Silabs公司的Si52258/54是用于PCIe Gen1/2/3/4/5公共時鐘和/或SRIS的業界最高性能和最低功耗汽車級的PCIe時鐘發生器,所有時鐘和PCIe Gen1/2/3/4/5公共時鐘與單獨基準架構指標兼容,硬件控制引腳可用來啟動和禁止輸出,以及啟動和禁止擴展頻譜用來降低EMI.Si52258/54具有內部終端的8/4輸出,和PCIe Gen 1/2/3/4/5兼容,汽車級2工作溫度–40 到 +105℃,內部100 Ω 或85 Ω電阻線路匹配,具有極好的抖動性能: Gen3/4為0.05 ps RMS, Gen5為0.025 ps RMS.三角擴展頻譜用來降低EMI,可低至0.25%或0.5%,單獨硬件控制引腳用來輸出使能,擴展頻譜使能,25MHz晶振輸入或時鐘輸入,工作電壓1.8V-3.3V,無鉛RoHS-6兼容.主要用在信息娛樂設備, ADAS ECU,雷達傳感器和激光雷達(LiDar)傳感器.本文介紹了Si52258主要特性和特性列表,框圖以及評估板Si52258-EVB主要特性,功能框圖和主要特性,電路圖,材料清單和PCB設計圖.

The Si52258/54 are the industry’s highest performance and lowest power automotive grade PCI Express clock generators for PCIe Gen1/2/3/4/5 common clock and/or SRIS applications. The Si52258 and Si52254 source eight and four 100 MHz PCIe differential clock outputs, respectively. All clock outputs are compliant to PCIe Gen1/2/3/4/5 common clock and separate reference clock architecture specifications.

Hardware control pins are available for enabling and disabling the outputs, as well as spread spectrum enable/disable for EMI reduction.

For more information about PCI Express, Silicon Labs’ complete PCIe portfolio, applicationnotes, and design tools, including the Silicon Labs PCIe Clock Jitter Tool for PCI Expresscompliance, please visit the Silicon Labs PCI Express Learning Center.

Si52258主要特性:

? 8/4-outputs with internal termination
? PCIe Gen 1/2/3/4/5 compliant
? Automotive grade 2: –40 to +105℃
? Internal 100 Ω or 85 Ω line matching
? Excellent jitter performance
? 0.05 ps RMS (Gen3/4)
? 0.025 ps RMS (Gen5)
? Triangular spread spectrum for EMIreduction, down spread 0.25% or 0.5%
? Individual hardware control pins for OutputEnable, Spread Spectrum Enable
? Enable and Frequency Select
? 25 MHz crystal input or clock input
? 1.8–3.3 V power supply
? Pb-free, RoHS-6 compliant

Si52258應用:

? Infotainment
? ADAS ECU
? Radar Sensors
? LiDar Sensors

Si52258特性列表:

? 8/4-outputs with internal termination
? PCIe Gen1/2/3/4/5 compliant
? Automotive grade 2: –40 to +105℃
? Internal 100 Ω or 85 Ω line matching
? Excellent jitter performance
? 0.05 ps RMS (Gen3/4)
? 0.025 ps RMS (Gen5)
? Triangular spread spectrum for EMI reduction, down spread 0.25% or 0.5%
? Individual hardware control pins for Output Enable, Spread Spectrum Enable
? Enable and Frequency Select
? 25 MHz crystal input or clock input
? 1.8–3.3 V power supply
? Pb-free, RoHS-6 compliant

圖1.Si5225x系列框圖

評估板Si52258-EVB

The Si52258-EVB is used for evaluating the eight output Si52258A-D01AM Automotive gradePCIe Reference Clock Generator. The Si52258A-D01AM device uses the on-board 25 MHz crystal as reference clock source and generates 8 copies of a 100 MHz HCSL format output clock compliant to PCIe Gen 1/2/3/4/5 common clock and separate reference clock specifications.

評估板Si52258-EVB主要特性:

? Powered from either USB port or external +5Vpower supply.
? On-board 25 MHz crystal reference.
? Programmable device core VDD supply foroperation at 3.3 V, 2.5 V, or 1.8 V.
? Programmable VDDO (output driver) suppliesallow each of the clock output banks to have itsown power supply voltage selectable from 3.3V, 2.5 V, or 1.8 V.
? SMA connectors for all output clocks.
? PCIe compliant spread spectrum enabled/disabled via on-board switch.
? Internal output termination switch selectable for100 Ω or 85 Ω operation.
? Output enable (OE) control switch per output.
? All output trace lengths matched to 10 inches.
? Loss of Signal (LOS) indication LED.

圖2.評估板Si52258-EVB外形圖

圖3.評估板Si52258-EVB功能框圖


圖4.評估板Si52258-EVB DIP開關位置圖

圖5.評估板Si52258-EVB電路圖(1)

圖6.評估板Si52258-EVB電路圖(2)

圖7.評估板Si52258-EVB電路圖(3)

圖8.評估板Si52258-EVB電路圖(4)

圖9.評估板Si52258-EVB電路圖(5)

圖10.評估板Si52258-EVB PCB設計圖(1)

圖11.評估板Si52258-EVB PCB設計圖(2)

圖12.評估板Si52258-EVB PCB設計圖(3)

圖13.評估板Si52258-EVB PCB設計圖(4)

圖14.評估板Si52258-EVB PCB設計圖(5)

圖15.評估板Si52258-EVB PCB設計圖(6)

圖16.評估板Si52258-EVB PCB設計圖(7)

圖17.評估板Si52258-EVB PCB設計圖(8)

圖18.評估板Si52258-EVB PCB設計圖(9)

圖19.評估板Si52258-EVB PCB設計圖(10)

圖20.評估板Si52258-EVB PCB設計圖(11)

圖21.評估板Si52258-EVB PCB設計圖(12)

圖22.評估板Si52258-EVB PCB設計圖(13)

圖23.評估板Si52258-EVB PCB設計圖(14)
評估板Si52258-EVB材料清單:



詳情請見:
https://www.silabs.com/documents/public/data-sheets/si5225x-datasheet.pdf
和https://www.silabs.com/documents/public/user-guides/ug399-si52258-evb.pdf
si5225x-datasheet.pdf
ug399-si52258-evb.pdf