T8531 Agere Systems, Inc., T8531 Datasheet - Page 4

• Manufacturer Part Number: T8531
• Description: T8502 and T8503 Dual PCM Codecs with Filters
• Manufacturer: Agere Systems, Inc.

Codec Chip Set
General Description
T8532 Description
The T8532 block diagram is shown in Figure 2. Each of its eight channels consists of an antialias filter, sigma-delta
A/D and D/A converters, reconstruction and smoothing filters, termination impedance synthesis, and selectable
gain. The digital oversampled data is multiplexed onto a serial data port designed to interface with the T8531.
Another serial interface accepts control data from the T8531 for activating the various gain settings, self-test, and
powerdown modes. This chip also contains a precision voltage reference.
* Antialiasing filter.
4
VRTX
VRN
VRP
VTX
DIGITAL LOOPBACK
VRTX[7:0]
VRN[7:0]
VRP[7:0]
VTX[7:0]
V
V
V
V
DDA
SSA
DD
SS
Figure 3. Block Diagram of One T8532 Analog Channel
(continued)
SUM
Figure 2. Block Diagram of T8532 Octal Converter
ANALOG HYBRID
TERMINATION
REFERENCE
GAIN
8-CHANNEL
A
VOLTAGE
A/D D/A
T
&
GAIN
GAIN
AAF*
OVERSAMPLED
INTERFACE
INTERFACE
CONTROL
DATA
RECEIVE
FILTER
A/D
-
V REFERENCES
Lucent Technologies Inc.
RSTB
OSDX[1:0]
OSDR[1:0]
OSCK
OSFS
CDO
CDI
CCS
D/A
D/A
November 2000
1.024 MHz
1.024 MHz
5-3794.b (F)
5-3796.d (F)