
IDT / ICS LVDS PCI EXPRESS CLOCK SYNTHESIZER
5
ICS844204BK-245 REV. A JULY 9, 2007
ICS844204-245
CRYSTAL-TO-LVDS PCI EXPRESS CLOCK SYNTHESIZER W/SPREAD SPECTRUM
PRELIMINARY
PARAMETER MEASUREMENT INFORMATION
OUTPUT SKEW
PERIOD JITTER
3.3V LVDS OUTPUT LOAD AC TEST CIRCUIT
CYCLE-TO-CYCLE JITTER
VOH
VREF
VOL
Mean Period
(First edge after trigger)
Reference Point
(Trigger Edge)
1
σ contains 68.26% of all measurements
2
σ contains 95.4% of all measurements
3
σ contains 99.73% of all measurements
4
σ contains 99.99366% of all measurements
6
σ contains (100-1.973x10-7)% of all measurements
Histogram
tsk(o)
Qy
Qx
nQy
nQx
OUTPUT RISE/FALL TIME
Clock
Outputs
20%
80%
20%
tR
t F
VOD
t
PW
t
PERIOD
t
PW
t
PERIOD
odc =
x 100%
Q0:Q3
nQ0:nQ3
OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
tcycle n
tcycle n+1
tjit(cc) = tcycle n – tcycle n+1
1000 Cycles
Qx
nQx
SCOPE
Qx
nQx
3.3V±10%
POWER SUPPLY
+–
Float GND
LVDS
V
DD,
V
DDO
V
DDA