TLV379IDBVT Integrated Circuits (ICs)

TLV379IDBVT Application Field and Working Principle

The TLV379IDBVT (Thermally Enhanced Low Voltage Operational Amplifier) is a monolithic instrumentation amplifier with low offset and low input bias currents, as well as high gain linearity and extreme dc accuracy. It is best suited for applications such as the amplification of electrode signals, temperature sensing, and strain gauge sensing in systems such as industrial process automation and medical devices.

Overview

The TLV379IDBVT is designed for both single supply and dual supply operation. It can be powered from a single supply voltage ranging from +4.5V to +36V, or from a dual supply voltage ranging from ±2.25V to ±18V. This part utilizes 3rd-order THA architecture with a single 20-V/µs transconductance amplifier stage and a pair of BDT (Bias Drive Transistor) cascodes that minimize the signal path power supply sensitivity while preserving the common-mode input range and low noise performance.

Features

The TLV379IDBVT offers many features, including:

• Low Input Offset Voltage/Low Input Bias Current
• Wide Supply Range: Single Supply: 4.5–36V; Dual Supply: ±2.25–±18V
• High Gain Linearity: ±0.04% max
• Low Noise: 8µV max at 1kHz
• High CMRR: 97 dB min

Applications

The TLV379IDBVT is a perfect choice for applications such as

• Industrial Process Automation
• Medical Devices
• Amplification of Electrode Signals
• Temperature Sensing
• Strain Gauge Sensing

Working Principle

The TLV379IDBVT is an integrated amplifier in which the input signals are applied to the high input impedance op-amps and the output is obtained from these op-amps. These op-amps provide gain and current-to-voltage conversion. The op-amp also provides a common-mode gain to the input signals. The two input signals are then amplified and their sum is obtained. The output is then delivered through the power supply.

The TLV379IDBVT also provides a current-to-voltage conversion function, which is the reason for its low noise and precise regulation of output voltage. The current-to-voltage conversion is performed by the transconductance amplifier, which is connected between the input signals and the power supply. The transconductance amplifier uses an n-channel MOSFET that is controlled by an external voltage. The transconductance amplifier works by providing an output voltage that is proportional to the input current.

The TLV379IDBVT has two main functions: input voltage amplification and current-to-voltage conversion. The input voltage amplification is performed by the op-amps and provides a gain of up to 1000V/V. The current-to-voltage conversion is performed by the transconductance amplifier and provides a low noise conversion of input current to a voltage that can be used to accurately regulate the output voltage.

Conclusion

The TLV379IDBVT is a monolithic instrumentation amplifier with low offset and low input bias current, as well as high gain linearity and extreme dc accuracy. It is suitable for use in applications such as industrial process automation, medical devices, amplification of electrode signals, temperature sensing, and strain gauge sensing. The TLV379IDBVT is an integrated amplifier with three main functions: input voltage amplification, current-to-voltage conversion and common-mode gain. The amplifier provides an output voltage that is proportional to the input current and is capable of accurately regulating the output voltage with low noise performance.