SI5325C-C-GM Datasheet, PDF (167/178 Pages) Silicon Laboratories – ANY-FREQUENCY PRECISION CLOCKS

Si53xx-RM
APPENDIX K—Si5374, Si5375, AND Si5376 CROSSTALK
While the four DSPLLs of the Si5374, Si5375, and Si5376 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, Si5375, and Si5376 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, and Si5376 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 75. Si5374/75/76 Crosstalk Jitter Values
DSPLL
A
B
C
D
Jitter, fsec RMS
334
327
358
331
OSC_P, OSC_N Reference:
 Si530 at 121.109 MHz
Test equipment:
 Agilent E5052B
Rev. 1.2
167