ICS841664I Datasheet, PDF (7/16 Pages) Integrated Device Technology – FEMTOCLOCK™ CRYSTAL-TO-HCSL CLOCK GENERATOR

ICS841664I
FEMTOCLOCK™ CRYSTAL-TO-HCSL CLOCK GENERATOR
PARAMETER MEASUREMENT INFORMATION
PRELIMINARY
3.3V±5%
3.3V±5%,
V_DD,
V_DDOA,
V_DDOB
VDDA
HSCL
GND
475Ω
33Ω
50Ω
Measurement
Point
50Ω
33Ω
50Ω
Measurement
Point
50Ω
0V
3.3V HCSL OUTPUT LOAD AC TEST CIRCUIT
nQx
Qx
nQy
Qy
t sk(o)
HCSL OUTPUT SKEW
REF_OUT
t _PW
V
DDO
2
t
PERIOD
odc = ^{t PW} x 100%
t _PERIOD
LVCMOS OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
20%
REF_OUT
80%
t_R
LVCMOS OUTPUT RISE/FALL TIME
80%
t_F
20%
1.65V±5%
1.65V±5%
V
DD
VDDA
LVCMOS
GND
SCOPE
Qx
-1.65V±5%
3.3V LVCMOS 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
nQA0, nQA1,
nQB0, nQB1
QA0, QA1,
QB0, QB1
t _PW
t
PERIOD
odc = ^{t PW} x 100%
t _PERIOD
HCSL OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
nQA0, nQA1,
nQB0, nQB1
0.525V
0.525V
QA0, QA1, _0.175V
QB0, QB1
t_R
t_F
V_{SW I N G}
0.175V
HCSL OUTPUT RISE/FALL TIME
IDT^™ / ICS^™ HCSL CLOCK GENERATOR
7
ICS841664AGI REV. A JANUARY 30, 2009