Data Sheet

VFJA911
25 MHz Jitter Attenuator
LVPECL Output
Features
¾
¾
¾
¾
¾
RoHS Status
LVPECL output
Ultra Low Jitter: 0.25ps RMS
Phase Noise: -138 dBc/Hz @ 1KHz
Free-run mode
No external components required
Applications
¾
Synchronous Ethernet
Description
The VFJA911 is a Jitter Attenuator that provides an LVPECL output with a frequency of 25MHz. With less than
0.4 dBc of jitter peaking the device allows for cascading multiple stages within the network. A select input [Sel]
allows the user to switch from the external input reference to a free-run mode. In free-run mode the device
outputs a 25MHz clock that is not locked to the input reference frequency. Operating with a +3.3 volt power
supply the device typically consumes 135mW. The VFJA911 is available in a 15.0mm x 13.0mm surface mount
package.
Filter
Fout
F in
R-Divider
VCXO
PFD
nFout
OD
Sel
N- Divider
Block Diagram
75 South Street, Hopkinton, MA 01748 • 800-982-5737 • 508-435-6831 • www.valpeyfisher.com • RevA0508
1
VFJA911
25 MHz Jitter Attenuator
LVPECL Output
Absolute Maximum Ratings
Parameter
Supply Break
Down Voltage
Storage
Temperature
Symbol
Condition
Min
Typ
Max
Unit
Vcc
-0.5
5.5
V
Ts
-55
+105°
°C
Note
Electrical Specifications
Parameter
Output
Frequency
Range
Input
Frequency
Range
Input Level
Output Level
Logic “1”
Output Level
Logic “0”
Jitter RMS
Symbol
SSB Phase
Noise
Фn
APR
Free-run
Accuracy
Modulation
BW
Duty Cycle
Rise / Fall
Time
Start up time
Condition
Min
Fout
Slew Rate 2.5V / ns
(min)
Vin
AC coupled internally
Vol
Max
25.0
Fin
Voh
Typ
MHz
0.4
3.3
V p-p
Vcc-0.96
Vcc-0.81
V
Vcc-1.85
Vcc-1.65
V
12KHz to 20MHz
100Hz
1KHz
10KHz
100KHz
0.25
-118
-138
-145
-153
ps
dBc/Hz
± 100
-40ºC to +85ºC
ppm
30
Tr/Tf
Select Input
Sel
Output
Disable
Supply
Voltage
Input Current
Operating
Temperature
Range
OD
45
@ 25 MHz
ppm
60
@ 50%
Note
MHz
25.0
50 Ohm to Vcc-2V or
Thevenin Equivalent
Unit
Hz
50
20% to 80%
55
%
0.6
ns
Note 1
2
10
ms
Logic “1” = Free Run Mode
Logic “0” = External Input Reference
Logic “1” = Output Disabled
Logic “0” or Floating = Output Enabled
Vcc
3.15
Icc
3.30
40
Ta
-40°
3.45
V
45
mA
+85°
°C
75 South Street, Hopkinton, MA 01748 • 800-982-5737 • 508-435-6831 • www.valpeyfisher.com • RevA0508
2
LVCMOS
LVCMOS
VFJA911
25 MHz Jitter Attenuator
LVPECL Output
Environmental and Mechanical
Parameter
Mechanical Shock
Thermal Shock
Specification
Per MIL-STD-202, Method 213, Condition E
Per MIL-STD-883, Method 1011, Condition A
Vibration
Per MIL-STD-883, Method 2007, Condition A
Soldering Conditions
260°C for 10s max
Hermetic Seal
-8
Leak rate less than 5x10 atm.cc/s of helium (crystal only)
Mechanical Outline
Connection Diagram
Vcc = +3.3V
OD
.1 uF
9 4
8
.1 uF
Fin
1
7
Fout 1
Sel
3
6
Fout 2
5 10
Gnd
Pin #
1
2
3
4
5
6
7
8
9
10
Description
Fin
N/C
Sel
Vcc
Gnd
nFout
Fout
Output Disable
Vcc
Gnd
Sel
0
1
Input Frequency
(MHz)
25.00 MHz
Free-run Mode
Output Frequency
(MHz)
25.00
25.00
Table 1
75 South Street, Hopkinton, MA 01748 • 800-982-5737 • 508-435-6831 • www.valpeyfisher.com • RevA0508
3
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