OPA657 Texas Instruments TI pdf datasheet download

OPA657

1.6GHz, Low-Noise, FET-Input
OPERATIONAL AMPLIFIER

FEATURES
HIGH GAIN BANDWIDTH PRODUCT: 1.6GHz
HIGH BANDWIDTH 275MHz (G = +10)
LOW INPUT OFFSET VOLTAGE: ±0.25mV
LOW INPUT BIAS CURRENT: 2pA
LOW INPUT VOLTAGE NOISE: 4.8nV/ Hz
HIGH OUTPUT CURRENT: 70mA
FAST OVERDRIVE RECOVERY

APPLICATIONS
WIDEBAND PHOTODIODE AMPLIFIER
WAFER SCANNING EQUIPMENT
ADC INPUT AMPLIFIER
TEST AND MEASUREMENT FRONT END
HIGH GAIN PRECISION AMPLIFIER

DESCRIPTION
The OPA657 combines a high gain bandwidth, low distortion,
voltage-feedback op amp with a low voltage noise JFET-input
stage to offer a very high dynamic range amplifier for high
precision ADC (Analog-to-Digital Converter) driving or wideband
transimpedance applications. Photodiode applications will see
improved noise and bandwidth using this decompensated,
high gain bandwidth amplifier.
Very low level signals can be significantly amplified in a single
OPA657 gain stage with exceptional bandwidth and accuracy.
Having a high 1.6GHz gain bandwidth product will give
> 10MHz signal bandwidths up to gains of 160V/V (44dB). The
very low input bias current and capacitance will support this
performance even for relatively high source impedances.
Broadband photodetector applications will benefit from the low
voltage noise JFET inputs for the OPA657. The JFET input
contributes virtually no current noise while for broadband
applications, a low voltage noise is also required. The low
4.8nV/ Hz input voltage noise will provide exceptional input
sensitivity for higher bandwidth applications. The example
shown below will give a total equivalent input noise current of
1.8pA/ Hz over a 10MHz bandwidth.

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