LMV796QMFX/NOPB

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LMV796QMFX/NOPB: Application Field and Working Principle

The LMV796QMFX/NOPB is a high precision, low noise rail-to-rail differential amplifier with a power supply voltage range from 3.0V to 5.5V. It is a part of the Texas Instruments family of standard operational amplifiers and can be used in a linear-amplifier circuitry for applications such as low-voltage analog signal processing, instrumentation amplifiers, thermocouple amplifiers, oscilloscopes, and transimpedance amplifiers. The specific linear-amplifier, instrumentation, operational-amplifier, buffer-amplifier characteristics of the LMV796QMFX/NOPB make it a versatile choice for a variety of projects and applications where precision, noise, and power consumption are of particular importance.

Application Fields

Some of the more common applications fields for the LMV796QMFX/NOPB include:

• Acoustic instrumentation
• Low-noise electronic instrumentation
• Precision analog-digital conversion
• Precision lab measurement devices
• Thermocouple amplifiers
• Oscilloscopes

The LMV796QMFX/NOPB has low input voltage noise and common-mode voltage noise density, making it suitable for use in medical imaging, audio electronics, and providing input/output isolation in measurements or power supplies. It is also a good fit for in-circuit logic testing, since it can provide a low noise and low offset output that helps to reduce the number of additional components required to condition the output.

Working Principle

The LMV796QMFX/NOPB takes in a single-ended input signal and amplifies it with a differential amplifier. The output of the differentail amplifier is fed back to the inverting input of the amplifier, where it can be used to either adjust the gain or to provide additional gain stages. The differential input of the LMV796QMFX/NOPB allows it to reject noise and spurious signals on the input side of the amplifier, providing a much cleaner output stage.

To adjust the gain of the LMV796QMFX/NOPB, external resistors are connected to the gain-setting pins. The internal feedback resistors of the LMV796QMFX/NOPB are formed using a high performance MOS process, allowing for more precision and reproducibility. This helps to ensure the desired gain is achieved. Additionally, the LMV796QMFX/NOPB can be configured to provide bipolar or single-ended output.

For applications that require a lower distortion level, the LMV796QMFX/NOPB offers an optional post-amplifier stage that can provide up to 6dB of additional gain and up to 10 times lower distortion than the amplifier alone. This post-amplifier also features a noise-canceling circuit that eliminates the need for output de-emphasis or attenuation.

The LMV796QMFX/NOPB can also be used in bridge configurations for multi-channel applications, providing an easy and economical way to add gain to the incoming signal. This allows for improved linearity and signal-to-noise performance with minimal effort. The differential output of the LMV796QMFX/NOPB also allows for noise rejection on the output side of the amplifier.

Conclusion

The LMV796QMFX/NOPB is a high-precision, low-noise rail-to-rail differential amplifier that is suitable for a variety of applications in linear-amplifier instrumentation, operational-amplifier, and buffer-amplifier applications. Its ability to reject noise and spurious signals on the input side, combined with its adjustable gain and optional post-amplifier stage, makes it a versatile choice for a variety of precision projects and applications where the noise performance, offset, and power consumption are all of particular importance.

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