¡ Semiconductor

MSM5218

3

¡ Semiconductor

MSM5218

ADPCM Voice Analysis/Synthesis IC

GENERAL DESCRIPTION

The MSM5218 is a complete voice analysis/synthesis IC featuring the Adaptive Differential Pulse

Code Modulation (ADPCM) method of data compression. The MSM5218 contains an analysis stage

where serial PCM data is compressed to 3- or 4-bit parallel ADPCM data. In addition, a synthesis

stage synthesizes PCM data from ADPCM data.

FEATURES

• ADPCM data compatible with OKI's synthesis IC MSM5205

• Analysis/synthesis switching pin provided

• Lower power consumption achieved by one-chip CMOS IC

• Built-in 10-bit D/A converter for analog output

• Variable sampling frequency (4 kHz, 6 kHz, 8 kHz)

• Master clock frequency: 384 kHz

• Package: 24-pin plastic DIP (DIP24-P-600) (Product name: MSM5218RS)

BLOCK DIAGRAM

BIN/TOC

SICK

ADSI

SCON

XT

XT

VCK

RESET

4B/3B

ANA/SYN

DAOUT

MSB/SO

SOCK

12-bit

S•R

f

SI

12

OSC

Timing

Circuit

ADPCM

Analyzer

ADPCM

Synthesizer

10

12

10-bit

DAC

12-bit

S•R

DAS