1 Features

1• Precision with Zero-Crossover Distortion:

– Low Offset Voltage: 150 μV (Maximum)

– High CMRR: 114 dB

– Rail-to-Rail I/O

• Low Input Bias Current: 0.9 pA (Maximum)

• Low Noise: 7 nV/√Hz at 10 kHz

• Wide Bandwidth: 20 MHz

• Slew Rate: 10 V/μs

• Quiescent Current: 1.45 mA/Ch

• Single-Supply Voltage Range: 1.8 V to 5.5 V

• OPA320S and OPA2320S:

– IQ in Shutdown Mode: 0.1 μA

• Unity-Gain Stable

• Small Packages:

– SOT-23, VSSOP, SON, and SOIC

2 Applications

• High-Z Sensor Signal Conditioning

• Transimpedance Amplifiers

• Test and Measurement Equipment

• Programmable Logic Controllers (PLCs)

• Motor Control Loops

• Communications

• Input/Output ADC/DAC Buffers

• Active Filters

3 Description

The OPA320 (single) and OPA2320 (dual) are a new

generation of precision, low-voltage CMOS

operational amplifiers optimized for very low noise

and wide bandwidth while operating on a low

quiescent current of only 1.45 mA.

The OPA320 series is ideal for low-power, singlesupply

applications. Low-noise (7 nV/√Hz) and highspeed

operation also make them well-suited for

driving sampling analog-to-digital converters (ADCs).

Other applications include signal conditioning and

sensor amplification.

The OPA320 features a linear input stage with zerocrossover

distortion that delivers excellent commonmode

rejection ratio (CMRR) of typically 114 dB over

the full input range. The input common mode range

extends 100 mV beyond the negative and positive

supply rails. The output voltage typically swings within

10 mV of the rails.

In addition, the OPAx320 has a wide supply voltage

range from 1.8 V to 5.5 V with excellent PSRR

(106 dB) over the entire supply range, making them

suitable for precision, low-power applications that run

directly from batteries without regulation.

The OPA320 (single version) is available in a 5-pin

SOT23 package; the OPA320S shutdown single

version is available in an 6-pin SOT23 package. The

dual OPA2320 is offered in 8-pin SOIC, VSSOP, and

SON packages, and the OPA2320S (dual with

shutdown) in a 10-pin VSSOP package.