LMV794MA/NOPB

Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps

The LMV794MA/NOPB is a low voltage (2.7V to 5.5V) dual amplifier that integrates a low-noise, precision frequency-compensated amplifier, with wide gain-bandwidth, excellent CMRR and PSRR. It is able to deliver low-distortion audio signal amplification, making it ideal for instrumentation and consumer audio applications. This bipolar integrated circuit (IC) has a low power consumption, making it suitable for portable applications.

Application field

Despite its wide range of capabilities, the LMV794MA/NOPB is specially designed to be used in precision, low-noise instrumentation, audio and consumer applications. The wide gain-bandwidth is ideal for signal conditioning and amplifying; for instance, when simultaneously amplifying two signals. This can be used for measuring voltage or current levels, integrating, filtering and controlling audio circuits, or building analog-to-digital converters (ADCs).

The power amplifier function of LMV794MA/NOPB also makes it suitable for driving microphones or loudspeakers in stereo applications. Its precise control of audio signals renders it perfect for media and portable applications that require precise audio delivery. As such, it is particularly suited for a variety of demand applications, including:

• Headphones and headset amplifiers
• Home and portable audio systems
• Motor vehicle entertainment systems
• Pro Audio systems
• Wireless audio systems
• Medical diagnostics
• Motor control
• Power and voltage control

Working principle

The LMV794MA/NOPB is designed to be used in low voltage, low-noise, high-speed and low-power operations. It enables precision amplification in applications where noise is critical, since it has a wide gain-bandwidth and excellent CMRR and PSRR characteristics. The low voltage supply allows for compact multimedia applications working at lower power.

The LMV794MA/NOPB has dual operational amplifiers (op-amps) that enable good linearity with fast slew rates. This allows for signals to be accurately amplified or attenuated up to 10MHz in low-noise applications. External compensation is also available, which gives designers the capability to tailor the bandwidth and output response to the application, while allowing the operation of the amplifier in different frequency modes.

The amplifier can be operated in non-inverting, inverting and differential modes. Each of the op-amps feature a high open-loop gain, which results in excellent AC and DC stability. The load and/or gain stability can also be improved by simply connecting an external capacitor to the output. It also has an adjustable output power capability, allowing the amplifier to be used in various applications.

The LMV794MA/NOPB is also unique in that it matches its software with a choice of 3 power-saving modes. The Sleep mode enables a complete shutdown of the dual op-amps when not in use, resulting in a much lower power consumption than other similar devices. The Standby and Run mode differences allow the amplifier to be used in low power audio applications, since the low voltage supply reduces interference due to noise in higher power circuits. The dual op-amps can be powered up or down simultaneously, and the LMV794MA/NOPB automatically enters the Power Saving mode whenever the output is inactive for more than a few milliseconds.

Conclusion

The LMV794MA/NOPB has a wide variety of applications due to its low voltage and low-noise design. It is designed with wide gain-bandwidth, excellent CMRR and PSRR, precise control of audio signals and three power-saving modes. It is ideal for instrumentation and consumer audio applications, making it suitable for driving microphones or loudspeakers in stereo applications, and also suitable for media and portable applications that require precise audio delivery.