Silicon Laboratories SI5319 Si5374, Si5375 Crosstalk Test Bed, Si5374/75 Crosstalk Jitter Values

Si53xx-RM

APPENDIX J—Si5374AND Si5375 CROSSTALK

While the four DSPLLs of the Si5374 and Si5375 are in close physical and electrical proximity to one another, crosstalk interference between the DSPLLs is minimal. The following measurements show typical performance levels that can be expected for the Si5374 and Si5375 when all four of their DSPLLs are operating at frequencies that are close in value to one another, but not exactly the same.

Si5374, Si5375 Crosstalk Test Bed

All four DSPLLs share the same frequency plan:

38.88 MHz input.

38.88 MHz x 4080 / 227 = 698.81 MHz output (rounded). There are four slightly different input frequencies:

DSPLL A: 38.88 MHz + 0 ppm => 38.88000000 MHz

DSPLL B: 38.88 MHz + 1 ppm => 38.88003888 MHz

DSPLL C: 38.88 MHz + 10 ppm => 38.88038880 MHz

DSPLL D: 38.88 MHz + 20 ppm => 38.88077760 MHz

Table 83. Si5374/75 Crosstalk Jitter Values

DSPLL	Jitter, fsec RMS
A	334
B	327
C	358
D	331

OSC_P, OSC_N Reference:

Si530 at 121.109 MHz Test equipment:

Agilent E5052B

Rev. 0.5 173