TAS5508 datasheet(2/105 Pages) TI

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Contents

TAS5508

8-Channel Digital Audio PWM Processor

SLES091D – FEBRUARY 2004 – REVISED JULY 2009

www.ti.com

Introduction PWM

................................................................................................................ 9

1.1

Features

....................................................................................................................... 9

1.2

Overview

..................................................................................................................... 10

1.3

TAS5508 System Diagrams

.............................................................................................. 12

Description

........................................................................................................................ 15

2.1

Physical Characteristics

................................................................................................... 15

2.1.1

Terminal Assignments

.......................................................................................... 15

2.1.2

Ordering Information

............................................................................................ 15

2.1.3

Terminal Descriptions

........................................................................................... 16

2.2

TAS5508 Functional Description

......................................................................................... 18

2.2.1

Power Supply

.................................................................................................... 18

2.2.2

Clock, PLL, and Serial Data Interface

........................................................................ 18

2.2.2.1

Serial Audio Interface

................................................................................ 18

2.2.3

2C Serial-Control Interface

.................................................................................... 19

2.2.4

Device Control

................................................................................................... 19

2.2.5

Digital Audio Processor (DAP)

................................................................................. 19

2.2.5.1

TAS5508 Audio-Processing Configurations

....................................................... 19

2.2.5.2

TAS5508 Audio Signal-Processing Functions

.................................................... 20

2.3

TAS5508 DAP Architecture

............................................................................................... 21

2.3.1

TAS5508 DAP Architecture Diagrams

........................................................................ 21

2.3.2

2C Coefficient Number Formats

.............................................................................. 24

2.3.2.1

28-Bit 5.23 Number Format

......................................................................... 24

2.3.2.2

48-Bit 25.23 Number Format

........................................................................ 26

2.3.2.3

TAS5508 Audio Processing

......................................................................... 27

2.4

Input Crossbar Mixer

....................................................................................................... 28

2.5

Biquad Filters

............................................................................................................... 28

2.6

Bass and Treble Controls

................................................................................................. 29

2.7

Volume, Automute, and Mute

............................................................................................. 30

2.8

Automute and Mute

........................................................................................................ 30

2.9

Loudness Compensation

.................................................................................................. 31

2.9.1

Loudness Example

.............................................................................................. 32

2.10

Dynamic Range Control (DRC)

........................................................................................... 33

2.10.1

DRC Implementation

............................................................................................ 36

2.10.2

Compression/Expansion Coefficient Computation Engine Parameters

................................. 36

2.10.2.1

Threshold Parameter Computation

............................................................... 37

2.10.2.2

Offset Parameter Computation

.................................................................... 37

2.10.2.3

Slope Parameter Computation

.................................................................... 38

2.11

Output Mixer

................................................................................................................ 38

2.12

PWM

......................................................................................................................... 39

2.12.1

DC Blocking (High-Pass Enable/Disable)

.................................................................... 40

2.12.2

De-Emphasis Filter

.............................................................................................. 40

2.12.3

Power-Supply Volume Control (PSVC)

....................................................................... 40

2.12.4

AM Interference Avoidance

.................................................................................... 41

TAS5508 Controls and Status

.............................................................................................. 43

3.1

2C Status Registers

....................................................................................................... 43

3.1.1

General Status Register (0x01)

................................................................................ 43

3.1.2

Error Status Register (0x02)

................................................................................... 43

3.2

TAS5508 Pin Controls

..................................................................................................... 43

3.2.1

Reset (RESET)

.................................................................................................. 43

3.2.2

Power Down (PDN)

............................................................................................. 45

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