MAX98371

MAX98371 EVALUATION KIT AVAILABLE Digital Input Class D Speaker Amplifier with Dynamic Headroom Tracking General Description The MAX98371 is a high-efficiency, mono Class D audio amplifier featuring dynamic headroom tracking (DHT). DHT automatically optimizes the headroom available to the Class D amplifier as the power supply voltage varies, due to sudden transients and declining battery life to maintain a consistent listening experience. A wide 5.5V to 18V supply range allows the device to reach 19W into an 8Ω load. The MAX98371’s flexible digital audio interface (DAI) supports I2S, left-justified, and TDM formats. The digital audio interface accepts 32kHz, 44.1kHz, 48kHz, 88.2kHz, and 96kHz sample rates with 16-/24-/32-bit data supported for all data formats. In TDM mode, the device can support up to 16 channels of audio data. A unique clocking structure eliminates the need for an external MCLK signal that is typically needed for PCM communication. This reduces pin count and simplifies board layout. Active emissions limiting with edge rate control minimizes EMI, and eliminates the need for output filtering found in traditional Class D devices. An 8-bit PVDD supply voltage ADC enables the Dynamic Headroom Tracking circuit. DHT optimizes audio program peak behavior as the supply voltage varies and provides flexible user-defined parameters. Thermal foldback protection ensures robust behavior when the thermal limits of the device are exercised. The circuit can be enabled to a...