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.