Skyworks Si5391 - Page 3

8.4.8 Output Driver Settings for LVPECL, LVDS, HCSL, and CML .............34
8.4.9 Setting the Differential Output Driver to Non-Standard Amplitudes ...........35
8.5 Output Enable/Disable ...........................37
8.5.1 Output Driver State When Disabled .....................38
8.5.2 Synchronous Output Enable/Disable Feature ..................38
8.6 Output Buffer Supply Voltage Selection ......................38
8.7 Output Delay Control ............................39
9. Zero Delay Mode (All Si5391 Devices Except Si5391P) ............... 40
10. Digitally-Controlled Oscillator (DCO) Mode (All Si5391 Devices Except Si5391P) .... 41
10.1 Using the N Dividers for DCO Applications ....................41
10.1.1 DCO with Frequency Increment/Decrement Pins/Bits ...............41
10.1.2 DCO with Direct Register Writes ......................41
10.2 Using the M Divider for DCO Applications ....................41
11. Serial Interface ............................. 42
11.1 I
2
C Interface ..............................44
11.2 SPI Interface ..............................46
12. Crystal, XO and Device Circuit Layout Recommendations ............. 51
12.1 64-Pin QFN Si5391/Si5391P Layout Recommendations ...............51
12.1.1 Si5391 with an External Reference (Not Relevant to the Si5391P) ..........51
12.1.2 Si5391/Si5391P Crystal Guidelines .....................52
12.1.3 Si5391/Si5391P Output Clocks ......................58
13. Power Management ........................... 60
13.1 Power Management Features ........................60
13.2 Power Supply Recommendations .......................60
13.3 Power Supply Sequencing .........................61
13.4 Grounding Vias .............................61
14. Register Map .............................. 62
14.1 Base vs. Factory Preprogrammed Devices ....................62
14.2 “Base” Devices (a.k.a. “Blank” Devices) .....................62
14.3 “Factory Preprogrammed” (Custom OPN) Devices .................62
14.4 Register Map Overview and Default Settings Values .................63
15. Si5391A/B Register Map .......................... 64
15.1 Page 0 Registers Si5391 ..........................64
15.2 Page 1 Registers Si5391 ..........................73
15.3 Page 2 Registers Si5391 ..........................78
15.4 Page 3 Registers Si5391 ..........................84
15.5 Page 9 Registers Si5391 ..........................87
15.6 Page A Registers Si5341 ..........................89
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3 Rev. 0.5 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • January 11, 2022 3