Texas Instruments TAS5721EVM Manual de usuario

User's Guide

SLOU346–July 2012

TAS5721-TAS5723EVM Evaluation Module

This manual describes the operation of the TAS5721-TAS5723EVM (EVM) for evaluation of the

performance of the TAS5721 and TAS5723 digital input class-D power amplifiers with PWM outputs. The

EVM is designed for operation with the Input-USB Board3. The main contents of this document are:

• Details on the proper connection of this EVM and details about the EVM

• Details on installing and using the GUI for programming the EVM

• A Quick-Start Guide for common modes in which the EVM is used

Contents

1 Overview ..................................................................................................................... 2

1.1 TAS5721-TAS5723EVM and Input-USB Board3 Features ................................................... 2

2 Installation .................................................................................................................... 3

2.1 EVM Installation .................................................................................................... 3

2.2 Software Installation ............................................................................................... 6

3 Using the GUI ............................................................................................................... 7

3.1 ControlConsole Quick start ....................................................................................... 7

4 Alternate Configurations ................................................................................................... 9

4.1 BD modulation ...................................................................................................... 9

4.2 PBTL mode ......................................................................................................... 9

5 Jumpers and Control Utilities on Input-USB Board3 .................................................................. 10

5.1 RCA/OPTICAL Jumpers ......................................................................................... 10

5.2 Switches ........................................................................................................... 10

5.3 LED Indicators .................................................................................................... 10

6 Board Layouts, Bill of Materials, and Schematic ...................................................................... 11

6.1 TAS5721-TAS5723EVM Board Layouts ...................................................................... 11

6.2 TAS5721-TAS5723EVM Schematic ........................................................................... 13

6.3 Input-USB Board3 Schematic ................................................................................... 14

6.4 Bill of Materials .................................................................................................... 18

List of Figures

1 Complete System and EVM Signal Path Overview .................................................................... 3

2 BTL Configuration........................................................................................................... 4

3 SE/2.1 Mode Configuration................................................................................................ 5

4 PBTL Configuration......................................................................................................... 5

5 TAS5721-TAS5723EVM Top Composite View........................................................................ 11

6 Input-USB Board3 Top Composite View ............................................................................... 12

7 TAS5721-TAS5723EVM Schematic .................................................................................... 13

8 Input - USB Board3 SPDIF Interface ................................................................................... 14

9 Input - USB Board3 ADC Inputs......................................................................................... 15

10 Input - USB Board3 PSIA Input, Data Select, EVM Connector ..................................................... 16

11 Input - USB Board3 Power Inputs and Supplies ...................................................................... 17

List of Tables

PurePath is a trademark of Texas Instruments.

I2S is a trademark of Philips Electronics.

I2C is a trademark of Philips Semiconductor Corp..

SLOU346–July 2012 TAS5721-TAS5723EVM Evaluation Module

Overview

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1 ControlConsole Process Flow Icons...................................................................................... 8

2 Bill of Materials ............................................................................................................ 18

1 Overview

This EVM demonstrates the TAS5721DCA or TAS5723DCA integrated circuit power stage from Texas

Instruments.

The TAS5721 and TAS5723 are efficient digital audio class D power amplifiers for driving bridge-tied

speakers. Both the TAS5721 and TAS5723 drive 10-W stereo operation. Both devices also support 2.1

mode, with two SE outputs and one BTL output, 2 × 10 W + 1 × 15 W operation. The TAS5721 has

support for an additional headphone output. Review the device’s data sheets at www.ti.com for detailed

information about the TAS5721 and TAS5723.

Together with a TI Input-USB Board 3, this EVM provides a complete stereo digital audio amplifier system

which includes digital input (SPDIF), analog inputs, interface to PC and Digital Audio Processing (DAP)

features like digital volume control, input and output mixers, loudness, EQ filters and dynamic range

compression (DRC). The EVM software facilitates evaluation by providing access to the TAS5721 and

TAS5723 registers through a USB port.

NOTE: The TAS5721-TAS5723EVM is shipped with the current version of TAS5721 installed.

Evaluate the current version of TAS5723 by going to the product folder at www.ti.com and

requesting a free sample; replace TAS5721 with TAS5723.

1.1 TAS5721-TAS5723EVM and Input-USB Board3 Features

• Stereo PurePath™ Digital evaluation module

• Self-contained protection system (overcurrent, overtemperature, and undervoltage).

• Standard I2S™ and I2C™ / Control connector for TI input board

• USB Interface

• Analog input through analog-to-digital converter

• Double-sided plated-through PCB layout, 1-oz copper, 2 mm.

• Ability to control signal gain and DAP features through the EVM-software GUI

2TAS5721-TAS5723EVM Evaluation Module SLOU346–July 2012

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Installation

Figure 1. Complete System and EVM Signal Path Overview

2 Installation

This section describes the EVM power supplies, system interfaces, and software installation. It provides

information regarding handling and unpacking, absolute operating conditions, and switch and jumper

positions. It also provides a step-by-step guide to setting up the EVM for device evaluation.

2.1 EVM Installation

The following are the basic tools needed for the initial EVM power up.

• Power Supply Unit (PSU) for Digital Supply (12 V)

• PSU for PVDD (4.5 V to 26 V)

• Banana-style test leads for power supplies

• Optical or coaxial cable for SPDIF interface based on signal source

• USB cable

• EVM Software

• Speaker or loads for outputs

The following sections describe the EVM board in regards to power supplies (PSU) and system interfaces.

2.1.1 Connecting the EVM to the Input-USB Board3

On the right side of the Input-USB Board3 is a terminal block and another is located on the left of the EVM

(labeled J1). Carefully place the Input-USB Board3 block above the EVM block and gently push down.

2.1.2 Power Supply Interface

The EVM is powered by two PSUs connected to the Input-USB Board3 controller board: a 12-V PSU (VIN),

and a 4.5- to 26-V PVDD PSU. The 3.3- and 5.0-V levels are generated on the board by voltage

regulators from the 12-V supply.

SLOU346–July 2012 TAS5721-TAS5723EVM Evaluation Module

Installation

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NOTE: Minimize the length of the PSU cable. Increasing the length of the PSU cable increases the

distortion of the amplifier at high output levels and low frequencies.

2.1.3 Loudspeaker Connectors

CAUTION

All BTL speaker outputs are biased at Vcc/2 and must not be connected to

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

2.1.3.1 BTL Mode (2.0)

When connecting a speaker in BTL mode, connect one speaker across the connector labeled LEFT and

the other speaker to the connector labeled RIGHT.

Figure 2. BTL Configuration

4TAS5721-TAS5723EVM Evaluation Module SLOU346–July 2012

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Installation

2.1.3.2 SE Mode (2.1)

When connecting speakers in single-ended mode, connect one speaker across the connector labeled SE-

A and the other speaker to the connector labeled SE-B. To run in 2.1 mode, also connect a BTL speaker

across the RIGHT connector (outputs C and D).

Figure 3. SE/2.1 Mode Configuration

2.1.3.3 PBTL Mode

When connecting speakers in a PBTL configuration, short OUT_A and OUT_B after the filter (so short the

two pins of the connector labeled LEFT. Also short OUT_C and OUT_D after the filter (short the two pins

of the connector labeled RIGHT. Connect one end of the speaker to OUT_A/OUT_B and the other end of

the speaker to OUT_C/OUT_D

Figure 4. PBTL Configuration

2.1.4 Headphone/Line-Driver

The TAS5721 has a stereo output which can be used as a headphone amplifier or line driver that can

output 2-VRMS. The headphone amplifier/line-driver on the EVM is configured for unity gain, adjusted by

modifying R1, R2, R4, and R5.

Gain = R2/R1 = R5/R4

SLOU346–July 2012 TAS5721-TAS5723EVM Evaluation Module

Installation

www.ti.com

The analog input goes into the HP-IN headphone jack. Plug the headphones or line-driver load into the

HP-OUT headphone jack. Use a PWM input signal by installing C2, C3, C5, and C6 onto the EVM.

Pressing the HP-SD button on the EVM shuts down the headphone amplifier/line-driver.

2.1.5 USB Interface

The TAS5721 and TAS5723 device registers are accessed through I2C bus lines SDA and SCL. The USB

circuit and USB connector on the Input-USB Board3 board facilitate the connection between a host

computer and the device. The EVM USB circuit is powered by the 5-V USB line of the host PC and is

independent of the PSU available on the board. The USB device is a TAS1020B from Texas Instruments.

The USB input streams audio. Toggling switch S7 to USB selects the USB I2S source over the SPDIF

source.

2.1.6 Digital Audio Interface SPDIF

The Digital Audio Interface SPDIF (RCA/OPTO) accepts digital audio data using the I2S protocol. See the

TAS5721 or TAS5723 data sheet for more information.

The RCA connector and the OPTO connector are the two SPDIF interfaces on the Input-USB Board3. The

switch, S2, toggles between the OPTO and RCA connector (RCA connector labeled as COAX)

accommodating the signal source. When the RCA cable or optical cable is connected and the signal

source is powered up, verify that the SPDIF lock indicator LED illuminates, confirming that a viable signal

is available to the device. Use switch S7 to connect the SPDIF to the digital source SDIN1.

2.1.7 ADC Interface

The PCM1808 ADC is used to convert an analog audio signal to a digital signal for the TAS5721 or

TAS5723. The DIR9001 still provides clock signals to the ADC in this process. A 12.288-MHz crystal is

installed on the Input-USB Board3. The ADC is an additional feature of this board providing flexibility in

sourcing an audio signal to the TAS5721 or TAS5723. Review the PCM1808 data sheet (SLES177) for a

detailed description of the ADC on this EVM. The PCM1808 only accepts up to a 1-VRMS input signal.

Uninstalling jumpers JP300 and JP301 implements a voltage divider that halves the incoming voltage,

allowing input of up to a 2-VRMS signal through the ADC1-IN audio jack.

The EVM uses only one analog input jack, the ADC1-IN. If an analog input is connected, it takes

precedence over any digital audio signal.

2.1.8 General Guidelines for Powering-Up the Board

Connect the Input-USB Board3 and the EVM boards by locating pin 1 on each board, indicated by a small

white triangle. The Input-USB Board3 plugs down onto the EVM board (the TAS5721-TAS5727EVM board

fits underneath the Input-USB Board3). Pin 1 on each board must be connected to each other.

Install the EVM software on the PC before powering up the board. After connecting the loudspeakers or

other loads, PSU, and the data line, power up the PVDD power supply first; then power up the 12-V VIN

power supply.

2.2 Software Installation

Download the TAS57XX Control Console GDE from the TI Web site, located on the TAS5721-

TAS5727EVM product page. The TI Web site always has the latest release and any updates to versions

of the GUI.

Execute the GUI install program, Setup.exe. Once the program is installed, the program group and

shortcut icon is created in Start →Program →Texas Instruments Inc →ControlConsole.

6TAS5721-TAS5723EVM Evaluation Module SLOU346–July 2012

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Using the GUI

3 Using the GUI

This section describes the details of using the TAS57xx ControlConsole Graphical User Interface (GUI)

software tool to interface with the TAS5721 or TAS5723 device. The software is available for download at

the EVM product page on www.TI.com. The GUI's main function provides an easy way to manipulate the

device register space for attaining the required signal processing flow. Clicking the question mark in the

upper right-hand corner of the GUI opens an introductory help file explaining each tab of the GUI. Read

the help file for a complete understanding of the full functionality of the GUI.

3.1 ControlConsole Quick start

3.1.1 Launching ControlConsole

Before opening ControlConsole, power the TAS5721-TAS5723EVM and Input-USB Board3, and connect

the USB cord from the Input-USB Board3 to the computer. When starting ControlConsole an initialization

script runs, turning on the device. If power to the EVM is lost, close ControlConsole and restart it, running

the script again. Alternatively, enter the register values manually using the Direct I2C Access tab.

Select the correct target when opening ControlConsole with the following steps:

• Navigate to the Texas Instruments Inc title in the start program menu

• Open the ControlConsole folder

• Select the correct target, opening ControlConsole

Double check the names of the tabs at the top of the GUI; the device name should be either TSA5721 or

TAS5723 (depending on the IC used). A green circle appears in the lower left-hand corner of the GUI

indicating that communication is established with the board.

3.1.2 Process Flow Tab

The Process Flow tab options with their descriptions are shown in Table 1. Select the correct sample rate

from the drop-down box in the lower left-hand corner of the GUI. While the TAS5721 and TAS5723 auto-

detect the sample rate, the GUI has no way of detecting what the sample rate is.

Make sure the Mode setting in the lower right-hand corner of the GUI is correct. The TAS5721 and

TAS5723 operate in 2.0 or 2.1 modes, depending on the desired speaker configuration. There is not a

quick PBTL set-up option. Section 4 explains the PBTL set up.

When finished setting-up, make sure the device is out of shutdown. In the lower right-hand corner of the

Process Flow tab, the Shutdown button reads Exit if it is out of shutdown, and Enter if it is in shutdown.

Click to toggle between the two.

At this point, the device should stream audio. Use the Direct I2C Access tab for writing directly to the

TAS572X registers. Use the TAS5723 Registers tab for viewing the current register values, as well as for

modifications of individual bits.

3.1.3 Summary of Steps

1. Power the TAS5721-TAS5723EVM and Input-USB Board3

2. Connect the Input-USB Board3 to the computer with a USB cable

3. Open ControlConsole GUI with the correct target:

(a) Verify that the GUI displays the correct device name

(b) Verify that a green dot is displayed in the lower left-hand corner of the screen. If the dot is red,

verify that the EVM is powered correctly and that the USB cable is connected from the computer

running ControlConsole to the EVM.

4. Go to the TAS572X Process Flow tab

5. Set the correct sample rate in the lower left-hand corner

6. Select the correct speaker configuration in the lower right-hand corner under Mode

7. Make sure that the device is out of Shutdown

The EVM should now stream audio.

SLOU346–July 2012 TAS5721-TAS5723EVM Evaluation Module

Using the GUI

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Table 1. ControlConsole Process Flow Icons

Name Symbol Function Interaction

Implement IIR filters

in the DAP by using • Open the Biquad GUI by double

the biquad filters. clicking

Biquad They are often used • Open the Biquad GUI or the biquad-

for speaker specific help page by right clicking

equalization.

Each mixer adds

two or more signals • Click the dial and drag up, increasing

together. The dials volume; drag down, decreasing

Mixer allow for the user to volume.

adjust the scalar Note: this is a vertical movement,

multiplier for each not circular

input signal.

Clicking the MUX

changes the active • Click to change the pass-through

Mux path. This allows the path. The active path is black,

creation of a variety inactive paths are grayed out

of process flows.

• Single click turns on and off

• Right click options:

The DRC tool allows

Dynamic Range for adjustments to – Turns on or off

Control (DRC) the dynamic range – Opens DRC GUI

of the signal. – Opens DRC-specific help

page

Several volume

ganging sets are

available. When a • Clicking and dragging the slider

particular ganging adjusts the volume

setting is applied, • Type a volume in the text box below

Volume Ganging the matched volume the slider (where 0currently is)

sliders are color • Right clicking opens the Volume

coded. Moving one Ganging menu

slider will move all

sliders of the same

color.

The master volume • Clicking and dragging the slider

is a simple way to adjusts the volume

adjust the final • Type a volume in the text box below

volume of the the slider (where 8currently is)

Master Volume output. The pre- and • Clicking the speaker symbol mutes

post-output volume and unmutes the device

sliders also adjust

the final volume of • Right clicking mutes and unmutes

the audio signal. the device

8TAS5721-TAS5723EVM Evaluation Module SLOU346–July 2012

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Alternate Configurations

4 Alternate Configurations

The EVM is designed to easily allow for AD modulation in SE or BTL mode. To use BD modulation or

PBTL mode, the EVM must be modified.

4.1 BD modulation

Hardware:

1. Remove C25 from the EVM.

GUI:

1. On the TAS572X Block Diagram tab, click the Input Mux block.

2. Select BD mode for channel 1 and channel 2.

3. Enter "0x11" in the address line and B8 in the data line, then click Write.

4. Enter "0x12" in the address line and 60 in the data line, then click Write.

5. Enter "0x13" in the address line and A0 in the data line, then click Write.

6. Enter "0x14" in the address line and 48 in the data line, then click Write.

The previous four steps changed the intermodulation delay registers to their optimum values for BD

modulation. The device now operates with BD modulation.

4.2 PBTL mode

Hardware:

1. Short OUT-A to OUT-B and OUT-C to OUT-D after the filter by shorting the two pins on the AB LEFT

connector and the CD RIGHT connector.

2. Connect the speaker as outlined in Section 2.1.3.

GUI:

1. Start the TAS5721-TAS5723 as if in BTL mode.

2. Make sure the device is in shutdown. Change this by selecting the option in the lower right-hand corner

of the TAS5721 Process Flow tab, Enter means the device is in shutdown.

3. Go to the Direct I2C Access tab in ControlConsole.

4. Enter "0x25" in the address line (PWM Output MUX Register).

5. Enter "01 00 22 45" in the data line (this outputs PWM1 to OUT_A/OUT_B and PWM3 to

OUT_C/OUT_D).

6. Click Write.

7. Enter "0x19" in the address line (PWM Shutdown Group Register).

8. Enter "3A" in the data line (this shuts down the unused PWM outputs).

9. Click Write.

10. Exit shutdown by selecting the option in the lower right-hand corner of the TAS5721 Process Flow tab,

Exit means the device is out of shutdown.

The EVM is now operating in PBTL mode.

SLOU346–July 2012 TAS5721-TAS5723EVM Evaluation Module

Jumpers and Control Utilities on Input-USB Board3

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5 Jumpers and Control Utilities on Input-USB Board3

5.1 RCA/OPTICAL Jumpers

•ADC1: The default is to have a jumper installed on pins 2 and 3. To input an external I2S data signal,

remove the jumper and connect the new I2S source using pins 3 and 4.

•MCLK: The default is to have a jumper installed on pins 2 and 3. To input an external MCLK signal,

remove the jumper and connect the new MCLK source using pins 3 and 4.

•SCLK: The default is to have a jumper installed on pins 2 and 3. To input an external SCLK signal,

remove the jumper and connect the new SCLK source using pins 3 and 4.

•LRCLK: The default is to have a jumper installed on pins 2 and 3. To input an external LRCLK signal,

remove the jumper and connect the new LRCLK source using pins 3 and 4.

•JP300 and JP301: Install for analog inputs of less than 1-VRMS; leave uninstalled for analog inputs from

1-VRMS to 2-VRMS.

• All other jumpers on the Input-USB Board3 have no functionality with the TAS5721-TAS5723EVM.

5.2 Switches

•S1 (RESET): Pressing the RESET switch resets the TAS572X device

•S2 (COAX/OPTO): Determines which digital input to use, RCA or optical.

•S3 (VOL DOWN): This switch has no function with the EVM

•S4 (VOL UP): This switch has no function with the EVM

•S5 (USB MUTE): This switch has no function with the EVM

•S6 (MUTE): This switch has no function with the EVM

•S7 (I2S SELECT): Selects the I2S source. When using the OPTO or RCA inputs, flip this switch to

SPDIF.

•S8 (PDN): Pressing PDN powers down the TAS572X.

5.3 LED Indicators

•12 V: 12-V power is valid

•5 V: 5-V power is valid

•3.3 V: 3.3-V power is valid

•SPDIF-LOCK: SPDIF signal locked

•COAX: S2 is set to the COAX position

•OPTO: S2 is set to the OPTO position

•USB: S7 is set to the USB position

•SPDIF: S7 is set to the SPDIF position

•FAULT: not used with the EVM

•PDN: indicates that the PDN switch is asserted

•MUTE: not used with the EVM

•SHUTDOWN: not used with the EVM

•OTW: not used with the EVM

•DIGITAL: indicates that the digital input source is active

•ANALOG: indicates that the analog input source is active

10 TAS5721-TAS5723EVM Evaluation Module SLOU346–July 2012

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