MSM7580

E2U0031-39-61 ¡ Semiconductor MSM7580 ¡ Semiconductor ITU-T G.721 ADPCM TRANSCODER This version: Jun. 1999 MSM7580 Previous version: Aug. 1998 GENERAL DESCRIPTION The MSM7580 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 consists of two systems with full-duplex voice data channels and a data-through mode. The MSM7580 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 Two Data channels PCM companding Law: A-law/µ -law selectable Synchronized Operation between coder and decoder, and between two channels. 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 : +5 V ± 10%, 2.5 mA/channel Package : 28-pin plastic SOP (SOP28-P-430-1.27-K) (Product name : MSM7580GS-K) 1/1...