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AD628:  High Common-Mode Voltage, Programmable Gain Difference Amplifier

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.

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AD628:  High Common-Mode Voltage, Programmable Gain Difference Amplifier

Product Description

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

    • Data Sheet, Rev. G, 4/07

    RESOURCES & TOOLS

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    • 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
    • Single/Dual Supply: Single/Dual
    • Voltage Supply (Vmax) : ±18V
    • Gain Setting Method: Pin,Resistor
    • Gain Range (min to max): 100
    • Bandwidth G=10 (kHz typ): 600kHz
    • CMRR (dB): 75dB
    • Vnoise RTI 1-10 Hz µVp-p : 15µV p-p
    • Temperature Range: -40 to +85
    • Gain Error (%) max: +0.1%
    • Supply Current : 1.6mA
    • Package: SOIC
    • Vosi (µV): 1500µV

    Functional Block Diagram for AD628

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    AD8211 High CMV Shunt Mon Single 4.5V to 5.5V fixed 500 20 20 100dB 100dB 7 $0.81
    AD8212 High CMV Shunt Mon Single 7V to 65V Resistor 1000 1 1,000 100dB 100dB 1.1 $0.93
    AD8213 Dual High CMV Shunt Mon Single 4.5V to 5.5V fixed 500 20 20 100dB 100dB 7 $2.01
    AD8214 High CMV Threshold Detec Single 5V to 65V Resistor - 1 100 80dB 80dB 2.2 $0.76
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    AD8221 High Performance IA Dual 4.6V to 36V Resistor 562 1 1,000 80dB 130dB 0.25 $2.01
    AD8222 Dual High Performance IA Dual - to - Resistor 750 1 1,000 80dB 130dB 0.25 $3.63
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    *The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
    **Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.