
IDT / ICS 3.3V, 2.5V LVPECL CLOCK GENERATOR
6
ICS843251BGI-12 REV. A NOVEMBER 19, 2012
ICS843251I-12
FEMTOCLOCK
CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
SCOPE
Qx
nQx
LVPECL
V
EE
PARAMETER MEASUREMENT INFORMATION
RMS PHASE JITTER
LVPECL 3.3V OUTPUT LOAD AC TEST CIRCUIT
LVPECL 2.5V OUTPUT LOAD AC TEST CIRCUIT
OUTPUT RISE/FALL TIME
OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
t
PW
t
PERIOD
t
PW
t
PERIOD
odc =
x 100%
Q
nQ
20%
80%
20%
tR
t F
VSWING
Phase Noise Mask
Offset Frequency
f
1
f
2
Phase Noise Plot
RMS Jitter = Area Under the Masked Phase Noise Plot
Noise
P
o
w
e
r
SCOPE
Qx
nQx
LVPECL
V
EE
2V
-1.3V ± 0.165V
V
CC
2V
-0.5V ± 0.125V
V
CC
V
CCA
2V
V
CCA
2V
Q
nQ