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INA149

Competitor A

INA149-EP

www.ti.com

SBOS608A – MARCH 2012 – REVISED APRIL 2012

HIGH COMMON-MODE VOLTAGE DIFFERENCE AMPLIFIER

1

FEATURES

2

•

Common-Mode Voltage Range: ±275 V

SUPPORTS DEFENSE, AEROSPACE,

AND MEDICAL APPLICATIONS

•

Minimum CMRR: 84 dB from –55°C to +125°C

•

Controlled Baseline

•

DC Specifications:

•

One Assembly/Test Site

–

Maximum Offset Voltage: 3500

μV

•

One Fabrication Site

–

Maximum Gain Error: 0.047%

•

Available in Military (–55°C/125°C)

–

Maximum Gain Nonlinearity: 0.001% FSR at

25°C

•

Extended Product Life Cycle

•

AC Performance:

•

Extended Product-Change Notification

–

Bandwidth: 500 kHz

•

Product Traceability

–

Typical Slew Rate: 5 V/

μs

•

Wide Supply Range: ±2.0 V to ±18 V

–

Maximum Quiescent Current: 1100

μA

–

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

•

Input Protection:

–

Common-Mode: ±500 V

–

Differential: ±500 V

APPLICATIONS

•

High-Voltage Current Sensing

•

Battery Cell Voltage Monitoring

•

Power-Supply Current Monitoring

•

Motor Controls

•

Replacement for Isolation Circuits

(1)

Additional temperature ranges available - contact factory

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 military temperature range of –55°C to +125°C.

1

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 © 2012, 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.