ABX0235/37/38/39
750kHz – 800MHz Low Phase Noise Multiplier XO
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, -140dBc/Hz for 19.44MHz, -127dBc/Hz for
106.25MHz, -125dBc/Hz for 155.52MHz, -
110dBc/Hz for 622.08MHz).
• CMOS (ABX0237), PECL (ABX0235 and
ABX0238) or LVDS (ABX0239) output.
• 12 to 25MHz crystal input.
• No external load capacitor required.
• Output Enable selector.
• Selectable 1/16 to 32x frequency multiplier.
• 3.3V operation.
• Available in 16-Pin (TSSOP or 3x3mm QFN).
DESCRIPTION
The ABX0235 (PECL with inverted OE), ABX0237
(CMOS), ABX0238 (PECL), and ABX0239 (LVDS)
are high performance and low phase noise XO IC
chips. They provide phase noise performance as low
as –125dBc at 1kHz offset (at 155MHz) and a typical
RMS jitter of 4pS RMS ( at 155MHz ). They accept
fundamental parallel resonant mode crystals from 12
to 25MHz.
BLOCK DIAGRAM
PIN CONFIGURATION
(Top View)
^: Internal pull-up
*: On 3x3 package, ABX0235/38 do not have SEL0 available: Pin 10
is VDD, pin 11 is GND. However, ABX0237/39 have SEL0 (pin
10), and pin 11 is VDD. See pin assignment table for details.
OUTPUT ENABLE LOGICAL LEVELS
Part # OE State
0 (Default) Output enabled
ABX0238 1 Tri-state
0 Tri-state
ABX0235
ABX0237
ABX0239 1 (Default) Output enabled
OE input: Logical states defined by PECL levels for ABX0238
Logical states defined by CMOS levels for
ABX0235/37/39
ABX023x
1
2
3
4
5
6
7
8
VDD
9
10
11
12
13
14
15
16
XIN
XOUT
SEL3^
SEL2^
OE
GND
GND
SEL0^
SEL1^
GND
CLKC
VDD
CLKT
GND
GND
ABX023x
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
GND
GND
GND
XIN
XOUT
OE
Q
Q
PLL by-pass
SEL
PLL
(Phase
Locked
Loop)
Oscillator
Amplifier
ABX0235/37/38/39
750kHz – 800MHz Low Phase Noise Multiplier XO
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 SELECTION 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 (always “1”) for ABX0235 and ABX0238 in 3x3mm package
PIN DESCRIPTIONS ABX0235 and ABX0238 (see next page of ABX0237/39)
Name TSSOP
Pin number
3x3mm QFN
Pin number Type Description
XIN 2 12 I Crystal input. See Crystal Specifications on page 3.
XOUT 3 13 I Crystal output. See Crystal Specifications on page 3.
OE 6 16 I Output enable pin (see OE logic state table on page 1).
GND 7,8,9,10,14 1,2,3,4,8,11 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 pins. These pins have an internal pull-up
that will default SEL to ‘1’ when not connected to GND.
VDD 1, 12 6,10 P Power Supply.
ABX0235/37/38/39
750kHz – 800MHz Low Phase Noise Multiplier XO
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 ABX0237/39 (see previous page of ABX0235/38)
Name TSSOP
Pin number
3x3mm QFN
Pin number Type Description
XIN 2 12 I Crystal input. See Crystal Specifications on page 3.
XOUT 3 13 I Crystal output. See Crystal Specifications on page 3.
OE 6 16 I Output enable pin (see OE logic state table on page 1).
GND 7,8,9,10,14 1,2,3,4,8 P Ground.
CLKT 11 5 O
True output LVDS (ABX0239)
(N/C for ABX0237)
CLKC 13 7 O
Complementary output LVDS (ABX0239)
(CMOS out for ABX0237).
SEL0 16 10 I
SEL1 15 9 I
SEL2 5 15 I
SEL3 4 14 I
Multiplier selector pins. These pins have an internal pull-up
that will default SEL to ‘1’ when not connected to GND.
VDD 1, 12 6,11 P 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 Temperature* 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 device under conditions beyond the limits specified by Maximum Ratings for extended periods may cause permanent damage to the
device and affect product reliability. These conditions represent a stress rating only, and functional operations of the device at these or any other con-
ditions above the operational limits noted in this specification is not implied.
* Note: Operating Temperature is guaranteed by design for all parts (COMMERCIAL and INDUSTRIAL), but tested for COMMERCIAL grade only.
2. Crystal Specifications
PARAMETERS SYMBOL CONDITIONS MIN. TYP. MAX. UNITS
Crystal Resonator Frequency FXIN Parallel Fundamental Mode 12 25 MHz
Crystal Loading Rating CL (xtal) 20 pF
Recommended ESR RE AT cut 30 Ω
ABX0235/37/38/39
750kHz – 800MHz Low Phase Noise Multiplier XO
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
3. 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/LVDS/CMOS
96MHz<Fout<800MHz 100/80/40
mA
Operating Voltage 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
4. Jitter Specifications
PARAMETERS CONDITIONS FREQUENCY MIN. TYP. MAX. UNITS
19.44MHz 2.2
77.76MHz 3.5
155.52MHz 4.3
Period jitter RMS1
With capacitive 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 decoupling be-
tween VDD and GND.
Over 10,000 cycles.
622.08MHz 35
ps
155.52MHz 2.6 4
Integrated jitter RMS2 Integrated 12 kHz to 20 MHz 622.08MHz 2.5 4 ps
5. 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 Noise2 relative
to carrier
(typical)
622.08MHz -55 -85 -109 -115 -110
dBc/Hz
6. 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 with 15 pF load 2.4 ns
ABX0235/37/38/39
750kHz – 800MHz Low Phase Noise Multiplier XO
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
7. 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 Magnitude 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
8. 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
ABX0235/37/38/39
750kHz – 800MHz Low Phase Noise Multiplier XO
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
9. 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
10. PECL Switching Characteristics
PARAMETERS SYMBOL CONDITIONS MIN. TYP. MAX. UNITS
Clock Rise Time tr 0.8V ~ 2.0V 1.5 ns
Clock Fall Time tf 2.0V ~ 0.8V 1.5 ns
Duty Cycle Measured @ 1.4V 40 50 60 %
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
ABX0235/37/38/39
750kHz – 800MHz Low Phase Noise Multiplier XO
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
PACKAGE INFORMATION
C
L
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
ABX0235/37/38/39
750kHz – 800MHz Low Phase Noise Multiplier XO
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
ORDERING INFORMATION
Abracon Corporation, reserves the right to make changes in its products or specifications, or both at any time without notice. The information fur-
nished by Abracon is believed to be accurate and reliable. However, Abracon makes no guarantee or warranty concerning the accuracy of said infor-
mation and shall not be responsible for any loss or damage of whatever nature resulting from the use of, or reliance upon this product.
LIFE SUPPORT POLICY: Abracon’s products are not authorized for use as critical components in life support devices or systems without the express
written approval of the President of Abracon Corporation.
For part ordering, please contact our Sales Department:
30332 Esperanza., Rancho Santa Margarita, Ca 92688
Ph: 949-546-8000 Fax: 949-546-8001
PART NUMBER
The order number for this device is a combination of the following:
Device number, Package type and Operating temperature range
ABX023x O C
Order Number Marking Package Option
ABX0235OC-T ABX0235OC TSSOP - Tape and Reel
ABX0235OC ABX0235OC TSSOP – Tube
ABX0235QC-TABX0235QCQFN - Tape and Reel
ABX0235QC ABX0235QC QFN – Tube
ABX0237OC-T ABX0237OC TSSOP - Tape and Reel
ABX0237OC ABX0237OC TSSOP – Tube
ABX0237QC-TABX0237QCQFN - Tape and Reel
ABX0237QC ABX0237QC QFN – Tube
ABX0238OC-T ABX0238OC TSSOP - Tape and Reel
ABX0238OC ABX0238OC TSSOP – Tube
ABX0238QC-T ABX0238QC QFN - Tape and Reel
ABX0238QC ABX0238QC QFN – Tube
ABX0239OC-T ABX0239OC TSSOP - Tape and Reel
ABX0239OC ABX0239OC TSSOP – Tube
ABX0239QC-TABX0239QCQFN - Tape and Reel
ABX0239QC ABX0239QC QFN - Tube
PART NUMBER TEMPERATURE
C=COMMERCIAL
I=INDUSTRAL
PACKAGE TYPE
O=TSSOP Q=QFN
