
IDT / ICS HCSL CLOCK GENERATOR
6
ICS841602AGI REV. A JULY 10, 2008
ICS841602I
FEMTOCLOCKS CRYSTAL-TO-HCSL CLOCK GENERATOR
PARAMETER MEASUREMENT INFORMATION
OUTPUT SKEW
3.3V HCSL OUTPUT LOAD AC TEST CIRCUIT
RMS PHASE JITTER
Phase Noise Mask
Offset Frequency
f
1
f
2
Phase Noise Plot
RMS Jitter = Area Under the Masked Phase Noise Plot
Noise
P
o
w
er
tsk(o)
Qy
Qx
nQy
nQx
DIFFERENTIAL MEASUREMENT POINTS FOR RISE/FALL TIME
475
Ω
Measurement
Point
33
Ω
100
Ω
100
Ω
33
Ω
Measurement
Point
49.9
Ω
49.9
Ω
HCSL
GND
2pF
0V
IREF
3.3V±5%
V
DD
3.3V±5%,
VDDA
DIFFERENTIAL MEASUREMENT POINTS FOR RINGBACK
Q - nQ
-150mV
+150mV
0.0V
Fall Edge Rate
Rise Edge Rate
T
STABLE
T
STABLE
V
RB
V
RB
Q - nQ
-150mV
VRB = -100mV
VRB = +100mV
+150mV
0.0V
This load condition is used for I
DD
,
tsk(o), and tjit measurements.
475
Ω
50
Ω
50
Ω
HCSL
GND
0V
SCOPE
IREF
3.3V±5%
V
DD
3.3V±5%,
VDDA