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AD8212:  HIGH VOLTAGE CURRENT SHUNT MONITOR

The AD8212 is a high common-mode voltage, current shunt monitor. It accurately amplifies a small differential input voltage in the presence of large common-mode voltages up to 65 V (>500 V with an external PNP transistor).

The AD8212 is ideal for current monitoring across a shunt resistor in applications controlling loads, such as motors and solenoids. The current output of the device is ...More

AD8212:  HIGH VOLTAGE CURRENT SHUNT MONITOR

Product Description

The AD8212 is a high common-mode voltage, current shunt monitor. It accurately amplifies a small differential input voltage in the presence of large common-mode voltages up to 65 V (>500 V with an external PNP transistor).

The AD8212 is ideal for current monitoring across a shunt resistor in applications controlling loads, such as motors and solenoids. The current output of the device is proportional to the input differential voltage. The user can select an external resistor to set the desired gain. The typical common-mode voltage range of the AD8212 is 7 V to 65 V.

Another feature of the AD8212 is high voltage operation, which is achieved by using an external high voltage breakdown PNP transistor. In this configuration, the common-mode range of the AD8212 is equal to the breakdown of the external PNP transistor. Therefore, operation at several hundred volts is easily achieved (see Figure 23 in the data sheet).

The AD8212 features a patented output base current compensation circuit for high voltage operation mode. This ensures that no base current is lost through the external transistor and excellent output accuracy is maintained regardless of common-mode voltage or temperature.

Applications

  • Current shunt measurement
  • Motor controls
  • DC-to-DC converters
  • Power supplies
  • Battery monitoring
  • Remote sensing

    • Data Sheet, Rev. A, 11/07

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    • Adjustable gain
    • High common-mode voltage range
      7 V to 65 V typical
      7 V to >500 V with external pass transistor
    • Current output
    • Integrated 5 V series regulator
    • 8-lead MSOP package
    • Operating temperature range of −40°C to +125°C
    • Single/Dual Supply: Single
    • Voltage Supply (Vmax) : +65V
    • Gain Setting Method: Resistor
    • Gain Range (min to max): 1000
    • Bandwidth G=10 (kHz typ): 1000kHz
    • CMRR (dB): 100dB
    • Vnoise RTI 1-10 Hz µVp-p : 1.1µV p-p
    • Temperature Range: -40 to +125
    • Supply Current : 720µA
    • Package: MSOP

    Functional Block Diagram for AD8212

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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.