Texas Instruments OPA2322AID

Overview

OPA2322AID from Texas Instruments is a dual-channel, rail-to-rail input/output CMOS operational amplifier optimized for low-power, single-supply signal conditioning. It delivers 20 MHz gain bandwidth, 10 V/μs slew rate, and 8.5 nV/√Hz input voltage noise at 1 kHz - enabling high-fidelity sensor amplification and audio front-end design in 1.8–5.5 V systems.

For engineers reviewing the OPA2322AID datasheet, OPA2322AID pinout, OPA2322AID application, or OPA2322AID equivalent, key selection criteria include its 2 mV max offset voltage, 1.5 mA/ch quiescent current, shutdown capability (0.1 μA/ch), unity-gain stability, and SOIC-8 package compatibility with industrial temperature range (–40°C to +125°C).

Technical Context

The OPA2322AID implements a zero-crossover rail-to-rail input stage that eliminates distortion near supply rails, critical for accurate multi-pole active filter implementation and control-loop feedback. Its CMOS input architecture achieves ±0.2 pA typical input bias current and 90–100 dB common-mode rejection over temperature.

Internally compensated for unity-gain stability, it drives capacitive loads up to 50 pF while maintaining 47° phase margin. The dual-channel architecture supports independent signal paths with matched AC performance - essential for stereo audio or differential sensor interfaces requiring channel-to-channel consistency.

Key Specifications

Pinout & Package

OPA2322AID is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, with exposed thermal pad on underside connected to V– for improved thermal dissipation. Pinout follows standard dual-opamp configuration with independent inputs/outputs per channel and shared power rails.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel, rail-to-rail op-amp applications.

Compared with OPA2322AID, OPA2322AIDR offers identical electrical behavior with optimized logistics for volume manufacturing, while MCP6022-I/SN trades bandwidth, noise, and power control for lower unit cost in non-critical applications.

Availability

OPA2322AID is available at Aetrix Electronics and suitable for medical sensor interface, portable audio line driver, industrial multi-pole active filter, and motor control feedback amplifier applications requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for OPA2322AID includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision amplifiers and signal-chain solutions.

The OPA2322AID belongs to TI's OPAx322x family of low-noise, rail-to-rail CMOS op-amps designed specifically for high-fidelity, low-power signal conditioning in battery-operated and space-constrained industrial and consumer systems.

FAQ

What is the maximum capacitive load the OPA2322AID can drive while remaining stable?

The OPA2322AID is specified to drive up to 50 pF capacitive loads with 47° phase margin under unity-gain conditions (VS = 5 V). For loads exceeding 50 pF, external isolation resistance (e.g., 10–50 Ω in series with the output) is recommended to maintain stability. This capability supports direct connection to ADC input capacitors and short PCB traces without added compensation networks - a key advantage in compact sensor node layouts where OPA2322AID serves as the final analog buffer.

Does the OPA2322AID support true rail-to-rail input operation across its full common-mode range?

Yes, the OPA2322AID features a zero-crossover rail-to-rail input stage that operates linearly from (V–) – 0.1 V to (V+) + 0.1 V, verified across –40°C to +125°C. Unlike conventional RRI op-amps that exhibit increased distortion near supply rails, this architecture eliminates crossover distortion - making OPA2322AID especially valuable in applications like ECG front-ends where input signals cross ground in single-supply configurations.

How does the shutdown feature of the OPA2322AID function, and what is its impact on system power?

The OPA2322AID does not include channel-specific shutdown pins; the standard OPA2322AID variant lacks shutdown functionality entirely. Shutdown is only available in the OPA2322S variants (e.g., OPA2322SIDR). Therefore, OPA2322AID operates continuously at 1.5 mA per channel and cannot be placed into low-current standby mode - users requiring dynamic power control must select the S-suffix version instead of OPA2322AID.

What is the typical input bias current of the OPA2322AID, and how does it affect high-impedance sensor interfaces?

The OPA2322AID exhibits ±0.2 pA typical input bias current at 25°C, rising to ±400 pA over –40°C to +125°C. This ultra-low value minimizes voltage error across high-value feedback or source impedances - for example, a 10 MΩ source contributes only 4 μV offset at worst-case temperature, preserving accuracy in piezoresistive bridge or photodiode transimpedance applications where OPA2322AID is commonly deployed.

Can the OPA2322AID be used with a single 1.8 V supply, and what performance trade-offs occur at minimum voltage?

Yes, the OPA2322AID is fully specified from 1.8 V to 5.5 V. At 1.8 V, gain bandwidth reduces to ~15 MHz and slew rate drops to ~7 V/μs, while input voltage noise increases slightly to ~9.5 nV/√Hz. However, all core functions - including rail-to-rail I/O, 2 mV max offset, and 0.0005% THD+N - remain guaranteed. This makes OPA2322AID viable for ultra-low-power IoT endpoints where OPA2322AID operates from harvested energy or coin cells without sacrificing signal fidelity.