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LMV932MA Application Field and Working Principle

The LMV932MA is an enhanced low voltage, rail-to-rail, single-supply amplifier with an extremely low noise input stage, designed for use in a variety oflinear and instrumentation applications, such as medical instrumentation, audio and video equipment, consumer and industrial electronics, automotive audio systems, and data acquisition systems. The device features rail-to-rail input and output capability and provides superior DC accuracy and ultra-low power consumption.

Features

• Very Low Supply Current: 590µA (Typical) @ 3V.
• Wide Supply Voltage Range: 1.8V to 6.0V
• Rail-to-Rail Input and Output Operation
• Low Input Offset Voltage: 1.5mV (Typ.
• Low Input Voltage Noise: 0.9nV/√Hz (Typ.)

Applications

• Medical Instrumentation: ECG, EEG, Audiology
• Data Acquisition Systems
• Programmable Logic Controllers
• Automatic Test Equipment
• Industrial and Consumer Electronics
• Portable Instrumentation
• Automotive Audio Systems
• Audio and Video Equipment

Working Principle

The LMV932MA bipolar op amp is based on a conventional three-stage topology structure and consists of one single-ended input stage, one differential amplifier stage and one output stage. Single-ended input stage is a source- follower configuration consisting of transistor M2, M4 and M6. The bias current flowing through the transistors M1 and M3 is tailored to match the total bias current of the other two stages. The differential amplifier stage consists of two emitter-follower transistors, M10 and M11, in a class A configuration and a common-emitter transistor, M9, providing additional gain and output current. The output stage is the single-ended emitter-follower stage with the emitter follower transistor, M12. This emitter-follower stage provides additional current drive and also helps to maintain stability. The input and output stages of the LMV932MA have rail-to-rail capability, allowing the device to accommodate a wide input/output range.

The LMV932MA combines low input bias current and low input offset current to provide a wide range of bias-free operation. The device is designed to work over a wide supply voltage range of 1.8V to 6.0V, making it suitable for a variety of low voltage applications. The LMV932MA also provides a very low power consumption of 590µA (Typical) and has a low input noise voltage of 0.9nV/√Hz (Typical), making it ideal for low-noise applications.

Conclusion

The LMV932MA is a low voltage, rail-to-rail, single supply amplifier with extremely low noise input stage and high accuracy. Its wide supply voltage range, low power consumption, and low noise make it suitable for a variety of linear and instrumentation applications such as medical instrumentation, audio and video equipment, consumer and industrial electronics, automotive audio systems, and data acquisition systems.

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