The ML2253x series is 4 channels mixing speech synthesis LSIs for automotive-grade with built-in serial audio interface, available in flash memory and external memory types.Features include HQ-ADPCM, 16bit D/A converter, and low-pass filter for achieving high sound quality, along with an integrated 1.0W monaural speaker amp that enables direct speaker drive.A failure detection function is also built in capable of detecting malfunctions.All functions necessary for audio output are integrated on a single chip, making it possible to easily add voice functionality by simply adding this LSI.