This specification describes the Bt8110 and Bt8110B multichannel ADPCM processor CMOS integrated circuits that implement Adaptive Differential Pulse-Code Modulation (ADPCM) encoding and decoding. The fixed-rate coding algorithms include those specified in ANSI Standard T1.303-1989. These algorithms are identical to those in ITU-T Recommendations G.726 and G.727. These circuits also implement the variable-rate or embedded codes specified in ANSI Standard T1.310-1991 and ITU-T Recommendation G.727.

A single ADPCM processor integrated circuit can provide 24 or 32 full-duplex channels of ADPCM processing (encoding and decoding). In some applications, two circuits can be combined to provide 48 or 64 full-duplex channels. Both A-law and μ-law PCM translations are provided.

Distinguishing Features

? Bt8110B offers internal ROM

? 24 or 32 full-duplex channel capacity (48 or 64 channels with two processors)

? 2-, 3-, 4- and 5-bit quantization dynamically selectable on a channel-by-channel, frame-by-frame basis

? Transparent channel operation

? Two control modes available: microprocessor and hardware.

? Direct framer interface for both T1 and E1 signal formats

? Supports the optimal RESET function described in the algorithm standards

? Supports even-bit inversion of A-law inputs and outputs (required by ITU-T Recommendations G.726, and G.727)

? Minimum throughput delay

? Pin compatible with Bt8110

? 8 mw per-channel, low-power CMOS

Applicable Standards

? ANSI T1.302-1987

? ANSI T1.303-1989

? ANSI T1.310-1991

? ITU-T G.726, G.727

? ANSI T1.501-1994

? ANSI T1Y1 Technical Reports #3 and #10

Applications

? T1/E1 Transcoders

? T1/E1 Multiplexers

? Personal Communications Systems:

Digital European Cordless Telecommunications (DECT), Personal Access Communications System (PACS)

? Wireless Local Loop

? Voice PairGain

? DCME Systems

? Speech Processing/Recording

? Voice Mail/Packetization

? Voice over ATM/Frame Relay