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OPA818IDRGR

TIOPA818IDRGR

Texas Instruments
J-FET Amplifier 1 Circuit 8-SON (3x3)
NRND6,050 in stock
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Overview

The OPA818IDRGR is a high-speed, decompensated JFET-input operational amplifier designed for wideband applications requiring extremely low input bias current. It features a massive 2.7 GHz gain bandwidth product and a 1400V/us slew rate, making it ideal for high-speed transimpedance stages. The JFET input stage provides a low input bias current of 25 pA and a low voltage noise density of 2.2 nV/rtHz.

Why Choose This Part

The OPA818 provides an exceptional balance of high-speed performance and low-noise JFET inputs, significantly reducing the noise floor in high-gain transimpedance configurations. Its decompensated architecture allows for higher bandwidth at gains of 7 V/V or higher, while the small 3x3mm WSON package minimizes parasitic inductance for stable high-frequency operation.

Applications

Optical Time-of-Flight (ToF)
Used as a transimpedance amplifier (TIA) to convert high-speed photodiode currents into voltage signals in LiDAR and range-finding systems.
High-Speed Photodiode Monitoring
Excels in precision optical power monitoring and fiber optic communication receivers where low noise and high bandwidth are critical.
Active Probes
Suitable for high-impedance oscilloscope probes and data acquisition front-ends due to its low input capacitance and high input impedance.
Particle Physics and Mass Spectrometry
Amplifying small current pulses from high-impedance sensors in laboratory instrumentation.

Key Specifications

Slew Rate 1400V/us
Mounting Type Surface Mount
-3db Bandwidth 765 MHz
Amplifier Type J-FET
Package / Case 8-WFDFN Exposed Pad
Current - Supply 26.5mA
Number of Circuits 1
Current - Input Bias 25 pA
Operating Temperature -40degC ~ 125degC (TA)
Gain Bandwidth Product 2.7 GHz
Voltage - Input Offset 1.25 mV
Supplier Device Package 8-SON (3x3)
Current - Output / Channel 110 mA
Voltage - Supply Span (Max) 13 V
Voltage - Supply Span (Min) 6 V

Getting Started

Designers should prioritize a tight PCB layout with a dedicated ground plane to manage the 2.7 GHz GBW. Use the OPA818DRGEVM evaluation module to test performance in various configurations. Ensure power supply bypassing is placed extremely close to the pins to prevent oscillations, especially given the decompensated nature of the amplifier.

Also Consider

LTC6268 Analog Devices - Features ultra-low bias current (femtamp range) for extremely high-impedance sensor interfaces.

Categories

Analog ICs > Op-Amps