1 Features

? Low IQ: 24μA

? Gain bandwidth product: 1MHz

? Low input bias current: 10fA

? Low offset voltage: ±45μV (maximum)

? Low drift: ±1.2μV/°C

? Low supply voltage operation: 1.7V to 5.5V

? Input common mode range ±100mV beyond rail

? Fast slew rate: 1V/μs

? High load capacitance drive

? High output current drive: 60mA

? Rail-to-rail output

? EMI and 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, OPA2391, and OPA4391 (OPAx391)

devices feature a unique combination of high

bandwidth (1MHz) along with very-low quiescent

current (24μA) in high-precision amplifiers. These

features combined with rail-to-rail input and output

make these devices an exceptional choice in highgain,

low-power applications. Ultra-low input bias

current of 10fA, only 45μV of offset (maximum), and

1.2μV/°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 Instruments' 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.