新一代FemtoClock-2頻率合成器解決技術方案

1、AO-Electronics傲壹電子官網(wǎng)：中文網(wǎng)：Renesas RC32504A新一代FemtoClock 2頻率合成器解決方案Renesas公司的RC32504A是先進的高性能新一代FemtoClock 2頻率合成器,采用簡單的低成本基頻模式石英晶體作為低頻參考,用來合成相位噪聲低于 0.5 ps RMS,頻率高達 1.3 GHz 的高品質時鐘信號,還具有抖動衰減模式,在接收噪聲參考時,也能提供100fs 的輸出抖動性能.FemtoClock器件是能夠生成參考頻率的完全可定制獨立解決方案,可用于代替高性能應用中的晶體和SAW振蕩器.與固定頻率振蕩器不同,FemtoClocks采用頻率合成技

2、術(時鐘合成器),可提供多個時鐘頻率,而且在任何應用中都具有更高的靈活性.器件的抖動低至64fs(典型值)RMS,具有600mW低功耗.采用24和28引腳4mm x 4mm QFN封裝,具有四個差分輸出的單,雙輸入選項.電源噪聲抑制優(yōu)于-80dB,輸出到輸出隔離為-80dBc.符合ITU-T G.8262和G.8262.1標準.支持高達1MHz I2C或高達20MHzSPI串行處理器端口.主要用于增強型同步以太網(wǎng)/OTN以及可編FiberOptic模塊的基準時鐘.本文介紹了RC22504A主要特性,框圖和詳細框圖以及評估板RC32504A /RC22504A EVB主要特性,框圖,功能分布圖,

3、以及電路圖和材料清單.The RC22504A is a small, low-power timingcomponent designed to be placed immediatelyadjacent to a PHY, switch, ASIC or FPGA thatrequires several reference clocks with jitterperformance less than 100fs (max). The RC22504Acan act as a frequency synthesizer to locally generatethe reference c

4、lock or as a DCO for frequencymargining or OTN clock applications.The device is a member of Renesas highperformanceFemtoClock2 family.RC22504A主要特性: Jitter as low as 64 fs RMS maximum (10Hz to20MHz) PLL core consists of fractional-feedback AnalogPLL (APLL) Operates from a 25MHz to 80MHz crystal or XO

5、 APLL frequency independent of input / crystalfrequency Operates as a frequency synthesizer or DigitallyControlled Oscillator (DCO) DCO has tuning granularity of 1ppb Programmable status output 4 differential / 8 LVCMOS outputs Any frequency from 10MHz to 1GHz (180MHz forLVCMOS) Programmable output

6、buffer supports HCSL(DC-coupled), LVDS/LVPECL/CML (AC-coupled)or two LVCMOS Differential output swing is selectable: 400mV to800mV Output Enable input with programmable effect Supports up to 1MHz I2C or up to 20MHz SPI serialprocessor port Can configure itself automatically after reset viainternal c

7、ustomer-definable One-TimeProgrammable (OTP) memory with up to fourdifferent configurations 4 4 mm 24-QFN packageRC22504A應用: Reference clock generator for 100Gbps / 400GbpsPHYs or switches Adjustable OTN clock reference for OTU3 / OTU4mappers Reference clock for programmable FiberOpticModules圖1.RC22

8、504A框圖圖2.RC22504A詳細框圖評估板RC32504A /RC22504A EVBThe RC32504A / RC22504A evaluation board (EVB) is designed to help users evaluate the RC32504A and RC22504A Clock Generators, also known as FemtoClock 2. The RC32504A supports Jitter Attenuator and Synthesizer functionality, and the RC22504A supports onl

9、y Synthesizer functionality.When the evaluation board (EVB) is connected via USB to the users computer running the Renesas RICBox Software, FemtoClock 2 can be configured and programmed to generate frequencies with best-in-class performance. FemtoClock 2 has four output pairs that can be programmed

10、to CMOS style, LVDS style, or HCSL style outputs.評估板RC32504A /RC22504A EVB主要特性: Develop configurations with RenesasRICBox software and upload to the EVB through USB Can be powered from the USB connection EVB is a combination evaluation with Renesas Low Noise power supply regulators and Renesas Low N

11、oise fan-out buffer Clock output pairs are AC coupled and can be connected directly to test equipment through coax cables.評估板RC32504A /RC22504A EVB包括: Renesas RS32504A ultra-low noise synthesizer and jitter attenuator Renesas RAA214020 low-noise power supply regulators Renesas 8P34S1208I low-noise fan-out buffer FTDI FT232HQ USB-to-I2C bridge圖3.評估板RC32504A /RC22504A EVB外形圖圖4.RC22504A通信通路框圖圖5.評估板RC3