CDC421XXX Datasheet, PDF (5/18 Pages) Texas Instruments – FULLY INTEGRATED FIXED FREQUENCY LOW-JITTER, CRYSTAL-OSCILLATOR CLOCK GENERATOR

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CDC421xxx
SLAS540 – APRIL 2007
JITTER CHARACTERISTICS IN INPUT CLOCK MODE
The jitter characterization test is performed using an LVCMOS input signal driving the CDC421xxx device.
0.1 mF
50 W
100 pF
XIN 1
CDC421xxx
XIN 2
150 W
150 W
Phase Noise
Analyzer
150 W
Figure 3. Jitter Test Configuration for an LVTTL Input Driving CDC421xxx
S0246-02
For the cases of the CDC421xxx being referenced by an external, clean LVCMOS input of 31.25 MHz, 33.33
MHz and 35.4167 MHz, the following tables list the measured SSB phase noise of all the outputs supported by
the CDC421xxx device, (100 MHz, 106.25 MHz, 125 MHz, 156.25 MHz, 212.5 MHz, 250 MHz, and 312.5 MHz)
from 100 Hz to 20 MHz from the carrier.
Table 3. Phase Noise Parameters With LVCMOS Input of 33.3333 MHz and LVPECL Output at 100.00 MHz
PARAMETER
Phase Noise Specifications Under Following Conditions: f_in = 33.3333 MHz, f_out = 100.00 MHz
phn₁₀₀
Phase noise at 100 Hz
phn_1K
Phase noise at 1 kHz
phn_10k
Phase noise at 10 kHz
phn_100k
Phase noise at 100 kHz
phn_1M
Phase Noise at 1 MHz
phn_10M
Phase noise at 10 MHz
phn_20M
Phase noise at 20 MHz
J_RMS
RMS jitter integrated from 12 kHz to 20 MHz
Tj
Total jitter
Dj
Deterministic jitter
MIN TYP
–111
–121
–131
–133
–142
–149
–149
507
35.33
11.54
MAX UNIT
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
fs
ps
ps
Table 4. Phase Noise Parameters With LVCMOS Input of 35.4167 MHz and LVPECL Output at 106.25 MHz
PARAMETER
Phase Noise Specifications Under Following Conditions: f_in= 35.4167 MHz , f_out = 106.25 MHz
phn₁₀₀
Phase noise at 100 Hz
phn_1K
Phase noise at 1 kHz
phn_10k
Phase noise at 10 kHz
phn_100k
Phase noise at 100 kHz
phn_1M
Phase noise at 1 MHz
phn_10M
Phase noise at 10 MHz
phn_20M
Phase noise at 20 MHz
J_RMS
RMS jitter integrated from 12 kHz to 20 MHz
Tj
Total jitter
Dj
Deterministic jitter
MIN TYP
–112
–121
–125
–129
–142
–151
–151
530
30.39
11
MAX UNIT
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
fs
ps
ps
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