ABV0235/-37/-38/-39
750kHz – 800MHz Low Phase Noise Multiplier VCXO
Universal Low Phase Noise IC’s
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 03/21/05 Page 1
FEATURES
• Selectable 750kHz to 800MHz range.
• Low phase noise output (@ 10kHz frequency
offset, -142dBc/Hz for 19.44MHz, -125dBc/Hz for
155.52MHz, -115dBc/Hz for 622.08MHz).
• CMOS (ABV0237), PECL (ABV0235 and
ABV0238) or LVDS (ABV0239) output.
• 12 to 25MHz crystal input.
• No external load capacitor or varicap required.
• Output Enable selector.
• Wide pull range (+/-200 ppm)
• Selectable 1/16 to 32x frequency multiplier.
• 3.3V operation.
• Available in 16-Pin (TSSOP or 3x3mm QFN).
DESCRIPTION
The ABV0235 (PECL with inverted OE), ABV0237
(CMOS), ABV0238 (PECL), and ABV0239 (LVDS)
are high performance and low phase noise VCXO IC
chips. They provide phase noise performance as low
as –125dBc at 10kHz offset (at 155MHz), by multi-
plying the input crystal frequency up to 32x. The
wide pull range (+/- 200 ppm) and very low jitter
make them ideal for a wide range of applications,
including SONET/SDH and FEC. They accept fun-
damental parallel resonant mode crystals from 12 to
25MHz.
BLOCK DIAGRAM
PIN CONFIGURATION
(Top View)
^: Internal pull-up
*: On 3x3 package, ABV0235/-38 do not have SEL0 av ailable: Pin
10 is VDD, pin 11 is GND. However, ABV02 37/-39 have SEL0 (pin
10), and pin11 is VDD. See pin assignment table for details.
OUTPUT ENABLE LOGICAL LEVELS
Part # OE State
0 (Default) Output enabled
ABV0238 1 Tri-state
0 Tri-state
ABV0235
ABV0237
ABV0239 1 (Default) Output enabled
OE input: Logical states defined by PECL levels fo r ABV0238
Logical states defined by CMOS levels fo r ABV0237/-39
ABV023x
1
2
3
4
5
6
7
8
VDD
9
1
0
1
1
1
2
1
3
1
4
1
5
1
6
XIN
XOUT
SEL3^
SEL2^
OE
VCON
GND
SEL0^
SEL1^
GND
CLKC
VDD
CLKT
GND
GND
A023x
GND
VDD
CLKT
CLKC
1234
12 11 10 9
13
14
15
16
8
7
6
5
XIN
SEL0^ / VDD*
SEL1^
VDD / GND*
SEL3^
XOUT
SEL2^
OE
GND
VCON
GND
GND
X+
X-
OE
Q
ABV023x
Vi
nQ
PLL by-pass
SEL
PLL
(Phase
Locked
Loop)
Oscillator
Amplifier
w/
integrated
varicaps
ABV0235/-37/-38/-39
750kHz – 800MHz Low Phase Noise Multiplier VCXO
Universal Low Phase Noise IC’s
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 03/21/05 Page 2
FREQUENCY SELECTIO N TABLE
SEL3 SEL2 SEL1 SEL0 Selected Multiplier
0 0 1 1 Fin x 32
0 1 1 0 Fin / 8
0 1 1 1 Fin x 2
1 0 0 1 Fin / 2
1 0 1 0 Fin / 16
1 0 1 1 Fin x 4
1 1 0 0 Fin / 4
1 1 0 1 Fin x 8
1 1 1 0 Fin x 16
1 1 1 1 No multiplication
Note: SEL0 is not available (a lways “1”) for ABV0235 and ABV0238 in 3x3mm package
PIN DESCRIPTIONS ABV0235 and ABV0238 (see next page of ABV0237/39)
Name TSSOP
Pin number 3x3mm QFN
Pin number Type Description
XIN 2 12 I Crystal input. See Crystal Specification o n page 4.
XOUT 3 13 I Crystal o utput. See Crystal Specification on page 4.
OE 6 16 I Output enable pin (see OE logic state table on page 1).
VCON 7 1 I Voltage Control input.
GND 8,9,10,14 2,3,4,8,11 P Ground.
CLKT 11 5 O True output PECL
CLKC 13 7 O Complementary output PECL.
SEL0 16 Not available I
SEL1 15 9 I
SEL2 5 15 I
SEL3 4 14 I
Multiplier selector p ins. These pins have an internal pull-u p
that will default SEL to ‘1’ when not connect ed to GND.
VDD 1, 12 6,10 P +3.3V power supply.
ABV0235/-37/-38/-39
750kHz – 800MHz Low Phase Noise Multiplier VCXO
Universal Low Phase Noise IC’s
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 03/21/05 Page 3
PIN DESCRIPTIONS ABV0237/-39 (see previous page of ABV0235/38)
Name TSSOP
Pin number 3x3mm QFN
Pin number Type Description
XIN 2 12 I Crystal input. See Crystal Specification o n page 4.
XOUT 3 13 I Crystal output. See Crystal Specification on page 4.
OE 6 16 I Output enable pin (see OE logic state table on page 1).
VCON 7 1 I Voltage Control input.
GND 8,9,10,14 2,3,4,8 P Ground.
CLKT 11 5 O
True output LVDS (ABV0 239)
(N/C for ABV0237)
CLKC 13 7 O
Complementary o utput LVDS (ABV0239)
(CMOS out for ABV0237).
SEL0 16 10 I
SEL1 15 9 I
SEL2 5 15 I
SEL3 4 14 I
Multiplier selector p ins. These pins have an internal pull-u p
that will default SEL to ‘1’ when not connect ed to GND.
VDD 1, 12 6,11 P +3.3V power supply.
ELECTRICAL SPECIFICATIONS
1. Absolute Maximum Ratings
PARAMETERS SYMBOL MIN. MAX. UNITS
Supply Voltage VDD 4.6 V
Input Voltage, dc VI -0.5 VDD+0.5 V
Output Voltage, dc VO -0.5 VDD+0.5 V
Storage Temperature TS -65 150
°C
Ambient Operating T emperature* TA -40 85 °C
Junction Temperature TJ 125
°C
Lead Temperature ( soldering, 10s) 260 °C
ESD Protection, Human Body Model 2 kV
Exposure of the d evice under conditions beyond the limits specified by Maximum Ratings for extended periods may cause pe rmanent damage to the
device and affect product reliability. These conditions represent a stress rating on ly, and functional operations of the devic e at these or any other con-
ditions above the operational limits noted in this spec ification is not implied.
* Note: Operating Temperature is guaranteed by design for all parts (COMMERC IAL and INDUSTRIAL), but tested fo r COMMERCIAL grade only.
ABV0235/-37/-38/-39
750kHz – 800MHz Low Phase Noise Multiplier VCXO
Universal Low Phase Noise IC’s
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 03/21/05 Page 4
2. Crystal Specifications
PARAMETERS SYMBOL CONDITIONS MIN. TYP. MAX. UNITS
Crystal Resonator Freque ncy FXIN Parallel Fundamental Mod e 12 25 MHz
Crystal Loading Rat ing C L (xtal) At VCON = 1.65V 9.5 pF
Crystal Pullability C0/C1 (xtal) AT cut 250 -
Recommended ESR RE AT cut 30 Ω
Note: Crystal Loading rating: 9.5pF is the loading th e crystal sees fro m the VCXO chip at VCON = 1.65V. It is assu med that the crys tal will be at nomi-
nal frequency at this load. If the crystal requ ires more load to be a t nominal frequency, the additional load must be added ext ernally. This however may
reduce the pull range.
3. Voltage Control Crystal Oscillator
PARAMETERS SYMBOL CONDITIONS MIN. TYP. MAX. UNITS
VCXO Stabilization Time * TVCXOSTB From power valid 10 ms
VCXO Tuning Range FXIN = 12 – 25MHz;
XTAL C0/C1 < 250
0V ≤ VCON ≤ 3.3V 500 ppm
CLK output pullab ility VCON=1.65V, ±1.65V ±200 ppm
VCXO Tuning Characteristic 150 ppm/V
Pull range linearit y 10 %
VCON pin input impedan ce 2000
kΩ
VCON modulation BW 0V ≤ VCON ≤ 3.3V, -3dB 25 kHz
Note: Parame ters denoted with an asterisk (*) repres ent nominal characteriza tion data and are not production tes ted to any specific limits.
4. General Electrical Specifications
PARAMETERS SYMBOL CONDITIONS MIN. TYP. MAX. UNITS
Fout<24MHz 25/25/15
24MHz<Fout<96MHz 65/45/30
Supply Current,
Dynamic (with
Loaded Outputs) IDD PECL/LVD S/CMOS 96MHz<Fout< 800MHz 100/80/40
mA
Operating Volt age VDD 2.97
3.63 V
Output Clock
Duty Cycle @ 50% VDD (CMOS)
@ 1.25V (LVDS)
@ VDD – 1.3V (PECL)
45
45
45
50
50
50
55
55
55 %
Short Circuit
Current
±50 mA
ABV0235/-37/-38/-39
750kHz – 800MHz Low Phase Noise Multiplier VCXO
Universal Low Phase Noise IC’s
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 03/21/05 Page 5
5. Jitter Specifica tions
PARAMETERS CONDITIONS FREQUENCY MIN. TYP. MAX. UNITS
19.44MHz 2.2
77.76MHz 4.5
155.52MHz 4.5
Period jitter RMS With capaciti ve decoupling be-
tween VDD and GND.
Over 10,000 cycles. 622.08MHz 5.0
ps
19.44MHz 17
77.76MHz 25
155.52MHz 27
Period jitter Peak-to-
Peak1
With capacitive deco upling be-
tween VDD and GND.
Over 10,000 cycles. 622.08MHz 35
ps
155.52MHz 2.5 4
Integrated jitter RMS2 Integrated 12 kHz to 20 MHz 622.08MHz 2.5 4 ps
6. Phase Noise Specifications
PARAMETERS FREQUENCY @10Hz @100Hz @1kHz @10kHz @100kHz UNITS
19.44MHz -80 -108 -132 -142 -150
77.76MHz -72 -103 -122 -130 -125
155.52MHz -65 -95 -120 -125 -121
Phase Noise relative
to carrier
(typical) 622.08MHz -55 -85 -109 -115 -110
dBc/Hz
Note: Phase Nois e measured at VCON = 0V
7. CMOS Electrical Characteristics
PARAMETERS SYMBOL CONDITIONS MIN. TYP. MAX. UNITS
IOH V
OH= VDD-0.4V, VDD=3.3V 10 mA
Output drive current IOL V
OL = 0.4V, VDD = 3.3V 10 mA
Output Clock Rise/Fall Time 0.3V ~ 3.0V w ith 15 pF load 2.4 ns
ABV0235/-37/-38/-39
750kHz – 800MHz Low Phase Noise Multiplier VCXO
Universal Low Phase Noise IC’s
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 03/21/05 Page 6
8. LVDS Electrical Characteristics
PARAMETERS SYMBOL CONDITIONS MIN. TYP. MAX. UNITS
Output Differential Voltage VOD 247 355 454 mV
VDD Magnitude Change ∆VOD -50 50 mV
Output High Voltage VOH 1.4 1.6 V
Output Low Voltage VOL 0.9 1.1 V
Offset Voltage VOS 1.125 1.2 1.375 V
Offset Magnitu de Change ∆VOS
RL = 100 Ω
(see figure)
0 3 25 mV
Power-off Leakage IOXD Vout = VDD or GND
VDD = 0V ±1 ±10 uA
Output Short Circuit Current IOSD -5.7 -8 mA
9. LVDS Switching Characteristics
PARAMETERS SYMBOL CONDITIONS MIN. TYP. MAX. UNITS
Differential Clock Rise Time tr 0.2 0.7 1.0 ns
Differential Clock Fall Time tf
RL = 100 Ω
CL = 10 pF
(see figure) 0.2 0.7 1.0 ns
OUT
OUT
V
OD
V
OS
50
Ω
50
Ω
OUT
V
DIFF
R
L
= 100
Ω
C
L
= 10pF
C
L
= 10pF
LVDS Switching Test CircuitLVDS Levels Test Circuit
LVDS Transistion Time Waveform
OUT
OUT
OUT
0V (Differential)
0V
20%
80%
20%
80%
t
R
t
F
V
DIFF
ABV0235/-37/-38/-39
750kHz – 800MHz Low Phase Noise Multiplier VCXO
Universal Low Phase Noise IC’s
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 03/21/05 Page 7
10. PECL Electrical Characteristics
PARAMETERS SYMBOL CONDITIONS MIN. MAX. UNITS
Output High Voltage VOH V
DD – 1.025 V
Output Low Voltage VOL RL = 50 Ω to (VDD – 2V)
(see figure) V
DD – 1.620 V
11. PECL Switching Cha racteristics
PARAMETERS SYMBOL CONDITIONS MIN. TYP. MAX. UNITS
Clock Rise Time tr 20%~80% of Waveform 0.6 1.5 ns
Clock Fall Time tf 20%~80% of Waveform 0.6 1.5 ns
OUT
OUT
50
Ω
50
Ω
PECL Levels Test Circuit
PECL Transistion Time Waveform
OUT
OUT
50%
20%
80%
t
R
t
F
VDD
DUTY CYCLE
45 - 55% 55 - 45%
50%
OUT
OUT
t
SKEW
PECL Output Skew
2.0V
ABV0235/-37/-38/-39
750kHz – 800MHz Low Phase Noise Multiplier VCXO
Universal Low Phase Noise IC’s
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 03/21/05 Page 8
PACKAGE INFORMATION
CL
A
EH
D
A1
eB
16 PIN TSSOP ( mm )
Symbol Min. Max.
A-1.20
A1 0.05 0.15
B0.190.30
C0.090.20
D4.905.10
E4.304.50
H 6.40 BSC
L0.450.75
e 0.65 BSC
3x3mm QFN
ABV0235/-37/-38/-39
750kHz – 800MHz Low Phase Noise Multiplier VCXO
Universal Low Phase Noise IC’s
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 03/21/05 Page 9
ORDERING INFORMATION
Abracon Corporation, reserves the right to make changes in its products or specifications, or both a t any time without notic e. The information fur-
nished by Abraco n is believed to be accu rate and reliable . However, Abraco n makes no guarantee or warranty concerning the accu racy of said info r-
mation and shall not be responsible for any loss o r damage of whatever na ture resulting from the use o f, or reliance upon this p roduct.
LIFE SUPPORT POLICY : Abracon’s products are n ot authorized for use as critic al components in life support devices or sy stems without the exp ress
written approval of the President of Abracon Corporation .
For part ordering, please contact our Sales Department:
30332 Esperanza., R ancho Santa Margarit a, Ca 92688
Ph: 949-546-8000 Fax: 949- 546-8001
PART NUMBER
The order number for this d evice is a combination of th e following:
Device number, Packag e type, Operating temperature ra nge, shipping method
ABV023x X X X -T
Order Number Marking Package Option
ABV0235OC ABV0235OC 16-Pin TSSOP (T ube)
ABV0235OC-T ABV0235OC 16-P in TSSOP (Tape and Reel)
ABV0235QC ABV0235QC 16-Pin 3x3 QFN (Tube)
ABV0235QC-T ABV0235QC 16-P in 3x3 QFN (Tape and Ree l)
ABV0235OCL ABV0235OCL 16-Pin TSSOP (T ube)
ABV0235OCL-T ABV0235OCL 16-Pin TSSOP (T ape and Reel)
ABV0235QCL ABV0235QCL 16-Pin 3x3 QFN (Tube)
ABV0235QCL-T ABV0235QCL 16-Pin 3x3 QFN (Tape and Reel)
ABV0237OC ABV0237OC 16-P in TSSOP (Tube)
ABV0237OC-T ABV0237OC 16-P in TSSOP (Tape and Reel)
ABV0237QC ABV0237QC 16-P in 3x3 QFN (Tube)
ABV0237QC-T ABV0237QC 16-P in 3x3 QFN (Tape and Ree l)
ABV0237OCL ABV0237OCL 16-Pin TSSOP (T ube)
ABV0237OCL-T ABV0237OCL 16-Pin TSSOP (T ape and Reel)
ABV0237QCL ABV0237QCL 16-Pin 3x3 QFN (Tube)
ABV0237QCL-T ABV0237QCL 16-Pin 3x3 QFN (Tape and Reel)
ABV0238OC ABV0238OC 16-P in TSSOP (Tube)
ABV0238OC-T ABV0238OC 16-P in TSSOP (Tape and Reel)
ABV0238QC ABV0238QC 16-P in 3x3 QFN (Tube)
ABV0238QC-T ABV0238QC 16-P in 3x3 QFN (Tape and Ree l)
ABV0238OCL ABV0238OCL 16-Pin TSSOP (T ube)
ABV0238OCL-T ABV0238OCL 16-Pin TSSOP (T ape and Reel)
ABV0238QCL ABV0238QCL 16-Pin 3x3 QFN (Tube)
ABV0238QCL-T ABV0238QCL 16-Pin 3x3 QFN (Tape and Reel)
ABV0239OC ABV0239OC 16-P in TSSOP (Tube)
ABV0239OC-T ABV0239OC 16-P in TSSOP (Tape and Reel)
ABV0239QC ABV0239QC 16-P in 3x3 QFN (Tube)
ABV0239QC-T ABV0239QC 16-P in 3x3 QFN (Tape and Ree l)
ABV0239OCL ABV0239OCL 16-Pin TSSOP (T ube)
ABV0239OCL-T ABV0239OCL 16-Pin TSSOP (T ape and Reel)
ABV0239QCL ABV0239QCL 16-Pin 3x3 QFN (Tube)
ABV0239QC
L
-
T
ABV0239QC
L
16
-
Pin 3x3 QFN (Tape and Reel)
PART NUMBER
TEMPERATURE
C=COMMERCIAL
I=INDUSTRAL
PACKAGE TYPE
O=TSSOP Q=QFN
NONE=NORMAL PACKAGE
L=GREEN PACKAGE
NONE= TUBE
-T=TAPE AND REEL
