DS2167 Datasheet | Dallas Semiconducotr

FEATURES PIN ASSIGNMENT RST TM0 TM1 A0 A1 A2 A3 A4 A5 SPS MCLK VSS 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 VDD YIN CLKY FSY YOUT CS SDI SCLK XOUT FSX CLKX XIN - Speech pression chip patible with standard ADPCM algorithms: - DS2167 supports “new” T1Y1 remendations (July 1986) and “new” CCITT G.721 remendations - DS2168 supports “old” CCITT G.721 remendations - Dual independent channel architecture - device may be programmed to perform full duplex, 2-channel expansions, or 2-channel pressions - Interconnects directly with µ-law or A-law codec/filter devices 24-Pin DIP (600 MIL) CLKY FSY YOUT CS SDI SCLK XOUT NC TM1 TM0 RST NC VDD YIN NC A0 A1 A2 A3 A4 A5 54 3 2 6 7 8 9 28-Pin PLCC - Serial PCM and control port interfaces minimize “glue logic” in multiple channel applications - On-chip channel counters identify input and output timeslots in TDM-based systems - Unique addressing scheme simplifies device control; 3-wire port shared among 64 devices - Bypass and idle features allow dynamic allocation of channel bandwidth, minimize system power requirements 1 28 27 26 25 24 23 22 21 10 20 11 12 13 14 15 16 17 1819 SPS MCLK VSS NC XIN CLKX FSX - Hardware mode intended for stand-alone use - No host processor required - Ideal for voice mail applications - 28-pin surface-mount package available, designated DS2167Q/DS2168Q DESCRIPTION The DS2167 and DS2168 are dedicated digital signal processor (DSP) CMOS chips optimized for Adaptive Differential Pulse Code Modulation (ADPCM) based pression algorithms. The devices halve the transmission bandwidth of “toll quality” voice from 64K to 32K bits/second and are utilized in PCM-based telephony networks. 022698 1/15 DS2167/DS2168 PRODUCT OVERVIEW The DS2167 and DS2168 contain three major functional blocks: a high performance (10 MIPS) DSP “engine,” two independent PCM data interfaces (“X” and “Y”) which connect directly to serial time division multiplexed (TDM) backplanes and a microcontroller-patib...