ICS841608I Datasheet, PDF (6/17 Pages) Integrated Device Technology – FEMTOCLOCKS CRYSTAL-TO-HCSL CLOCK GENERATOR VCO: 500MHz

ICS841608I
FEMTOCLOCKS™ CRYSTAL-TO-HCSL CLOCK GENERATOR
PARAMETER MEASUREMENT INFORMATION
3.3V±5%
3.3V±5%,
V_DD
VDDA
HCSL
IREF
GND
475Ω
33Ω
33Ω
0V
100Ω
Measurement
Point
49.9Ω
100Ω
2pF
Measurement
Point
49.9Ω
2pF
3.3V HCSL OUTPUT LOAD AC TEST CIRCUIT
nQx
Qx
nQy
Qy
t sk(o)
OUTPUT SKEW
3.3V±5%
3.3V±5%,
V
DD
VDDA
50Ω
HCSL
50Ω
IREF
GND
475Ω
SCOPE
0V
This load condition is used for I , tsk(o), and tjit measurements.
DD
3.3V 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
Rise Edge Rate
+150mV
0.0V
-150mV
Q - nQ
Fall Edge Rate
DIFFERENTIAL MEASUREMENT POINTS FOR RISE/FALL TIME
+150mV
VRB = +100mV
0.0V
VRB = -100mV
-150mV
Q - nQ
T_STABLE
V_RB
T_STABLE
V_RB
DIFFERENTIAL MEASUREMENT POINTS FOR RINGBACK
IDT^™ / ICS^™ HCSL CLOCK GENERATOR
6
ICS841608AKI REV. A JUNE 18, 2008