參數(shù)資料
型號： T8531A
元件分類： Codec
英文描述： T8531A/8532 Multichannel Programmable Codec Chip Set
中文描述： T8531A/8532多通道可編程解碼器芯片組
文件頁數(shù)： 2/50頁
文件大小： 888K
代理商： T8531A
2
Agere Systems Inc.
Preliminary Data Sheet
September 2001
Codec Chip Set
T8531A/T8532 Multichannel Programmable
Table of Contents
Contents
Page
Features ..................................................................... 1
General Description.................................................... 1
T8532 Description.................................................... 4
T8531A Description ................................................. 5
Pin Information ........................................................... 7
Chip Set Functional Description............................... 12
Transmit Path......................................................... 12
Antialias Filter and
Σ
-
Converter ...................... 12
Decimator ........................................................... 12
Digital Transmit Gain Adjustment........................ 12
Band Filtering...................................................... 12
μ
-Law, A-Law, and Linear PCM Modes............... 12
Receive Path ......................................................... 13
Receive Path Filtering......................................... 13
Digital Receive Gain............................................ 13
Interpolator and Digital Sigma-Delta
Modulator.......................................................... 13
Decoder, Filters, and Receive Amplifier ............. 13
Other Chip Set Functions....................................... 13
Voltage Reference............................................... 13
Hybrid Balance.................................................... 13
Analog Termination Impedance Synthesis.......... 13
Digital Termination Impedance Synthesis........... 14
Loopback Modes................................................. 14
Interchip Control Interface................................... 14
T8531A Functional Blocks..................................... 14
Clock Synthesizer................................................ 14
T8531A System Interface ................................... 15
T8531A Microprocessor Interface....................... 15
T8532 Octal Control Interface............................. 16
T8531A Time-Slot Assignment (TSA)................. 16
DSP Engine Timing................................................ 16
T8531A Program Structure ................................. 16
Control of the DSP Engine via the
Microprocessor Interface.................................. 17
The DSP Engine Time-Slot Information
Tables............................................................... 17
The DSP Engine ac Path Coefficient Table ........ 17
The Time-Slot Control Word................................ 18
Operations Performed by the DSP Engine at
T8531A Start-Up............................................... 18
Microprocessor Start-Up of the DSP Engine....... 19
Powering Up a Time Slot in the T8531................ 19
Disabling a Time Slot in the T8531 ..................... 19
T8532 Powerup/Powerdown............................... 19
Changing DSP RAM Space of an Active
Time Slot........................................................... 20
DSP Engine Memory Requirements ................... 20
Contents
Page
T8531A Reset and Start-Up................................... 20
Hardware Reset .................................................. 20
Internal Reset...................................................... 21
Reset of the T8532 Devices................................ 21
Start-Up After Internal Reset.................................. 21
Autocalibration..................................................... 22
User Test Features ................................................ 22
Off-Line Programmable System Test
Capability.......................................................... 22
On-Line Per-Channel Test Capability.................. 22
Inactive Mode with Loopback.............................. 22
Self-Test and Line-Test Routines .......................... 22
Tone Generation ................................................. 22
Tone Detection.................................................... 23
dc Generation...................................................... 23
dc Measurement.................................................. 23
Variance Computation......................................... 23
Peak Detection.................................................... 23
Tone Plant.............................................................. 23
DTMF Transceiver............................................... 23
Caller Line Identification...................................... 23
Call Progress Tones............................................ 23
Absolute Maximum Ratings...................................... 24
Handling Precautions ............................................... 24
Electrical Characteristics .......................................... 25
dc Characteristics .................................................. 25
Transmission Characteristics ................................... 26
Timing Characteristics.............................................. 30
Software Interface .................................................... 33
Applications .............................................................. 44
Common Voltage Reference.................................. 47
Outline Diagrams...................................................... 48
64-Pin MQFP ......................................................... 48
64-Pin TQFP.......................................................... 49
Ordering Information................................................. 50
Appendix A. Transmit Path Group Delay vs. Bit
Offset ................................................................ 50
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參數(shù)描述
T8532 制造商:AGERE 制造商全稱:AGERE 功能描述:T8531A/8532 Multichannel Programmable Codec Chip Set
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