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INA149

Competitor A

INA149

www.ti.com

SBOS579A

– SEPTEMBER 2011 – REVISED NOVEMBER 2011

High Common-Mode Voltage Difference Amplifier

1

FEATURES

DESCRIPTION

The INA149 is a precision unity-gain difference

2

•

Common-Mode Voltage Range:

±275 V

amplifier with a very high input common-mode

•

Minimum CMRR: 90 dB from

–40°C to +125°C

voltage range. It is a single, monolithic device that

•

DC Specifications:

consists of a precision op amp and an integrated

thin-film resistor network. The INA149 can accurately

– Maximum Offset Voltage: 1100 μV

measure small differential voltages in the presence of

– Maximum Offset Voltage Drift: 15 μV/°C

common-mode signals up to

±275 V. The INA149

– Maximum Gain Error: 0.02%

inputs are protected from momentary common-mode

or differential overloads of up to 500 V.

– Maximum Gain Error Drift: 10 ppm/°C

– Maximum Gain Nonlinearity: 0.001% FSR

In many applications, where galvanic isolation in not

required, the INA149 can replace isolation amplifiers.

•

AC Performance:

This ability can eliminate costly isolated input side

– Bandwidth: 500 kHz

power supplies and the associated ripple, noise, and

– Typical Slew Rate: 5 V/μs

quiescent current. The excellent 0.0005% nonlinearity

and 500-kHz bandwidth of the INA149 are superior to

•

Wide Supply Range:

±2.0 V to ±18 V

those of conventional isolation amplifiers.

– Maximum Quiescent Current: 900 μA

The INA149 is pin-compatible with the INA117 and

– Output Swing on ±15-V Supplies: ±13.5 V

INA148 type high common-mode voltage amplifiers

•

Input Protection:

and offers improved performance over both devices.

– Common-Mode: ±500 V

The INA149 is available in the SOIC-8 package with

operation specified over the extended industrial

– Differential: ±500 V

temperature range of

–40°C to +125°C.

APPLICATIONS

•

High-Voltage Current Sensing

•

Battery Cell Voltage Monitoring

•

Power-Supply Current Monitoring

•

Motor Controls

•

Replacement for Isolation Circuits

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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright

© 2011, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.