Texas Instruments PurePath Digital TAS5342DDV6EVM Manuale utente

User's Guide

SLAU239A–February 2008–Revised September 2015

TAS5342DDV6EVM

This user’s guide describes the operation of the evaluation module for the TAS5342 Digital Amplifier

Power Output Stage using the TAS5508B Digital Audio PWM Processor from Texas Instruments. The

user’s guide also provides measurement data and design information like schematic, bill of materials, and

PCB layout.

Contents

1 Overview...................................................................................................................... 3

1.1 TAS5342DDV6EVM Features..................................................................................... 4

1.2 PCB Key Map ....................................................................................................... 5

2 Quick Setup Guide........................................................................................................... 6

2.1 Electrostatic Discharge Warning.................................................................................. 6

2.2 Unpacking the EVM ................................................................................................ 7

2.3 Power Supply Setup................................................................................................ 7

2.4 Speaker Connection................................................................................................ 7

2.5 GUI Software Installation .......................................................................................... 8

3 Protection ..................................................................................................................... 8

3.1 Short-Circuit Protection and Fault-Reporting Circuitry......................................................... 8

3.2 Fault Reporting...................................................................................................... 8

4 TAS5342DDV6EVM Performance......................................................................................... 9

4.1 THD+N vs Power (BTL –4 Ω)................................................................................... 11

4.2 THD+N vs Power (BTL –6 Ω)................................................................................... 11

4.3 THD+N vs Power (BTL –8 Ω)................................................................................... 12

4.4 THD+N vs Power (PBTL –2 Ω).................................................................................. 12

4.5 THD+N vs Power (PBTL –3 Ω).................................................................................. 13

4.6 THD+N vs Frequency (BTL –4 Ω).............................................................................. 14

4.7 THD+N vs Frequency (BTL – 6 Ω).............................................................................. 14

4.8 THD+N vs Frequency (BTL –8 Ω).............................................................................. 15

4.9 THD+N vs Frequency (PBTL –2 Ω)............................................................................. 15

4.10 THD+N vs Frequency (PBTL –3 Ω)............................................................................. 16

4.11 FFT Spectrum with –60-dBFS Tone (BTL) .................................................................... 16

4.12 FFT Spectrum With –60-dBFS Tone (PBTL).................................................................. 16

4.13 Idle Noise FFT Spectrum (BTL)................................................................................. 17

4.14 Idle Noise FFT Spectrum (PBTL) ............................................................................... 17

4.15 Channel Separation............................................................................................... 18

4.16 Frequency Response (BTL)...................................................................................... 19

4.17 Frequency Response (PBTL).................................................................................... 19

4.18 High-Current Protection (BTL)................................................................................... 19

4.19 High-Current Protection (PBTL)................................................................................. 20

4.20 Pop/Click (BTL).................................................................................................... 21

4.21 Pop/Click (PBTL).................................................................................................. 21

4.22 Output Stage Efficiency .......................................................................................... 22

4.23 Subwoofer Lineout THD vs Output Voltage ................................................................... 22

4.24 Subwoofer Lineout THD vs Frequency......................................................................... 23

4.25 Subwoofer Lineout Frequency Response...................................................................... 23

5 Related Documentation from Texas Instruments ...................................................................... 24

PurePath Digital, Equibit are trademarks of Texas Instruments.

Microsoft, Windows are registered trademarks of Microsoft Corporation.

SLAU239A–February 2008–Revised September 2015 TAS5342DDV6EVM

www.ti.com

5.1 Additional Documentation........................................................................................ 24

Appendix A Design Documents................................................................................................ 25

List of Figures

1 Integrated PurePath Digital™ Amplifier System......................................................................... 5

2 Physical Structure for the TAS5342DDV6EVM (Approximate Layout) ............................................... 6

3 TAS5508 GUI Window...................................................................................................... 8

4 THD+N vs Power (BTL – 4 Ω)............................................................................................ 11

5 THD+N vs Power (BTL –6 Ω)............................................................................................ 12

6 THD+N vs Power (BTL –8 Ω)............................................................................................ 12

7 THD+N vs Power (PBTL –2 Ω)........................................................................................... 13

8 THD+N vs Power (PBTL –3 Ω)........................................................................................... 13

9 THD+N vs Frequency (BTL –4 Ω)....................................................................................... 14

10 THD+N vs Frequency (BTL – 6 Ω)....................................................................................... 14

11 THD+N vs Frequency (BTL –8 Ω)....................................................................................... 15

12 THD+N vs Frequency (PBTL –2 Ω)...................................................................................... 15

13 THD+N vs Frequency (PBTL –3 Ω)...................................................................................... 16

14 FFT Spectrum with –60-dBFS Tone (BTL) ............................................................................. 16

15 FFT Spectrum with –60-dBFS Tone (PBTL)............................................................................ 17

16 Idle Noise FFT Spectrum (BTL).......................................................................................... 17

17 Idle Noise FFT Spectrum (PBTL) ........................................................................................ 18

18 Channel Separation........................................................................................................ 18

19 Frequency Response (BTL)............................................................................................... 19

20 Frequency Response (PBTL)............................................................................................. 19

21 High-Current Protection (BTL)............................................................................................ 20

22 High-Current Protection (PBTL).......................................................................................... 20

23 Pop/Click (BTL)............................................................................................................. 21

24 Pop/Click (PBTL)........................................................................................................... 21

25 Output Stage Efficiency ................................................................................................... 22

26 Subwoofer Lineout THD vs Output Voltage ............................................................................ 22

27 Subwoofer Lineout THD vs Frequency.................................................................................. 23

28 Subwoofer Lineout Frequency Response............................................................................... 23

List of Tables

1 TAS5342DDV6EVM Specification......................................................................................... 3

2 Recommended Supply Voltages for Power Stage ...................................................................... 7

3 Supply Adapter for System Power, Logic and Gate Driver Characteristics.......................................... 7

4 TAS5342 Warning/Error Signal Decoding................................................................................ 9

5 General Test Conditions.................................................................................................... 9

6 TAS5508B Register Settings............................................................................................... 9

7 Electrical Data................................................................................................................ 9

8 Audio Performance......................................................................................................... 10

9 Audio Performance Subwoofer Line Output ............................................................................ 10

10 Thermal Specification...................................................................................................... 10

11 Physical Specifications .................................................................................................... 11

12 Related Documentation from Texas Instruments ...................................................................... 24

2TAS5342DDV6EVM SLAU239A–February 2008–Revised September 2015

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Overview

1 Overview

The TAS5342DDV6EVM PurePath Digital™ customer evaluation module demonstrates the integrated

circuits TAS5342DDV and TAS5508BPAG from Texas Instruments (TI).

The TAS5342DDV is a high-performance, integrated stereo Digital Amplifier Power Stage designed to

drive 4-Ωspeakers at up to 100 W per channel. The device incorporates TI Equibit™ technology and is

designed to be used with TI Equibit™ modulators. This system requires only a simple passive

demodulation filter to deliver high-quality, high-efficiency audio amplification.

The TAS5508BPAG is a high-performance, 32-bit (24-bit input) multichannel PurePath Digital™ pulse

width modulator (PWM) based on Equibit™ technology with fully symmetrical AD modulation scheme. The

device also has digital audio processing (DAP) that provides 48-bit signal processing, advanced

performance, and a high level of system integration. The device has interfaces for headphone output and

power supply volume control (PSVC).

This EVM is configured with four BTL channels, one PBTL (parallel BTL) channel for the center channel,

and a subwoofer lineout using the DRV600 line driver.

The DRV600RTJ is a stereo line driver designed to allow the removal of the DC-blocking capacitors for

reduced component count and cost. The DRV600RTJ is ideal for single-supply electronics where size and

cost are critical design parameters. The DRV600RTJ is capable of driving two VRMS into a 600-Ωload

with a 3.3-V supply. The DRV600RTJ has a fixed gain of –1.5 V/V. Independent shutdown control for the

left and right audio channels is implemented.

This EVM, together with a TI input-USB board, is a complete 5-channel + subwoofer line-output digital

audio amplifier system which includes digital input (S/PDIF), analog inputs, interface to a personal

computer (PC), and DAP features like digital volume control, input and output mixers, automute, tone

controls, loudness, EQ filters, and dynamic range compression (DRC). Configuration options are available

for power stage failure protection.

Table 1. TAS5342DDV6EVM Specification

Key Parameters

Output stage supply voltage 0 V – 31.5 V

Number of channels 4 × BTL, 1 x PBTL

Load impedance BTL 4–8 Ω

Load impedance PBTL 2–8 Ω

Output power BTL 120 W / 4 Ω10% THD or 87 W / 6 Ω/ 10% THD

Output power PBTL 225 W / 2 Ω/ 10% THD

DNR >102 dB

PWM processor TAS5508BPAG

Output stage TAS5342DDV

Other features Subwoofer line output

This 5-channel system plus subwoofer line output is designed for home theater applications such as A/V

receivers, DVD receivers, DVD mini-component systems, or home theater in a box (HTIB).

This document covers EVM specifications, audio performance and power efficiency measurements

graphs, and design documentation that includes schematics, parts list, layout, and mechanical design.

SLAU239A–February 2008–Revised September 2015 TAS5342DDV6EVM

Overview

www.ti.com

Gerber (layout) files are available at www.ti.com.

The EVM is delivered with cables and an Input-USB board to connect to an input source and be controlled

from a PC.

An external power adapter is required for supplying the voltage to the Input USB-2 Control Board. Refer to

the Power Supply Setup section for more information.

1.1 TAS5342DDV6EVM Features

• 5/6-channel PurePath Digital™ evaluation module

• Subwoofer line output (LFE Output).

• Self-contained protection system (short circuit and thermal).

• Standard I2S and I2C/control connector for TI input board

• Double-sided, plated-through PCB layout.

4TAS5342DDV6EVM SLAU239A–February 2008–Revised September 2015

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I2S

Bus

I2C Bus

Example

TI Input- USB

board

8 Channel

Analog

Input

USB

Interface

Optical

and

Coaxia

S/P DIF

Input

Control Interface

Power Supply

5/6 Channel

Speaker Output

Subwoofer Line Out

TAS5342DDV6EVM

MODULE

www.ti.com

Overview

Figure 1. Integrated PurePath Digital™ Amplifier System

1.2 PCB Key Map

Physical structure for the TAS5342DDV6EVM is illustrated in Figure 2.

SLAU239A–February 2008–Revised September 2015 TAS5342DDV6EVM

SPEAKER OUTPUTS

TAS5508b

OUTPUT STAGE

CHANNEL 3

3.3V

Regulator

PSU

INTERFACE

(J901)

PSU

CONTROL

(J902)

INPUT SIGNAL & CONTROL

INTERFACE (J10)

SUBWOOFER

OUTPUT

(J600)

J101

BTL

J102

BTL

OUTPUT STAGE

CHANNEL 1

OUTPUT STAGE

CHANNEL 4

OUTPUT STAGE

CHANNEL 2

OUTPUT STAGE

CHANNEL 6

OUTPUT STAGE

CHANNEL 5

SPEAKER OUTPUTS

J103

BTL

J104

BTL

SPEAKER OUTPUTS

J117

PBTL

J107

BTL*

DRV600

J108

BTL*

*: Config Option

Quick Setup Guide

www.ti.com

Figure 2. Physical Structure for the TAS5342DDV6EVM (Approximate Layout)

2 Quick Setup Guide

This section describes the TAS5342DDV6EVM board in regards to power supplies and system interfaces.

Included is information regarding handling and unpacking, absolute operating conditions, and a description

of the factory default switch and jumper configuration. A step-by-step guide explains how to configure the

TAS5342DDV6EVM for device evaluation.

2.1 Electrostatic Discharge Warning

Many of the components on the TAS5342DDV6EVM are susceptible to damage by electrostatic discharge

(ESD). Customers are advised to observe proper ESD handling precautions when unpacking and handling

the EVM, including the use of a grounded wrist strap at an approved ESD workstation.

CAUTION

Failure to observe ESD handling procedures may result in damage to EVM

components.

6TAS5342DDV6EVM SLAU239A–February 2008–Revised September 2015

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Quick Setup Guide

2.2 Unpacking the EVM

On opening the TAS5342DDV6EVM package, ensure that the following items are included:

• 1 pc. TAS5342DDV6EVM board using one TAS5508BPAG and three TAS5342DDV.

• 1 pc. TI Input USB Board 2 for interfacing TAS5342DDV6EVM with S/PDIF/analog sources and PC for

control.

• 1 pc. Signal and Control Interface IDC cable for connection to a TI Input USB Board 2.

• 1 pc. Cable for connecting Input-USB board to a USB port on a PC for TAS5508B control by software.

• 1 pc. Power supply cable for a regulated power supply (H-bridge supply).

If any of the items are missing, contact the Texas Instruments Product Information Center nearest you to

inquire about a replacement.

Connect Input-USB board to TAS5342DDV6EVM using the delivered IDC cable.

2.3 Power Supply Setup

To power up the EVM, two power supplies are needed. One for system power, logic, and gate-drive, and

one for output stage supply. The H-bridge power supply is connected to the EVM using the delivered

power cable White/Black, White/Black. The system, logic and gate drive power supply must be supplied

from an external 15-V, 1-A adapter. The characteristics of this adapter can be found in Table 3.

Table 2. Recommended Supply Voltages for Power Stage

Description Voltage Limitations Current Requirement Cable

Output stage power supply 0 – 31.5 V 10 A White/Black

Table 3. Supply Adapter for System Power, Logic and Gate Driver Characteristics

Description Requirement

DC Output Voltage 15 V

Output Current 1 A

Max Power Rating 15 W

DC Output Connector 5.5 mm x 2.1 mm x 10 mm center positive barrel plug

CAUTION

Applying voltages above the limitations given in Table 2 may cause permanent

damage to your hardware.

NOTE: The length of the power supply cable must be minimized. Increasing the length of the PSU

cable is equal to increasing the distortion for the amplifier at high output levels and low

frequencies.

2.4 Speaker Connection

CAUTION

Both positive and negative speaker outputs are floating and may not be

connected to ground (e.g., through an oscilloscope).

SLAU239A–February 2008–Revised September 2015 TAS5342DDV6EVM

Quick Setup Guide

www.ti.com

2.5 GUI Software Installation

The TAS5508 GUI provides easy control of all registers in TAS5508B. The latest TAS5508 GUI can be

downloaded from the TAS5342DDV6EVM product folder on www.ti.com.

To install the software, run the setup file of the GUI.

After installation, turn on power supplies and connect USB cable to Input-USB board.

Start the GUI program from Microsoft®Windows®menu. Start up of the GUI takes a few seconds.

Figure 3. TAS5508 GUI Window

For more advanced use of the GUI, see the GUI User’s Guide and data manual for TAS5508B

(SLES162).

3 Protection

This section describes the short-circuit protection and fault-reporting circuitry of the TAS5342 device.

3.1 Short-Circuit Protection and Fault-Reporting Circuitry

The TAS5342 is a self-protecting device that provides fault reporting (including high-temperature

protection and short-circuit protection). The TAS5342 is configured in back-end auto-recovery mode and

therefore resets automatically after all errors (M1, M2, and M3 is set low); see the data sheet (SLAS557)

for further explanation. This mean that the device restart itself after an error occasion and reports shortly

thereafter through the SD error signal.

3.2 Fault Reporting

The OTW and SD outputs from TAS5342 indicate fault conditions. See the TAS5342 data manual for a

description of these pins.

8TAS5342DDV6EVM SLAU239A–February 2008–Revised September 2015

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TAS5342DDV6EVM Performance

Table 4. TAS5342 Warning/Error Signal Decoding

OTW SD Device Condition

0 0 High-temperature error and/or high-current error

0 1 High-temperature warning

1 0 Undervoltage lockout or high-current error

1 1 Normal operation, no errors/warnings

The temperature warning signals at the TAS5342DDV6EVM board are wired-OR to one temperature

warning signal (OTW – pin 22 in the control interface connector). Shutdown signals are wired-OR into one

shutdown signal (SD – pin 20 in the control interface connector).

The shutdown signals together with the temperature warning signal give chip-state information as

described in the Table 4. device fault-reporting outputs are open-drain outputs.

4 TAS5342DDV6EVM Performance

Table 5. General Test Conditions

General Test Conditions Notes

Output stage supply voltage: 31.5 V Laboratory power supply (EA-PS 7065-10A)

Load impedance BTL: 4–8 Ω

Load impedance PBTL: 2–4 Ω

Input signal 1 kHz sine

Sampling frequency 48 kHz

Gain setting in TAS5508B 0 dB

Measurement filter AES17 and AUX0025

TI input board Input-USB2 Rev 1

EVM configuration file Ver 1.00 TAS5342DDV6EVM Configuration (1.00).cfg

Note: These test conditions are used for all tests, unless otherwise specified.

Table 6. TAS5508B Register Settings

Modulation Index Limit 0x16 0x02 Set modulation index to 97.7%

Master Volume 0xD9 00 00 00 48 Master volume set to 0 dB

Note: These register settings are used for all test, unless otherwise specified.

Table 7. Electrical Data

Electrical Data Notes/Conditions

Output power, BTL, 4 Ω: 90 W 1 kHz, unclipped (0 dBFS), TA= 25°C

Output power, BTL, 4 Ω: 120 W 1 kHz, 10% THD+N, TA= 25°C

Output power, BTL, 6 Ω: 66 W 1 kHz, unclipped (0 dBFS), TA= 25°C

Output power, BTL, 6 Ω: 87 W 1 kHz, 10% THD+N, TA= 25°C

Output power, BTL, 8 Ω: 51 W 1 kHz, unclipped (0 dBFS), TA= 25°C

Output power, BTL, 8 Ω: 68 W 1 kHz, 10% THD+N, TA= 25°C

Output power, PBTL, 2 Ω: 170 W 1 kHz, unclipped (0 dBFS), TA= 25°C

Output power, PBTL, 2 Ω: 225 W 1 kHz, 10% THD+N, TA= 25°C

Output power, PBTL, 3 Ω: 130 W 1 kHz, unclipped (0 dBFS), TA= 25°C

Output power, PBTL, 3 Ω: 170 W 1 kHz, 10% THD+N, TA= 25°C

Maximum peak current, BTL: >10 A 1-kHz burst, 1 Ω, ROC = 27 kΩ

Maximum peak current, PBTL: >20 A 1-kHz burst, 1 Ω, ROC = 27 kΩ

Output stage efficiency: 90% 2 x channels, 8 Ω

Damping factor BTL: 8.5 1 kHz, relative to 4-Ωload

SLAU239A–February 2008–Revised September 2015 TAS5342DDV6EVM

TAS5342DDV6EVM Performance

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Table 7. Electrical Data (continued)

Electrical Data Notes/Conditions

Damping factor PBTL: 9.4 1 kHz, relative to 2-Ωload

H-bridge supply current: <190 mA 1 kHz, -60-dBFS signal

Idle power consumption: 5.99 W H-bridge supply, –60-dBFS input signal

Table 8. Audio Performance

Audio Performance Notes/Conditions

THD+N, BTL, 4 Ω: 1 W <0.06 % 1 kHz

THD+N, BTL, 4 Ω: 10 W <0.15 % 1 kHz

THD+N, BTL, 4 Ω: 50 W <0.095 % 1 kHz

THD+N, BTL, 6 Ω: 1 W <0.08 % 1 kHz

THD+N, BTL, 6 Ω: 10 W <0.097 % 1 kHz

THD+N, BTL, 6 Ω: 50 W <0.08 % 1 kHz

THD+N, BTL, 8 Ω: 1 W <0.073 % 1 kHz

THD+N, BTL, 8 Ω: 10 W <0.085 % 1 kHz

THD+N, BTL, 8 Ω: 50 W <0.068 % 1 kHz

THD+N, PBTL, 2 Ω: 1 W <0.089 % 1 kHz

THD+N, PBTL, 2 Ω: 10 W <0.15 % 1 kHz

THD+N, PBTL, 2 Ω: 50 W <0.13 % 1 kHz

THD+N, PBTL, 2 Ω: 100 W <0.097 % 1 kHz

THD+N, PBTL, 2 Ω: 150 W <0.21 % 1 kHz

THD+N, PBTL, 3 Ω: 1 W <0.093 % 1 kHz

THD+N, PBTL, 3 Ω: 10 W <0.05 % 1 kHz

THD+N, PBTL, 3 Ω: 50 W <0.08 % 1 kHz

THD+N, PBTL, 3 Ω: 100 W <0.062 % 1 kHz

Dynamic Range: >102 dB Ref: rated power, A-weighted, AES17 filter, 4 ch avg

Noise Voltage: <160 μVrms A-weighted, AES17 filter

Click/Pop, DC step BTL: 14 mV Mute/unmute, no signal, 6 Ω

Click/Pop, DC step PBTL: 27 mV Mute/unmute, no signal, 4 Ω

Channel Separation: >61 dB 1 kHz,

Frequency Response: 0.0 / –0.8 dB 90 W / 4 Ω, unclipped (0 dBFS)

Table 9. Audio Performance Subwoofer Line Output

Audio Performance Notes/Conditions

Full-scale output voltage swing, 0 dBFS: 2 VRMS 100 Hz, 10-kΩload

Full-scale output voltage swing, 10% 2.32 VRMS 100 Hz, 10-kΩload

THD+N:

THD+N, 10 kΩ: 1 V <0.017% 100 Hz

THD+N, 10 kΩ: 100 mV <0.013% 100 Hz

Frequency response: +1, –3 dB 20 Hz–1.7 kHz

Dynamic range: >105.5 dB 20 Hz–1.7 kHz

Noise voltage: <11 μV 20 Hz–1.7 kHz

Table 10. Thermal Specification

Thermal Specification** THEATSINK* Notes/Conditions

Idle, all channels switching 32°C 1 kHz, 15 min, –60 dBFS signal, TA= 25°C

4x12.5 W, 4 Ω+ 1x25 W , 2 Ω(1/8 power) 58°C 1 kHz, 1 hour, TA= 25°C

2x100 W, 4 Ω78°C 1 kHz, 5 min, TA= 25°C

*Measured on surface of heatsink

10 TAS5342DDV6EVM SLAU239A–February 2008–Revised September 2015

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