INA149 High Common Mode Voltage Difference Amplifier | TI.com

INA149
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High Common Mode Voltage Difference Amplifier

High Common Mode Voltage Difference Amplifier - INA149
Datasheet
 

Description

The INA149 is a precision unity-gain difference amplifier with a very 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.

The INA149 is pin-compatible with the INA117 and INA148 type high common-mode voltage amplifiers and offers improved performance over both devices. The INA149 is available in the SOIC-8 package with operation specified over the extended industrial temperature range of –40°C to +125°C.

Features

  • Common-Mode Voltage Range: ±275 V
  • Minimum CMRR: 90 dB from –40°C to +125°C
  • DC Specifications:
    • Maximum Offset Voltage: 1100 µV
    • Maximum Offset Voltage Drift: 15 µV/°C
    • Maximum Gain Error: 0.02%
    • Maximum Gain Error Drift: 10 ppm/°C
    • Maximum Gain Nonlinearity: 0.001% FSR
  • AC Performance:
    • Bandwidth: 500 kHz
    • Typical Slew Rate: 5 V/µs
  • Wide Supply Range: ±2.0 V to ±18 V
    • Maximum Quiescent Current: 900 µA
    • Output Swing on ±15-V Supplies: ±13.5 V
  • Input Protection:
    • Common-Mode: ±500 V
    • Differential: ±500 V

Parametrics

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Part number Order Number of channels (#) Vs (Min) (V) Vs (Max) (V) CMRR (Min) (dB) Common mode input low (Min) (V) Common mode input high (Max) (V) Input offset (+/-) (Max) (uV) Iq (Typ) (mA) Small signal bandwidth (Typ) (MHz) Slew rate (Typ) (V/us) Gain (Min) (V/V) Gain (Max) (V/V) Gain error (+/-) (Max) (%) Rating Operating temperature range (C) Input offset drift (+/-) (Max) (uV/C) Gain drift (Max) (ppm/C)
INA149 Order now 1     4     36     90     -275     275     1100     0.81     0.5     5     1     1     0.02     Catalog     -40 to 125     10     10    
INA117 Order now 1     10     36     86     -200     200     1000     2     0.2     2.6     1     1     0.05     Catalog     -40 to 85     20     10    
INA146 Order now 1     2.76     36     76     -100     100     5000     0.6     0.5     0.45     0.1     100     0.1     Catalog     -40 to 85     100     1    
INA148 Order now 1     2.7     36     70     -200     200     5000     0.6     0.1     1     1     1     0.075     Catalog     -55 to 125     100     3    
INA148-Q1 Samples not available 1     2.7     36     70     -200     200     5000     0.6     0.1     1     1     1     0.076     Automotive     -40 to 125     100     3