ICS840021I Datasheet, PDF (6/11 Pages) Integrated Circuit Systems – FEMTOCLOCKS™ CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
ICS840021I
FEMTOCLOCKS™ CRYSTAL-TO-
LVCMOS/LVTTL CLOCK GENERATOR
PARAMETER MEASUREMENT INFORMATION
1.65V ± 5%
V_DD,
V_DDA
LVCMOS
GND
-1.65V ± 5%
SCOPE
Qx
1.25V ± 5%
V_DD,
V_DDA
LVCMOS
GND
-1.25V ± 5%
SCOPE
Qx
3.3V OUTPUT LOAD AC TEST CIRCUIT
2.5V OUTPUT LOAD AC TEST CIRCUIT
Phase Noise Plot
Phase Noise Mask
f₁ ^{Offset Frequency} f₂
RMS Jitter = Area Under the Masked Phase Noise Plot
20%
Clock
Outputs
80%
t_R
80%
t_F
20%
RMS PHASE JITTER
OUTPUT RISE/FALL TIME
V
DD
Q0
2
t _PW
t
PERIOD
odc = ^{t PW} x 100%
t _PERIOD
OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
840021AGI
www.icst.com/products/hiperclocks.html
6
REV. A MAY 19, 2005