OKI Semiconductor
ML2302
Recording and Playback LSI with Built-in 2-Bit ADPCM2 Supported FIFO
FEDL2302DIGEST-05
Issue Date: Dec. 27, 2004
GENERAL DESCRIPTION
The ML2302 is a recording and playback LSI with built-in FIFO memories for buffering. It employs the new 2-bit
ADPCM2 algorithm in addition to conventional 4-bit OKIADPCM and 4-bit OKIADPCM2 algorithms.
The ML2302 operates at 2.7 to 3.6 V and supports a variety of applications.
FEATURES
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Built-in two 1024-bit FIFOs
(buffering time of 32 ms when using 8 kHz sampling frequency and 4-bit ADPCM)
•
Supports five compression algorithms for recording and playback:
2-bit OKIADPCM2; 4/5/6/7-bit OKIADPCM2; 4-bit OKIADPCM; 8/16-bit straight PCM; 8-bit OKI
Nonlinear PCM
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Source oscillation frequency 16.384 MHz
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Sampling frequency (fsam)
4.0 to 12.8 kHz (OKIADPCM2)
4.0 to 25.6 kHz (8-bit straight PCM)
•
Supports 8-bit bus interface.
•
Built-in voice level detection function (VAC)
•
Built-in noise injection function
•
Supports external DAC interface.
•
Built-in volume control circuit
(0 dB to –44 dB: –2 dB step, –44 dB to –80 dB: –4 dB step)
•
Built-in 14-bit A/D converter and 14-bit D/A converter
•
Built-in low pass filter (LPF)
(recording side: analog filter, playback side: digital filter)
•
Built-in speaker amplifier (100 mW, 8Ω)
•
Power supply voltage : +2.7 to +3.6 V
•
Package
: 64-pin plastic TQFP (TQFP64-P-1010-0.50-K) (ML2302TB)
: 71-pin W – CSP
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