V
OutB 0.99V / 1.4V
Differential output :
± 0.41V = 0.825V
Common mode level : -1.2V
(-1.2V below VPLUSD level)
Figure 6 : DIFFERENTIAL OUTPUT : 75 Ω TERMINATED
1.6V
34 TS8388BFS
Product Specification
7.7. OUT OF RANGE BIT
An Out of Range (OR,ORB) bit is provided that goes to logical high state when the input exceeds the positive full scale or falls below the
negative full scale.
When the analog input exceeds the positive full scale, the digital output datas remain at high logical state, with (OR,ORB) at logical one.
When the analog input falls below the negative full scale, the digital outputs remain at logical low state, with (OR,ORB) at logical one again.
7.8. GRAY OR BINARY OUTPUT DATA FORMAT SELECT
The TS8388BFS internal regeneration latches indecision (for inputs very close to latches threshold) may produce errors in the logic encoding
circuitry and leading to large amplitude output errors.
This is due to the fact that the latches are regenerating the internal analog residues into logical states with a finite voltage gain value (Av) within
a given positive amount of time ∆(t) :
Av= exp(∆(t)/τ) , with τ the positive feedback regeneration time constant.
The TS8388BFS has been designed for reducing the probability of occurence of such errors to approximately 10-13 (targetted for the
TS8388BFS at 1GSPS).
A standard technique for reducing the amplitude of such errors down to +/-1 LSB consists to output the digital datas in Gray code format.
Though the TS8388BFS has been designed for featuring a Bit Error Rate of 10-13 with a binary output format, it is possible for the user to select
between the Binary or Gray output data format, in order to reduce the amplitude of such errors when occuring, by storing Gray output codes.
Digital Datas format selection :
BINARY output format if GORB is floating or VCC.
GRAY output format if GORB is connected to ground (0V).
7.9. DIODE PIN 49
One single pin is used for both DRRB input command and die junction monitoring. The pin denomination is DRRB/DIOD. Temperature
monitoring and Data Ready control by DRRB is not possible simultaneously.
-+
11 mA
DVEE
VPLUSD = 2.4V
75 Ω75 Ω
50 Ω
50 Ω
impedance 10 nF
50 Ω
50 Ω
Out 1.38V / 1.05V
OutB 1.05V / 1.38V
Differential output :
± 0.33V = 0.660V
Common mode level : -1.2V
(-1.2V below VPLUSD level)
Figure 7 : DIFFERENTIAL OUTPUT : 50 Ω TERMINATED
1.6V
-+
11 mA
DVEE
VPLUSD = 2.4V
75 Ω75 Ω
75 Ω
75 Ω
impedance
Out 1.6V / 0.8V
OutB 0.8V / 1.6V
Differential output :
± 0.8V = 1.6V
Common mode level : -1.2V
(-1.2V below VPLUSD level)
Figure 8 : DIFFERENTIAL OUTPUT : OPEN LOADED
1.6V
35
Product Specification
TS8388BFS
(See section 7.2 for Data Ready Reset input command).
The operating die junction temperature must be kept below145C, therefore an adequate cooling system has to be set up.
The diode mounted transistor measured Vbe value versus junction temperature is given below.
600
640
680
720
760
800
840
880
920
960
1000
-55 -35 -15 5 25 45 65 85 105 125
Junction temperature (deg.C)
VBE (mV)
36 TS8388BFS
Product Specification
7.10. ADC GAIN CONTROL PIN 60
The ADC gain is adjustable by the means of the pin 60 (input impedance is 1MΩ in parallel with 2pF)
The gain adjust transfert function is given below :
Note : A specific document "DEMUX and ADCs APPLICATION NOTES" has been edited and is available …
0,80
0,85
0,90
0,95
1,00
1,05
1,10
1,15
1,20
-500 -400 -300 -200 -100 0 100 200 300 400 500
Vgain (command voltage) (mV)
ADC Gain
37
Product Specification
TS8388BFS
8. EQUIVALENT INPUT / OUTPUT SCHEMATICS
8.1. EQUIVALENT ANALOG INPUT CIRCUIT AND ESD PROTECTIONS
8.2. EQUIVALENT ANALOG CLOCK INPUT CIRCUIT AND ESD PROTECTIONS
GND=0V
VCC=+5V
VCLAMP= +2.4V
+1.65V
-1.55V
VEE VEE
VCC
GND
VIN VINB
VEE=-5V
Pad
capacitance
340fF
Pad
capacitance
340fF
-0.8V
-5.8V
5.8V
0.8V
200 Ω200 Ω
50 Ω50 Ω
Note : the ESD protection equivalent capacitance is 150 fF.
E21VE21V
-0.8V
-5.8V
VCC=+5V
+0.8V
GND=0V
VEE
VEE=-5V
CLK
VCC
VEE
CLKB
Pad
capacitance
340fF
Pad
capacitance
340fF
-5.8V
-5.8V
-5.8V -5.8V
-5.8V
-5.8V
5.8V5.8V
0.8V 0.8V
150 Ω150 Ω
380 µA 380 µA
Note : the ESD protection equivalent capacitance is 150 fF.
38 TS8388BFS
Product Specification
8.3. EQUIVALENT DATA OUTPUT BUFFER CIRCUIT AND ESD PROTECTIONS
8.4. ADC GAIN ADJUST EQUIVALENT INPUT CIRCUITS AND ESD PROTECTIONS
VPLUSD=0V to 2.4V
DVEE=-5V VEE=-5VVEE=-5V
VEE VEE
OUT OUTB
-5.8V -5.8V
5.8V 5.8V
0.8V
0.8V 0.8V
0.8V
I=11mA
75 Ω75 Ω
-3.7V
Pad
capacitance
180 fF
Pad
capacitance
180 fF
Note : the ESD protection equivalent capacitance is 150 fF.
VEE
VEE VEE=-5V
VCC=+5V
+1.6V
Pad
capacitance
180 fF
-0.8 V
-5.8 V
-0.8 V
-5.8 V
0.8V
0.8V
5.8V
0.8V
0.8V
5.8V
1 kΩ1 kΩ
2 pF 2 pF
GND GND
VEE
VEE
VCC
Pad
capacitance
180 fF
500 µA500
µ
A
GA GAB
NP1032C2 NP1032C2
Note : the ESD protection equivalent capacitance is 150 fF.
39
Product Specification
TS8388BFS
8.5. GORB EQUIVALENT INPUT SCHEMATIC AND ESD PROTECTIONS
GORB: gray or binary select input; floating or tied to VCC -> binary
8.6. DRRB EQUIVALENT INPUT SCHEMATIC AND ESD PROTECTIONS
VCC=+5V
VEE=-5V GND=0V
-0.8V
-0.8V
-5.8V
5.8V
5.8V
5.8V
5 kΩ
1 kΩ1 kΩ
1 kΩ
250
µ
A 250
µ
A
Pad
capacitance
180fF
GORB
VEE
Note : the ESD protection equivalent capacitance is 150 fF.
VEE=-5V
VEE
VCC=+5V
GND=0V
-1.3V
-2.6V
10 kΩ
200 Ω
DRRB
5.8 V
Pad
capacitance
180 fF
Actual protection range: 6.6V above VEE,
In fact stress above GND are clipped by
the CB diode used for Tj monitoring
0.8 V
NP1032C2
Note : the ESD protection equivalent capacitance is 150 fF.
40 TS8388BFS
Product Specification
9. TSEV8388BFS : DEVICE EVALUATION BOARD
For complete specification, see separate TSEV8388BFS document.
GENERAL DESCRIPTION
The TSEV8388BFS Evaluation Board (CEB) is a board which has been designed in order to facilitate the evaluation and the characterization of
the TS8388BFS device up to its 1.5 GHz full power bandwidth at up to 1 Gsps in the military temperature range.
The high speed of the TS8388BFS requires careful attention to circuit design and layout to achieve optimal performance.
This four metal layer board with internal ground plane has the adequate functions in order to allow a quick and simple evaluation of the
TS8388BFS ADC performances over the temperature range.
The TSEV8388BFS Evaluation Board is very straightforward as it only implements the TS8388BFS ADC, SMA connectors for input / output
accesses and a 2.54 mm pitch connector compatible with HP16500C high frequency probes.
The board also implements a de–embedding fixture in order to facilitate the evaluation of the high frequency insertion loss of the input microstrip
lines, and a die junction temperature measurement setting.
The board is constituted by a sandwich of two dielectric layers, featuring low insertion loss and enhanced thermal characteristics for operation in
the high frequency domain and extended temperature range.
The board dimensions are 130 mm x 130 mm.
The board set comes fully assembled and tested, with the TS8388BFS in CQFP68 package installed.
41
Product Specification
TS8388BFS
10. ORDERING INFORMATION
10.1. PACKAGE DEVICE
Manufacturer prefix
Device or family
Temperature range :
Package :
FS : Enhanced
Rth CQFP68 gullwing
TS 8388B M FS 9 N B 3
Screening according to ESA/SCC 9000
B/Q : Mil-PRF-38535, QML level Q
According to DSCC number
5962_0050401 Q4C
Qualification status :
N : Non ESA/SCC qualified
Q : ESA/SCC qualified
ESA/SCC 9000 specification :
B : Level B selection
C : Level C selection
Lot acceptance test :
1 : LAT 1
2 : LAT 2
3 : LAT 3
As described in ESA/SCC 9000
M : -55 < Tc ; Tj < 125°C
10.2. EVALUATION BOARD
TS (X) EV 8388B F ZA2
ZA2 : with MC100EL16
digital receivers
Prototype board
Evaluation board prefix Std CQFP68 package
The evaluation board is delivered with an ADC and includes the heat sink.
42 TS8388BFS
Product Specification
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