MAX9761ETI+

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The MAX9761ETI+ is a low power audio amplifier ideal for portable audio applications where power efficiency and small size are important factors. It offers high-power output with low distortion, low quiescent current, wide supply range and high current capability. Moreover, this low power audio amplifier supports digital volume control, low pop and click, low noise and low offset.

This low power amplifier comprises a high efficiency digital volume control, which offers up to 12-bit resolution and mute feature. It also includes an advanced, low dropout, pulse-width modulation linear regulator which reduces the pop and click when the amplifier is powered up. This low power audio amplifier offers wide bandwidth up to 200kHz and is capable of operating from 10kHz to 200kHz. The operating supply current can be adjusted from 2mV to 2V, with a maximum output swing of 6V peak-to-peak for a 0dB gain.

The MAX9761ETI+ also features low distortion and low quiescent current. The THD+N for the MAX9761ETI+ is minimised to eliminate clipping and saturation, resulting in excellent audio performance. The low quiescent current ensures a very low power consumption, making this amplifier perfect for battery-operated audio applications.

The working principle of the MAX9761ETI+ is quite simple and straightforward. The amplifier comprises of two stages: the input stage and the output stage. The input stage is used to convert the audio signal of variable amplitudes into a constant one. The output stage then amplifies this signal but keeps the same loudness of the audio signal for an entire range of operating conditions.

The input stage consists of voltage and current amplifiers, as well as a resistor network which helps in stabilising the supply current and reducing distortion by providing additional feedback. The output stage features two constant current sources, and a voltage amplifier, which together provide the final amplified sound. The output stage also includes a low-dropout regulator which helps reduce the pop and click during power-up.

The MAX9761ETI+ offers a wide variety of applications. It is suitable for use in all portable audio products, such as headphones, portable speakers, and personal audio products. It can be used as a power amplifier for AC-coupled and DC-coupled systems, as well as in automotive audio systems. The low quiescent current and wide supply range also make this amplifier perfect for low-power applications.

In conclusion, the MAX9761ETI+ is an ideal low power audio amplifier for portable audio applications. It offers high-power output with low distortion, low quiescent current, wide supply range and high current capabilities. With its advanced digital volume control and low pop and click features, it provides excellent audio performance and makes it perfect for both battery-operated and low-power applications.

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