Preliminary Data Sheet
November 2000
T8531/T8532 Multichannel Programmable
Codec Chip Set
Features
s
s
s
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
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
VTX (8)
VRTX (8)
VRP (8)
VRN (8)
T8532
OCTAL
A/D
D/A
2
3
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
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 pro-
grammable multichannel voice codec solution.
Software is provided to compute the gain and filter
coefficients required to program the codec.
PCM
INTERFACE
VTX (8)
VRTX (8)
VRP (8)
VRN (8)
T8532
OCTAL
A/D
D/A
2
3
T8531
DIGITAL
SIGNAL
PROCESSOR
ASIC
CK16
MICROPROCESSOR
INTERFACE
5-3793F (F)
Figure 1. System Block Diagram
AGERE [ AGERE SYSTEMS ]
