Texas Instruments OPA655U

Wideband FET-Input Operational Amplifier 8-SOIC

Operational Amplifier, 1 Func, 2000uV Offset-Max, BICMOS, PDSO8

The OPA655 combines a very wideband, unity gain stable, voltage feedback op amp with a FET input stage to offer an ultra high dynamic range amplifier for ADC buffering and trans impedance applications. Extremely low harmonic distortion along with excellent pulse settling characteristics will support even the most demanding ADC input buffer requirements. The broad unity gain stable bandwidth and FET input allows exceptional performance in high speed, low noise integrators. The high input impedance and low bias current provided by the FET input is further supported by the ultra-low 6nV/O"Hz input voltage noise to achieve a very low integrated noise in wideband photodiodetransimpedance applications. Broad trans impedance bandwidths are achievable given the OPA655's high 240MHz gain bandwidth product. As shown below, a -3 Db bandwidth of 1MHz is provided even for a high 1M\Omega trans impedance gain from a 47pF source capacitance.