Silabs公司的Si5332是低功耗6/8/12路輸出可編時鐘發生器,采用靈活的頻率合成技術,可產生具有極好抖動性能(230 fs rms)的任何組合的輸出頻率,差分輸出頻率5-312.5MHz, LVCMOS輸出頻率5-170MHz,每個輸出格式為LVDS, LVPECL, HCSL,LVCMOS,工作溫度–40 到 +85℃,主要用在服務器,存儲器和搜索加速器,以太網交換和路由器,打印圖像,通信,廣播視頻,測試測量以及小型蜂窩,移動網絡.本文介紹了Si5332主要特性,6/8/12路輸出功能框圖,以及評估板Si5332-12EX-EVB框圖和電路圖,材料清單和PCB設計圖.

Highly Integrated, Low-Power Clock ICs from Silicon Labs Simplify Timing for Demanding 10/25/100G DesignsBased on Silicon Labs proprietary MultiSynth? flexible frequency synthesis technology,the Si5332 generates any combination of output frequencies with excellent jitter performance(230 fs rms). The device ’s highly flexible architecture enables a single device togenerate a wide range of integer and non-integer related frequencies on up to 12 differentialclock outputs with 0 ppm frequency synthesis error. The device offers multiplebanks of outputs that can each be tied to independent voltages, enabling usage in mixed-supply applications. Further, the signal format of each clock output is user-configurable.

Given its frequency, format, and supply voltage flexibility, the Si5332 is ideallysuited to replace multiple clock ICs and oscillators with a single device.The Si5332 is quickly and easily configured using ClockBuilder Pro? software. Clock-Builder Pro assigns a custom part number for each unique configuration. Devicesordered with custom part numbers are factory-programmed free of charge, making iteasy to get a custom clock uniquely tailored for each application. Si5332 can also beprogrammed via an I2C serial interface.

The Si5332 is a high-performance, low-jitter clock generator capable of synthesizing up to twelve user-programmable clock frequenciesup to 312.5 MHz. The device supports free run operation using an external or embedded crystal, or it can lock to an external clocksignal. The output drivers support up to twelve differential clocks or twenty four LVCMOS clocks, or a combination of both. The outputdrivers are configurable to support common signal formats, such as LVPECL, LVDS, HCSL, and LVCMOS. VDDO pins are provided forversatility, which can be set to 3.3 V, 2.5 V, 1.8 V or 1.5 V (CMOS only) to power the multi-format output drivers. The core voltagesupply (VDD) accepts 3.3 V, 2.5 V, or 1.8 V and is independent from the output supplies (VDDOxs). Using its two-stage synthesis architectureand patented high-resolution low-jitter MultiSynth technology, the Si5332 can generate an entire clock tree from a single device.

The Si5332 combines a wideband PLL with next generation MultiSynth technology to offer the industry’s highest output count high performanceprogrammable clock generator, while maintaining a jitter performance of 230 fs RMS. The PLL locks to either an external 16-50 MHz crystal or an embedded 50 MHz crystal for generating for generating free-running clocks or to an external clock (CLKIN_2/CLKIN_2# or CLKIN_3/CLKIN_3#) for generating synchronous clocks. In free-run mode, the oscillator frequency is multiplied by thePLL and then divided down either by an integer divider or MultiSynth for fractional synthesis.

The Si5332 features user-defined universal hardware input pins which can be configured in the ClockBuilder Pro software utility. Universalhardware pins can be used for OE, spread spectrum enable, input clock selection, output frequency selection, or I2C address select. If additional hardware input pins are needed, a user can define a different clock output as universal hardware input pins insteadusing ClockBuilder Pro.

The device provides the option of storing a user-defined clock configuration in its non-volatile memory (NVM), which becomes the defaultclock configuration at power-up. To enable in-system programming, a power up mode is available through OTP which powers upthe chip in an OTP defined default mode but with no outputs enabled. This allows a host processor to first write a user defined subset ofthe registers and then restart the power-up sequence to activate the newly programmed configuration without re-downloading the OTP.

Si5332主要特性:

? Any-Frequency 6/8/12-outputprogrammable clock generators
? Offered in three different package sizes,supporting different combinations of output
clocks and user configurable hardwareinput pins
? 32-pin QFN, up to 6 outputs
? 40-pin QFN, up to 8 outputs
? 48-pin QFN, up to 12 outputs
? MultiSynth technology enables anyfrequencysynthesis on any output up to250 MHz
? Highly configurable output path featuring across point mux
? Up to three independent fractionalsynthesis output paths
? Up to five independent integer dividers
? Embedded 50 MHz crystal option
? Input frequency range:
? External crystal: 16 to 50 MHz
? Differential clock: 10 to 250 MHz
? LVCMOS clock: 10 to 170 MHz
? Output frequency range:
? Differential: 5 to 312.5 MHz
? LVCMOS: 5 to 170 MHz
? User-configurable clock output signalformat per output: LVDS, LVPECL, HCSL,LVCMOS
? Temperature range: –40 to +85℃
? Down and center spread spectrum
? Pb-free, RoHS-6 compliant
? Si5332 Family Reference Manual
Si5332應用:
? Servers, Storage, Search Acceleration
? Ethernet Switches, Routers
? Small Cells, Mobile Backhaul/Fronthaul
? Print Imaging
? Communications
? Broadcast Video
? Test and Measurement
? Industrial, Embedded Computing

圖1.12輸出48-QFN封裝Si5332框圖

圖2.8輸出40-QFN封裝Si5332框圖

圖3.6輸出32-QFN封裝Si5332框圖

評估板Si5332-12EX-EVB

The Si5332-12EX-EVB is used for evaluating the Si5332 Low Jitter Any-Frequency Clock Generator. The Si5332 uses the patented Multisynth? technology to generate up to twelve independent clock frequencies each with 0 ppm synthesis error. TheSi5332-12EX-EVB has three independentinput clocks. The Si5332-12EX-EVB can be controlled and configured using the ClockBuilder Pro? (CB Pro?) software tool.

評估板Si5332-12EX-EVB主要特性:

? Powered from USB port or external powersupply.
? Onboard 25 MHz XTAL allows free-runmode of operation on the Si5332 or up to 2input clocks for synchronous clocking.
? CBPro? GUI programmable VDD supplyallows device to operate from 3.3, 2.5, or1.8 V.
? CBPro GUI programmable VDDO suppliesallow each of the 10 outputs to have itsown power supply voltage selectable from3.3, 2.5, or 1.8 V.
? CBPro GUI-controlled voltage, current, andpower measurements of VDD and allVDDO supplies.
? SMA connectors for input and outputclocks.

圖4.評估板Si5332-12EX-EVB外形圖

圖5.評估板Si5332-12EX-EVB功能框圖

圖6.評估板Si5332-12EX-EVB電路圖(1)

圖7.評估板Si5332-12EX-EVB電路圖(2)

圖8.評估板Si5332-12EX-EVB電路圖(3)

圖9.評估板Si5332-12EX-EVB電路圖(4)

圖10.評估板Si5332-12EX-EVB電路圖(5)

圖11.評估板Si5332-12EX-EVB電路圖(6)

圖12.評估板Si5332-12EX-EVB電路圖(7)

圖13.評估板Si5332-12EX-EVB電路圖(8)

圖14.評估板Si5332-12EX-EVB電路圖(9)

圖15.評估板Si5332-12EX-EVB電路圖(10)

圖16.評估板Si5332-12EX-EVB電路圖(11)

圖17.評估板Si5332-12EX-EVB電路圖(12)

圖18.評估板Si5332-12EX-EVB電路圖(13)
評估板Si5332-12EX-EVB材料清單:

圖19.評估板Si5332-12EX-EVB PCB設計圖(1)

圖20.評估板Si5332-12EX-EVB PCB設計圖(2)

圖21.評估板Si5332-12EX-EVB PCB設計圖(3)

圖22.評估板Si5332-12EX-EVB PCB設計圖(4)

圖23.評估板Si5332-12EX-EVB PCB設計圖(5)

圖24.評估板Si5332-12EX-EVB PCB設計圖(6)

圖25.評估板Si5332-12EX-EVB PCB設計圖(7)

圖26.評估板Si5332-12EX-EVB PCB設計圖(8)

圖27.評估板Si5332-12EX-EVB PCB設計圖(9)

圖28.評估板Si5332-12EX-EVB PCB設計圖(10)

圖29.評估板Si5332-12EX-EVB PCB設計圖(11)

圖30.評估板Si5332-12EX-EVB PCB設計圖(12)

圖31.評估板Si5332-12EX-EVB PCB設計圖(13)

圖32.評估板Si5332-12EX-EVB PCB設計圖(14)

圖33.評估板Si5332-12EX-EVB PCB設計圖(15)

圖34.評估板Si5332-12EX-EVB PCB設計圖(16)

圖35.評估板Si5332-12EX-EVB PCB設計圖(17)

圖36.評估板Si5332-12EX-EVB PCB設計圖(18)