Skyworks Si5361 Reference Manual

Hide thumbs Also See for Si5361:

Reference manual (46 pages)

Table Of Contents

Table of Contents

Quick Links

Download this manual

Si5361/62/63 Reference Manual

Any-frequency, Any-output Jitter-Attenuators/Clock Multipliers

Si5361/62/63 Family Reference Manual

This Family Reference Manual is intended to provide hardware, system, and software

engineers the necessary technical information to successfully use the Si5361/62/63

in end applications. The official device specifications and ordering information can be

found in the Si5361/62/63 data sheets.

The Si5361/62/63 jitter attenuating clock multipliers combine fifth-generation DSPLL and

MultiSynth™ technologies to enable any-frequency clock generation. These parts are

used for applications that require the highest level of jitter performance. The Si5361,

Si5362, and Si5363 are 1-, 2-, and 3-DSPLL devices, respectively. These devices are

programmable with a serial interface. Alternatively, on-chip, programmable, non-volatile

memory (NVM) can be used to ensure powerup with known frequency configurations.

Free-run, synchronous, and holdover modes of operation are supported offering both

automatic and manual input clock switching. The loop filter is fully integrated on-chip

eliminating the risk of potential noise coupling associated with discrete solutions. Fur-

ther, the jitter attenuation bandwidth is digitally programmable providing jitter perform-

ance optimization at the application level. These devices are capable of generating any

combination of output frequencies from any input frequency within the specified input

and output range.

The Si5361/62/63 is programmed using Skyworks ClockBuilder software and can be

made to power up with known frequencies as a factory programmed custom part, or can

be ordered as a "custom blank" part for increased flexibility.

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

206420A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 7, 2022

Need help?

Do you have a question about the Si5361 and is the answer not in the manual?

Questions and answers

Summary of Contents for Skyworks Si5361

Page 1 "custom blank" part for increased flexibility. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 206420A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 7, 2022...
Page 2: Table Of Contents
....5 2. Use Cases with the Si5361/62/63 Jitter Attenuator Applications ... . 6 2.1 Si5361 Application Example .
Page 3 14.1 Custom Programmed Parts ......44 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 206420A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 7, 2022...
Page 4 17. Revision History......Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 206420A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 7, 2022...
Page 5: Introduction To The Si5361/62/63 And Clockbuilder Pro
ClockBuilder Pro software is used to create a frequency plan and a custom programmed or custom blank orderable part number (OPN) for the Si5361/62/63 jitter attenuator. During operation, the Device API embedded on the clock devices may be used to dynamically adjust or poll the Si5361/62/63 parameters.
Page 6: Use Cases With The Si5361/62/63 Jitter Attenuator Applications
3. Jitter cleaner The image below shows the Si5361 used in a typical SyncE architecture as a line card device. It also shows Skywork's Si540x device acting as a timing card to distribute timing information from different Building Integrated Timing Supplies (BITS).
Page 7: Si5362/63 Application Examples
Figure 2.2. Si5362/63 as SyncE Line Card Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 206420A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 7, 2022...
Page 8 Note: When multiple inputs are assigned to DSPLLP, switching between them will affect all device outputs. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 206420A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 7, 2022...
Page 9: Si5363 Application Example
Note: When multiple inputs are assigned to DSPLLP, switching between them will affect all device outputs. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 206420A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 7, 2022...
Page 10: Dspll And Multisynth
Figure 3.1. Si5361 Detailed Block Diagram Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 206420A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 7, 2022...
Page 11 Figure 3.2. Si5362 Detailed Block Diagram Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 206420A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 7, 2022...
Page 12 Figure 3.3. Si5363 Detailed Block Diagram Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 206420A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 7, 2022...
Page 13: Dividers
3.3.1 VCO Frequency Range In the Si5361/62/63, the VCO frequency range is 10.4 GHz to 13.0 GHz. The output delay (skew) adjustment range will vary depending on VCO frequency used in the plan. To find the specific fVCO used in a frequency plan, see the ClockBuilder Pro Design Report.
Page 14: Modes Of Operation
4. Modes of Operation Once initialization is complete, each of the PLLs of the Si5361/62/63 operates independently in one of four modes: Free-run Mode, Lock Acquisition Mode, Locked Mode, or Holdover Mode. A state diagram showing the modes of operation is shown in the figure below.
Page 15: Lock Acquisition Mode
If ramped holdover exit is disabled, the holdover exit is governed either by (1) the PLL loop BW or (2) the PLL Fastlock bandwidth, when enabled. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 206420A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 7, 2022...
Page 16: Dynamic Frequency Changes
For larger frequency changes, Frequency-On-The-Fly (FOTF) may be used. The FOTF is a software function that enables the Si5361/62/63 to change to a subset of clock outputs while leaving others unchanged. For more information on FOTF operation, see the application note "AN1368: Si536x FOTF Guide".
Page 17: Zero Delay Mode (Zdm)
Note: ZDM cannot be used on a PLL when DCO is enabled on its M feedback divider Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 206420A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 7, 2022...
Page 18: Reference Inputs
7. Reference Inputs The Si5361/62/63 operates from either a fixed-frequency crystal (XTAL) connected to the XA, XB pins or an external crystal oscillator (XO) connected to the OSC pins. The internal oscillator (OSC) combined with a low cost external XTAL produces an ultra low jitter reference clock for the DSPLL.
Page 19: Input Clocks
PHRD_FB inputs can be used to compare an externally fed-back output of the Si5361/62/63 to an input of known phase. These inputs can use the same alarms such as LOS/OOF/PHMON as the other clock inputs but they are not assigned to a PLL.
Page 20: Automatic Input Selection
Buildout (PBO) or a Phase Pull-in (PPI) switch. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 206420A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 7, 2022...
Page 21 Figure 8.2. Difference between PBO and PPI Input Switching Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 206420A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 7, 2022...
Page 22: Output Clocks
Si5361/62/63 Reference Manual • Output Clocks 9. Output Clocks The Si5361/62/63 supports up to 18 differential outputs. Each output may be independently configured to support any one of multiple signal formats including LVDS, S-LVDS, ac-coupled LVPECL, HCSL, CML, and custom differential. The custom differential output format supports a programmable amplitude from 200–800 mVpp_se.
Page 23: Differential Outputs
LVCMOS or SRL CMOS output. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 206420A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 7, 2022...
Page 24: Output Enable/Disable
9.3 Output Enable/Disable Each ouput clock driver of the Si5361/62/63 may be enabled/disabled through either programmable GPIO pins or the Device API command, ENABLE_OUTPUT. There is flexibility in the Si5361/62/63 Output Enable, and care should taken to understand the various settings.
Page 25: State Of Disabled Output
Figure 9.2. Disabled Output Example: LVDS with Stop Low Setting Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 206420A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 7, 2022...
Page 26: Status And Alarms
10. Status and Alarms The Si5361/62/63 monitors the input clocks and reference input for status and alarms. These states and alarms provide the internal state machine with real time phase and frequency monitoring used for making decisions such as switching inputs.
Page 27: Status Monitoring
- PLL Loop Filter Status: Ramp, Fast Lock, Initial Lock The Si5361/2/3 Device API has several commands useful to monitor the status of the input and DSPLLs. For a complete list of commands, see the Device API documentation available from ClockBuilder Pro.
Page 28: Loss Of Signal (Los)
Figure 10.2. LOS Short/Long Period Thresholds Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 206420A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 7, 2022...
Page 29: Out Of Frequency (Oof)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 206420A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 7, 2022...
Page 30: Phase Monitor (Phmon)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 206420A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 7, 2022...
Page 31: Short Term Holdover
Figure 10.5. LOL Diagram for each DSPLL on Si5361/62/63 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 206420A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 7, 2022...
Page 32: Frequency Loss Of Lock (Flol)
LOL clear threshold. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 206420A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 7, 2022...
Page 33: Phase Loss Of Lock (Plol)
• Accumulated amount of cycle slips (total count pos – total count neg) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 206420A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 7, 2022...
Page 34: External Reference Status
10.3.5 External Reference Status An external reference must always be provided to the device. The Si5361/62/63 will monitor the external reference input for: • Loss-of-Signal - No signal is detected at the REF_IN/REF_INb pin for oscillators or XA/XB pin for crystals.
Page 35: Gpio (General Purpose Input/Output)
11. GPIO (General Purpose Input/Output) The Si5361/62/63 has dedicated GPIO pins as well as dedicated serial interface pins. Each GPIO pin may be programmed from a list of available functions. GPIO3 can be used as a GPIO pin, if not already used as A1 or SDO for the serial interface. Therefore, the GPIO functionality of the Si5361/62/63 can be customized to best serve the user's application.
Page 36: Gpio Pin Function Descriptions
(either deliberately or due to a glitch on the line), the part may hang indefinitely in reset. To recover, power cycle the device. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 206420A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 7, 2022...
Page 37: Serial Interface
Si5361/62/63 Reference Manual • Serial Interface 12. Serial Interface Configuration and operation of the Si5361/62/63 is controlled by using the Device API to communicate via the primary I C or SPI serial interface. The interface mode is stored in device non-volatile memory for automatic configuration upon startup or reset. During the process of creating an orderable part number OPN, the serial interface selection mode is selected by the user in ClockBuilder Pro.
Page 38 Figure 12.3. SPI 4-Wire Device API Command Write The Si5361/62/63 is programmed using the Si536x Device API, which is a listing of commands and responses following operations from the Device API documentation. The host controller will write a command byte along with the argument bytes to perform various allowed listed transactions.
Page 39 CTS is bit 7 of the Status byte, which is the first byte in the device response. The CTS flag will be automatically cleared by the MCU on the Si5361/62/63 when it receives the command from the host and will be held low until the MCU processes the command, sends a response, and then sets the CTS bit.
Page 40: I 2 C Interface
Now, if the host controller needs to perform a write operation, then it continues sending data on the SDA line and if a read operation is performed, then the Si5361/62/63 device sends its data on the SDA line. Any number of data bytes may be transferred in single transaction.
Page 41 C Command Write Transaction C Read: Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 206420A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 7, 2022...
Page 42 Si5361/62/63 Reference Manual • Serial Interface The host controller reads the response from the Si5361/62/63 device by reading from the MCU portal address: 0x0FF0. This address should be written with a little endian (LE) bit order. Note the Read Command is the same command value as the Write Command above.
Page 43: Power Supplies & Voltage Detection
13.7 Low Power Mode In Low Power Mode the analog core supply voltage (VDDA) of the Si5361/62/63 is set to 1.8V in order to reduce power consumption. VDDA must be greater than or equal to the highest voltage applied to the device; therefore, in Low Power Mode all voltage supplies must be powered from 1.8V, including the clock output driver supply voltage (VDDO).
Page 44: Custom Programmed Parts Vs. Custom Blank Parts
A custom blank part has NVM that contains calibration data (trim) and metadata (device personality). When power is applied to a Si5361/62/63 custom blank part, it will not boot up or generate any output frequencies since it does not contain any firmware or user configuration data.
Page 45: Work Flow Using Clockbuilder Tm Pro (Cbpro Tm ) And The Application Programming Interface (Device Api)
Device API interface via the ClockBuilder Pro EVB GUI. Once the frequency plan is finalized, the product firmware image and user frequency plan can be exported via ClockBuilder Pro into boot files. The boot files are passed to the Si5361/62/63 via the HOST_LOAD API command to configure a device in-system.
Page 46: Application Programming Interface (Device Api)
For more information on using the Device API, see AN1360: Serial Communications and API Programming Guide for Si536x, Si540x, and Si55xx Devices. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 206420A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 7, 2022...
Page 47: Revision History
November, 2021 • Initial Release. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 206420A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 7, 2022...
Page 48 Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a service to its customers and may be used for informational purposes only by the customer.

This manual is also suitable for:

Si5362 Si5363