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OPA847ID

TIOPA847ID

Texas Instruments
Low-noise, wide-bandwidth amplifier commonly used for precision high-speed buffering and ADC drive in video and instrumentation.
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Overview

The OPA847ID is a very wideband, ultra-low noise voltage-feedback operational amplifier designed for high-speed signal processing. It features a gain-bandwidth product of 3.9 GHz and an exceptionally low input voltage noise of 0.85 nV/rtHz, making it ideal for precision high-frequency applications. The device operates on a supply range of 4.5V to 6V and includes a power-saving shutdown feature.

Why Choose This Part

The primary advantage of the OPA847ID is its combination of a massive 3.9 GHz gain-bandwidth product and a 950 V/us slew rate, which allows for high-fidelity reproduction of fast pulses. Its ultra-low 0.85 nV/rtHz noise floor makes it one of the quietest voltage-feedback amplifiers available for high-gain stages. Additionally, the low 100 uV input offset voltage ensures high DC precision alongside AC performance.

Applications

Transimpedance Amplifiers
Used as a high-speed preamplifier for photodiode sensors where extremely low noise and high bandwidth are required to maintain signal integrity.
ADC Driving
Functions as a high-speed buffer to drive the input of high-resolution analog-to-digital converters in instrumentation and video systems.
Medical Imaging
Utilized in ultrasound and imaging front-ends where low input offset voltage and high slew rates are critical for signal accuracy.
Wideband Receivers
Employed in communication systems to amplify high-frequency signals with minimal distortion and noise floor contribution.

Key Specifications

Slew Rate 950V/us
Mounting Type Surface Mount
Amplifier Type Voltage Feedback
Package / Case SOT-23-6
Current - Supply 18.1mA
Number of Circuits 1
Current - Input Bias 19 uA
Operating Temperature -40degC ~ 85degC
Gain Bandwidth Product 3.9 GHz
Voltage - Input Offset 100 uV
Supplier Device Package SOT-23-6
Current - Output / Channel 100 mA
Voltage - Supply Span (Max) 12 V
Voltage - Supply Span (Min) 5 V

Getting Started

When designing with the OPA847ID, ensure a low-impedance power supply bypass is located immediately adjacent to the SOIC-8 pins to prevent high-frequency oscillations. Given its high bandwidth, PCB layout must minimize parasitic capacitance at the inverting input node. Evaluation can be performed using the TI universal op-amp evaluation modules or by following the high-speed layout guidelines provided in the TI documentation.

Also Consider

OPA657U TITexas Instruments - A JFET-input alternative that provides lower input bias current for high-impedance sensor applications while maintaining high bandwidth.
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