
843081AGI-01
www.idt.com
REV. C JULY 25, 2010
6
ICS843081I-01
FEMTOCLOCKSCRYSTAL-TO-
3.3V, 2.5V LVPECL CLOCK MULTIPLIER
PARAMETER MEASUREMENT INFORMATION
OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
OUTPUT RISE/FALL TIME
3.3V OUTPUT LOAD AC TEST CIRCUIT
SCOPE
Qx
nQx
LVPECL
2V
-1.3V ± 0.165V
Clock
Outputs
20%
80%
20%
tR
t F
VSWING
t
PW
t
PERIOD
t
PW
t
PERIOD
odc =
x 100%
Q
nQ
V
EE
V
CC,
V
CCA
2.5V OUTPUT LOAD AC TEST CIRCUIT
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
RMS PHASE JITTER
SCOPE
Qx
nQx
LVPECL
2V
-0.5V ± 0.125V
V
EE
V
CC,
V
CCA