ICS844008I-46 Datasheet, PDF (6/15 Pages) Integrated Device Technology – FEMTOCLOCKS CRYSTAL-TO-LVDS CLOCK GENERATOR

ICS844008I-46
FEMTOCLOCKS™ CRYSTAL-TO-LVDS CLOCK GENERATOR
PARAMETER MEASUREMENT INFORMATION
2.5V±5%
POWER SUPPLY
+ Float GND –
V_DD,
V_{DDO VDDA}
LVDS
SCOPE
Qx
nQx
Phase Noise Plot
Phase Noise Mask
f₁ ^{Offset Frequency} f₂
RMS Jitter = Area Under the Masked Phase Noise Plot
2.5V LVDS OUTPUT LOAD AC TEST CIRCUIT
RMS PHASE JITTER
nQ0:nQ7
Q0:nQ7
tcycle n
➤
tcycle n+1
➤
tjit(cc) = tcycle n – tcycle n+1
1000 Cycles
nQx
Qx
nQy
Qy
t sk(o)
CYCLE-TO-CYCLE JITTER
nQ0:nQ7
Q0:Q7
t _PW
t
PERIOD
odc = ^{t PW} x 100%
t _PERIOD
OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
IDT^™ / ICS^™ LVDS CLOCK GENERATOR
OUTPUT SKEW
nQ0:nQ7
20%
Q0:Q7
80%
t_R
80%
t_F
V_OD
20%
OUTPUT RISE/FALL TIME
6
ICS844008AKI-46 REV. A MAY 19, 2008