MAX9741ETN+

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Audio amplifiers are designed to take a small signal and increase it so that it can be heard over the loud speakers. The MAX9741ETN+ Audio Amplifier does this, amplifying low-level audio signals for speaker and power amplifier drive. This article looks at the MAX9741ETN+ application field and working principle.

Application Field

The MAX9741ETN+ Audio Amplifier has been designed for use in a wide range of applications from automotive audio systems to cell phones, portable media players, tablets and notebook PCs. It is a complete system-on-a-chip (SOC) solution for delivering quality stereo sound for mobile applications. It integrates stereo gain, headphone volume control and a low-power standby mode in a highly integrated circuit.

The MAX9741ETN+ Audio Amplifier is capable of operating from a voltage range of 2.5V to 5V and can provide a maximum gain of 32dB when operated in the stereo mode. It also provides headphone volume control with up to 25dB of variable gain, allowing the user to adjust the sound level to their own preference. In addition, the MAX9741ETN+ Audio Amplifier also provides a low-power standby mode, reducing the system power consumption in applications where the audio circuit is not in use.

Working Principle

The MAX9741ETN+ Audio Amplifier is a stereo fully-differential amplifier which amplifies audio signals from line-level inputs and then drives stereo headphone speakers and power amplifier outputs. The circuit consists of two separate stages, the input stage and the output stage.

The input stage consists of two pairs of differential input amplifiers, connected in parallel. The two differential amplifier pairs each consist of an N-channel MOSFET input stage and a P-channel MOSFET cascode stage. The input stage amplifies the differential audio signals and delivers them to the output stage.

The output stage consists of a complementary PNP / NPN differential amplifier pair, designed to drive the stereo headphone speakers and a power amplifier output. This stage uses a voltage-controlled current-source, with an integrated resistor ladder, to control the output current. This allows for the gain of the output stage to be adjusted for the desired output level.

The MAX9741ETN+ Audio Amplifier also includes an integrated headphone volume control system, which allows the user to fine-tune the output sound level. This is accomplished by varying the voltage level at the output of the differential amplifier pair in the output stage. By varying the voltage level at the output, the user can change the amount of current delivered to the headphones, thereby adjusting the sound level.

The MAX9741ETN+ Audio Amplifier also includes a low-power standby mode, which reduces the power consumption of the system when the audio signal is not being used. The standby mode is triggered when the signal level at the inputs is below a certain threshold level. This reduces power consumption of the audio circuitry and allows the system to run in a low-power state.

Conclusion

The MAX9741ETN+ Audio Amplifier is a highly integrated solution for amplifying low-level audio signals for stereo headphone speakers and power amplifier outputs. It is capable of providing up to 32dB of gain in the stereo mode and includes an integrated headphone volume control system. It also includes a low-power standby mode, reducing the power consumption of the system when audio signals are not present. This is an ideal solution for audio amplification applications in mobile devices.

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