FEATURES

- 400MHz UNITY GAIN BANDWIDTH
- LOW INPUT BIAS CURRENT: 5pA
- HIGH INPUT IMPEDANCE: 1012W || 1.0pF
- ULTRA-LOW dG/dP: 0.006%/0.009¡Æ
- LOW DISTORTION: 90dB SFDR at 5MHz
- FAST SETTLING: 17ns (0.01%)
- HIGH OUTPUT CURRENT: 60mA
- FAST OVERDRIVE RECOVERY


APPLICATIONS

- WIDEBAND PHOTODIODE AMPLIFIER
- PEAK DETECTOR
- CCD OUTPUT BUFFER
- ADC INPUT BUFFER
- HIGH SPEED INTEGRATOR
- TEST AND MEASUREMENT FRONT END


DESCRIPTION
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 transimpedance 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/ÖHz input voltage noise to achieve a very low integrated noise in wideband photodiode
transimpedance applications. Broad transimpedance bandwidths are achievable given the OPA655¡¯s high 240MHz gain bandwidth product.
As shown below, a –3dB bandwidth of 1MHz is provided even for a high 1MW transimpedance gain
from a 47pF source capacitance.