General Description
The multichannel programmable codec chip set is comprised of the T8531A 16-channel line card signal processor and one or two custom T8532 octal A/D and D/A converters. A ROM-coded tone plant, with line-test and self-test utilities, 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
■ Per-channel programmable gain and hybrid balance
■ Programmable termination impedances
■ Programmable µ-law, A-law, or linear PCM output
■ Tone plant:
   — DTMF generator
   — DTMF receiver
   — Caller ID generator
   — Call progress tones generator
■ Test utilities:
   — Automatic gain calibration
   — Tone generation
   — dc generation
   — dc measurement
   — Variance computation
   — Peak detection
■ Analog and digital loopbacks
■ Programmable time-slot assignment with bit offset
■ Low-noise, balanced, receive SLIC interface
■ Few or no SLIC/codec interface components required
■ Sigma-delta converters with dither noise reduction
■ Serial microcontroller control interface
■ Meets or exceeds ITU-T G.711—G.712 and relevant Telcordia Technologies™ requirements
■ Available in 64-pin MQFP and TQFP packages