CDCD5704 Datasheet, PDF (11/17 Pages) Texas Instruments – Rambus TM XDR TM CLOCK GENERATOR

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CDCD5704
SCAS823 – DECEMBER 2006
PHASE NOISE
For the offset frequency range from 1 MHz to 100 MHz, phase noise of the CDCD5704 does not exceed the
single-sideband phase noise (spectral purity) described by the following equation given by Rambus.
L(f) = 10 log [1 + (50 × 10⁶ / f)^2.4] – 138 dBc/Hz
Selected numerical values are in given in the following table.
f = offset frequency
L(f) = SSB phase noise
1 (L₁)
–97
5
–114
10
–121
15
–125
20 (L₂₀)
–128
40
–134
80
–137
100
–138
MHz
dBc/Hz
−80
Rambus Spec Range:
−90
1 MHz 3 f_Offset 3 20 MHz
−100
−110
667 MHz
−120
−130
−140
300 MHz
400 MHz
Rambus Spec
−150
−160
100k
1M
10M
f_Offset − Offset Frequency − Hz
20M
Figure 2. Phase Noise Plot
100M
G001
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