THS3091DDARG3

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THS3091DDARG3 Application Field and Working Principle

The THS3091DDARG3 from Texas Instruments is an operational amplifier (Op-Amp) that belongs to the family of instrumentation, general purpose Op-Amps, buffers and linear amplifiers. This device is a dual-channel, low voltage, rail-to-rail output amplifier. The device is designed to deliver maximum output current-drive of 140mA making it suitable for driving a wide range of loads, while offering a high level of unity-gain stability and ultra-low noise figures.

Features

• Low voltage: the device operates from a single +1.8V to +5.5V power supply
• High output current: 140mA
• High output voltage swings: the output can reach rail-to-rail levels
• High common-mode voltage range: up to GND-0.2V and up to VDD+0.2V
• High speed: the device requirement from 0.8 to 1V of supply with a -3dB bandwidth of 2.8MHz
• High power supply rejection ratio: 60dB
• Low noise: only 0.8μVrms and 72nV/√Hz of noise are achieved

This particular type of Op-Amp becomes useful in automotive and industrial designs due to its high performance, low voltage operation and wide operating temperature range. The device is a common choice component in various signal condition applications such as signal amplification, isolation and level shifting, in video signal processing systems such as video cameras, CCTV surveillance and vehicle telematics, in current-mirroring, and in 4-20mA current loops for data acquisition.

Working Principle

The device incorporates two independent, high-gain, internally-compensated amplifiers with bipolar input structures and CMOS output stages. An underground current path provides the bias current for the entire circuit from the single supply. The low-voltage, rail-to-rail output stages can drive up to 140 mA. The input impedance is extended by an internal FET, therefore, almost any circuit configuration will be feasible, regardless of the applied load.

The frequency compensation is designed to reduce the gain and the phase margin at higher frequency, while the input buffer is designed to maintain the maximum slew rate and to reject generators and power-line signals. Because of its high input impedance, the Op-Amp can also be used in cascode configurations.

The THS3091DDARG3 Op-Amp features low offset voltage, offset voltage temperature coefficient and input bias currents, and thus, it can perform better even at the lowest input signal frequencies. It also provides a good performance in terms of power supply rejection, making it suitable for even noisy supply lines.

Conclusion

The THS3091DDARG3 is an operational amplifier (Op-Amp) that belongs to the family of instrumentation, general purpose Op-Amps, buffers and linear amplifiers. The device is a dual-channel, low voltage, rail-to-rail output amplifier. It incorporates two independent, high-gain, internally-compensated amplifiers with bipolar input structures and CMOS output stages; and with a high level of unity-gain stability, ultra-low noise figures and a maximum output current-drive up to 140mA. This type of Op-Amp is suitable for automotive and industrial applications, signal amplification, isolation and level shifting, video signal processing, current-mirroring and 4-20mA current loops.

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