OPA379AIDRG4

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OPA379AIDRG4 Application Field and Working Principle

The OPA379AIDRG4 is a rail-to-rail, low-power amplifier that is part of the linear amplifiers family, classified as an instrumentation, OP amp, and buffer amplifier. It is a low power CMOS implementation of the amplifier, ideal for applications that require an extended dynamic range, voltage and temperature stability with high linearity. The amplifier has very low input offsets, low input bias currents, and low power consumption making it favourable for applications needing to operate on batteries.

Input Characteristics

The OPA379AIDRG4 is a two-stage amplifier optimized to operate with a typical supply of ???≚??V and three power pins: a ??v+??V supply, ??v–??V supply, and ???v+??V supply. It offers superior input characteristics due to its Configurable Common-mode Voltage (CVI) pin, which makes it able to operate from dual supplies, or a single supply and an adjustable supply from the CVI pin. With the same pin you can also configure the output offset voltage of the amplifier.

Moreover, it features ESD protection on both input pins to protect the amplifier from electrical stresses. It also features a temperature compensation circuit on the input, which permits low offset drift versus temperature.

Output Characteristics

The OPA379AIDRG4 is a rail-to-rail output amplifier, meaning the output voltage can reach the rails of the supply voltage. This is especially helpful in automotive, industrial and audio applications. Furthermore, the amplifier can drive up to ???mA at VS=??V, thus it can be used to provide a reasonable amount of current to devices connected to it.

Internal Construction

The OPA379AIDRG4 is internally made up of several transistors, which are connected in a complementary configuration. Two P-channel transistors and two N-channel transistors form the input stage, which increases the voltage swing at the output when compared to the input. The second stage consists of an N-channel enhancement-mode MOSFET, which functions as the output stage. This stage has no gate voltage to establish the transition between the low and the high states. By improving the slew rate of the amplifier, this increases the speed at the at which it is able to transition between its two states.

Applications

The OPA379AIDRG4 is suitable for a variety of applications, including automotive, medical, industrial, and audio applications. Its precision and low offset allows it to be used in systems that require precise instrumentation or measuring. Its low power consumption and rail-to-rail output make it suitable for audio applications. Furthermore, its ESD protection and temperature-compensated input make it suitable for automotive and industrial applications.

Working Principle

The OPA379AIDRG4 is an amplifier that amplifies the signal differences between its two input pins. When the input voltage of the amplifier is higher than the reference voltage, the output of the amplifier increases. Similarly, when the input voltage is lower than the reference voltage, the output of the amplifier decreases. The gain of the amplifier controls the magnitude of the increase or decrease with respect to the input voltage difference. By adjusting the gain, the OPA379AIDRG4 can amplify smaller signals. The values of offset, bias current, and power consumption can be further adjusted by connecting external components to the amplifier.

In conclusion, the OPA379AIDRG4 is an ideal amplifier for a variety of applications due to its low power consumption, rail-to-rail output, adjustable common-mode voltage, and low offset. It is designed for low-voltage applications and features protection from electromagnetic and electrostatic stressing, making it suitable for applications in the automotive and industrial fields. Its precision and low offset, combined with the adjustable gain of the amplifier make it suitable for instrumentation, measurement and audio applications.

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