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OPA4322AIPWR

Quad 20MHz CMOS op-amp, 0.5pA Ibias, 7nV/√Hz, RRO, 1.8-5.5V, 14-TSSOP

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Manufacturer Part：

OPA4322AIPWR

Package：

14-TSSOP (5.0x4.4mm)

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Description

Product Overview

The OPA4322AIPWR from Texas Instruments is a quad-channel, low-noise, precision CMOS operational amplifier with 20MHz bandwidth and 0.5pA input bias current. Operating from a single 1.8V to 5.5V supply, it features 400μV offset voltage and 7nV/√Hz noise density. Housed in a 14-pin TSSOP package, it is ideal for low-power, high-impedance sensor applications.

Key Specifications

Category Quad Operational Amplifier
Number of Channels 4
Bandwidth (GBW) 20 MHz
Slew Rate 10 V/μs
Input Offset Voltage 400 μV (typical)
Input Bias Current 0.5 pA
Input Voltage Noise 7 nV/√Hz @ 1kHz
Supply Voltage 1.8V ~ 5.5V (single supply)
Quiescent Current per Channel 1.4 mA (typical)
Output Current ±50 mA (short circuit)
Rail-to-Rail Input and Output
Operating Temperature -40°C ~ 125°C
Package 14-TSSOP
Part Status Active

Features

  • Rail-to-rail input and output for maximum dynamic range
  • 20MHz GBW with only 1.4mA per channel
  • Ultra-low input bias current: 0.5pA
  • Low noise: 7nV/√Hz at 1kHz
  • Low offset voltage: 400μV typical
  • Single supply operation from 1.8V to 5.5V
  • Phase reversal protection
  • EMI filtered inputs
  • High capacitive load drive capability

Applications

  • High-impedance sensor interfaces
  • Photodiode and transimpedance amplifiers
  • Medical instrumentation
  • Battery-powered signal conditioning
  • Portable audio and data acquisition

The OPA4322AIPWR from Texas Instruments is a quad-channel, precision CMOS operational amplifier optimized for low-power, high-impedance sensor applications. The device combines 20MHz gain-bandwidth product and 10V/μs slew rate with an ultra-low input bias current of 0.5pA, making it ideal for interfacing with high-impedance sensors such as photodiodes, pH probes, and piezoelectric transducers. The rail-to-rail input and output stages maximize dynamic range in single-supply applications from 1.8V to 5.5V. With a low input offset voltage of 400μV and voltage noise density of 7nV/√Hz, the OPA4322 delivers precision performance for signal conditioning. Each channel consumes only 1.4mA, making the quad package efficient for multi-channel systems.

The OPA4322AIPWR uses a CMOS input stage that provides virtually zero input bias current (0.5pA), eliminating the offset errors caused by bias current flowing through high-impedance source resistors. The rail-to-rail input stage uses complementary PMOS/NMOS differential pairs that cover the entire supply range. The output stage uses a class-AB push-pull architecture for rail-to-rail output swing with low distortion. Internal EMI filtering on the inputs reduces susceptibility to RF interference. Phase reversal protection circuitry ensures the output does not invert when the input common-mode range is exceeded. The amplifier is internally compensated for unity-gain stability and can drive capacitive loads up to 1nF without oscillation.

Pin Name Type Description
1 OUT A O Channel A output
2 -IN A I Channel A inverting input
3 +IN A I Channel A non-inverting input
4 V+ PWR Positive supply (1.8V-5.5V)
5 +IN B I Channel B non-inverting input
6 -IN B I Channel B inverting input
7 OUT B O Channel B output
8 OUT C O Channel C output
9 -IN C I Channel C inverting input
10 +IN C I Channel C non-inverting input
11 GND GND Ground / Negative supply
12 +IN D I Channel D non-inverting input
13 -IN D I Channel D inverting input
14 OUT D O Channel D output
  • Photodiode TIA: Transimpedance amplifier for optical sensors with 0.5pA bias current
  • Medical Instrumentation: ECG/EEG front-end amplification with high input impedance
  • Multi-Channel DAQ: Quad op-amp for simultaneous 4-channel sensor signal conditioning
  • Portable Audio: Low-voltage audio preamplifier with low noise and RRO
  • Chemical Sensors: pH and gas sensor interface requiring ultra-low input current
Model Manufacturer Key Difference
OPA322AIPWR Texas Instruments Single channel, same specs, 8-SOIC
OPA2322AIPWR Texas Instruments Dual channel, same specs, 8-SOIC/MSOP
MCP6004-I/ST Microchip 1MHz GBW, lower cost, 14-TSSOP
TLV9004IPWR Texas Instruments 1MHz, 350μA/ch, ultra-low power alternative
ADA4522-4ARZ Analog Devices Zero-drift, 2.1μV offset, 14-SOIC
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Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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