ICS844008I-15 Datasheet, PDF (6/12 Pages) Integrated Circuit Systems – FEMTOCLOCKS™ CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844008I-15
FEMTOCLOCKS™ CRYSTAL-TO-
LVDS FREQUENCY SYNTHESIZER
PARAMETER MEASUREMENT INFORMATION
3.3V±5%
POWER SUPPLY
+ Float GND -
LVDS
Qx ^SCOPE
nQx
Phase Noise Plot
Phase Noise Mask
3.3V CORE/3.3V OUTPUT LOAD AC TEST CIRCUIT
nQx
Qx
nQy
Qy
t sk(o)
OUTPUT SKEW
f₁ ^{Offset Frequency} f₂
RMS Jitter = Area Under the Masked Phase Noise Plot
RMS PHASE JITTER
nQ0:nQ7
Q0:nQ7
tcycle n
➤
tcycle n+1
➤
tjit(cc) = tcycle n –tcycle n+1
1000 Cycles
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
V_DD
out
DC Input LVDS
out
➤
V_OS/Δ V_OS
Clock _20%
Outputs
80%
t_R
OUTPUT RISE/FALL TIME
V_DD
DC Input LVDS
80%
t_F
V_{SW I N G}
20%
out
➤
100
V_OD/Δ V_OD
out
OFFSET VOLTAGE SETUP
844008AYI-15
DIFFERENTIAL OUTPUT VOLTAGE SETUP
www.icst.com/products/hiperclocks.html
6
REV. A FEBRUARY 2, 2006