ICS844008I Datasheet, PDF (6/18 Pages) Integrated Device Technology – FEMTOCLOCKS™ CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER

ICS844008I-01
FEMTOCLOCKS™ CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER
PARAMETER MEASUREMENT INFORMATION
3.3V±5%
POWER SUPPLY
+ Float GND –
V_DD
V_DDA
LVDS
SCOPE
Qx
nQx
3.3V CORE/3.3V OUTPUT LOAD AC TEST CIRCUIT
nQx
Qx
nQy
Qy
t sk(o)
OUTPUT SKEW
nQA0:nQA3,
nQB0:nQB3
QA0:QA3,
QB0:QB3
t _PW
t
PERIOD
odc = ^{t PW} x 100%
t _PERIOD
OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
V_DD
out
DC Input LVDS
out
➤
V_OS/Δ V_OS
OFFSET VOLTAGE SETUP
Phase Noise Plot
Phase Noise Mask
f₁ ^{Offset Frequency} f₂
RMS Jitter = Area Under the Masked Phase Noise Plot
RMS PHASE JITTER
nQA0:nQA3,
nQB0:nQB3
QA0:QA3,
QB0:QB3
tcycle n
➤
tcycle n+1
➤
tjit(cc) = tcycle n – tcycle n+1
1000 Cycles
CYCLE-TO-CYCLE JITTER
nQA0:nQA3,
nQB0:nQB3
QA0:QA3, _20%
QB0:QB3
80%
t_R
80%
t_F
V_OD
20%
OUTPUT RISE/FALL TIME
V_DD
DC Input LVDS
out
➤
100
V_OD/Δ V_OD
out
DIFFERENTIAL OUTPUT VOLTAGE SETUP
IDT^™ / ICS^™ LVDS FREQUENCY SYNTHESIZER
6
ICS844008AYI-01 REV. B NOVEMBER 21, 2008