The OPA227 and OPA228 series op amps combine low noise and wide bandwidth with high precision to make them the ideal choice for applications requiring both ac and preci- sion dc performance. The OPA227 is unity-gain stable and features high slew rate (2.3V/µs) and wide bandwidth (8MHz). The OPA228 is opti- mized 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 applica- tions 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 dual channel versions provide higher output current and higher output swing.
The OPA227 and OPA228 families are low‑noise, high‑precision operational amplifiers offered in single, dual and quad packages. They provide wide bandwidth (8 MHz for OPA227, 33 MHz for OPA228) and low offset voltage, making them suitable for audio, data‑acquisition, telecom and instrumentation applications.
The devices operate from a wide supply range of +2.5 V to +18 V, feature low input bias current (10 nA max) and high common‑mode rejection (138 dB). Detailed electrical specifications, absolute maximum ratings, mechanical dimensions and typical performance curves are provided in this datasheet.
| Low Noise | 3 nV/√Hz |
|---|---|
| Bandwidth (OPA227) | 8 MHz |
| Bandwidth (OPA228) | 33 MHz |
| Supply Voltage Range | +2.5 V to +18 V |
| Input Bias Current | 10 nA max |
| CMRR | 138 dB |
The devices operate from +2.5 V up to +18 V.
The input bias current is specified as 10 nA maximum.
OPA227 has a typical gain‑bandwidth product of 8 MHz.
They achieve a low noise density of 3 nV/√Hz.