LM4923MMX/NOPB

LM4923MMX/NOPB application fields and working principles

The LM4923MMX/NOPB is a member of the LM4923 audio amplifier IC family and is a dual-output monaural amplifier. It is widely used in modern audio systems due to its high performance, stable and low distortion characteristics. This article will focus on LM4923MMX/NOPB application field and working principle.

Application field

LM4923MMX/NOPB is biased in standard class AB operation and can supply up to 45 mW per channel (with 10KΩ/450 mV signal source) of continuous output power. The devices are targeted for driving high quality mobile, Bluetooth and other audio devices. It is also suitable for low power embedded audio applications.

For optimal audio performance, the LM4923MMX/NOPB amplifier can be tuned using small external components. It has minimum gain of 6dB, low potential of 0.02%, low noise and low harmonic distortion. The device has unique input configurations that operate on gain settings from 1dB to 6dB and have an additional input stage to provide varied gain characteristics.

Working principle

The LM4923MMX/NOPB is an integrated circuit that implements a single or dual channel power amplifier. The IC has a nice temperature controlled biasing scheme built into its architecture that allows it to achieve excellent operating performance in a wide variety of applications. The patented amplifier architecture inside theLM4923MMX/NOPB provides a high level of unity gain stability and flat frequency response. The amplifier features a high common mode rejection ratio and low open loop distortion.

The input stage for the LM4923MMX/NOPB is composed of an inverting amplifier followed by a gain setting stage and a level detection circuit. The output stage is realized by two complementary output transistors and is biased to a class AB operation. The biasing circuitry contains voltage references, an offset generating circuit and an adjustable current generator which helps in controlling Iq by operating temperature.

The output of the LM4923MMX/NOPB is protected against the load short circuit by the current limiting circuit which maintains the output current at its maximum safe limit. The output of the circuit is available through the output terminals and this voltage is used to drive the speakers. The LM4923MMX/NOPB is extremely flexible and can be used in various applications, such as audio systems, telecommunication systems and consumer electronics.

Conclusion

The LM4923MMX/NOPB is a dual-channel mono audio amplifier IC that is ideal for use in audio applications such as mobile phones and other audio systems. It has a high common mode rejection ratio and low open loop distortion, and its biasing circuit allows temperature control. It also has a current limiter to protect against short circuits and additional input stages which allows for different gains. The LM4923MMX/NOPB is a versatile audio amplifier IC which can be used in a variety of applications.