Contents
TAS5508
8-Channel Digital Audio PWM Processor
SLES091D – FEBRUARY 2004 – REVISED JULY 2009
www.ti.com
1
Introduction PWM
................................................................................................................ 9 1.1
Features
.......................................................................................................................
91.2
Overview
.....................................................................................................................
101.3
TAS5508 System Diagrams
..............................................................................................
122
Description
........................................................................................................................ 15 2.1
Physical Characteristics
...................................................................................................
152.1.1
Terminal Assignments
..........................................................................................
152.1.2
Ordering Information
............................................................................................
152.1.3
Terminal Descriptions
...........................................................................................
162.2
TAS5508 Functional Description
.........................................................................................
182.2.1
Power Supply
....................................................................................................
182.2.2
Clock, PLL, and Serial Data Interface
........................................................................
182.2.2.1
Serial Audio Interface
................................................................................
182.2.3
I
2C Serial-Control Interface
....................................................................................
192.2.4
Device Control
...................................................................................................
192.2.5
Digital Audio Processor (DAP)
.................................................................................
192.2.5.1
TAS5508 Audio-Processing Configurations
.......................................................
192.2.5.2
TAS5508 Audio Signal-Processing Functions
....................................................
202.3
TAS5508 DAP Architecture
...............................................................................................
212.3.1
TAS5508 DAP Architecture Diagrams
........................................................................
212.3.2
I
2C Coefficient Number Formats
..............................................................................
242.3.2.1
28-Bit 5.23 Number Format
.........................................................................
242.3.2.2
48-Bit 25.23 Number Format
........................................................................
262.3.2.3
TAS5508 Audio Processing
.........................................................................
272.4
Input Crossbar Mixer
.......................................................................................................
282.5
Biquad Filters
...............................................................................................................
282.6
Bass and Treble Controls
.................................................................................................
292.7
Volume, Automute, and Mute
.............................................................................................
302.8
Automute and Mute
........................................................................................................
302.9
Loudness Compensation
..................................................................................................
312.9.1
Loudness Example
..............................................................................................
322.10
Dynamic Range Control (DRC)
...........................................................................................
332.10.1
DRC Implementation
............................................................................................
362.10.2
Compression/Expansion Coefficient Computation Engine Parameters
.................................
362.10.2.1
Threshold Parameter Computation
...............................................................
372.10.2.2
Offset Parameter Computation
....................................................................
372.10.2.3
Slope Parameter Computation
....................................................................
382.11
Output Mixer
................................................................................................................
382.12
PWM
.........................................................................................................................
392.12.1
DC Blocking (High-Pass Enable/Disable)
....................................................................
402.12.2
De-Emphasis Filter
..............................................................................................
402.12.3
Power-Supply Volume Control (PSVC)
.......................................................................
402.12.4
AM Interference Avoidance
....................................................................................
413
TAS5508 Controls and Status
.............................................................................................. 43 3.1
I
2C Status Registers
.......................................................................................................
433.1.1
General Status Register (0x01)
................................................................................
433.1.2
Error Status Register (0x02)
...................................................................................
433.2
TAS5508 Pin Controls
.....................................................................................................
433.2.1
Reset (RESET)
..................................................................................................
433.2.2
Power Down (PDN)
.............................................................................................
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