1 Features

? Low IQ: 24 μA

? Gain bandwidth product: 1 MHz

? Low input bias current: 10 fA

? Low offset voltage: ±45 μV (maximum)

? Low drift: ±1.2 μV/°C

? Low supply voltage operation: 1.7 V to 5.5 V

? Input common mode range ±100 mV beyond rail

? Fast slew rate: 1 V/μs

? High load capacitance drive

? High output current drive: 60 mA

? Rail-to-rail output

? EMI/RFI filtered inputs

? Small package options: SC-70, DSBGA

2 Applications

? Portable electronics

? Flow transmitter

? Blood glucose monitor

? Process analytics (pH, gas, force, humidity)

? Temperature transmitter

? Pressure transmitter

? Medical sensor patches

? Building automation

? Wearable fitness and activity monitor

? Gas detector

? Analog security camera

3 Description

The OPA391 and OPA2391 (OPAx391) feature a

unique combination of high bandwidth (1 MHz)

along with very-low quiescent current (24 μA) in

high-precision amplifiers. These features combined

with rail-to-rail input and output make these devices

an exceptional choice in high-gain, low-power

applications. Ultra-low input bias current of 10 fA,

only 45 μV of offset (maximum), and 1.2 μV/°C of

drift over temperature help maintain high precision in

ratiometric and amperometric sensor front ends that

have demanding low-power requirements.

The OPAx391 use Texas Instrument's proprietary

e?trim? operational amplifier technology, enabling a

unique combination of ultra-low offset and low input

offset drift without the need for any input switching or

auto-zero techniques. The CMOS-based technology

platform also features a modern, robust output stage

design that is tolerant of high output capacitance,

alleviating stability problems that are common in

typical low-power amplifiers.