Silicon Laboratories SI5351A/B/C manual

Si5351A/B/C

VDDSi5351B

XA		PLL
	OSC	PLL
	OSC
XB
		VCXO
VC

SDA	I2C
SCL	Interface
SCL

OEB Control

SSEN Logic

MultiSynth

VDDOA

CLK0 CLK1

VDDOB

CLK2 CLK3

VDDOC

CLK4 CLK5

VDDOD

CLK6 CLK7

GND

VDD

20-QFN, 24-QSOP

Si5351C

XA

	OSC	PLL
		PLL
XB		A





		PLL
CLKIN		B

SDA

I2C

SCL Interface

INTR

OEB			Control
			Control
			Logic
			Logic

MultiSynth

VDDOA

CLK0 CLK1

VDDOB

CLK2 CLK3

VDDOC

CLK4 CLK5

VDDOD

CLK6 CLK7

GND

20-QFN, 24-QSOP

Figure 2. Block Diagrams of Si5351B and Si5351C 8-Output Devices

10	Preliminary Rev. 0.95

Page 10

Image 10

SI5351A/B/C specifications

Silicon Laboratories SI5351A/B/C is a versatile, low-power clock generator and frequency synthesizer that has gained widespread popularity in various applications, including telecommunications, consumer electronics, and industrial control systems. These devices are primarily designed to provide precise clock frequency generation with low phase noise and jitter, making them ideal for high-performance applications.

One of the standout features of the SI5351 is its ability to generate multiple output frequencies simultaneously. Capable of producing up to three independent programmable outputs, the SI5351A/B/C can generate frequencies ranging from 8 kHz to 160 MHz. With its integrated phase-locked loop (PLL) technology, it achieves excellent frequency stability and accuracy, simplifying the design of frequency-dependent systems.

The device operates under a supply voltage range of 1.8V to 3.6V, allowing it to be used in battery-powered applications without excessive power consumption. The SI5351’s low current draw, typically as low as 25 mA, is especially beneficial in portable devices, extending battery life and enhancing overall efficiency. Furthermore, it features a programmable output driver, which can be set to various drive strengths, ensuring compatibility with a wide array of load requirements.

Configuration and control of the SI5351 are user-friendly, implemented via an I2C interface. This allows for straightforward integration into microcontroller-based designs. Moreover, the device includes an on-chip memory that stores settings, which streamlines the reconfiguration process when power cycling, minimizing setup time for developers.

Another significant advantage of the SI5351A/B/C is its output jitter performance, which is typically below 1 ps, resulting in clean output signals essential for high-speed data communications and precise timing applications. The SI5351’s integration of multiple synthesizer stages contributes to its impressive phase noise characteristics, making it suitable for demanding RF applications.

Additionally, the SI5351 devices offer programmable frequency stepping, allowing users to define custom frequency increments, which is particularly useful in applications requiring precise tuning or modulation. This flexibility, combined with its compact size and simple interface, makes the SI5351A/B/C an ideal choice for engineers seeking a reliable, cost-effective solution for generating clock signals in a myriad of electronic systems.

In summary, Silicon Laboratories SI5351A/B/C provides a robust, low-power solution for high-precision clock generation, characterized by its programmable outputs, low jitter, easy configurability, and broad frequency range, making it an excellent choice for both commercial and industrial applications across various sectors.

Contents

Applications FeaturesFunctional Block Diagram Description Si5351A/B/C Table of Contents Parameter Symbol Test Condition Min Typ Max Unit Electrical SpecificationsDC Characteristics Recommended Operating Conditions Vcxo Specifications Si5351B only AC CharacteristicsInput Clock Characteristics Parameter Symbol Test Condition Min Typ Max Units Parameter Symbol Min Typ Max Unit Output Clock CharacteristicsCrystal Requirements1,2 Thermal Characteristics I2C Specifications SCL,SDA1Parameter Symbol Test Condition Package Value Unit Parameter Symbol Test Condition Value Unit Absolute Maximum Ratings1 Detailed Block Diagrams Block Diagrams of 3-Output and 8-Output Si5351A Devices Block Diagrams of Si5351B and Si5351C 8-Output Devices Input Stage Functional DescriptionCrystal Inputs XA, XB External Clock Input Clkin Synthesis StagesOutput Stage Voltage Control Input VC Spread Spectrum Enable SSEN-Si5351A and Si5351B only Control Pins OEB, SsenOutput Enable OEB Spread Spectrum I2C and Control Signals I2C Interface I2C Write Operation Writing a Custom Configuration to RAM Configuring the Si5351Power-Up I2C Programming Procedure Si5351 Application Examples Replacing Crystals and Crystal Oscillators Si5351B Replacing Crystals, Crystal Oscillators, and VCXOsReplacing Crystals, Crystal Oscillators, and PLLs Si5351C Replacing a Crystal with a Clock Hcsl Compatible Outputs Design Considerations Trace Characteristics Register Map Summary Register CLK0PHOFF70 Register Descriptions System Calibration Status Sticky Bit Clkin Loss Of Signal Sticky Bit Si5351C OnlyRegister 1. Interrupt Status Sticky Pllb Loss Of Lock Status Sticky Bit System Initialization Status Mask Clkin Loss Of Signal Mask Si5351C OnlyRegister 2. Interrupt Status Mask Pllb Loss Of Lock Status Mask Register 9. OEB Pin Enable Control Register 3. Output Enable ControlOutput Disable for CLKx OEB pin enable control of CLKx Register 15. PLL Input Source Pllbsrc Register 16. CLK0 Control Clock 0 Power DownMultiSynth 0 Integer Mode Bit Name Function Register 17. CLK1 Control Clock 1 Power DownMultiSynth 1 Integer Mode MultiSynth Source Select for CLK1 Register 18. CLK2 Control Clock 2 Power DownMultiSynth 2 Integer Mode MultiSynth Source Select for CLK2 Register 19. CLK3 Control Clock 3 Power DownMultiSynth 3 Integer Mode MultiSynth Source Select for CLK3 Register 20. CLK4 Control Clock 4 Power DownMultiSynth 4 Integer Mode MultiSynth Source Select for CLK4 Register 21. CLK5 Control Clock 5 Power DownMultiSynth 5 Integer Mode MultiSynth Source Select for CLK5 Register 22. CLK6 Control Clock 7 Power DownFBA MultiSynth Integer Mode MultiSynth Source Select for CLK6 MultiSynth Source Select for CLK7 FBB MultiSynth Integer ModeRegister 23. CLK7 Control Output Clock 7 Invert Register 25. CLK7-4 Disable State Register 24. CLK3-0 Disable StateBit Name Function CLKxDISSTATE Clock x Disable State Clock x Disable State Register 42. Multisynth0 Parameters Bit MS0P3158 Type Reset valueMS0P370 R0 Output Divider Register 44. Multisynth0 Parameters BitRegister 45. Multisynth0 Parameters Bit MS0P31916 MS0P21916 Register 46. Multisynth0 Parameters BitMS0P170 MS0P2158 MS1P3158 Register 49. Multisynth0 Parameters BitMS0P270 MS1P370 R1 Output Divider Register 52. Multisynth1 Parameters BitRegister 53. Multisynth1 Parameters Bit Register 54. Multisynth1 Parameters Bit Name MS1P170 MS1P31916 MS1P21916 Register 57. Multisynth1 Parameters Bit MS1P270 Multisynth2 Parameter Register 60. Multisynth2 Parameters BitR2 Output Divider Register 61. Multisynth2 Parameters Bit Register 62. Multisynth2 Parameters Bit Name MS2P170 MS2P31916 MS2P21916 MS3P3158 Register 65. Multisynth2 Parameters BitMS2P270 MS3P370 R3 Output Divider Register 68. Multisynth3 Parameters BitRegister 69. Multisynth3 Parameters Bit Register 70. Multisynth3 Parameters Bit Name MS3P170 MS3P31916 MS3P21916 MS4P3158 Register 73. Multisynth3 Parameters BitMS3P270 MS4P370 R4 Output Divider Register 76. Multisynth4 Parameters BitRegister 77. Multisynth4 Parameters Bit Register 78. Multisynth4 Parameters Bit Name MS4P170 MS4P31916 MS4P21916 MS5P3158 Register 81. Multisynth4 Parameters BitMS4P270 MS5P370 R5 Output Divider Register 84. Multisynth5 Parameters BitRegister 85. Multisynth5 Parameters Bit Register 86. Multisynth5 Parameters Bit Name MS5P170 MS5P31916 MS5P21916 MS6P170 Register 89. Multisynth5 Parameters BitMS5P270 MS7P170 R7 Output Divider Register 92. Clock 6 and 7 Output Divider BitR6 Output Divider Register 166. CLK1 Initial Phase Offset Register 165. CLK0 Initial Phase OffsetClock 0 Initial Phase Offset Clock 1 Initial Phase Offset Register 169. CLK4 Initial Phase Offset Register 168. CLK3 Initial Phase OffsetClock 3 Initial Phase Offset Clock 4 Initial Phase Offset PLLAReset Register 177. PLL ResetPLLBReset Register 183. Crystal Internal Load Capacitance Si5351A Pin Descriptions Si5351A Pin Descriptions 20-Pin QFN, 24-Pin QsopPin Name Pin Number Pin Type Function 20-QFN 10. Si5351B Pin Descriptions 20-Pin QFN, 24-Pin Qsop Si5351B Pin Descriptions 11. Si5351C Pin Descriptions 20-Pin QFN, 24-Pin Qsop Si5351C Pin Descriptions Pin 12. Si5351A Pin Descriptions 10-Pin MsopSi5351A 10-MSOP Pin Descriptions Number Ordering Information Si5351X Device Part Numbers Dimension Min Nom Max Qsop Package DimensionsPackage Outline 24-Pin Qsop Dimension Min Nom Package DimensionsPackage Outline 20-Pin QFN Package Outline 10-Pin Msop Ddd Revision 0.1 to Revision Revision 0.9 to Revision Si5351A/B/C Contact Information

Silicon Laboratories SI5351A/B/C Block Diagrams of Si5351B and Si5351C 8-Output Devices

Models: SI5351A/B/C

Si5351A/B/C

VDDSi5351B

VCXO

20-QFN, 24-QSOP

Si5351C

Figure 2. Block Diagrams of Si5351B and Si5351C 8-Output Devices

SI5351A/B/C specifications