MSM7581 Datasheet | OKI Electric

E2U0032-28-82 ¡ Semiconductor MSM7581 ¡ Semiconductor ITU-T G.721 4ch ADPCM TRANSCODER This version: Aug. 1998 MSM7581 Previous version: Nov. 1996 GENERAL DESCRIPTION The MSM7581 is an ADPCM transcoder which is used by the new digital cordless system. It converts 64 kbps voice PCM serial data to 32 kbps ITU-T G.721 ADPCM serial data, and vice versa. This device is consists of four systems with full-duplex voice data channels and a data-through mode. The MSM7581 provides cost effective solutions for digital cordless office telephone systems which are incorporated into PABXs, and for the public base stations which are connected to the Central Office through digital PSTNs. Features - Conforms to ITU-T G.721 - Built-in Full-duplex Transcoder with Four Data Channels - PCM panding Law: A-law/µ -law selectable - Serial PCM Data Transmission Speed: 64 kbps to 2048 kbps - Serial ADPCM Data Transmission Speed: 32 kbps to 2048 kbps - Hardware Reset - ITU-T G.721 Optional Reset - for each channel - Power Down Control for each channel - Decoder (ADPCM Æ PCM ) Mute Mode and PAD Mode for each channel - ADPCM Data-through Mode - Capable of time slot conversion - Special ADPCM Input Data Code (”0000”) Detector for each channel - Master Clock Signal : Not necessary - Power supply voltage/Consumption current : +2.7 V to +5.5 V, 2 m A/channel (max) - Package : 100-pin plastic TQFP (TQFP100-P-1414-0.50-K) (Product name : MSM7581TS-K) 1/18 ¡ Semiconductor BLOCK DIAGRAM VDD PAD11 PAD10 SYXP1 BCKP1 SIP1 SOP1 SYRP1 RES1 PAD21 PAD20 SYXP2 BCKP2 SIP2 SOP2 SYRP2 RES2 PAD31 PAD30 SYXP3 BCKP3 SIP3 SOP3 SYRP3 RES3 PAD41 PAD40 SYXP4 BCKP4 SIP4 SOP4 SYRP4 RES4 CODER S→P DECODER S←P PAD/ MUTE CODER S→P DECODER S←P PAD/ MUTE CODER S→P DECODER S←P PAD/ MUTE CODER S→P DECODER S←P PAD/ MUTE +2.7 V to 5.5 V GND LAW 0V PLL MCK CODER DECODER "0000" DETECT CODER P→S DECODER P←S PLCKEN THR1 PLCK1 SYXA1 BCKA1 SOA1 SIA1 DET1 SYRA1 PDN1 THR2 PLCK2 SYXA2 BCKA2 CODER P→S "0000" DETECT DECODER...