LM4923LQ/NOPB

An audio amplifier is a type of amplifier that is specifically designed to amplify audio signal. Among the many audio amplifiers, the LM4923LQ/NOPB is a type of linear audio amplifier that is especially designed to provide high quality audio signal output with less noise. In this article, we will take a closer look at the LM4923LQ/NOPB application field and working principle so that you can have a better understanding of how this device can be used.

LM4923LQ/NOPB application field

The LM4923LQ/NOPB is a high performance, low power, stereo audio amplifier designed for applications such as portable multimedia, mobile phones, and set-top boxes. It takes in a single-ended analog signal as its input and provides two differential, high-performance outputs. The low power consumption of the amplifier make it highly versatile and suitable for use in many small and portable devices. With its small size of 5 mm x 4 mm, the device is well-suited for use in embedded applications and handheld devices.

The LM4923LQ/NOPB amplifier provides high gain, low noise, reduced levels of crosstalk and low distortion rates. It is equipped with a low-noise pre-amplifier, a headphone driver and a Class-D power amplifier in order to deliver high quality audio performance. Additionally, the amplifier also features a wide supply range with power supply operating ranges of 3.0V to 15V. It is also capable of driving up to 4 W into a 16 ohms speaker at 4.2 Vss.

With the help of the LM4923LQ/NOPB amplifier, audio systems can be designed with higher power efficiency and improved dynamic range. This device can easily replace conventional headphones amplifiers because of its high efficiency and small size, making it ideal for use in portable audio systems. Its features also make it suitable for applications such as Bluetooth headsets, wireless speakers, and portable CD players.

Working Principle

The LM4923LQ/NOPB amplifier consists of three stages: pre-amplification, power amplification, and headphone amplifiers. It is built with various amplifiers to deliver high performance across the audio bandwidth. At the heart of the amplifier is the pre-amplifier which takes in an input signal and produces a voltage gain. It then passes the amplified signal to the power amplifier stage where the voltage gain is further increased. The power amplifier then drives the output transistors which boosts the signal and converts the amplified voltage into substantial power.

The headphone amplifier is the last stage of the LM4923SLQ/NOPB audio amplifier where an additional voltage gain is applied to the amplified signal. This stage also provides the necessary load for the headphone avoiding any potential damage for the speaker. With the headphone amplifier stage combined with the device’s wide supply range, this amplifier can effectively drive headphones of 8 ohms to 600 ohms.

In addition to the adjustable gain and superior audio quality, the LM4923LQ/NOPB also features a shutdown mode that allows it to reduce its current consumption down to 50 nA. This feature makes the amplifier more energy efficient and suitable for battery-powered applications. Additionally, the device also offers several protection options against over-temperature, over-current, and over-voltage.

Conclusion

The LM4923LQ/NOPB is a versatile and efficient linear audio amplifier designed for wide range of application fields from portable multimedia to set-top boxes. It offers high-performance with low power consumption and small size. This device is capable of providing high gain and low distortion rates, making it ideal for applications that require superior audio performance. Furthermore, its adjustable gain and wide supply range make it suitable for a variety of audio systems. With its high performance and great features, the LM4923LQ/NOPB is an excellent choice for any audio amplification requirements.