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參數(shù)資料
| 型號： | T8532 |
| 元件分類： | Codec |
| 英文描述： | T8502 and T8503 Dual PCM Codecs with Filters |
| 中文描述： | T8502和T8503雙的PCM編解碼器與濾波器 |
| 文件頁數(shù)： | 2/48頁 |
| 文件大?。?/td> | 999K |
| 代理商： | T8532 |
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2
Lucent Technologies Inc.
Preliminary Data Sheet
November 2000
Codec Chip Set
T8531/T8532 Multichannel Programmable
Table of Contents
Contents
Page
Features ..................................................................... 1
General Description.................................................... 1
T8532 Description.................................................... 4
T8531 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........... 13
Loopback Modes................................................. 14
Interchip Control Interface................................... 14
T8531 Functional Blocks........................................ 14
Clock Synthesizer................................................ 14
DSP Clock Frequency Selection ......................... 14
T8531 System Interface ..................................... 15
T8531 Microprocessor Interface.......................... 15
T8532 Octal Control Interface............................. 16
T8531 Time-Slot Assignment (TSA).................... 16
DSP Engine Timing................................................ 16
T8531 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
T8531 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
T8531 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
Tone Plant.............................................................. 22
DTMF Transceiver............................................... 22
Caller Line Identification...................................... 22
Call Progress Tones............................................ 22
Absolute Maximum Ratings...................................... 23
Handling Precautions ............................................... 23
Electrical Characteristics .......................................... 24
dc Characteristics .................................................. 24
Transmission Characteristics ................................... 25
Timing Characteristics.............................................. 29
Software Interface .................................................... 32
Applications .............................................................. 42
Common Voltage Reference.................................. 45
Outline Diagrams...................................................... 46
64-Pin MQFP ......................................................... 46
64-Pin TQFP.......................................................... 47
Ordering Information................................................. 48
Appendix A. Transmit Path Group Delay vs. Bit
Offset ................................................................ 48
Figures
Page
Figure 1. System Block Diagram.................................1
Figure 2. Block Diagram of T8532 Octal Converter.....4
Figure 3. Block Diagram of One T8532 Analog
Channel........................................................4
Figure 4. T8531 Block Diagram...................................5
Figure 5. T8531 Digital ac Path...................................6
Figure 6. Control, PCM, and Octal Interfaces..............6
Figure 7. T8532 64-Pin MQFP ....................................7
Figure 8. T8531 64-Pin TQFP .....................................9
Figure 9. Timing Characteristics of PCM Interface
Assuming 2.048 MHz SCK Rate................30
Figure 10. Timing Diagram for Microprocessor
Write/Read to/from the DSP on the
Control Interface.......................................31
Figure 11. Line Card Solution Using the L7585
SLIC .........................................................42
Figure 12. Line Card Solution Using the L9215G
SLIC .........................................................43
Figure 13. Line Card Solution Using the L9310G
SLIC .........................................................44
Figure 14. Common 2.4 V Voltage Reference...........45
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