PDM Input Class D Audio Power Amplifier

Part Number	Status
MAX98356	Active: In Production.

The MAX98356 is a digital pulse-density modulated (PDM) input Class D power amplifier that provides Class AB audio performance with Class D efficiency. This IC offers five selectable gain settings (3dB, 6dB, 9dB, 12dB, and 15dB) set by a single gain-select input (GAIN).

The MAX98356 takes a stereo pulse density modulated (SPDM) input signal directly into the DAC. Data on the rising edge of PDM_CLK is considered left-channel data while data on the falling PDM_CLK edge is right channel. The IC can be configured to produce a left channel, right channel, or (left + right)/2 output from the stereo input data. The IC also features an extremely robust digital audio interface with very high wideband jitter tolerance (12ns typ) on PDM_CLK.

Active emissions-limiting, edge-rate limiting, and overshoot control circuitry greatly reduce EMI. A filterless spread-spectrum modulation scheme eliminates the need for output filtering found in traditional Class D devices and reduces the component count of the solution.

The IC is available in a 9-pin WLP package (1.345mm x 1.435mm x 0.64mm) and is specified over the -40°C to +85°C temperature range.

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