MAX9867EWV+T

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MAX9867EWV+T is a low-power, stereo codec specially designed for portable audio applications. It includes a low-power audio ADC, a Line Input Boost (LIB) block that delivers a wide range of gains programmable up to 30 dB, and a stereo class-D speaker driver with integrated headphone amplifier. It is packaged in a 5-mm × 5-mm, 28-pin LLP package. The device is optimized for space-constrained and low-power designs and offers a flexible architecture for various applications.

The MAX9867EWV+T’s selectable width mono is a feature that allows for mono audio output in either mono or stereo mode. In mono mode, the maximum mono signal level is determined by the sum of the stereo input level, allowing for optimal signal-to-noise (SNR) performance. In stereo mode, the signal level remains constant regardless of the stereo input level. This Selectable Width Mono (SWM) feature improves performance of the device in low-noise environments.

The MAX9867EWV+T also includes two low-noise microphone preamplifiers (LNMPs) optimized for both MEMS microphones and externally-biased microphones. The LNMPs feature a low-noise preamplifier and adjustable gain up to 50 dB. Furthermore, the MAX9867EWV+T includes a stereo headphone amplifier with output powered rails adjustable up to 3.6 V and a maximum output power of 0.5 W/channel. The headphone amplifier is protected by a digital drive protection circuit, ensuring safe operation. Additionally, it features a low power-down supply current of 0.2 mA.

This device is very well suited for portable audio applications such as tablets, smartphones, digital cameras, portable media players, and similar devices, where size and power are keys. It is a great choice for adding stereo audio capability to applications requiring low power, small size, and superior audio performance.

Application Field of MAX9867EWV+T

MAX9867EWV+T is designed for applications requiring low-power stereo audio playback such as tablets, smartphones, digital cameras, portable media players, and similar devices. It is also well-suited for audio-related wearable applications that demand superior audio quality and low-power operation. The device features a flexible architecture, allowing for various applications in audio playback and voice input.

Working Principle of MAX9867EWV+T

The MAX9867EWV+T is an audio codec designed for low power and low noise audio applications. The primary function of the codec is to convert analog audio signals into digital signals and vice versa. The codec contains an Analog-to-Digital Converter (ADC) and a Digital-to-Analog Converter (DAC).

The ADC converts analog input signals into digital signals. The digital output of the ADC is sent to an amplifier or digital signal processor (DSP) where audio processing algorithms are performed. The processer then outputs the processed digital signals to the DAC which converts the digital signals back into analog form. The DAC then outputs the analog audio signals to an audio power amplifier.

The MAX9867EWV+T also contains a line input boost block which delivers a wide range of gains programmable up to 30 dB. Additionally, the codec features two low-noise MIC preamplifiers, a stereo class-D speaker driver, and a stereo headphone amplifier. The low-noise microphone preamplifiers are optimized for both MEMS microphones and externally-biased microphones. The MAX9867EWV+T also features a selectable width mono (SWM) feature which allows for mono audio output in either mono or stereo mode. This enhances performance of the device in low-noise environments.

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