ICS841654I Datasheet, PDF (7/17 Pages) Integrated Device Technology – FEMTOCLOCKS™ CRYSTAL-TO-HCSL CLOCK GENERATOR

ICS841654I
FEMTOCLOCKS™ CRYSTAL-TO-HCSL CLOCK GENERATOR
PARAMETER MEASUREMENT INFORMATION
3.3V±5%
3.3V±5%
VDD,
VDDOA, _VDDA
VDDOB
HCSL
GND
475Ω
IREF
0V
50Ω
50Ω
SCOPE
3.3V±5%
3.3V±5%
VDD,
VDDOA,
VDDOB
VDDA
HCSL
GND
0V
475Ω
IREF
33Ω
33Ω
50Ω
49.9Ω
50Ω
49.9Ω
Qx
2pF
nQx
2pF
HCSL OUTPUT LOAD AC TEST CIRCUIT
1.65V±5%
1.65V±5%
V_DD
VDDA
LVCMOS
GND
SCOPE
Qx
-1.65V±5%
3.3V LVCMOS OUTPUT LOAD AC TEST CIRCUIT
nQA[0:1],
nQB[0:1]
QA[0:1],
QB[0:1]
tcycle n
➤
tcycle n+1 _➤
| | ^{tjit(cc) = tcycle n – tcycle n+1}
1000 Cycles
HCSL OUTPUT LOAD AC TEST CIRCUIT
Phase Noise Plot
Phase Noise Mask
f₁ ^{Offset Frequency} f₂
RMS Jitter = Area Under the Masked Phase Noise Plot
RMS PHASE JITTER
nQx
Qx
nQy
Qy
t sk(o)
CYCLE-TO-CYCLE JITTER
IDT^™ / ICS^™ HCSL CLOCK GENERATOR
HCSL OUTPUT SKEW
7
ICS841654AGI REV. A APRIL 17, 2008