Frequency(Hz)

116

106

96

86

76

66

100k

1M

10M

50M

10MHzBandwidth

OPA657

(12pF)

l

-V

b

200k

V

O

0.1pF

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OPA657

SBOS197F – DECEMBER 2001 – REVISED AUGUST 2015

OPA657 1.6-GHz, Low-Noise, FET-Input Operational Amplifier

1 Features

3 Description

The OPA657 device combines a high-gain bandwidth,

1

•

High Gain Bandwidth Product: 1.6 GHz

low-distortion, voltage-feedback operational amplifier

•

High Bandwidth 275 MHz (G = 10)

with a low-voltage noise JFET-input stage to offer a

•

Slew Rate 700 V/µs (G = 10, 1-V Step)

very high dynamic range amplifier for high-precision

ADC (analog-to-digital converter) driving or wideband

•

Available in High Grade With Improved DC

transimpedance applications. Photodiode applications

Specifications

see

improved

noise

and

bandwidth

using

this

•

Operating Temperature Range: –40°C to 85°C

decompensated, high-gain bandwidth amplifier.

•

Low-Input Offset Voltage: ±250 µV

Very low level signals can be significantly amplified in

•

Low-Input Bias Current: 2 pA

a

single

OPA657

gain

stage

with

exceptional

•

Low-Input Voltage Noise: 4.8 nV/

√Hz

bandwidth and accuracy. Having a high 1.6-GHz gain

bandwidth product gives greater than 10-MHz signal

•

High-Output Current: 70 mA

bandwidths up to gains of 160 V/V (44 dB). The very

•

Fast Overdrive Recovery

low input bias current and capacitance supports this

performance

even

for

relatively

high

source

2 Applications

impedances.

•

Wideband Photodiode Amplifier

Broadband photodetector applications benefit from

•

Wafer Scanning Equipment

the low-voltage noise JFET inputs for the OPA657.

The JFET input contributes virtually no current noise

•

ADC Input Amplifier

while for broadband applications, a low voltage noise

•

Test and Measurement Front End

is also required. The low 4.8 nV/

√Hz input voltage

•

High Gain Precision Amplifier

noise provides exceptional input sensitivity for higher

bandwidth applications. The example shown below

•

Optical Time Domain Reflectometry (OTDR)

gives a total equivalent input noise current of 1.8

pA/

√Hz over a 10-MHz bandwidth.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

SOT-23 (5)

2.90 mm × 1.60 mm

OPA657

SOIC (8)

4.90 mm × 3.91 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Frequency Response of 200-k

Ω Transimpedance

Wideband Photodiode Transimpedance Amplifier

Amplifier

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.