EVALUATION KIT AVAILABLE MAX98357A/
MAX98357B PCM Input Class D Audio Power Amplifiers General Description The MAX98357A/MAX98357B are digital pulse-code modulation (PCM) input Class D power amplifiers that provide
Class AB audio performance with Class D efficiency. These
ICs offer five selectable gain settings (3dB, 6dB, 9dB,
12dB, and 15dB) in I2S/left-justified mode set by a single
gain select input and a fixed 12dB gain in TDM mode.
The digital audio interface is highly flexible with the
MAX98357A supporting I2S data and the MAX98357B
supporting left-justified data. Both ICs support 8 channel
time division multiplexed (TDM) data. The digital audio
interface accepts specified sample rates between 8kHz
and 96kHz for all supported data formats. The ICs can
be configured to produce a left channel, right channel, or
(left/2 + right/2) output from the stereo input data. The ICs
operate using 16/24/32-bit data for I2S and left-justified
modes as well as 16-bit or 32-bit data using TDM mode.
The ICs eliminate the need for the external MCLK signal
that is typically used for PCM communication. This reduces EMI and possible board coupling issues in addition to
reducing the size and pin count of the ICs.
The ICs also feature a very high wideband jitter tolerance (12ns typ) on BCLK and LRCLK to provide robust
operation.
Active emissions-limiting, edge-rate limiting, and overshoot control circuitry greatly reduce EMI. A filterless
spread-spectrum modulation scheme eliminates the need …