INA149 Difference Amplifier

Texas Instruments' high common mode voltage difference amplifier

INA149 Difference AmplifierTexas Instruments' INA149 is a precision unity-gain difference amplifier with a high input common-mode voltage range. It is a single, monolithic device that consists of a precision op amp and an integrated thin-film resistor network. The INA149 can accurately measure small differential voltages in the presence of common-mode signals up to ±275 V. The INA149 inputs are protected from momentary common-mode or differential overloads of up to 500 V. 

In many applications, where galvanic isolation in not required, the INA149 can replace isolation amplifiers. This ability can eliminate costly isolated input-side power supplies and the associated ripple, noise, and quiescent current. The excellent 0.0005% nonlinearity and 500-kHz bandwidth of the INA149 are superior to those of conventional isolation amplifiers.

Features Applications
  • Common-mode voltage range: ±275 V
  • Minimum CMRR: 90 dB from –40°C to +125°C
  • Wide supply range: ±2.0 V to ±18 V
  • AC performance:
  • Bandwidth: 500 kHz
  • Typical slew rate: 5 V/µs
  • High-voltage current sensing
  • Battery cell voltage monitoring
  • Power-supply current monitoring
  • Motor controls
  • Replacement for isolation circuits

Difference Amplifier

ImageManufacturer Part NumberDescriptionAvailable Quantity
INA149AIDR datasheet linkIC OPAMP DIFF 500KHZ 8SOICINA149AIDRIC OPAMP DIFF 500KHZ 8SOIC2631 - Immediate
10000 - Factory Stock
INA149AIDR product page link

Evaluation Module

ImageManufacturer Part NumberDescriptionAvailable Quantity
INA149EVM datasheet linkEVAL MODULE FOR INA149INA149EVMEVAL MODULE FOR INA1496 - Immediate
10 - Factory Stock
INA149EVM product page link
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Published: 2013-07-02