Texas Instruments TAS5727 User Manual
User's Guide
SLOU299–December 2010
TAS5727 25W Digital Input Amplifier
with EQ and 2-Band DRC
This manual describes the operation of the TAS5727EVM to evaluate the performance of the TAS5727
integrated digital audio power amplifier. The main contents of this document are:
• How to properly connect a TAS5727 Evaluation Module (EVM) and the details of the EVM
• How to install and use the GUI to program the TAS5727EVM
• How to use the audio processing features such as EQ and Dynamic Range Control (DRC)
• Quick-Start Guide for the common modes in which TAS5727EVM can be used
Contents
1 Overview ..................................................................................................................... 2
1.1 TAS5727EVM and MC57xxPSIA Features ..................................................................... 3
2 Installation .................................................................................................................... 3
2.1 EVM Installation .................................................................................................... 3
2.2 Software Installation ............................................................................................... 5
3 Using the EVM Software ................................................................................................... 8
3.1 Connect the GUI to the EVM ..................................................................................... 8
3.2 I
3.3 Volume Function ................................................................................................... 9
3.4 Biquad GUI ......................................................................................................... 9
3.5 DRC GUI ........................................................................................................... 10
4 Jumpers and Control Utilities on MC57xxPSIA board ................................................................ 13
4.1 RCA/OPTICAL Jumpers ......................................................................................... 13
4.2 Switches ........................................................................................................... 13
4.3 LED Indicators .................................................................................................... 13
5 Board Layouts, Bill of Materials, and Schematic ...................................................................... 14
5.1 TAS5727EVM and MC57xxPSIA Board Layouts ............................................................ 14
5.2 Bill of Materials .................................................................................................... 15
5.3 Schematics ........................................................................................................ 16
2
C Memory Tool ................................................................................................... 8
List of Figures
1 TAS5727EVM Printed-Circuit Board ..................................................................................... 2
2 Complete System and EVM Signal Path Overview .................................................................... 2
3 General Connection Picture ............................................................................................... 3
4 Connecting TAS5727EVM to MC57xxPSIA............................................................................. 4
5 BTL Connection............................................................................................................. 5
6 Process Structure........................................................................................................... 7
7 Main GUI Display ........................................................................................................... 8
8 Memory Tool Window ...................................................................................................... 8
9 Volume Control.............................................................................................................. 9
10 Selecting Biquad GUI....................................................................................................... 9
11 Biquad GUI Window....................................................................................................... 10
Equibit is a trademark of Texas Instruments.
I2C is a trademark of Philips Corporation.
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2CH Analog Input
From Other Source/
Digital Out
PC Interface
SPDIF/
Optical, Coax
TAS5727
Left
Right
TAS5727 EVMMC57xxPSIA
PBTL
Overview
12 DRC Options............................................................................................................... 11
13 Advanced DRC Options .................................................................................................. 11
14 TAS5727EVM Top Composite Assembly .............................................................................. 14
15 MC57xxPSIA Top Composite Assembly ............................................................................... 14
1 Recommended Power Supplies........................................................................................... 4
2 Bill of Materials for TAS5727EVM ...................................................................................... 15
1 Overview
The TAS5727EVM evaluation module demonstrates the TAS5727 device from Texas Instruments. The
TAS5727 combines a high-performance PWM processor with a class-D audio power amplifier. This EVM
can be configured with two bridge-tied loads (BTL) (2.0). For detailed information about the TAS5727EVM
device, review the (device data sheet SLOS637). The Pulse Width Modulator (PWM) is based on TI's
Equibit™ technology. The TAS5727 has additional audio processing features like 3D, Bass Boost and
2-band DRC.
The EVM software, with its graphic user interface (GUI), facilitates evaluation by providing access to the
TAS5727EVM registers through a USB port. See the Using the EVM Software section for further details.
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List of Tables
2
Figure 1. TAS5727EVM Printed-Circuit Board
The EVM together with other TI components on this board, is a complete 2.0-channel digital audio
amplifier system. The MC57XXPSIA Controller board includes a USB interface, a digital input (SPDIF),
analog inputs via the ADC, power inputs, and other features like a mute function and power down.
Figure 2. Complete System and EVM Signal Path Overview
TAS5727 25W Digital Input Amplifier—with EQ and 2-Band DRC SLOU299–December 2010
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Analog In to ADC
Coaxial SPDIF Input
Optical SPDIF Input
USB Port
5V Supply for
System Power
8V–26V Supply for Output Power
Speaker
Out PBTL
Speaker
Out C & D
Speaker
Out A & B
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1.1 TAS5727EVM and MC57xxPSIA Features
• Channel evaluation module design
• Self-contained protection systems and control pins
• USB interface
• Standard I2S data input using optical or coaxial inputs
• Analog input through analog-to-digital converter
• Subwoofer connection—the PWM terminal provides the PWM signal and power to an external
subwoofer board
• Double-sided, plated-through PCB, 1oz copper, 2mm
• Access to control signal gain and data format through EVM-software GUI
2 Installation
This section describes the EVM and software installation.
2.1 EVM Installation
Installation
The following are the basic tools for the initial EVM power up.
• 5V, 1A power supply (VIN)
• 8–26V, 4A power supply (PVDD)
• Banana-plug test leads for power supplies and speakers
• Optical or coaxial cable for SPDIF interface based on signal source
• USB cable
• EVM software
• Two 8Ω speakers or loads
The following sections describe the TAS5727EVM board in regards to power supply (PSU) and system
interfaces.
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Figure 3. General Connection Picture
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Installation
2.1.1 Connecting the TAS5727EVM to MC57xxPSIA
On the right side of the MC57xxPSIA is a terminal block and another on the left of the TAS5727EVM
(labeled J1). Carefully place the MC57xxPSIA block above the TAS5727EVM block and gently push down.
Figure 4. Connecting TAS5727EVM to MC57xxPSIA
2.1.2 PSU Interface
The TAS5727EVM is powered by two power supplies connected to the MC57xxPSIA controller board: a
5V power supply (VIN), and a 8V-to-26V (PVDD) power supply. The 3.3V level is generated from the 5V
supply by an on-board voltage regulator.
NOTE: The power-supply cable length must be minimized. Increasing the length of the PSU cable
increases the distortion of the amplifier at high output levels and low frequencies.
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The maximum output-stage supply voltage depends on the speaker load resistance. See the
recommended maximum supply voltage in the TAS5727EVM data sheet.
Description Voltage Limitations (8-Ω Load) Current Recommendations
System power supply 5V 1A
Output power stage supply 8–26V 4A
(1)
The rated current corresponds to two channels, full scale.
2.1.3 Loudspeaker Connectors
All speaker outputs are biased at Vcc/2 and must not be connected to ground
(e.g., through an oscilloscope ground).
Loudspeaker connections vary by device setup. When connecting a speaker in BTL mode, connect the
speaker’s two terminals (A and B or C and D) across two outputs on the TAS5727EVM.
Speakers or loads can be connected to the outputs A-D with clip leads, or cables can be made
with female connectors (JST VHR-2N) that can mate to male connectors on the EVM board.
Table 1. Recommended Power Supplies
(1)
CAUTION
4
TAS5727 25W Digital Input Amplifier—with EQ and 2-Band DRC SLOU299–December 2010
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+
–
OUTB
OUT A
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2.1.4 USB Interface
The TAS5727 registers are accessed through I2C™ bus lines SDA and SCL. The USB circuit and USB
connector on the MC57xxPSIA board facilitates the connection between a host computer and the device.
The EVM USB circuit is powered by the 5V USB line of the host PC and is independent of the power
supplies available on the board. The USB device that is used is a TAS1020B from Texas Instruments.
2.1.5 Digital Audio Interface SPDIF
The Digital Audio Interface SPDIF (RCA/OPTO) accepts digital audio data using the I2S protocol. See the
TAS5727 data sheet for more information.
The RCA connector and the OPTO connector are the two SPDIF interfaces on the MC57xxPSIA board.
The switch S3 toggles between the OPTO and RCA connector to accommodate 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 (blue LED5) illuminates, confirming that a viable signal is available to the device. Install a
jumper on JP4 across the middle pin and the pin marked SPDIF to connect the digital source to SDIN1.
Install a jumper on JP5 to connect the digital source to SDIN2.
For detailed information on how the data and clocks are provided to the TAS5727, see the schematic
appearing at the end of this document and the DIR9001 device data sheet (SLES198).
Installation
Figure 5. BTL Connection
2.1.6 ADC Interface
In the absence of a digital signal source, the PCM1808 ADC can be used to convert an analog audio
signal to a digital signal to the TAS5727. The DIR9001 still provides clock signals to the ADC in this
process. A 12MHz crystal is installed on the MC57xxPSIA board. The ADC is an additional feature of this
board to provide flexibility in sourcing an audio signal to the TAS5727. Review the PCM1808 data sheet
(SLES177) for a detailed description of the ADC on this EVM. Install the jumper on JP4 across the middle
pin and the pin marked ADC to select ADC as the source for SDIN1.
2.1.7 Board Power-Up General Guidelines
Connect theMC57xxPSIA and the TAS5727EVM boards by locating pin 1 on each board, indicated by a
small white triangle. TheMC57xx plugs down onto the TAS5727EVM board (i.e., the TAS5727EVM board
fits underneath the MC57xxPSIA board). 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, power supplies, and the data line, power up the 5V power supply first; then power up the
PVDD power supply. It is recommended initially to set the PVDD level to 10V, then ramp it up to 20V to
verify cable connections.
2.2 Software Installation
Download the TAS57x UI from the TI Web site. The TI Web site always has the latest release and any
updates to versions of the GUI.
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Installation
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 → TAS57x UI. The GUI launches as
shown in Figure 7.
The TAS5717 tab opens when the GUI starts. Select Devices → TAS57XX → TAS5727 to open the
TAS5727 tab. This tab has two subwindows. One shows the Process Flow window. From the Process
Flow window, each of the signal-processing function tools can be selected by clicking on it. The Biquad
GUI and the DRC GUI can be opened by right-clicking. This window also shows Input select, Mode select,
Channel, and Master Volume. All functions are shown in the same order as in the device.
The other subwindow, the Properties window, has the properties that a user can update by selecting from
the available options. The properties available depend on the device selected.
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TAS5727 25W Digital Input Amplifier—with EQ and 2-Band DRC SLOU299–December 2010
© 2010, Texas Instruments Incorporated
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R
L
9BQ
9BQ
B0321-11
0x72
0x76
0x73
0x77
27–2F
I C Subaddress in Red
2
I C:57
VDISTB
2
I C:0x6B (32Bit-Left Level)
Right Level)
2
I C:0x6C (32 Bit-
2
I C:56
VDISTA
2
31–39
2BQ
5A, 5B
2BQ
5E, 5F
Vol2
Vol1
AGL
Vol
Vol Config Reg 0x0E
Vol
AGL
0x71
0x74 v2im1
0x75
0x46[0]
0x46[1]
0x70
2BQ
2BQ
58, 59
0x51[1]
5C, 5D
1BQ
1BQ
26
30
0x51[0]
0x52[1]
0x52[0]
32
24
24
32
Level
Meter
32
32
clip24
clip24
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Installation
SLOU299–December 2010 TAS5727 25W Digital Input Amplifier—with EQ and 2-Band DRC
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Figure 6. Process Structure
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