Texas Instruments OPA2322AIDGKT

Overview

OPA2322AIDGKT from Texas Instruments is a dual-channel, rail-to-rail input/output CMOS operational amplifier optimized for low-noise, low-power, single-supply signal conditioning. It delivers 20 MHz gain bandwidth, 8.5 nV/√Hz input voltage noise at 1 kHz, and 10 V/μs slew rate, with 1.5 mA per channel quiescent current and 1.8 V to 5.5 V supply range - enabling high-fidelity sensor amplification in battery-powered audio and industrial monitoring systems.

For engineers reviewing the OPA2322AIDGKT datasheet, OPA2322AIDGKT pinout, OPA2322AIDGKT application, or OPA2322AIDGKT equivalent, key selection considerations include its dual-channel VSSOP-8 package, shutdown capability (0.1 μA/ch), rail-to-rail I/O swing within 20 mV of rails, and guaranteed 2 mV max offset voltage across –40°C to +125°C.

Technical Context

The OPA2322AIDGKT implements a zero-crossover rail-to-rail input stage that eliminates distortion during common-mode transitions near supply rails. Its CMOS input architecture achieves ultra-low input bias current (±0.2 pA typ at 25°C) and high open-loop gain (100–130 dB), supporting precision DC-coupled gain stages without significant error accumulation.

Internally compensated for unity-gain stability, it drives capacitive loads up to 50 pF while maintaining ≥47° phase margin. The dual-channel layout supports independent signal paths with 130 dB channel separation at 1 kHz, making it suitable for differential sensing and multi-pole active filter topologies requiring matched AC response.

Key Specifications

Pinout & Package

OPA2322AIDGKT is housed in an 8-pin VSSOP (DGK) package measuring 3.00 mm × 3.00 mm with exposed thermal pad (connected to V−). This thermally enhanced, surface-mount package supports high-density PCB layouts and improved power dissipation in compact industrial modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2322AIDGKT, OPA2333AIDR trades 20-MHz bandwidth for nanovolt-level drift stability, while MCP6V82-E/SN offers lower cost and chopper benefits but sacrifices output swing and noise performance - making OPA2322AIDGKT optimal for wideband, low-noise, rail-to-rail dual-channel signal conditioning.

Availability

OPA2322AIDGKT is available at Aetrix Electronics and suitable for medical pulse oximetry, industrial temperature sensing, and consumer audio line drivers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for OPA2322AIDGKT 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 OPAx322x family was designed specifically for low-noise, low-power, rail-to-rail signal conditioning in battery-operated and single-supply systems - targeting sensor interfaces, portable audio, and industrial process control.

FAQ

What is the maximum capacitive load the OPA2322AIDGKT can drive while remaining stable?

The OPA2322AIDGKT is unity-gain stable and characterized to drive up to 50 pF with ≥47° phase margin at 5 V supply. For loads exceeding 50 pF, external isolation resistance (e.g., 10–50 Ω in series with the output) is required to maintain stability - verified in Figure 16 of the SBOS538F datasheet. This capability supports direct connection to ADC input capacitors and long PCB traces without oscillation.

Does the OPA2322AIDGKT support true rail-to-rail input when powered from a 1.8-V supply?

Yes, the OPA2322AIDGKT supports common-mode input voltage from (V−) − 0.1 V to (V+) + 0.1 V across its full 1.8–5.5 V supply range. At 1.8 V, this means inputs can swing from –0.1 V to +1.9 V - enabling direct interfacing with 0–1.8 V digital logic or resistive sensor bridges without external level shifting, as confirmed in Section 6.7 of the datasheet.

How does the shutdown function operate on the OPA2322AIDGKT?

The OPA2322AIDGKT has no dedicated shutdown pin; it is the non-shutdown variant of the family. Only OPA2322S part numbers include shutdown functionality. Therefore, OPA2322AIDGKT operates continuously when powered - quiescent current remains at 1.5 mA per channel with no disable mode. This simplifies design where always-on operation is required, such as in real-time sensor monitoring loops.

What is the typical input bias current of the OPA2322AIDGKT at 85°C?

The typical input bias current of the OPA2322AIDGKT is ±0.2 pA at 25°C and increases to ±400 pA maximum across –40°C to +125°C, as specified in Section 6.7 of SBOS538F. At 85°C, measured units typically exhibit <±50 pA, preserving high-impedance node integrity in pH probe or piezoelectric sensor interfaces without significant DC error.

Can the OPA2322AIDGKT be used in single-supply configurations with AC-coupled inputs?

Yes, the OPA2322AIDGKT is explicitly optimized for single-supply operation. Its rail-to-rail input stage accepts AC signals centered at mid-supply (e.g., 0.9 V on 1.8-V rail), and its output swings within 20 mV of both rails - enabling full dynamic range utilization in AC-coupled microphone preamps or vibration sensor conditioners without negative supply generation.