AD628 High Common-Mode Voltage, Programmable Gain Difference Amplifier

A reference pin (VREF) provides a dc offset for converting bipolar to single-sided signals. The AD628 converts +5 V, +10 V, ±5 V, ±10 V, and 4 to 20 mA input signals to a single-ended output within the input range of single-supply ADCs. The AD628 has an input common mode and differential mode operating range of ±120 V. The high common mode, input impedance makes the device well suited for high voltage measurements across a shunt resistor. The inverting input of the buffer amplifier is available for making a remote Kelvin connection. A precision 10 kΩ resistor connected to an external pin is provided for either a low-pass filter or to attenuate large differential input signals. A single capacitor implements a low-pass filter. The AD628 operates from single and dual supplies and is available in an 8-lead SOIC_N or an 8-lead MSOP. It operates over the standard industrial temperature range of −40°C to +85°C. Applications High voltage current shunt sensing Programmable logic controllers Analog input front end signal conditioning +5 V, +10 V, ±5 V, ±10 V, and 4 to 20 mA Isolation Sensor signal conditioning Power supply monitoring Electrohydraulic controls Motor controls

The AD628 is a precision difference amplifier that combines excellent dc performance with high common-mode rejection over a wide range of frequencies. When used to scale high voltages, it allows simple conversion of standard control voltages or currents for use with single-supply ADCs. A wideband feedback loop minimizes distortion effects due to capacitor charging of Σ-Δ ADCs.

A reference pin (VREF) provides a dc offset for converting bipolar to single-sided signals. The AD628 converts +5 V, +10 V, ±5 V, ±10 V, and 4 to 20 mA input signals to a single-ended output within the input range of single-supply ADCs.

The AD628 has an input common mode and differential mode operating range of ±120 V. The high common mode, input impedance makes the device well suited for high voltage measurements across a shunt resistor. The inverting input of the buffer amplifier is available for making a remote Kelvin connection.

A precision 10 kΩ resistor connected to an external pin is provided for either a low-pass filter or to attenuate large differential input signals. A single capacitor implements a low-pass filter. The AD628 operates from single and dual supplies and is available in an 8-lead SOIC_N or an 8-lead MSOP. It operates over the standard industrial temperature range of −40°C to +85°C.

Applications
  • High voltage current shunt sensing
  • Programmable logic controllers
  • Analog input front end signal conditioning +5 V, +10 V, ±5 V, ±10 V, and 4 to 20 mA
  • Isolation Sensor signal conditioning
  • Power supply monitoring
  • Electrohydraulic controls
  • Motor controls
Features and Benefits
  • High common-mode input voltage range
    ±120 V at VS = ±15 V
  • Gain range 0.1 to 100
  • Operating temperature range:
    −40°C to +85°C
  • Supply voltage range
    Dual supply: ±2.25 V to ±18 V
    Single supply: 4.5 V to 36 V
  • Excellent ac and dc performance
  • Offset temperature stability RTI: 10 μV/°C maximum
  • Offset: ±1.5 V mV maximum
  • CMRR RTI: 75 dB minimum, dc to 500 Hz,
    G = +1
    • Amplifiers
    Linear Products
    Building Technology
    • White Goods and Vending
    Aerospace and Defense
    • Solutions
    SPICE Models
    Reference Designs
    Data Sheets
    Documentnote
    AD628: High Common-Mode Voltage, Programmable Gain Difference Amplifier Data Sheet (Rev. G)PDF 480 kB
    Application Notes
    Documentnote
    AN-282: Fundamentals of Sampled Data SystemsPDF 2131 kB
    AN-669: Effectively Applying the AD628 Precision Gain Block (Rev. 0)PDF 193 kB
    AN-244: A User's Guide to I.C. Instrumentation AmplifiersPDF 522 kB
    AN-245: Instrumentation Amplifiers Solve Unusual Design ProblemsPDF 543 kB
    AN-671: Reducing RFI Rectification Errors in In-Amp CircuitsPDF 208 kB
    AN-589: Ways to Optimize the Performance of a Difference Amplifier (Rev. B)PDF 115 kB
    Technical Books
    Documentnote
    Frequently Asked Questions
    Documentnote
    Order Information
    Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
    AD628ARMZ Production8 ld MSOPOTH 50-40 to 85C2.191.82Y
    AD628ARMZ-R7 Production8 ld MSOPREEL 1000-40 to 85C2.191.82Y
    AD628ARMZ-RL Production8 ld MSOPREEL 3000-40 to 85C2.191.82Y
    AD628ARZ Production8 ld SOICOTH 98-40 to 85C2.191.82Y
    AD628ARZ-R7 Production8 ld SOICREEL 1000-40 to 85C2.191.82Y
    AD628ARZ-RL Production8 ld SOICREEL 2500-40 to 85C2.191.82Y
    Reference Materials
    AD628: High Common-Mode Voltage, Programmable Gain Difference Amplifier Data Sheet (Rev. G) ad628
    AD628 SPICE Macro Model ad628
    CN0190 设计和集成文件 adp2108
    AN-282: Fundamentals of Sampled Data Systems ad1674
    AN-669: Effectively Applying the AD628 Precision Gain Block (Rev. 0) ad8350
    AN-671: 降低仪表放大器电路中的射频干扰整流误差 (Rev. 0) amp03
    AN-244: IC 仪表放大器用户指南 amp03
    AN-589: 差动放大器性能优化方法 (Rev. 0) ad8350
    AN-282: 采样数据系统基本原理[中文版] (Rev. A) ad75019
    AN-669: 有效地使用AD628精密增益模块 (Rev. 0) ad8350
    AN-244: A User's Guide to I.C. Instrumentation Amplifiers amp03
    AN-245: Instrumentation Amplifiers Solve Unusual Design Problems amp03
    AN-671: Reducing RFI Rectification Errors in In-Amp Circuits amp03
    AN-589: Ways to Optimize the Performance of a Difference Amplifier (Rev. B) ad8350
    CN-0190：具有6 V至14 V输入且性能鲁棒的多电压、高效率、25 W通用电源模块 adp2108
    MS-2405: Simple Circuit Measures the RMS Value of an AC Power Line ad8436
    Auto-Zero Amplifiers ad693
    Single IC provides gains of 10 and –10 ad628
    The AD8221 - Setting a New Industry Standard for Instrumentation Amplifiers amp03
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