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OPA657U

TIOPA657U

Texas Instruments
JFET-input, very low-noise high-speed amplifier often used for photodiode front ends and low-noise buffering.
NRND1,153 in stock
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Overview

The OPA657U is a high-speed, voltage-feedback operational amplifier featuring a JFET input stage for extremely low input bias current and low voltage noise. With a gain bandwidth product of 1.6 GHz and a high slew rate of 700V/us, it is optimized for wideband transimpedance applications and high-frequency signal conditioning.

Why Choose This Part

The combination of a 1.6 GHz gain bandwidth and 4.8 nV/rtHz voltage noise makes it ideal for high-gain, high-frequency stages. Its JFET architecture provides a significantly lower noise floor than bipolar amplifiers in high-impedance applications while maintaining a 700V/us slew rate.

Applications

High-Speed Photodiode Transimpedance Amplifier
Utilizes the 1pA input bias current and high bandwidth to convert low-level optical signals into measurable voltages with minimal noise.
Laser Diode Monitoring
Provides the fast overdrive recovery and high slew rate necessary for monitoring pulse-based laser systems.
Low-Noise Capacitive Sensor Interfacing
The JFET input stage allows for high-impedance buffering of capacitive sensors in industrial instrumentation.
Active Filter Design
Enables high-order, high-frequency active filters in communications and medical imaging equipment.

Key Specifications

Slew Rate 700V/us
Mounting Type Surface Mount
-3db Bandwidth 350 MHz
Amplifier Type Voltage Feedback
Package / Case 8-SOIC (0.154", 3.90mm Width)
Current - Supply 14mA
Number of Circuits 1
Current - Input Bias 1 pA
Operating Temperature -40degC ~ 85degC
Gain Bandwidth Product 1.6 GHz
Voltage - Input Offset 100 uV
Supplier Device Package 8-SOIC
Current - Output / Channel 70 mA
Voltage - Supply Span (Max) 12 V
Voltage - Supply Span (Min) 8 V

Getting Started

Designers should use a low-impedance ground plane and minimize parasitic capacitance at the inverting input to maintain stability at high frequencies. Texas Instruments offers the OPA657EVM evaluation module for characterization, and TINA-TI or PSpice models are recommended for simulating stability margins in transimpedance configurations.

Also Consider

LTC6268 Analog Devices - Features even lower input capacitance and femtoamp-level bias current for specialized ultra-high impedance sensors.

Categories

Analog ICs > Op-Amps Audio & Video > Camera & Imaging