TAS5508C datasheet(2/107 Pages) TI

2 / 107 page

TAS5508C

SLES257 – SEPTEMBER 2010

www.ti.com

Contents

Introduction PWM

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

1.1

Features

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

1.2

Overview

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

1.3

TAS5508C 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

PIN Descriptions

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

2.2

TAS5508C Functional Description

...................................................................................... 17

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

TAS5508C Audio-Processing Configurations

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

2.2.5.2

TAS5508C Audio Signal-Processing Functions

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

2.3

TAS5508C DAP Architecture

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

2.3.1

TAS5508C 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

TAS5508C 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

TAS5508C Controls and Status

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

3.1

2C Status Registers

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

3.1.1

General Status Register (0x01)

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

Contents

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