
IDT / ICS 3.3V LVPECL FREQUENCY SYNTHESIZER
6
ICS843204AGI REV. A MARCH 18, 2009
ICS843204I
FEMTOCLOCK CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
PARAMETER MEASUREMENT INFORMATION
t
PW
t
PERIOD
t
PW
t
PERIOD
odc =
x 100%
QA0, QA1
QB0, QB1
RMS PHASE JITTER
BANK SKEW
3.3V CORE/3.3V OUTPUT LOAD AC TEST CIRCUIT
OUTPUT RISE/FALL TIME
20%
80%
20%
tR
t F
VSWING
nQA0, nQA1
nQB0, nQB1
OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
tsk(b)
Qy
Qx
nQy
nQx
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
er
SCOPE
Qx
nQx
LVPECL
V
EE
2V
-1.3V ± 0.33V
V
CC,
V
CCO_A,
V
CCO_B
2V
V
CCA_A
QA0, QA1
QB0, QB1
nQA0, nQA1
nQB0, nQB1
Where X = A or B outputs
2V
V
CCA_B