Texas Instruments TAS5508-5142K7EVM User manual

TAS5508-5142K7EVM User’s GuideEvaluation Module for the TAS5508B Digital Audio PWMProcessor and TAS5142 Digital AmplifierPower Output Stage
User's Guide
June 2006
SLEU071

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Contents
1 Overview ................................................................................................................... 51.1 TAS5508-5142K7EVM Features.................................................................................. 61.2 PCB Key Map ....................................................................................................... 7
2 System Interfaces ...................................................................................................... 92.1 Power Supply (PSU) Interface (J901 and J900) ................................................................ 92.2 PSU Control Interface (J902) .................................................................................... 102.3 Loudspeaker Connectors (J101 …J107) ...................................................................... 102.4 Headphone Connector (J700) ................................................................................... 112.5 Control Interface (J40) ............................................................................................ 112.6 Digital Audio Interface (J60) ..................................................................................... 13
3 Protection ................................................................................................................ 153.1 Short-Circuit Protection and Fault-Reporting Circuitry ....................................................... 153.2 Fault Reporting .................................................................................................... 15
4 Related Documentation From Texas Instruments ......................................................... 174.1 Trademarks ........................................................................................................ 17
Important Notices ............................................................................................................... 18
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List of Figures
1-1 Integrated PurePath Digital™ Amplifier System ......................................................................... 61-2 Physical Structure for TAS5508-5142K7EVM (Rough Outline) ....................................................... 72-1 Recommended Power-Up Sequence ..................................................................................... 92-2 J901 and J900 Pin Numbers ............................................................................................... 92-3 J902 Pin Numbers ......................................................................................................... 102-4 J101 . . . J107 Pin Numbers .............................................................................................. 112-5 J700 Pin Numbers ......................................................................................................... 11
List of Tables
2-1 Recommended Supply Voltages ........................................................................................... 92-2 J901 Pin Description ....................................................................................................... 102-3 J900 Pin Description ....................................................................................................... 102-4 J902 Pin Description ....................................................................................................... 102-5 J101 . . . J107 Pin Description ............................................................................................ 112-6 J700 Pin Description ....................................................................................................... 112-7 J40 Pin Description ........................................................................................................ 112-8 J60 Pin Description ........................................................................................................ 133-1 TAS5142 Warning/Error Signal Decoding .............................................................................. 15
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Chapter 1SLEU071 – June 2006
Overview
The TAS5508-5142K7EVM PurePath Digital™ customer evaluation amplifier moduledemonstrates two audio integrated circuits, TAS5508B and TAS5142, from TexasInstruments (TI).
The TAS5508BPAG is a high-performance 32-bit (24-bit input) multichannel PurePathDigital pulse width modulator (PWM) based on Equibit™ technology, with a fullysymmetrical AD modulation scheme. It accepts an input sample rate from 32 kHz to192 kHz. The device also has digital audio processing (DAP) that provides 48-bit signalprocessing, advanced performance, and a high level of system integration. The devicehas interfaces for headphone output and power supply volume control (PSVC).
The TAS5142DKD is a compact, high-power, digital amplifier power stage designed todrive a 4- Ωloudspeaker up to 100 W/10% THD+N. It contains integrated gate drivers,four matched and electrically isolated enhancement-mode N-channel power DMOStransistors, and protection/fault-reporting circuitry.
The DKD package has a PowerPAD™ on the top side for heat transfer through aheatsink. The heatsink in this design is for evaluation purposes only.
This EVM, together with a TI input-USB board, is a complete 7-channel digital audioamplifier system, which includes digital input (S/PDIF), analog inputs, interface to PC,and DAP features, such as digital volume control, input and output mixers, auto mute,equalization, tone controls, loudness, dynamic range compression, and PSVC output.There are configuration options for stereo line level output, stereo headphone output,and power-stage failure protection.
This 6.1 system is designed for home-theater applications, such as A/V receivers, DVDminicomponent systems, home theater in a box (HTIB), DVD receivers, or plasmadisplay panels (PDPs).
PurePath Digital, Equibit, PowerPAD are trademarks of Texas Instruments.
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1.1 TAS5508-5142K7EVM Features
I2S
Bus
TAS5508-5142K7EVM
MODULE
I2C Bus
Example
TI Input-USB
board
6 Channel
Analog
Input
USB
Interface
Optical
and
Coaxia
lS/PDIF
Input
Control Interface
Power Supply
7 Channel
Speaker Output
2 Channel
Headphone Output
TAS5508-5142K7EVM Features
•7-channel PurePath Digital evaluation module (double-sided plated-through PCB layout)•Stereo channel line output•Stereo headphone output•Self-contained protection system (short circuit and thermal)•Standard I
2
S and I
2
C/control connector for TI input board•Double-sided plated-through PCB layout
Figure 1-1. Integrated PurePath Digital™ Amplifier System
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1.2 PCB Key Map
SPEAKER OUTPUTSSPEAKER OUTPUTS
TAS5508B
OUTPUT STAGE
CHANNEL 1
OUTPUT STAGE
CHANNEL 3
OUTPUT STAGE
CHANNEL 2
OUTPUT STAGE
CHANNEL 4
OUTPUT STAGE
CHANNEL 5
3.3V
Regulator
5V
Regulator
Gate Drive
Regulator
PSU
INTERFACE
(J901)
PSU
CONTROL
(J902)
INPUT SIGNAL
INTERFACE (J60)
CONTROL
INTERFACE (J40)
HEADPHONE
OUTPUT
(J700)
OUTPUT STAGE
CHANNEL 6
OUTPUT STAGE
CHANNEL 7
J101J103J102J104
PSU
INTERFACE
(J900)
J105J106J107
PCB Key Map
Physical structure for the TAS5508-5142K7EVM is illustrated in Figure 1-2 .
Figure 1-2. Physical Structure for TAS5508-5142K7EVM (Rough Outline)
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PCB Key Map
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2.1 Power Supply (PSU) Interface (J901 and J900)
Output stage power supply
RESET
>1ms
System power supply
4
1
2
3
(PCB connector top view)
Chapter 2SLEU071 – June 2006
System Interfaces
This chapter describes the TAS5508-5142K7EVM board in regards to power suppliesand system interfaces.
The TAS5508-5142K7EVM module must be powered from external power supplies. High-end audioperformance requires a stabilized power supply with low ripple voltage and low output impedance.
Note: The length of power-supply cable must be minimized. Increasing length of PSU cable isequal to increasing the distortion for the amplifier at high output levels and lowfrequencies.
Maximum output-stage supply voltage depends of the speaker load resistance. Please check therecommended maximum supply voltage in the TAS5142 data sheet.
Table 2-1. Recommended Supply Voltages
VOLTAGEDESCRIPTION CURRENT RECOMMENDATIONSLIMITATIONS
System power supply 15 V to 20 V 0.3 AOutput-stage power supply 0 V to 32 V 6 A
(1)
(1)
The rated current correspond to 2-channel full scale (80 W each), which most likely is adequate fora standard 8-channel amplifier design.
The recommended TAS5142 power-up sequence is shown in the figure below. For proper TAS5142operation, the RESET signal should be kept low during power up. RESET is pulled low during power upfor 200 ms by the onboard reset generator (U73).
Figure 2-1. Recommended Power-Up Sequence
Figure 2-2. J901 and J900 Pin Numbers
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2.2 PSU Control Interface (J902)
1
2
3
5
4
(PCB connector top view)
2.3 Loudspeaker Connectors (J101 …J107)
PSU Control Interface (J902)
Table 2-2. J901 Pin Description
PIN NO. NET-NAME AT SCHEMATICS DESCRIPTION
1 PVDD Output-stage power supply2 SYSTEM System power supply3 GND Ground4 GND Ground
Table 2-3. J900 Pin Description
PIN NO. NET-NAME AT SCHEMATICS DESCRIPTION
1 PVDD Extra output-stage power supply2 PVDD Extra output-stage power supply3 GND Extra ground4 GND Extra ground
This interface is used for onboard sensing of output supply voltage and for the power supply volumecontrol (PSVC) signal.
Figure 2-3. J902 Pin Numbers
Table 2-4. J902 Pin Description
PIN NO. NET-NAME AT SCHEMATICS DESCRIPTION
1 — Reserved for future use2 PVDD Sense of output power supply3 GND Ground4 RESET System reset (bidirectional)5 PSVC Power supply volume control signal
CAUTION
Both positive and negative speaker outputs are floating and may not beconnected to ground (e.g., through an oscilloscope).
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