General Description

The Multichannel Programmable Codec Chip Set is comprised of the T8531 16-channel line card signal processor and one or two custom T8532 octal A/D and D/A converters. A ROM-coded tone plant is included on the signal processor. Together these devices achieve a highly integrated and highly programmable multichannel voice codec solution.

Software is provided to compute the gain and filter coefficients required to program the codec.

Features

■ Single 5 V power supply operation

■ Per-channel programmable transmit gain

— 25.6 dB range, better than 0.01 dB steps

■ Per-channel programmable receive gain

— 17.8 dB range, better than 0.01 dB steps

■ Per-channel programmable hybrid balance

■ Programmable termination impedances

■ Programmable µ-law, A-law, or linear PCM output

■ DTMF generator

■ DTMF receiver

■ Caller ID generator

■ Call progress tones generator

■ Automatic gain calibration

■ Programmable time-slot assignment with bit offset

■ Low-noise, balanced, receive SLIC interface

■ Few or no SLIC/codec interface components required

■ Analog and digital loopbacks

■ Sigma-delta converters with dither noise reduction

■ Serial microcontroller control interface

■ Available in 64-pin MQFP and TQFP packages