EVALUATION KIT AVAILABLE MAX98358 PDM Input Class D Audio Power Amplifier General Description The MAX98358 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 IC
can be configured to produce a left channel, right channel,
or (left/2 + right/2) output from the stereo input data.
The MAX98358 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.
A mono sum feature is also implemented with SPDM data
input by summing the data from both rising and falling
clock edges.
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. Features в—Џв—Џ Single-Supply Operation (2.5V to 5.5V)
в—Џв—Џ 3.2W Output Power into 4О© at 5V
в—Џв—Џ 1.8mA Quiescent Current (VDD = 3.7V)
в—Џв—Џ 92% Efficiency (RL = 8О©, POUT = 1.5W)
в—Џв—Џ 29ВµVRMS Output Noise (AV = 6dB)
в—Џв—Џ Low 0.015% THD+N at 1kHz …
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