
843081AGI-01
www.idt.com
REV. C JULY 25, 2010
5
ICS843081I-01
FEMTOCLOCKSCRYSTAL-TO-
3.3V, 2.5V LVPECL CLOCK MULTIPLIER
TYPICAL PHASE NOISE AT 625MHZ @ 3.3V
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
200
625MHz
RMS Phase Jitter (Random)
1.875MHz to 20MHz = 0.32ps (typical)
OFFSET FREQUENCY (HZ)
N
OISE
P
OWER
dBc
Hz
625MHz
RMS Phase Jitter (Random)
1.875MHz to 20MHz = 0.39ps (typical)
OFFSET FREQUENCY (HZ)
N
OISE
P
OWER
dBc
Hz
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
200
TYPICAL PHASE NOISE AT 625MHZ @ 2.5V
10
100
1k
10k
100k
1M
10M
100M
10
100
1k
10k
100k
1M
10M
100M
Phase Noise Result by adding
a Gb Ethernet Filter to raw data
Raw Phase Noise Data
Gb Ethernet Filter
Phase Noise Result by adding
a Gb Ethernet Filter to raw data
Raw Phase Noise Data
Gb Ethernet Filter