The OPA227 and OPA228 series op amps combine low noise, wide bandwidth and high precision to make them the ideal choice for applications requiring both ac and precision dc performance. The OPA227 is unity-gain stable and features high slew rate (2.3V/µs) and wide bandwidth (8MHz). The OPA228 is optimized for closed-loop gains of 5 or greater, and offers higher speed with a slew rate of 10V/µs and a bandwidth of 33MHz. The OPA227 and OPA228 series op amps are ideal for professional audio equipment. In addition, low quiescent current and low cost make them ideal for portable applications requiring high precision. The OPA227 and OPA228 series op amps are pin-for-pin replacements for the industry standard OP-27 and OP-37 with substantial improvements across the board.
The OPA227/OPA228 series combines low noise, wide bandwidth, and high precision, making it suitable for audio, telecom, data‑acquisition, and instrumentation applications. The series offers single, dual, and quad configurations and replaces legacy parts such as the OP‑27 and OP‑37.
These amplifiers are offered in DIP‑8, SO‑8, DIP‑14, and SO‑14 packages, operate from –40 °C to +85 °C, and support supply voltages from ±2.5 V to ±18 V. Detailed performance curves, absolute maximum ratings, and mechanical drawings are provided in the following pages.
| Low Noise | 3 nV/√Hz |
|---|---|
| Bandwidth (OPA227) | 8 MHz |
| Bandwidth (OPA228) | 33 MHz |
| Slew Rate (OPA227) | 2.3 V/µs |
| Slew Rate (OPA228) | 10 V/µs |
| Operating Temperature Range | –40 °C to +85 °C |
| Open‑Loop Gain | 160 dB |
| CMRR | 138 dB |
| Short‑Circuit Current | ±45 mA |