ICS844004I-04 Datasheet, PDF (6/13 Pages) Integrated Circuit Systems – FEMTOCLOCKS™ CRYSTAL/LVCMOS-TO-LVDS FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844004I-04
FEMTOCLOCKS™ CRYSTAL/LVCMOS-TO-
LVDS FREQUENCY SYNTHESIZER
PARAMETER MEASUREMENT INFORMATION
V_DD
Power Supply
Float GND
+
-
LVDS
nQx
SCOPE
Qx
Qx
nQy
nQx
Qy
t sk(o)
3.3V CORE/3.3V OUTPUT LOAD AC TEST CIRCUIT
OUTPUT SKEW
Phase Noise Plot
Phase Noise Mask
nQ0:nQ3
Q0:Q3
f₁ ^{Offset Frequency} f₂
RMS Jitter = Area Under the Masked Phase Noise Plot
t _PW
t
PERIOD
odc = ^{t PW} x 100%
t _PERIOD
RMS PHASE JITTER
Clock
20%
Outputs
80%
t_R
80%
t_F
OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
V_DD
out
V_SWING ^{DC Input LVDS}
20%
out
➤
V_OS/Δ V_OS
OUTPUT RISE/FALL TIME
V_DD
DC Input LVDS
OFFSET VOLTAGE SETUP
out
➤
100
V_OD/Δ V_OD
out
DIFFERENTIAL OUTPUT VOLTAGE SETUP
844004AGI-04
www.icst.com/products/hiperclocks.html
6
REV. A JANUARY 26, 2006