Data Sheet

VFJA915
Jitter Attenuator with 3 Input Frequency
Selections plus Free-run Mode
RoHS Status
Features
¾
¾
¾
¾
25MHz Output Frequency
Wide Lock Range
Ultra Low Jitter and Phase Noise: -143 dBc/Hz @ 1KHz
Low Power: < 150mW typical
Applications
¾
¾
¾
Sonet / SDH / ATM
10 Gigabit Ethernet
Wireless Infrastructure
Description
The VFJA915 is a Jitter Attenuator that provides two LVCMOS outputs with a frequency of 25MHz. The device
will frequency lock to an input frequency with an error in excess of +/- 130ppm from nominal. Two select inputs
[S1,S0] allow the user to select 1 of 3 preset input frequencies or 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 150mW. The VFJA915 is available in a 19.5mm x 15.5mm surface mount
package.
Filter
Fout 1
R-Divider
F in
VCXO
PFD
Fout 2
S0
S1
N- Divider
Vcc
Vccp
.1 uF
Block Diagram
75 South Street, Hopkinton, MA 01748 • 800-982-5737 • 508-435-6831 • FAX 508-435-5289 • www.valpeyfisher.com • Rev_B0209
1
VFJA915
Jitter Attenuator with 3 Input Frequency
Selections plus Free-run Mode
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”
Phase Jitter
Symbol
SSB Phase
Noise
Фn
Condition
Min
Fout
Typ
Max
Unit
25
MHz
2.5
25.0
125
MHz
Fin
Slew Rate 2.5V / ns
(min)
Vin
AC coupled internally
0.4
3.3
V p-p
Voh
IOH = 8 mA
Vcc-.6
Vcc
V
Vol
IOL = 8 mA
0.0
0.3
V
12KHz to 20MHz
100Hz
1KHz
10KHz
100KHz
± 130
APR
Free-run
-40ºC to +85ºC
Accuracy
Modulation
BW
@ 50%
Duty Cycle
Rise / Fall
Tr/Tf
20% to 80%
Time
Start up time
Supply
Vcc
Voltage
Icc
Input Current
Operating
Ta
Temperature
Range
Notes:
1. Consult Factory for optional bandwidths
0.20
-120
-143
-153
-163
± 145
dBc/Hz
-40°
ppm
Hz
55
%
0.6
ns
3
3.15
@ 25 MHz
ppm
10
50
See Table 1
ps(rms)
±60
45
Note
Note 1
s
3.30
3.45
V
45
55
mA
+85°
°C
75 South Street, Hopkinton, MA 01748 • 800-982-5737 • 508-435-6831 • FAX 508-435-5289 • www.valpeyfisher.com • Rev_B0209
2
VFJA915
Jitter Attenuator with 3 Input Frequency
Selections plus Free-run Mode
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
C1
0.1 uF
3 4
Fin
1
12
Fout 1
S1
S0
5
7
11
Fout 2
8 14
Gnd
Pin #
Description
1
Fin
2
DNC
3
Vccp*
4
Vcc
5
S1
6
DNC
7
S0
8
Gnd
9
N/C
10
N/C
11
Fout 2
12
Fout 1
13
N/C
14
Gnd
* Connect pin #3 to pin #4 and
add 0.1 uF
Table 1
S1:S0
00
01
10
11
Input Frequency
(MHz)
Free-run Mode
2.5
25.0
125
Output Frequency
(MHz)
25.00
25.00
25.00
25.00
75 South Street, Hopkinton, MA 01748 • 800-982-5737 • 508-435-6831 • FAX 508-435-5289 • www.valpeyfisher.com • Rev_B0209
3
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