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Analog Devices Inc. MAX9838x Digital Input Class-D Amplifiers feature integrated IV feedback and Brownout Protection in a small 2.93mm2, 16-pin WLP (0.4mm pitch) space-saving package. With a wide 2.3V to 10V supply voltage range, these amplifiers pair Class-AB level audio performance with the efficiency needed to extend battery life in single-cell, two-cell, and externally regulated/boosted portable applications. MAX98388 is optimized for up to 5.5V applications (single-cell), while the MAX98389 is optimized for 5V to 10V cases (two-cell).
Data collected by a precision output current sense channel and an output voltage feedback channel transmits on the audio data output. This transmission enables algorithms such as audio enhancement, bass boosting, speaker protection, and haptic functions to be run on the host audio DSP. Active emissions limiting (AEL) and edge-rate limiting circuitry combined with a spread-spectrum modulation (SSM) scheme
reduce EMI and eliminate the need for output filtering. A programmable threshold playback channel ALC provides brownout protection for batteries in portable systems and robust thermal/overcurrent protection to prevent device damage.
The ADI MAX9838x Digital Input Class-D Amplifiers provide a PCM interface for audio playback and IV feedback data. Then pair the PCM interface with a standard I2C interface for device control/status readback. The PCM interface also supports audio data formats such as I2S, left justified, and TDM timing. A unique clocking structure eliminates the need for an external high-frequency reference clock. In addition to reducing device size and pin count, eliminating this clock saves interface power while reducing the risk of EMI from high-speed switching and potential board coupling issues.
