SI5315 Datasheet, PDF (42/54 Pages) Silicon Laboratories – Provides jitter attenuation and frequency translation between SONET/PDH and Ethemet

Si5315
9. Typical Phase Noise Plots
The following is a typical phase noise plot. The clock input source was a Rohde and Schwarz model SML03 RF
Generator. The spectrum analyzer was either an Agilent model E5052B, model E4400A or model JS-500. The
Si5315 operates at 3.3 V with an ac coupled differential PECL output and an ac coupled differential sine wave input
from the RF generator at 0 dBm. Note that, as with any PLL, the output jitter that is below the loop BW is caused by
the jitter at the input clock, not the Si5315. Except as noted, loop BWs of 60 to 240 Hz were in use.
9.1. 10G LAN SyncE Example
0
‐20
‐40
‐60
‐80
‐100
‐120
‐140
‐160
‐180
100
Si5315 Typical Phase Noise
Fin=19.44 MHz;
Fout=125 MHz;
BW=111 Hz
Fin=19.44 MHz
Fout=156.25 MHz
BW=167 Hz
Fin=25 MHz
Fout=125 MHz
BW=111 Hz
Fin=25 MHz
Fout=156.25 MHz
BW=111 Hz
1,000
10,000
100,000
1,000,000
10,000,000
100,000,000
Frequency Plan
Fin=19.44 MHz Fin=19.44 MHz Fin=25 MHz
Fin=25 MHz
Fout=156.25 MHz Fout=125 MHz Fout=156.25 MHz Fout=125 MHz
BW=167 Hz
BW=111 Hz
BW=111 Hz
BW=111 Hz
Jitter Integration Filter Band
RMS Jitter (fs)
IEEE802.3 (1.875 to 20 MHz)
232
240
251
240
SONET OC-192 (20 kHz to 80 MHz)
483
575
525
550
SONET OC-192 (4 to 80 MHz)
302
303
300
294
SONET OC-192 (50 kHz to 80 MHz)
467
564
510
537
SONET OC-48 (12 kHz to 20 MHz)
470
565
517
541
SONET OC-3 (12 kHz to 5 MHz)
422
524
471
503
BroadBand (800 Hz to 80 MHz)
511
584
533
557
42
Rev. 1.0