【应用】小封装双运放SGM8302应用于高速数据采集保持电路设计

时间： 2020-04-15 来源：世强

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随着雷达，通信，遥感遥测，医学成像，精确控制等技术应用领域的不断发展，电子系统需要处理的模拟信号带宽以及动态范围越来越大，对数据采集系统的采集精度，采集速率等提出了更高要求。本文推荐SGMICRO的SGM8302 高速运放作为高速数据采集保持电路，该运放实现100MHz-3dB带宽和12V的输入信号动态范围。

图1.数据采集保持电路

如图1所示，越来越多的设计应用领域要求具有高精度的A／D转换和实时处理功能。而A/D转换前端的采样保持电路直接关系到A/D芯片的转换速度和精度。为实现高速，高精度的A/D转换，也要求有高速的采样保持电路为A/D芯片做采样前的信号处理，做到尽可能快速地采样到信号，并尽可能长时间地保持住信号电平值。

采样保持电路能够跟踪或者保持输入模拟信号电平值，在理想状态下，当处于采样状态时，采样保持电路的输出信号跟随输入信号变化而变化；当处于保持状态时，采样保持电路的输出信号保持为接到保持命令的瞬间的输入信号电平值。

采样保持电路采用两级高精度运放组成，因运放的输入高阻抗特性，两级运放都起到信号隔离作用，他们就像两个电压跟随电路。前级隔离模拟输入信号，后级隔离A/D电路。两级运放中间采用小电容充放电电路实现实时数据保持。理想的高速A/D就需要高速高精度的采样保持电路，要求运放具有高速信号切换能力，并具有很低的输入零漂及温漂，以获得高精度。

图2.SGM8302架构

SGM8302是高速轨到轨输出的双运放，提供绿色环保的SOIC-8和MSOP-8封装。其主要特点如下：

1. 宽信号特性：4.5V-12V的单电源供电，及±2.25到±6V的双电源供电。电源范围也是输入/输出信号范围，所以SGM8302具有很宽的模拟输入信号范围。

2. 高速特性：100MHz的3dB带宽，并在56MHz带宽内增益平坦度达到0.1dB，信号摆率达到：155V/μs 。

3. 高精度：典型输入零漂为5 mv,输入温漂为12μV/°C。差分增益误差为0.02%,差分相位误差为0.02°。

4. 输出驱动电流达103mA，有利于A/D接入的信号稳定；

5. 工作温度范围为-40℃~+85℃，适合各种工业环境。

从上述特性可见，小封装双运放SGM8302的高速，高精度性能非常适合50MHz-100MHz的高速A/D的信号采样和保持电路设计。

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

2024/6/11 - SGMICRO - 选型指南代理服务技术支持批量订货

圣邦微电子（北京）股份有限公司专注于高性能、高品质模拟集成电路的研发和销售，为工业、汽车、通信、消费类和医疗市场的广泛应用提供创新解决方案，是A股上市首家专注于模拟芯片领域的半导体企业，也是2008年至今唯一连续获评“十大中国IC设计公司”的企业。

运算放大器比较器仪表放大器电流检测放大器音频功率放大器视频缓冲器线性驱动器温度传感器 ADC DAC 电平转换逻辑器件电压基准源模拟开关射频开关静电保护 LDO DC/DC升压 DC/DC降压 DC/DC升降压背光驱动监控芯片看门狗过压保护负载开关电池管理芯片电池保护马达驱动电机驱动 MOS驱动高边驱动低边驱动 MOSFET 氮化镓驱动车规基准源车规低噪声运算车规高速运算车规高精度运放车规电流检测放大器车规比较器车规电平转换车规监控电路车规看门狗车规逻辑器件车规ADC 车规DC/DC 车规LDO 车规门驱动车规高边驱动车规低边驱动 TEC控制器 APD偏置升压芯片 EML驱动负压电荷泵硅光控制器AFE 集成电感电源芯片

代理服务线上商城技术资料

SGMicro（圣邦微）-TI/ADI/ON产品对照表

型号- OPA335,OPA698,SGM8273-1AXN5,OPA2364,OPA330,SGM8955XN5G/TR,AD8605ARTZ,SGM724,LMV821M7 NOPB,SGM8199A3XC6G/TR,OPA2357,SGM80582XS8G,OPA2355,OPA2354,SN74LVC1G08DCKR,TPS61240,SGM8261-2,74LVC1G32GW,LMP2021MF/NOPB,AD8531ART,LM7301IM5 NOPB,OPA2350,SGM8094,MC33272ADR2G,SGM8091,SGM8092,SGM8093,SGM722,ADTL084,TLV3542,OPA376AIDCKR,TLV3541,LMC7660,SGM810-SXN3/TR,NCV33274ADR2G,OPA2170AIDGKR,AD8629ARMZ-REEL,SGM809-SXN3/TR,OPA364IDBVR,SN74LV4051,SGM8557-1XN5,TS321IDBVR,SGM8270-2XS8G/TR,TLV3544,SN74LVC1G00DCKR,IMP809T,IMP809S,IMP809M,SGM8770XS8G/TR,SGM8416-1,SGM8957-1XN5G/TR,SGM8416-2,TLV271IDBVR,ADM708SARZ,SGM8271BYN5G/TR,TPS73433DDCR,SGM809-RXN3L/TR,AF809N293MR-3,AD8091,SGM7SZ125YC5G/TR,SGM58031,AD8094,AD8093,AD8092,SGM8273-2,LT1797CS5#TRMPBF,SN74AHCT1G125D,SGM8273-4,OPA2365,SGM8273-1,SGM809-XXN3/TR,AME8500AEETAF31Z,74AVCH8T245PW,OPA376,SGM8557-3,LMV321IDBVR,SGM8557-1,SGM8557-2,LMH6611MKX/NOPB,SGM7SZ00YN5G/TR,SGM809-SXN3L/TR,AD8062,AD8061,SGM721XS/TR,OPA330AIDBVR,AD8063,SGM42609,AME8500AEETAF44Z,PT7M7810STEX,SGM7SZ08YN5G/TR,SGM8541XN5/TR,INA214B,SGM7SZ04YC5G/TR,LM358,SGM8957-2XMS8G/TR,TXB0104RUTR,NCS20074DTBR2G,SN74LVC1G3157DCKR,LMV324,TL343,OPA3355,SGM8270-2,SGM8270-4,OPA357,OPA2188,OPA354,OPA355,SGM61230,SGM8558-1,SGM8301YN5,NCS199A2SQT2G,OPA350,OPA4357,SGM8T245XTS24G/TR,OPA2171,OPA4354,SGM2205-3.3XKC3G/TR,SGM8210-1AXN5G/TR,OPA365,OPA4350,TSV321RILT,TLV4333,TL082IDR,AD8051,AD8055,AD8054,AD8053,LMV934MTX/NOPB,AD8052,LMV824DR2G,SGM721XN5/TR,SGM8255A-1XN5G/TR,SGM8274YTS14G/TR,SGM2040-3.3YUDH4G/TR,MC33202,UA78M33CKCS,LMV358,SN74LVC1G32DCKRE4,SGM2036-3.3YN5G/TR,OPA4170AIDR,SGM8557-1AXN5G,SGM8622XMS/TR,LP2980,MC33179DR2G,SGM809-1.63V,SGM8255A-2XS8G/TR,SGM8551XN5,TLV2171,SGM8740YN5,SGM8273-2XS,LM393,SGM8632C,SGM8273-1AXN5G/TR,ADM706SARZ,LMV822MMX/NOPB,ISL28290FBZ-T7,AD8615_6,TLV274IPWR,AD8666ARMZ-REEL,OPA172IDBVR,SGM8965,MC33178DR2G,SGM8604,MCP6004T-E/ST,TLC2272,LM258,SGM7SZ245XTS20G/TR,LMV393,TL082,SGM8965-2,SGM8965-1,INA199A1DCKR,MCP6561T-E/OT,SGM8957,SGM8959,SGM8955,OPA2320,TPS54218ARTE,LM2904,AD8614ARTZ-R2,SGM3749YTDI6G/TR,SGM811-SXKA4/TR,TPS61165,OPA2171AIDGKR,SGM4564YUQN12G/TR,LMC6482AIMX NOPB,TPS61160,SGMOP07EXS8G/TR,SGM8557-2XS8G/TR,MAX4239,SGM7SZ08YC5G/TR,SGM3157YC6/TR,TS321ILT,OPA2301,SGM8210-2XMS8G/TR,"SGM8255A-1XN5G/TR SGM8425AYN5G/TR",SN74LVC1G14DBVRG4,VIC5111-293BDI,TPS54202,SGM8552XMS8G/TR,TSZ122IST,ISL28177,STR8293-263BSI,OPA2335,TLV272IDGKR,MC74HC1G04DFT2G,OPA365AIDBVR,SGM8557-1AXN5G/TR,SGM8631,SGM8632,SGM8554XTS14G/TR,LSP2200CALS,AP7335-33WG-7,SGM7SZ14YC5G/TR,LM358AN NOPB,LSP2200CALR,SGM8634,NC7SZ08P5X,INA199B1DCKR,AD8538,TLV3201AIDBVR,SN74AVC2T244DQ,SGM8542,SGM8301,SGM8544,SGM8302,SGM8199A1XC6G/TR,INA199A3DCKR,SGM809-TXN3/TR,SGM8304,SGM8428,AD8668,NCS333SN2T1G,SGM8555-1XN5,SGM8631XN5/TR,SGM8959-1,SGM4556YXDO8G/TR,MC33272,SGM8652,SGM8199A2XC6G,SGM8653,TLV62565DBV,SGM8654,SGM8959-1XN5G/TR,SGM8655,125,SGM8770,NCS20072DR2G,SGM8651,AD8552,SGM8538,LMV824IPT,SN74AHCT245DWR,TLC272,TL064IDT,TLE2021,TLE2142,SGM8199A2,NCS2333DR2G,PT7M7809S,TP5552,SGM41298,SGM6011,LM7321MF/NOPB,SGM8210-2XS8G,SGM8556,SGM8957-2XS8G/TR,SGM2558BYS8G/TR,SGM8552,ISL28133FHZ-T7,OPA340UA,MAX9617AXT+T,SGM8557,SGM8558,IMP811SEUS-T,MCP664,MCP662,SGM6605-5.0YN6G/TR,ADN8834,INA199A2DCKR,NCV33274ADTBR2G,MCP661,SGM3209YS8G/TR,INA199B2DCKR,MC33074ADTBR2G,SGM8199A3XC6G,SN74LVC2244APWR,LM7322MME/NOPB,NL17SZ08DFT2G,MC33078,MCP651,MCP652,AD8628,OPA376AIDBVR,SGM8255-4XS14G/TR,SN74LVC1G125DC,ADA4891-1,LMV342MM NOPB,ADA4891-2,LMV710M5 NOPB,SN74AHC1G14DBVR,AD8510,NCS199A1SQT2G,SN74AVC8T245PWR,AD823,OPA4330AIPWR,74LVC1G08GW,TPH2502,TPH2501,TPH2504,ADA4891-4,LM2903MX,AD8605ARTZ-REEL7,AD8602,SGM8295-4XS14G/TR,AD8605,OPA4277UA,MC33172,SGM7SZ32YC5G/TR,LMC7101QM5/NOPB,SN74LVC1G14DCKR,SGM8210-1,SGM8210-2,TSZ121ILT,AIC809-29,TLV2333IDR,LMV611MF/NOPB,SGM8199A2XC6G/TR,SGM8740YN5G/TR,SGM8632CXMS8G/TR,NC7S04P5X,SGM8271AYN5G/TR,LM3526,OPA2197,SGM8958-1XC5G/TR,AD8665ARJZ-REEL,SGM7SZ244,SGM321,TLV2314IDGKR,SGM8251XS8G/TR,LM258DR2G,TPS61410,SGM8294YTS14G/TR,STR8210-293BSI,SGM80584,SGM8273-2XS8G/TR,AME8500AEETAF26Z,OPA177GS/2K5,LM4871,SGM8252A,SGM809-RXN3/TR,LMV824MX NOPB,SGM7SZ14YN5G/TR,TS507IYLT,SGM8270,LMH6643,SGM8271,LMH6644,SGM8273,LMH6642,MP2459,SGM3749YTN6G/TR,SGM80581,SGM80582,SGM8581XN5G/TR,TS321AILT,LMV822,SGM706B,TLV2372IDGKR,LMV722MMX-NOPB,NJM3403AV,ISL28130CHZ-T7,SN74LVC1G08DBVR,SGM8061,SGM8062,SGM8063,TP2412,SGM4871YS8/TR,OPA2171AIDR,LF353DR,LMV710,TLV333,SGM809-MXN3/TR,LM293ADR,PT7M7809STEX,SGM8965-1XN5G/TR,SGM8051,SGM8052,SGM8295,SGM8053,TPS72733,SGM8054,LMV842,AME8500AEETAF29Z,SGM8055,DRV8837DSGR,SGM708B,SGM8199A1XC6G,SN74AHC1G00DBVR,CY74FCT2245CTQ,SGM8965-1XN5,TS5A3157,MCP6004T-I/SL,SGM2300-ADJYN5G/TR,SGM48751YTS16G/TR,LMC7101AIM5 NOPB,ADA4807-1,LMP2022MAX/NOPB,TLV9062,CY74FCT2244ATQ,LMP7715MFX/NOPB,ADS1115,NCS20081SN2T1G

SGMICRO - 对照表代理服务技术支持批量订货

圣邦微电子荣膺2024年度“十大中国IC设计公司”奖项

在刚刚结束的 2024 年度中国 IC 设计成就奖颁奖典礼上，圣邦微电子获评“十大中国IC设计公司”。评选由全球电子技术领域领先媒体集团 AspenCore 举办，今年是圣邦微电子连续第十七年获此奖项。

2024-04-03 - 原厂动态代理服务技术支持批量订货

SGMICRO放大器选型表

专用运算放大器，高输出电流400mA，低功耗1.1μA；高速运算放大器，500MHz增益带宽，高压摆率265V/μs；高精度运算放大器，失调电压低至5μV，低温漂0.011μV/℃；电流检测放大器，高共模电压105V，高共模抑制比140dB；低噪声运算放大器，低噪音1.6nV/√Hz，低失调电压8.5mV；微功耗运算放大器，最低功耗低至350nA，1\2\4路，轨至轨输入输出；低功耗运算放大器，功耗低至2.5μA，最大工作电压36V

选型表 - SGMICRO 立即选型

SGM8051/2/3/4/5系列高速运算放大器应用指南与典型电路

本篇介绍了应用圣邦微电子高速运算放大器SGM805x系列的关键问题：（1）电压反馈型运放的闭环增益和闭环带宽的乘积为常数；（2）驱动容性负载时，在输出和负载间串联小电阻或减小反馈环路的带宽；（3）电源引脚应加去耦电容，版图布局走线应尽量减小寄生电容；（4）接地平面宽度足够，电流回路尽量短；（5）输入和输出信号线不应平行；（6）典型应用电路有差分放大器、有源滤波器和视频驱动器。

2019-08-09 - 设计经验代理服务技术支持批量订货

圣邦微电子获评“国产模拟IC行业产业引领卓越奖”

由世纪电源网主办的第二届电源行业配套品牌颁奖晚会于 12 月 23 日圆满落幕，圣邦微电子荣获“国产模拟IC行业产业引领卓越奖”。

2024-01-03 - 原厂动态代理服务技术支持批量订货

24bit ADC精密运放，电源基准，令信号链设计更简单

型号- SGM5860X,SGM4040B,SGM8255A-1,SGM8255A-2,SGM58200,SGM5351,SGM58031,SGM5200,SGM5353,SGM5352,SGM2045,SGM58602,SGM58603,SGM5202,SGM58600,SGM5209,SGM58601,SGM5208,SGM2049,SGM5349

SGMICRO - 商品及供应商介绍代理服务技术支持批量订货

SGM8301/SGM8302/SGM8304 100MHz, High Voltage,Rail-to-Rail Output Amplifiers

型号- SGM8301,SGM8302,SGM8301YN5G/TR,SGM8304YS14G/TR,SGM8302YS8G/TR,SGM8301YS8G/TR,SGM8302YMS8G/TR,SGM8304YTS14G/TR,SGM8304,SGM8301YMS8G/TR

JUNE 2017 - SGMICRO - 数据手册 - REV. A. 3 代理服务技术支持批量订货查看更多版本

【选型】适用于光模块项目的高速运算放大器SGM8061系列，G=+10时-3dB带宽可以做到20MHz

客户的光模块项目中需要用到两颗高带宽的运放，采集APD光信号，一颗用来去除干扰，一颗用来整形。信号频率10MHz，幅度几十mv，在此信号特性下，能够实现40db的增益。根据以上客户的需求，笔者给客户推荐了SGMICRO（圣邦微）的高速运算放大器SGM8061系列产品，芯片在增益为1时的带宽可以做到500MHz，配合频率响应图我们可以看到G=+10时-3dB带宽可以做到20MHz。

2023-06-30 - 器件选型代理服务技术支持批量订货