MAX9737ETG+

MAX9737ETG+ Application Field and Working Principle

The MAX9737ETG+ low-noise, mono, Class D audio amplifier designed by Maxim Integrated Products is an efficient, digital power amplifier for portable audio applications. It is designed to bridge the gap between low-power stereo and high-power mono audio amplifiers.

The MAX9737ETG+ is an architecture of a Class D amplifier with a high efficiency, low-noise, and fixed gain functionality of up to 2-Watt (RMS). It includes a stereo input (line in, balanced left/right) configuration and is able to accept different audio signals, such as stereo and mono. Additionally, the audio amplifier derives its power from just a few external components, making it ideal for portable audio applications where battery life is important.

The MAX9737ETG+ amplifier is intended to drive single-ended output loudspeakers that have an impedance of 8 ohms or greater, delivering a maximum output power of 2 Watts (RMS) into a 4Ω load. The amplifier features an integrated low-pass filter that limits the audio bandwidth to 200kHz and an integrated output filter that minimizes audible distortion.

The MAX9737ETG+ amplifier is designed for excellent audio quality and transient response. The amplifier uses error amplifiers to monitor the pulsed output and to generate the control signals to maintain the pulse-width modulation (PWM) duty cycle. This technique delivers high efficiency while keeping the transients response looking “analog”, compared to band-limiting the PWM structure.

The MAX9737ETG+ comprises the following features: High efficiency Class D amplifier, power efficient audio amplifier, low-noise audio stage, stereo input configuration, integrated low-pass filter, integrated output filter, pulsed output, and power supplies for both line-level and Class D side.

In summary, the MAX9737ETG+ low-noise, mono, Class D audio amplifier is an efficient, digital power amplifier for portable audio applications. It features a high efficiency, low-noise, and fixed gain functionality of up to 2-Watt (RMS) into a 4Ω load, making it ideal for applications where battery life is important. The amplifier includes a stereo input (line in, balanced left/right) configuration that is capable of accepting different audio signals and is designed for excellent audio quality and transient response.