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Si5346 Datasheet Preview

Si5346 Datasheet

Any-output Jitter Attenuators

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Si5347, Si5346 Revision D Reference
Manual
Quad/Dual DSPLL Any-frequency, Any-output Jitter Attenuators
Si5347, Si5346 Family Reference Manual
This Family Reference Manual is intended to provide system, PCB design, signal
integrity, and software engineers the necessary technical information to successfully
use the Si5347/46 devices in end applications. The official device specifications can be
found in the Si5347/46 data sheets.
RELATED DOCUMENTS
• Si5347/46 Rev D
Data Sheet: https://www.silabs.com/
documents/public/data-sheets/Si5347-46-
D-DataSheet.pdf
• Si5347/46 Rev D Device
Errata: https://www.silabs.com/documents/
public/errata/Si5347-46-RevD-Errata.pdf
• Si5347 Rev D -EVB User
Guide: https://www.silabs.com/documents/
public/user-guides/Si5347-D-EVB.pdf
• Si5346 Rev D -EVB User
Guide: https://www.silabs.com/documents/
public/user-guides/Si5346-D-EVB.pdf
• Si534x/8x Jitter Attenuators
Recommended Crystals, TCXO
and OCXOs Reference
Manual: https://www.silabs.com/
documents/public/reference-manuals/
si534x-8x-recommended-crystals-rm.pdf
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
1
Rev. 1.3 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • July 26, 2021
1




Skyworks

Si5346 Datasheet Preview

Si5346 Datasheet

Any-output Jitter Attenuators

No Preview Available !

Table of Contents
1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Work Flow Using ClockBuilder Pro and the Register Map. . . . . . . . . . . . . . . . 5
1.2 Family Product Comparison . . . . . . . . . . . . . . . . . . . . . . . . . 5
2. Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 DSPLL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 DSPLL Loop Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2.1 Fastlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.3 Dividers Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3. Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1 Reset and Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . .10
3.1.1 Updating Registers during Device Operation . . . . . . . . . . . . . . . . . .10
3.1.2 NVM Programming . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3.2 Free Run Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.3 Lock Acquisition Mode . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.4 Locked Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.5 Holdover Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
4. Clock Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.1 Input Source Selection . . . . . . . . . . . . . . . . . . . . . . . . . . .18
4.2 Types of Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
4.2.1 Hitless Input Switching with Phase Buildout . . . . . . . . . . . . . . . . . . .21
4.2.2 Ramped Input Switching . . . . . . . . . . . . . . . . . . . . . . . . .22
4.2.3 Hitless Switching, LOL (loss of lock) and Fastlock . . . . . . . . . . . . . . . . .22
4.2.4 External Clock Switching . . . . . . . . . . . . . . . . . . . . . . . . .22
4.2.5 Synchronizing to Gapped Input Clocks . . . . . . . . . . . . . . . . . . . .23
4.2.6 Rise Time Considerations . . . . . . . . . . . . . . . . . . . . . . . . .24
4.3 Fault Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
4.3.1 Input Loss of Signal (LOS) Detection . . . . . . . . . . . . . . . . . . . . .25
4.3.2 XA/XB LOS Detection . . . . . . . . . . . . . . . . . . . . . . . . . .26
4.3.3 OOF Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
4.3.4 LOL Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
4.3.5 Interrupt Pin (INTR) . . . . . . . . . . . . . . . . . . . . . . . . . . .31
5. Output Clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.1 Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
5.1.1 Output Crosspoint . . . . . . . . . . . . . . . . . . . . . . . . . . .32
5.1.2 Output Divider (R) Synchronization. . . . . . . . . . . . . . . . . . . . . .32
5.2 Performance Guidelines for Outputs . . . . . . . . . . . . . . . . . . . . . . .33
5.2.1 Output Crosspoint and Signal Format Selection . . . . . . . . . . . . . . . . .34
5.2.2 Output Terminations . . . . . . . . . . . . . . . . . . . . . . . . . . .35
5.3 Differential Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
2
Rev. 1.3 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • July 26, 2021
2


Part Number Si5346
Description Any-output Jitter Attenuators
Maker Skyworks
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Si5346 Datasheet PDF






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