The single-channel OPA328, dual-channel OPA2328 and quad-channel OPA4328 (OPAx328) are a new generation family of precision, low-voltage CMOS operational amplifiers optimized for very low noise and wide bandwidth.
The OPAx328 have a linear input stage with zero-crossover distortion that delivers excellent common-mode rejection ratio (CMRR) of 120dB (typical) over the full input range. The input common-mode voltage range extends 100mV beyond the negative and positive supply rails. The output voltage typically swings within 10mV of the rails.
The OPAx328 also use Texas Instrument’s proprietary e‑trim™ operational amplifier technology, enabling a unique combination of ultra-low offset and low input offset drift without the need for any input switching or auto-zero techniques.
Low-noise (6.1nV/√Hz) and high-speed operation (40MHz, 30V/µs) make these devices a great choice for driving sampling analog-to-digital converters (ADCs).
The OPAx328 are also a great choice for high-impedance-input, single-supply applications. Low input bias current and low input capacitance allows for high-frequency transimpedance gains at low photocurrent operation (< 1nA).
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | OPAx328 Precision, 40MHz, 1pA, Low-Noise, RRIO, CMOS Operational Amplifiers With Shutdown datasheet (Rev. G) | PDF | HTML | Mar 9, 2026 |
| Analog design Journal | Selecting precision op amps as ADC drivers (Rev. A) | PDF | HTML | May 5, 2026 | |
| Application brief | Why Use an FDA to Drive an ADC? | PDF | HTML | Jan 8, 2026 | |
| White paper | Op Amp Offset Voltage and Bias Current Limitations | PDF | HTML | Nov 5, 2024 | |
| Circuit design | Bipolar-to-Unipolar Level Translator Circuit, ±12 V to 0 V to 5 V | PDF | HTML | Dec 18, 2023 | |
| White paper | Op Amp Input and Output Swing Limitations | PDF | HTML | Dec 7, 2023 | |
| Application note | Impact of Current Noise in CMOS and JFET Amplifiers | PDF | HTML | May 4, 2023 | |
| Application note | Reference-Buffer, ADC-Driver, and Transimpedance Applications for OPAx328 | PDF | HTML | Nov 19, 2022 |
For additional terms or required resources, click any title below to view the detail page where available.
The amplifier performance development kit (PDK) is an evaluation module (EVM) kit to test common operational amplifier (op amp) parameters and is compatible with most op amps and comparators. The EVM kit offers a main board with several socketed daughtercard options to fit package needs, allowing (...)
The analog engineer’s calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting operational-amplifier (...)
This folder contains three tools to help in understandning and managing noise in cicuits. The included tools are:
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOT-23 (DBV) | 5 | Ultra Librarian |
Recommended products may have parameters, evaluation modules or reference designs related to this TI product.
Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.
If you have questions about quality, packaging or ordering TI products, see TI support.