MT9125 Datasheet | MITEL

CMOS MT9125 ® Dual ADPCM Transcoder Preliminary Information Features - Dual channel full duplex transcoder - 32 kbit/s and 24 kbit/s ADPCM coding, - patible to G.721 & and G.723 (1988) and ANSI T1.303-1989 - Low power operation, total 25m W typical - Asynchronous 4.096 MHz master clock operation - Transparent ADPCM bypass capability - Serial interface for both PCM and ADPCM data streams - ST-BUS interface supported - Pin selected µ-law or A-law operation - Pin selected CCITT or sign-magnitude PCM coding - Single 5 volt power supply - Optional reset value (CCITT Table 3/G.721) capability Applications - Pair gain - Voice mail systems - Wireless set base stations ISSUE 3 Ordering Information August 1993 MT9125AE MT9125AP 24 Pin Plastic DIP 28 Pin PLCC -40 to +85°C Description The Dual-channel ADPCM transcoder is a low power, CMOS device capable of two encoder functions and two decoder functions. Two 64 kbit/s PCM channels are pressed into two 32 kbit/s ADPCM channels, and two 32 kbit/s ADPCM channels are expanded into two 64 kbit/s PCM channels. The 32 kbit/s ADPCM transcoding algorithm utilized conforms to CCITT Remendation G.721 and ANSI T1.303-1989. The device also supports a 24 kbit/s (three bit word) algorithm (CCITT/G.723). Switching, on-the-fly, between 32 kbit/s and 24 kbit/s, is possible by toggling the appropriate Mode Select (MS1-MS4) control...