AD9268-cn

AD9268Rev.AInformationfurnishedbyAnalogDevicesisbelievedtobeaccurateandreliable.However,noresponsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorotherrightsofthirdpartiesthatmayresultfromitsuse.Specicationssubjecttochangewithoutnotice.NolicenseisgrantedbyimplicationorotherwiseunderanypatentorpatentrightsofAnalogDevices.Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.OneTechnologyWay,P.O.Box9106,Norwood,MA02062-9106,U.S.A.Tel:[phone]©2009AnalogDevices,Inc.Allrightsreserved.功能框图CMOS/LVDSOUTPUTBUFFERCMOS/LVDSOUTPUTBUFFERADCDRVDDCSBAVDDSPISDIO/DCSSCLK/DFSPROGRAMMINGDATADUTYCYCLESTABILIZERDIVIDE1TO8DCOGENERATIONREFSELECTMULTICHIPSYNCSYNCAGNDNOTES1.PINNAMESAREFORTHECMOSPINCONFIGURATIONONLY;SEEFIGURE7FORLVDSPINNAMES.PDWNOEBDCOBDCOAD15A(MSB)TOD0A(LSB)D15B(MSB)TOD0B(LSB)ORACLK–CLK+ORBVIN+AVCMRBIASVIN–BVIN+BVIN–AVREFSENSEAD926808123-001ADC1616特性信噪比(SNR)：78.2dBFS(70MHz、125MSPS)无杂散动态范围(SFDR)：88dBc(70MHz、125MSPS)低功耗：750mW(125MSPS)1.8V模拟电源供电1.8VCMOS或LVDS输出供电1至8整数输入时钟分频器中频采样频率达300MHz小信号输入噪声：−153.6dBm/Hz(200Ω输入阻抗、70MHz、125MSPS)可选片内扰动可编程ADC内部基准电压源集成ADC采样保持输入灵活的模拟输入范围：1V峰峰值至2V峰峰值差分模拟输入、650MHz带宽ADC时钟占空比稳定器95dB通道隔离/串扰串行端口控制用户可配置的内置自测(BIST)功能节能的掉电模式应用通信分集无线电系统多模式数字接收器(3G)GSM、EDGE、W-CDMA、LTE、CDMA2000、WiMAX、TD-SCDMAI/Q解调系统智能天线系统通用软件无线电宽带数据应用超声设备产品聚焦1.片内扰动选项可改善低功耗模拟输入信号的无杂散动态范围(SFDR)性能。2.专有差分输入在最高300MHz的输入频率下仍保持出色的信噪比(SNR)性能。3.采用1.8V单电源供电，数字输出驱动器则采用独立电源供电，以支持1.8VCMOS或LVDS输出。4.标准串行端口接口(SPI)支持各种产品特性和功能，例如：数据格式化(偏移二进制、二进制补码或格雷码)、时钟DCS使能、节电模式、测试模式以及基准电压模式等。5.与AD9258引脚兼容，16位产品可轻松转换至14位产品。AD9268还与面向较低采样速率、低功耗应用的AD9251、AD9231和AD9204系列产品引脚兼容。16位、80MSPS/105MSPS/125MSPS、1.8V双通道模数转换器(ADC)图1.ADI中文版数据手册是英文版数据手册的译文，敬请谅解翻译中可能存在的语言组织或翻译错误，ADI不对翻译中存在的差异或由此产生的错误负责。如需确认任何词语的准确性，请参考ADI提供的最新英文版数据手册。AD9268Rev.A|Page2of44特性.....................................................................................................1应用.....................................................................................................1功能框图............................................................................................1产品聚焦............................................................................................1修订历史............................................................................................2概述.....................................................................................................3技术规格............................................................................................4ADC直流规格...............................................................................4ADC交流规格...............................................................................6数字规格........................................................................................7开关规格........................................................................................9时序规格......................................................................................10绝对最大额定值.............................................................................12热特性..........................................................................................12ESD警告.......................................................................................12引脚配置和功能描述....................................................................13典型工作特性.................................................................................17等效电路..........................................................................................25工作原理..........................................................................................26ADC架构......................................................................................26模拟输入考虑.............................................................................26基准电压源..................................................................................29目录时钟输入考虑.............................................................................30通道/芯片同步............................................................................31功耗和待机模式.........................................................................32数字输出......................................................................................32时序...............................................................................................33内置自测(BIST)和输出测试........................................................34内置自测(BIST).........................................................................34输出测试模式.............................................................................34串行端口接口(SPI).......................................................................35使用SPI的配置............................................................................35硬件接口......................................................................................36不使用SPI的配置.......................................................................36SPI访问特性................................................................................36存储器映射...............................