ISD4004 series voltage 3V, single playback time of 8-16 minutes, good sound quality for mobile phones and other portable electronic products. Chip using CMOS technology, contains the oscillator, anti-aliasing filter, smoothing filter, audio amplifier, automatic squelch and high-density multi-level flash storage display. Chip design is based on all operations must be controlled by a micro-controller, the operation command through the serial communication interface (SPI or Microwire) into. Chip multi-level direct analog storage technology, the value of each sample directly stored in the flash memory chip, and therefore can be very real, natural reproduction of voice, music, tone and effect sound, solid recording circuit to avoid the general quantization and compression caused by quantization noise and the "metallic sound." Sampling frequency can 4.0,5.3,6.4,8.0 kHz, lower frequency, the longer the recorder, while the sound quality is down, piece of information stored in the flash memory

ISD4004.C

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