Low-Jitter Frequency Synthesizer
with Selectable Input Reference
(VCC = 3.3V, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
PHASE NOISE AT 61.44MHz
-60
RANDOM JITTER = 0.41psRMS
-70 INTEGRATED 12kHz TO 20MHz
-80
-90
-100
-110
-120
-130
-140
-150
-160
100
1k 10k 100k 1M 10M 100M
OFFSET FREQUENCY (Hz)
PHASE NOISE AT 122.88MHz
-60
RANDOM JITTER = 0.29psRMS
-70 INTEGRATED 12kHz TO 20MHz
-80
-90
-100
-110
-120
-130
-140
-150
-160
100
1k 10k 100k 1M 10M 100M
OFFSET FREQUENCY (Hz)
PHASE NOISE AT 153.6MHz
-60
RANDOM JITTER = 0.28psRMS
-70 INTEGRATED 12kHz TO 20MHz
-80
-90
-100
-110
-120
-130
-140
-150
-160
100
1k 10k 100k 1M 10M 100M
OFFSET FREQUENCY (Hz)
PHASE NOISE AT 245.76MHz
-60
RANDOM JITTER = 0.27psRMS
-70 INTEGRATED 12kHz TO 20MHz
-80
-90
PHASE NOISE AT 307.2MHz
-60
RANDOM JITTER = 0.28psRMS
-70 INTEGRATED 12kHz TO 20MHz
-80
-90
JITTER TRANSFER
5
0
-5
-100
-100
-10
-110
-110
-120
-120
-15
-130
-130
-20
-140
-140
-25
-150
-150
-160
100 1k 10k 100k 1M 10M 100M
-160
100 1k 10k 100k 1M 10M 100M
-30
1k
10k
100k
1M
OFFSET FREQUENCY (Hz)
OFFSET FREQUENCY (Hz)
JITTER FREQUENCY (Hz)
DIFFERENTIAL OUTPUT WAVEFORM
AT 153.6MHz
MAX3673 toc07
DIFFERENTIAL OUTPUT WAVEFORM
AT 307.2MHz
MAX3673 toc08
200mV/div
200mV/div
800ps/div
400ps/div
REFERENCE CLOCK AMPLITUDE DETECTION
ASSERT THRESHOLD vs. INPUT FREQUENCY
330
310
290
INPUT RISE/FALL TIME = 550ps
270
250
230
210
190
INPUT RISE/FALL TIME = 270ps
170
150
130
50 100 150 200 250 300 350
REFERENCE CLOCK INPUT FREQUENCY (MHz)
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