MAX9856ETL+

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MAX9856ETL+ is a low power, cost-effective stereo audio CODEC from Maxim Integrated. It is classified as an interface CODEC and is used in a wide range of applications. This article will discuss the application field and working principle of MAX9856ETL+.

MAX9856ETL+ is ideally suited for many consumer audio applications, including portable and stationary audio equipment, home theater and multimedia systems, car audio systems, and various audio accessories. It also offers excellent features for other applications that require a low-power, flexible audio CODEC. With its battery management, integrated linear regulator, and I²C™/SPI™ interface, it can reduce total system cost, board space, and product development time.

The MAX9856ETL+ operates from single supply voltages of 2.7V to 5.5V. It also features a low-power shutdown mode that draws a mere 500nA. It integrates a headphone driver with charge pump and supports headphones up to 44ohm. The device integrates a Class-D speaker driver with a bridge-tied load (BTL) output, and supports 8ohm speakers at outputs up to 0.65W. It also includes mono microphone preamplifier with a programmable, 5-step gain that ranges from 0dB to 24dB. The MAX9856ETL+ is offered in a 16-pin TQFN package.

The MAX9856ETL+ is built around a low-noise, low-power integrated CODEC. Its CODEC comprises two voltage-controlled amplifiers (VCAs), two digitally controlled attenuators (DCAs), two analog-to-digital converters (ADCs), two digital-to-analog converters (DACs), and a serial audio interface (SAI). This combination enables the MAX9856ETL+ to provide stereo audio with good noise and distortion performance.

The two PCM inputs of the MAX9856ETL+ are routed to the two ADCs, which digitize the incoming audio signals. After digital control, the signals can be processed by one of the integrated digital signal process blocks, such as frequency parameter equalizers (FEPEs), spectral enhancement (SE), and a four-band equalizer. The processed signals are then routed to the two DACs where they are converted back to analog signals.

The analog outputs are then converted to digital using the embedded DCAs. This allows for levels, AGC, and bass/treble control. The audio outputs are fed to the integrated dual headphone drivers and speaker driver through the respective VCA/PDM switches. The integrated microphone preamplifier can also be used to capture audio signals.

A major benefit of the MAX9856ETL+ lies in its ability to provide integrated audio functions. With its advanced power management and I²C™/SPI™ interface, it can support multiple audio functions simultaneously with minimal power consumption. This makes it an ideal choice for providing integrated audio solutions in consumer, automotive, and other applications.

In conclusion, MAX9856ETL+ is an advanced audio CODEC from Maxim Integrated, designed for a wide range of applications. It integrates a low-noise, low-power CODEC with advanced signal processing, power management, and I²C™/SPI™ interface. It can provide integrated audio solutions with minimal power consumption and reduced system cost, board space, and product development time. Due to its flexibility, MAX9856ETL+ is classified as an interface CODEC.

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