Texas Instruments TPA2050D4EVM User manual

1 Introduction
1.1 Description
User's GuideSLOU206 – July 2008
TPA2050D4EVM Evaluation Module
Contents1 Introduction ................................................................................................................... 12 Operation ..................................................................................................................... 23 TPA2050D4EVM Schematic ............................................................................................... 84 TPA2050D4EVM PCB Layers ............................................................................................. 95 TPA2050D4EVM Parts List ............................................................................................... 11
List of Figures
1 Stereo Differential Mode Input Configuration ............................................................................ 32 Non-Differential Mode Input Configuration ............................................................................... 33 Place Shunts Horizontally Across SCL and SDA ........................................................................ 44 Starting the Software ........................................................................................................ 55 Software Interface ........................................................................................................... 66 Connect I
2
C Controls to JP3 ............................................................................................... 77 TPA2050D4EVM Schematic ............................................................................................... 88 TPA2050D4EVM – Top Layer ............................................................................................. 99 TPA2050D4EVM – Layer 2 ................................................................................................ 910 TPA2050D4EVM – Layer 3 ............................................................................................... 1011 TPA2050D4EVM – Bottom Layer ........................................................................................ 10
List of Tables
1 Jumpers Default Setting .................................................................................................... 22 Test Points Information ..................................................................................................... 43 TPA2050D4EVM Parts List ............................................................................................... 11
The TPA2050D4 is a stereo Class-D power amplifier along with a stereo DirectPath™ headphoneamplifier. Both input channels have 32-step volume control and the DirectPath™ headphone amplifier hasa 4-step level gain control with power limiter. The volume is controlled through an I
2
C™ interface. Allamplifiers have output short-circuit and thermal-overload protection.
The TPA2050D4 evaluation module(EVM) is a complete, stand-alone audio board. It contains theTPA2050D4 WCSP(YZK) Class-D audio subsystem.
All components and the EVM are Pb free.
DirectPath is a trademark of Texas Instruments.Windows is a trademark of Microsoft Corporation.I
2
C is a trademark of Philips Electronics.
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1.2 TPA2050D4EVM Specifications
2 Operation
2.1 Quick Start for Stand-Alone Operation
2.1.1 Software Installation Sequence
2.1.2 Evaluation Module Setup
Operation www.ti.com
VDD Supply voltage range –0.3 V to 6 VIDD Supply current 1.5 A MaximumPO Speaker Continuous output power per channel, 8 Ω, Vdd = 5 V, THD + N = 1% 1.25 WHeadphone Continuous output power per channel, 16 Ω, Vdd = 5 V, THD + N = 1% 145 mWRL Minimum load impedance (Speaker) 8 ΩMinimum load impedance (Headphone) 16 Ω
The TPA2050D4EVM can be evaluated in a stand-alone mode or when connected to existing circuits withI
2
C controls.
A desktop or laptop with Windows™ XP installed is required in the stand-alone operation. Connect theEVM to a computer with a USB cable. A jumper allows the TPA2050D4 to receive power from either theUSB or an external supply via banana plugs. The inputs accept standard RCA plugs. The speaker outputconnection accepts banana plugs. The headphone output connection accepts standard 3.5-mmheadphone plugs.
1. Insert the CD provided.2. Unzip the files to a temporary folder.3. Install TPA2050D4 software by executing setup.exe located in TPA2050D4 Setup.
Accept license agreement and defaults, and complete installation. Note: you can uninstall later withAdd/Remove Programs. It is unnecessary to repeat the preceding steps, once the software is installed.
1. Configure the jumpers as the following table for a default setting:
Table 1. Jumpers Default Setting
Jumper Default Setting
JP1 (DVDD) ShuntJP2, JP3 Shunt across each otherJP4 ShuntJP5, JP6, JP7, JP8 As shown in Figure 2JP9 (USB PWR) Remove
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Left Channel
Plugs Here
Right Channel
Plugs Here
LR
Stereo 1
RCA Plugs
Here
Stereo 2
RCA Plugs
Here
RLL R
www.ti.com Operation
2. There are different modes of input operation in for TPA2050D4, configure the input according to thefollow:
a. Stereo Differential Mode (MODE[2:0] = 011):Install shunts and connect RCA plugs as shown in Figure 1 .
Figure 1. Stereo Differential Mode Input Configuration
b. For all other modes, install shunts and connect RCA plugs as shown in Figure 2 .
Figure 2. Non-Differential Mode Input Configuration
3. Install shunts in JP2 and JP3 as shown in Figure 3 . This sets the TPA2050D4 to accept I
2
C inputsfrom the EVM itself.
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Shunts, Across SCL and SDA
Operation www.ti.com
Figure 3. Place Shunts Horizontally Across SCL and SDA
4. Ensure that all external power sources are set to OFF.5. Connect an external regulated power supply adjusted from 2.5 V to 5.5 V to the module VDD (J5) andGND (J6) banana jacks, taking care to observe the marked polarity.6. Install shunt in JP1 if DVDD is powered by the 1.8 V regulated supply from the EVM itself. If DVDD ispowered by another supply(between 1.8 V and 3.3 V), remove shunt in JP1 and connect the supply atheader 1 of JP1.7. HPVDD is set to VDD by default. If HPVDD is powered by another supply (between 2.5 V and 5.5 V),remove R17 and connect the supply at TP24.8. Connect audio source as mentioned in step 2.9. Connect headphones to J4.10. Connect speakers (8 Ωto 32 Ω) to the output (J11, J12 for LOUT and J13, J14 for ROUT). Thespeakers can also be connected to J2 and J3 if header connection is available in the speakers.11. Plug in the USB.12. Turn on power sources.13. The TPA2050D4 can also be powered by USB cable if the audio amplifier output power is less than100mW. Shunt JP9 and remove the power supply at J5 and J6 for USB power option.14. The following table provides the test points information on the EVM:
Table 2. Test Points Information
Test Point Description
TP1, TP2, TP3, TP4 OUTR+, OUTR-, OUTL-, OUTL+TP5, TP6, TP7, TP8 Filtered OUTR+, OUTR-, OUTL-, OUTL+TP9 HPVSSTP10 INR_1TP11 INL_1TP12 INL_2TP13 INR_2T14 HPRIGHTT15 HPLEFTTP18 DVDDTP20 SCLTP23 SDATP24 HPVDDTP27 VREFTP19, TP21, TP22, TP25, TP26 GND
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2.1.3 Using the Software
www.ti.com Operation
1. Start the TPA2050D4 Interface by clicking the Start menu and clicking on the Texas Instruments Inc ->TPA20050D4 icon.
Figure 4. Starting the Software
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Operation www.ti.com
2. The TPA2050D4 software interface is as shown in Figure 5 .
Figure 5. Software Interface
Note: The TPA2050D4 powers up with the amplifiers disabled, muted, and the gain set to theminimum. To hear an output, enable and unmute each channel, and set the gain to a higherlevel.
3. Follow these steps only if using a PC is both the music source and the computer on which theTPA2050D4 GUI is run.
When using WinXP, if after initially installing the software, the PC does not play music out of theheadphone jack:a. Open the Control Panel.b. Click on Sounds, Speech, and Audio Device Link under the Control Panel.c. Click on Sounds and Audio Device Properties link.d. Click on the Audio tab.e. Verify that the Default device under Sound playback is the audio driver of the PC HW, not theUSBMODEVM TPA2050D4 GUI driver.f. Change the driver in the menu to the PC Audio HW driver.g. Click on OK.4. Click the button in SW Shutdown to activate/deactivate software shutdown.5. Click the button in Speaker Output to enable/disable speaker output.6. Click the button in HP Output to enable/disable headphone output.A. Check/uncheck HP Left Mute to place headphone left output in/out of mute.B. Check/uncheck HP Right Mute to place headphone right output in/out of mute.7. Select input mode in the Channel Mode.8. Adjust the volume for both channels of the speaker amplifier by sliding the bar in Chan 1 and Chan 2.9. Adjust the headphone gain in HP Gain by sliding the bar.10. Select the headphone limiter level by clicking the voltage limit.11. Select the headphone impedance in Load Resistance, the Headphone Limiter Power Level will be
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2.2 Quick Start List When Connected to External I
2
C Controller
2.2.1 Evaluation Module Setup
GND
SCL
SDA
GND
External I C
Source
2
www.ti.com Operation
displayed.
12. I2C Status box reports the status of I
2
C communications. An error or failure has occurred if it turnsred.
13. Thermal box reports the status of thermal failure. A thermal fault has occurred if it turns red.14. The GUI has a built-in I2C programming interface. It has a log feature to record the changes that wasmade in the GUI. Follow the steps below to use the I2C programming function.
•At the top left corner of the GUI, click File to access the I2C programming interface.•Save Script can record the current register values. Select Save Script >> Click the folder icon tobrowse to the place where you want to save the script >> name the file in txt format then select OKto save.•Load Script can load the previously saved script to program the entire register file. Select LoadScript >> Click the folder icon to browse to the place where the script is located >> Select the filethen click OK >> Click Load.•I2C interface can program individual register value of TPA2050D4. Select I2C Interface >> I2Caddress is xE0, which is the address of TPA2050D4. Device address is from 1 to 7, which is theregister address of TPA2050D4.•Record Script can record all the changes made in the GUI and store the changes in a text file.Select Record Script >> Click the folder icon to browse to the place where you want to record thescript and then name the file in txt format >> Click Record Off to Record On, the green light will turnred to indicate that the recording is activated >> Click Exit >> Make changes in the GUI >> SelectRecord Script >> Click Record On to Record Off. The red light will turn green to indicate that therecording is deactivated. >> Click exit. All the changes will be recorded in the selected txt file.
The TPA2050D4EVM can be easily connected to existing circuits with I
2
C controls. Connections to theEVM module can be made using banana plugs for the power supply. The inputs accept standard RCAplugs. The output connection accepts standard 3.5-mm headphone plugs.
1. Install shunts in jumpers JP4. Remove shunts in JP2 and JP3 and connect I
2
C controls to JP3 asshown in Figure 6 .2. There are 2 options to power DVDD.•a. Connect USB cable to supply 1.8V for DVDD and remove R17.•b. Disconnect USB cable. Remove JP1 and connect an external power supply(from 1.75 V to 1.95V) at TP18 (to DVDD).
Figure 6. Connect I
2
C Controls to JP3
3. For all the other connections, follow the steps in section 2.1.2.
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3 TPA2050D4EVM Schematic
TPA2050D4EVM Schematic www.ti.com
Figure 7. TPA2050D4EVM Schematic
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4 TPA2050D4EVM PCB Layers
www.ti.com TPA2050D4EVM PCB Layers
Figure 8. TPA2050D4EVM – Top Layer
Figure 9. TPA2050D4EVM – Layer 2
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TPA2050D4EVM PCB Layers www.ti.com
Figure 10. TPA2050D4EVM – Layer 3
Figure 11. TPA2050D4EVM – Bottom Layer
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