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 |
| Application brief | Why Use an FDA to Drive an ADC? | PDF | HTML | Jan 8, 2026 | |
| Application brief | Zero-crossover Amplifiers: Features and Benefits (Rev. B) | PDF | HTML | Nov 8, 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.
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| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| VSSOP (DGK) | 8 | Ultra Librarian |
| WSON (DRG) | 8 | Ultra Librarian |
| DSBGA (YBJ) | 24 | Ultra Librarian |
| SOIC (D) | 8 | Ultra Librarian |
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