1 Features

1• Gain Bandwidth: 20 MHz

• Low Noise: 8.5 nV√Hz at 1 kHz

• Slew Rate: 10 V/μs

• Low THD+N: 0.0005%

• Rail-to-Rail I/O

• Offset Voltage: 2 mV (maximum)

• Supply Voltage: 1.8 V to 5.5 V

• Supply Current: 1.5 mA/ch

– Shutdown: 0.1 μA/ch

• Unity-Gain Stable

• Small Packages:

– SOT-23, SON, VSSOP, TSSOP

2 Applications

• Sensor Signal Conditioning

• Consumer Audio

• Multi-Pole Active Filters

• Control-Loop Amplifiers

• Communications

• Security

• Scanners

3 Description

The OPAx322x series consists of single, dual, and

quad-channel CMOS operational amplifiers featuring

low noise and rail-to-rail inputs and outputs optimized

for low-power, single-supply applications. Specified

over a wide supply range of 1.8 V to 5.5 V, the low

quiescent current of only 1.5 mA per channel makes

these devices well-suited for power-sensitive

applications.

The combination of very low noise (8.5 nV√Hz at

1 kHz), high-gain bandwidth (20 MHz), and fast slew

rate (10 V/μs) make the OPAx322x family ideal for a

wide range of applications, including signal

conditioning and sensor amplification requiring high

gains. Featuring low THD+N, the OPAx322x series is

also excellent for consumer audio applications,

particularly for single-supply systems.

The OPAx322S models include a shutdown mode

that allow the amplifiers to be switched from normal

operation to a standby current that is typically less

than 0.1 μA.

The OPA322 (single version) is available in 5-pin

SOT-23 and 6-pin SOT-23, while the OPA2322 (dual

version) is offered in 8-pin VSSOP, 10-pin VSSOP, 8-

pin SOIC, and 8-pin SON packages. The quad

version OPA4322 comes in 14-pin TSSOP and 16-pin

TSSOP packages. All versions are specified for

operation from –40°C to +125°C.