1FEATURES DESCRIPTION

2 The INA149 is a precision unity-gain difference • 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–

Maximum Offset Voltage: 1100 μV film resistor network. The INA149 can accurately

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

– Maximum Gain Error Drift: 10 ppm/°C or differential overloads of up to 500 V.

– 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

• Wide Supply Range: ±2.0 V to ±18 V and 500-kHz bandwidth of the INA149 are superior to

those of conventional isolation amplifiers.

– Maximum Quiescent Current: 900 μA

– Output Swing on ±15-V Supplies: ±13.5 V The INA149 is pin-compatible with the INA117 and

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

– Differential: ±500 V operation specified over the extended industrial

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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