SI5325C-C-GM Datasheet, PDF (157/178 Pages) Silicon Laboratories – ANY-FREQUENCY PRECISION CLOCKS

APPENDIX H—JITTER ATTENUATION AND LOOP BW
Si53xx-RM
The following illustrates the effects of different loop BW values on the jitter attenuation of the Any-Frequency
devices. The jitter consists of sine wave modulation at varying frequencies. The RMS jitter values of the modulated
sine wave input is compared to the output jitter of an Si5326 and an Si5324. For reference, the top entry in the
table lists the jitter without any modulation. For each entry in the table, the corresponding phase noise plots are
presented.
Table 74. Jitter Values
Fmod
Fdev
Jitter Start
RF Gen
Si5326
Si5324
0
50 Hz
0
50 Hz
500 Hz
10 Hz
1.18 ps
181 ps
283 fs
169 ps
281 fs
10.6 ps
100 Hz
100 Hz
50 Hz
177 ps
136 ps
500 Hz
500 Hz
100 Hz
175 ps
18.6 ps
1 kHz
1 kHz
500 Hz
184 ps
4.28 ps
5 kHz
5 kHz
500 Hz
138 ps
297 fs
10 kHz
10 kHz
500 Hz
139 ps
302 fs
Notes:
1. All phase noise plots are with 622.08 MHz input and 622.08 MHz output.
Si5326 bandwidth = 120 Hz; Si5324 bandwidth = 7 Hz.
2. FM modulation at F = Fmod with modulation amplitude = Fdev.
3. Jitter start is the start of the brick wall integration band. All integration bands end at 50 MHz.
4. Phase noise measured by Agilent model E5052B.
5. RF Generator was Rohde and Schwarz model SML03.
2.04 ps
295 fs
292 fs
302 fs
304 fs
Rev. 1.2
157