Texas Instruments TLV320AIC3107EVM-K User manual

User's GuideSLAU261 – November 2008
TLV320AIC3107EVM-K
This user's guide describes the characteristics, operation, and use of the TLV320AIC3107EVM-K. Thisevaluation module (EVM) allows the user to evaluate the TLV320AIC3107 audio codec. TheTLV320AIC3107 is a complete 2-channel audio codec with an integrated Class-D speaker amplifier. It alsohas many inputs and outputs, extensive audio routing, mixing, and effects capabilities. A complete circuitdescription, schematic diagram, and bill of materials are included. Note that the TLV320AIC3107 onlyuses the I
2
C™ bus for register control. Any references to the SPI control bus in this document is due tothe presence of this interface on the USB-MODEVM motherboard.
Note: For a quick start, go directly to Section 3.1 Software Installation, followed by Section 3.2EVM Connections, and then to Section 4.1 Quick Start Tabs.
The following related documents are available through the Texas Instruments Web site at www.ti.com .
EVM-Compatible Device Data Sheets
Device Literature Number
TLV320AIC3107 SLOS545TAS1020B SLES025REG1117-3.3 SBVS001TPS767D318 SLVS209SN74LVC125A SCAS290SN74LVC1G125 SCES223SN74LVC1G07 SCES296
Contents1 EVM Overview ............................................................................................................... 32 EVM Description and Basics ............................................................................................... 33 TLV320AIC3107EVM-K Setup and Installation .......................................................................... 74 TLV320AIC3107EVM Software ............................................................................................ 8Appendix A EVM Connector Descriptions ................................................................................... 33Appendix B TLV320AIC3107EVM Schematic ............................................................................... 36Appendix C TLV320AIC3107EVM Layout Views ........................................................................... 38Appendix D TLV320AIC3107EVM Bill of Materials ......................................................................... 41Appendix E USB-MODEVM Schematic ...................................................................................... 43Appendix F USB-MODEVM Bill of Materials ................................................................................ 44Appendix G USB-MODEVM Protocol ......................................................................................... 46
List of Figures
1 TLV320AIC3107EVM-K Block Diagram .................................................................................. 42 Quick Start - USB-MODEM Configurations .............................................................................. 83 Quick Start - Preset Configurations Tab .................................................................................. 94 Main Software Screen .................................................................................................... 105................................................................................................................................ 116 Audio Input/ADC Tab ..................................................................................................... 12I
2
C, I
2
S are trademarks of Koninklijke Philips Electronics N.V..Windows is a trademark of Microsoft Corporation.LabView is a trademark of National Instruments.
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7 Bypass Paths Tab .......................................................................................................... 138 Audio Interface Tab ....................................................................................................... 149 Clocks Tab ................................................................................................................. 1510 GPIO1 Tab ................................................................................................................. 1711 AGC Tab .................................................................................................................... 1812 Left AGC Settings .......................................................................................................... 1913 Advanced .................................................................................................................... 1914 Filters Tab .................................................................................................................. 2015 ADC High-Pass Filters .................................................................................................... 2116 ADC High-Pass Filter Settings ........................................................................................... 2117 DAC Filters .................................................................................................................. 2218 De-emphasis Filters ........................................................................................................ 2219 Enabling Filters ............................................................................................................ 2320 Shelf Filters ................................................................................................................. 2321 EQ Filters ................................................................................................................... 2422 Analog Simulation Filters ................................................................................................. 2423 Preset Filters ............................................................................................................... 2524 User Filters ................................................................................................................. 2525 3D Effect Settings ......................................................................................................... 2626 DAC/Line Outputs Tab .................................................................................................... 2627 Output Stage Configuration Tab ......................................................................................... 2828 High Power Outputs Tab ................................................................................................. 2929 Class-D Output Tab ........................................................................................................ 3030 Command Line Interface Tab ............................................................................................ 3131 File Menu ................................................................................................................... 32C-1 Assembly layer ............................................................................................................. 38C-2 Top Layer .................................................................................................................... 38C-3 Layer 3 ....................................................................................................................... 39C-4 Layer 4 ....................................................................................................................... 39C-5 Bottom Layer ................................................................................................................ 40
List of Tables
1 USB-MODEVM SW2 Settings ............................................................................................. 52 List of Stand-alone Jumpers ............................................................................................... 53 Switch SW1 Configurations ................................................................................................ 64 Switch SW2 Configurations ................................................................................................ 65 Switch SW3 Configurations ................................................................................................ 6A-1 Analog Input/Output Connectors ......................................................................................... 33A-2 Block A and Block B Digital Interface Pinout ........................................................................... 34A-3 Power Supply Pinout ....................................................................................................... 35D-1 TLV320AIC3107EVM Bill of Materials ................................................................................... 41F-1 USB-MODEVM Bill of Materials .......................................................................................... 44G-1 USB Control Endpoint HIDSETREPORT Request .................................................................... 46G-2 Data Packet Configuration ................................................................................................ 46G-3 GPIO Pin Assignments .................................................................................................... 49
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1 EVM Overview
1.1 Features
1.2 Introduction
2 EVM Description and Basics
2.1 TLV320AIC3107EVM-K Block Diagram
www.ti.com EVM Overview
•Full-featured evaluation board for the TLV320AIC3107 2-channel audio codec with integrated Class-Damplifier.
•Modular design for use with a variety of digital signal processor (DSP) and microcontroller interfaceboards.
•USB connection to PC provides power, control, and streaming audio data for easy evaluation.•Onboard microphone for ADC evaluation•Connection points for external control and digital audio signals for quick connection to othercircuits/input devices.
The TLV320AIC3107EVM-K is a complete evaluation kit, which includes a universal serial bus(USB)-based motherboard and evaluation software for use with a personal computer (PC) running theMicrosoft Windows™ operating system (Win2000 or XP).
The TLV320AIC3107EVM is in the Texas Instruments modular EVM form factor, which allows directevaluation of the device performance and operating characteristics, and eases software development andsystem prototyping. This EVM is compatible with the 5-6K Interface Evaluation Module (SLAU104 ) and theHPA-MCUINTERFACE (SLAU106 ) from Texas Instruments and additional third-party boards whichsupports the TI Modular EVM format.
The TLV320AIC3107EVM-K is a complete evaluation/demonstration kit, which includes a USB-basedmotherboard called the USB-MODEVM Interface board and evaluation software for use with a PC runningthe Microsoft Windows operating systems.
The USB connection from the PC provides power, control, and streaming audio data to the EVM forreduced setup and configuration. The EVM also allows external control signals, audio data, and power foradvanced operation, which allows prototyping and connection to the rest of the evaluation/developmentsystem.
This section provides information on the analog input and output, digital control, power, and generalconnection of the TLV320AIC3107EVM.
The TLV320AIC3107EVM-K consists of two separate circuit boards, the USB-MODEVM and theTLV320AIC3107EVM. The USB-MODEVM is built around a TAS1020B streaming audio USB controllerwith an 8051-based core.
The simple diagram of Figure 1 shows how the TLV320AIC3107EVM is connected to the USB-MODEVM.The USB-MODEVM Interface board is intended to be used in USB mode, whereas control of the installedEVM is accomplished using the onboard USB controller device. Provision is made, however, for driving allthe data buses (I
2
C, I
2
S, etc.) externally. The source of these signals is controlled by SW2 on theUSB-MODEVM. See Table 1 for details on the switch settings.
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2.1.1 USB-MODEVM Interface Board
EVM Position 2
EVM Position 1
TLV320AIC3107EVM
Control Interface
TLV320AIC3107
TAS1020B
USB 8051
Microcontroller
USB
I C
2
I S
2
Audio Interface
USB-MODEVM
EVM Description and Basics www.ti.com
The simple diagram of Figure 1 shows only the basic features of the USB-MODEVM Interface board.
When connecting the TLV320AIC3107EVM to the USB-MODEVM, use care to avoid bending theconnecting pins. The two boards can only be connected in one way. It is suggested to first align with the10-pin connectors (J3 on the TLV320AIC3107EVM and J18A on the USB-MODEVM) and then gentlypush all the connectors together until the boards are seated.
In the factory configuration, the board is ready to use with the TLV320AIC3107EVM. To view all thefunctions and configuration options available on the USB-MODEVM board, see the USB-MODEVMInterface Board schematic in Appendix E.
Figure 1. TLV320AIC3107EVM-K Block Diagram
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2.2 Default Configuration and Connections
2.2.1 USB-MODEVM
2.2.2 TLV320AIC3107EVM Jumpers and Switches
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Table 1 provides a list of the SW2 settings on the USB-MODEVM. For use with the TLV320AIC3107EVM,SW-2 positions 1 through 7 must be set to ON (LO), whereas SW-2.8 must be set to OFF (HI).
Table 1. USB-MODEVM SW2 Settings
SW-2 Switch Number Label Switch Description
1 A0 USB-MODEVM EEPROM I
2
C Address A0ON: A0 = 0OFF: A0 = 12 A1 USB-MODEVM EEPROM I
2
C Address A1ON: A1 = 0OFF: A1 = 13 A2 USB-MODEVM EEPROM I
2
C Address A2ON: A2 = 0OFF: A2 = 14 USB I
2
S™ I
2
S Bus Source SelectionON: I
2
S Bus connects to TAS1020OFF: I
2
S Bus connects to USB-MODEVM J145 USB MCK I
2
S Bus MCLK Source SelectionON: MCLK connects to TAS1020OFF: MCLK connects to USB-MODEVM J146 USB SPI SPI Bus Source SelectionON: SPI Bus connects to TAS1020OFF: SPI Bus connects to USB-MODEVM J157 USB RST RST Source SelectionON: EVM Reset Signal comes from TAS1020OFF: EVM Reset Signal comes from USB-MODEVM J158 EXT MCK External MCLK SelectionON: MCLK Signal is provided from USB-MODEVM J10OFF: MCLK Signal comes from either selection of SW2-5
Table 2 provides a list of jumpers found on the EVM and their factory default conditions.
Table 2. List of Stand-alone JumpersJumper Jumper DefaultNumber Type Position Jumper Description
W1 2-pin soldered AVDD_ADC power
W2 2-pin soldered DRVDD power (DRVDD1 on EVM).
W3 2-pin soldered DRVDD power (DRVDD2 on EVM).
W3 2-pin soldered AVDD_DAC power.
W5 2-pin soldered SPVDD power.
W7 2-pin soldered DVDD power.
W8 2-pin soldered IOVDD power.
W9 3-pin 2-3 Mic bias select. Connect 1-2 to use AIC3107 Mic Bias. Connect 2-3 to use EVM 3.3V Mic Bias.
W10 2-pin Open Connect EVM Onboard Mic to AIC3107 MIC3R input.
W11 2-pin Open Connect EVM Onboard Mic to AIC3107 MIC3L input.
W12 2-pin Open Enable 16-ohm load for HPL output test.
W13 2-pin Open Enable 16-ohm load for HPR output test.
W14 3-pin 1-2 IOVDD select. Connect 1-2 for IOVDD=+1.8V. Connect 2-3 for IOVDD=+3.3V.
W15 2-pin Open GPIO1 access point.
W16 2-pin Installed Software reset enable.
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2.3 Power Connections
2.3.1 Stand-Alone Operation
2.3.2 USB-MODEVM Operation
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Table 2. List of Stand-alone Jumpers (continued)Jumper Jumper DefaultNumber Type Position Jumper Description
W17 2-pin Open Selects onboard EEPROM as TAS1020B Firmware Source.(Not Used). Note that for this EVM the Firmware SourceEEPROM is on the USB-MODEVM.
W18 2-pin Open Selects SWOUTP to J-18. Caution: Make sure that the Class-D Output is Disabled before Installing W18.
W19 2-pin Open Selects SWOUTM to J-18. Caution: Make sure that the Class-D Output is Disabled before Installing W19.
Table 3. Switch SW1 ConfigurationsEVM Connector Terminal Number SW1 Switch Position = DIFF (Differential Inputs) SW1 Switch Position = SE = Single-EndedConnector (Terminal 2 is always Ground.) Inputs
J6 Terminal 1 Input to AIC3107-pin 4 = LINE1LP Input to AIC3107-pin 4 = LINE1LP
Terminal 3 Input to AIC3107-pin 3 = MICDET/ LINE1LM Input to AIC3107-pin 5 = LINE1RP
J7 Terminal 1 Input to AIC3107-pin 5 = LINE1RP Input to AIC3107-pin 9 = MIC3R/LINE2RM
Terminal 3 Input to AIC3107-pin 6 = MIC3L/ LINE1RM Input to AIC3107-pin 6 = MIC3L/LINE1RM
J8 Terminal 1 Input to AIC3107-pin 7 = LINE2LP Input to AIC3107-pin 7 = LINE2LP
Terminal 3 Input to AIC3107-pin 8 = LINE2RP/ LINE2LM Input to AIC3107-pin 8 = LINE2RP/LINE2LM
Table 4. Switch SW2 ConfigurationsSW2 Switch Position = CAP SW2 Switch Position = Capacitor-less
47- µF capacitors in-line with HPLOUT and HPROUT to J10 (Referenced to HPLOUT and HPROUT Direct Coupled to J10 (Referenced to HPCOM)Ground)
Table 5. Switch SW3 ConfigurationsSW3 Switch Position = EXT. SW3 Switch Position = +5VA
User Provides an External Power Supply for SVDD (Class-D Power Amplifier EVM 5-VDC Supply used for SVDD (Class-D Power Amplifier Supply)Supply), Max Value = 5 VDC
The TLV320AIC3107 can be powered independently when being used in stand-alone operation or by theUSB-MODEVM when it is plugged onto the motherboard.
When used as a stand-alone, power is applied to J15 directly; be sure to reference the supplies to theappropriate grounds on that connector.
CAUTION
Before applying power to the EVM, you must verify that all power supplies arewithin the safe operating limits as indicated in the TLV320AIC3107 data sheet .
J15 provides connection to the common power bus for the TLV320AIC3107EVM. Power is supplied on thepins listed in Table A-3 .
The TLV320AIC3107EVM-K motherboard (the USB-MODEVM Interface board) supplies power to J15 ofthe TLV320AIC3107EVM. Power for the motherboard is supplied either through its USB connection or viaterminal blocks on that board.
The USB-MODEVM Interface board can be powered from several different sources:•USB
•6-Vdc to 10-Vdc ac/dc external wall supply (not included)
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3 TLV320AIC3107EVM-K Setup and Installation
3.1 Software Installation
3.2 EVM Connections
www.ti.com TLV320AIC3107EVM-K Setup and Installation
•Laboratory power supply
When powered from the USB connection, JMP6 must have a shunt from pins 1–2 (this is the defaultfactory configuration). When powered from 6 Vdc-10 Vdc, either through the J8 terminal block or J9 barreljack, JMP6 must have a shunt installed on pins 2–3. If power is applied in any of these ways, onboardregulators generate the required supply voltages, and no further power supplies are necessary.
If laboratory supplies are used to provide the individual voltages required by the USB-MODEVM Interface,JMP6 must have no shunt installed. Voltages are then applied to J2 (+5VA), J3 (+5VD), J4 (+1.8VD), andJ5 (+3.3VD). The +1.8VD and +3.3VD can also be generated on the board by the onboard regulators fromthe +5VD supply; to enable this configuration, the switches on SW1 need to be set to enable theregulators by placing them in the ON position (lower position, looking at the board with text readingright-side up). If +1.8VD and +3.3VD are supplied externally, disable the onboard regulators by placingSW1 switches in the OFF position.
Each power supply voltage has an LED (D1-D7) that lights when the power supplies are active.
The following section provides information on using the TLV320AIC3107EVM-K, including set up, programinstallation, and program usage.
Note: If using the EVM in stand-alone mode, the software must be installed per the followinginstructions, but the hardware configuration may be different.
1. Locate the installation file on the CD-ROM included with the EVM or download the latest version of thesoftware located on the AIC3107 Product Page .2. Unzip the installation file by clicking on the self-extracting zip file.3. Install the EVM software by double-clicking the Setup executable and follow the directions. Users maybe prompted to restart their computers.
This installs all the TLV320AIC3107 software and required drivers onto the PC.
1. Ensure that the TLV320AIC3107EVM is installed on the USB-MODEVM Interface board, aligning J1,J2, J3, J4, and J5 with the corresponding connectors on the USB-MODEVM.2. Verify that the jumpers and switches are in their default conditions.3. Attach a USB cable from the PC to the USB-MODEVM Interface board. The default configurationprovides power, control signals, and streaming audio via the USB interface from the PC. On theUSB-MODEVM, LEDs D3-6 light to indicate the power is being supplied from the USB.4. For the first connection, the PC recognizes new hardware and begins an initialization process. Theuser may be prompted to identify the location of the drivers or allow the PC to automatically search forthem. Allow the automatic detection option.5. Once the PC confirms that the hardware is operational, D2 on the USB-MODEVM lights to indicate thatthe firmware has been loaded and the EVM is ready for use. If the LED is not lighted, verify that thedrivers were installed, try to unplug, and restart at Step 3.
After the TLV320AIC3107EVM-K software installation (described in Section 3.2 ) is complete, evaluationand development using the target TLV320AIC3107 can begin.
The TLV320AIC3107EVM software now can be launched. The user sees an initial screen that lookssimilar to Figure 4 .
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4 TLV320AIC3107EVM Software
4.1 Quick Start Tabs
4.1.1 Quick Start - USB-MODEM Configurations
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The following section discusses the details and operation of the EVM software.
Note: For configuration of the codec, the TLV320AIC3107 block diagram located in theTLV320AIC3107 data sheet is a good reference to help determine the signal routing. Apop-up detailed block diagram also is provided in the TLV320AIC3107 GUI software.
The Quick Start USB-MODEM Configurations tab and The Quick Start Preset Configurations tab Figure 3helps the user to begin using the GUI.
Figure 2. Quick Start - USB-MODEM Configurations
The default tab is the Quick Start - USB-MODEVM tab. This tab shows two common USB-MODEVMconfigurations used with the AIC3107EVM. The default configuration is the USB-MODEVM Audio InterfaceConfiguration. In this configuration, the USB-MODEVM acts as a USB sound card. Audio files can beplayed on the PC and targeted to the USB-MODEVM via the USB connection. On the USB-MODEVM, theTAS1020B converts the USB audio to I
2
S data and the I
2
C script data to I
2
C commands.
Note: For correct EVM operation, ensure that SW2 switch settings are as shown in Figure 2 .
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4.1.2 Quick Start - Preset Configurations
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Figure 3. Quick Start - Preset Configurations Tab
The Quick Start Preset Configurations tab provides several different preset configurations of the codec(Figure 3 ). The Preset Configurations buttons allow the user to choose from the provided defaults. Whenthe selection is made, the Preset Configuration Description shows a summary of the codec setupassociated with the choice made. If the choice is acceptable, the Load button can be pressed, and thepreset configuration is loaded into the codec. The user can change to the Command Line Interface tab(see Figure 30 ) to view the actual settings that were programmed into the codec. Note that the controls ofthe GUI are updated per any downloaded script whether it be a Preset Configuration script or a UserScript run form the Command Line Interface tab.
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4.2 Main Software Screen With Indicators and Functions
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Figure 4. Main Software Screen
Figure 4 illustrates the main screen of the EVM software. The indicators and buttons located above thetabbed section of the front page are visible regardless of which tab is currently being selected.
The firmware box indicates from where the firmware being used is operating. In this release, the firmwareis on the USB-MODEVM, so the user sees USB-MODEVM in the box labeled Located on:. The version ofthe firmware appears in the Version box below this.
To the right, the next group box contains controls for resetting the TLV320AIC3107EVM. A software resetcan be done by writing to a register in the TLV320AIC3107EVM; this is accomplished by clicking thebutton labeled Reset.
Near the Firmware box, the Device Connected LED is green when the EVM is connected. If the indicatoris red, the EVM is not properly connected to the PC. Disconnect the EVM, and verify that the drivers werecorrectly installed. Then reconnect, and try restarting the software.
On the upper right portion of the screen are located several indicators which provide the status of variousportions of the TLV320AIC3107. Pressing the Indicator Updates button activates these indicators. Theseindicators, as well as the other indicators on this panel, are updated only when the software's front panelis inactive, once every 20 ms.
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4.2.1 Detailed TLV320AIC3107 Block Diagram
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The ADC Overflow and DAC Overflow indicators illuminate when the overflow flags are set in theTLV320AIC3107. Below these indicators are the AGC Noise Threshold Exceeded indicators thatilluminate when the AGC noise threshold is exceeded. To the far right of the screen, the Short CircuitDetect indicators illuminate when a short-circuit condition is detected, if this feature has been enabled.Below the short-circuit indicators, the AGC Gain Applied indicators use a bar graph to show the amountof gain which has been applied by the AGC and indicators that illuminate when the AGC is saturated.
Figure 5.
To view the detailed block diagram, click on the "Show" button at the top left of the Main Software Screen(Figure 4 ). This block diagram shows the details of the processing blocks of the TLV320AIC3107 includingthe I
2
C registers associated with each block.
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4.3 Audio Input/ADC Tab
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Figure 6. Audio Input/ADC Tab
The Audio Input/ADC tab allows control of the analog input mixer and the ADC. The controls aredisplayed to look similar to an audio mixing console (see Figure 6 ). Each analog input channel has avertical strip that corresponds to that channel. By default, all inputs are muted when the TLV320AIC3107is powered up.
To route an analog input to the ADC:1. Select the Input Mode button to correctly show if the input signal is single-ended ( SE) orfully-differential ( Diff). Inputs that are single-ended must be made to the positive signal terminal.2. Click on the button of the analog input channel that corresponds to the correct ADC. The caption of thebutton changes to Active. Note that the user can connect some channels to both ADCs, whereasothers only connect to one ADC.3. Adjust the Level control to the desired attenuation for the connected channel. This level adjustmentcan be done independently for each connection.
The TLV320AIC3107 offers a programmable microphone bias that can either be powered down, set to 2V, 2.5 V, or the power supply voltage of the ADC (AVDD_ADC). Control of the microphone bias (mic bias)voltage is accomplished by using the Mic Bias pulldown menu button above the last two channel strips.To use the onboard microphone, hardware jumpers W10 and W11 must be installed. Nothing must beplugged into J9, in order for the mic bias settings in the software to take effect. Also, jumper W9 (Mic BiasSel) must be set to connect positions 2 and 3, so that MICBIAS is controlled by the TLV320AIC3107.
Also shown are controls for Weak Common Mode Bias. Enabling these controls results in unselectedinputs to the ADC channels to be weakly biased to the ADC common mode voltage.
Nearby are the controls for the ADC PGA, including the master volume controls for the ADC inputs. Eachchannel of the ADC can be powered up or down as needed using the Power Up buttons. PGAsoft-stepping for each channel is selected using the pulldown menu control. The two large knobs set theactual ADC PGA Gain and allow adjustment of the PGA gains from 0 dB to 59.5 dB in 0.5-dB steps(excluding Mute). At the extreme counterclockwise rotation, the channel is muted. Rotating the knobclockwise increases the PGA gain, which is displayed in the box directly above the volume control.
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4.4 Bypass Paths Tab
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Figure 7. Bypass Paths Tab
As shown in Figure 7 , several analog bypass paths are available in the TMS320AIC3107. LINE1RP,LINE2RP, LINE1LP, and LINE2LP inputs can be passively bypassed to either RIGHT_LOP or LEFT_LOPby using the Passive Analog Bypass Paths controls. LINE2L (left) and LINE2R (right) buffered inputscan directed to the output mixer sections by using the Active Bypass Paths to Output Amplifierscontrols.
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4.5 Audio Interface Tab
TLV320AIC3107EVM Software www.ti.com
Figure 8. Audio Interface Tab
The Audio Interface tab (Figure 8 ) allows configuration of the audio digital data interface to theTLV320AIC3107.
The interface mode can be selected using the Audio Serial Data Mode control—selecting either I
2
Smode, DSP mode, or Right- or Left-Justified modes. Word length can be selected using the Audio SerialWord Length control, and the bit clock rate can also be selected using the Bit Clock Mode rate control.The Audio Data Word Offset, used in TDM mode (see the product data sheet ) also can be selected onthis tab.
Along the bottom of this tab are controls for choosing the BLCK and WCLK as being either inputs oroutputs. With the codec configured in Slave mode, both the BCLK and WCLK are set to inputs. If thecodec is in Master mode, then BCLK and WCLK are configured as outputs. Additionally, two buttonsprovide the options for 3-stating the DOUT line when no valid data is available and for transmitting BLCKand WCLK when the codec is powered down.
Re-synchronization of the audio bus is enabled using the controls in the lower right corner of this screen.Re-synchronization is done if the group delay changes by more than ±FS/4 for the ADC or DAC samplerates (see the TLV320AIC3107 data sheet). The channels can be soft-muted when doing theRe-synchronization if the Soft Mute button is enabled.
The default mode for the EVM is configured as 44.1-kHz, 16-bit, I
2
C words, and the codec is a slave(BCLK and WCLK are supplied to the codec externally). For use with the PC software and theUSB-MODEVM, the default settings must be used; no changes to the software are required.
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4.6 Clocks Tab
4.6.1 Configuring the Codec Clocks and Fsref Calculation
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Figure 9. Clocks Tab
The TLV320AIC3107 provides a phase-locked loop (PLL) that allows flexibility in the clock generation forthe ADC and DAC sample rates. The Clocks tab contains the controls that can be used to configure theTLV320AIC3107 for operation with a wide range of master clocks. See the Audio Clock GenerationProcessing figure in the TLV320AIC3107 data sheet for further details of selecting the correct clocksettings.
For use with the PC software and the USB-MODEVM, the clock settings must be set a certain way. If thesettings are changed from the default settings which allow operation from the USB-MODEVM clockreference, the EVM settings can be restored automatically by clicking the Load EVM USB Settingsbutton. Note that changing any of the clock settings from the values loaded when this button is pushedcan result in the EVM not working properly with the PC software or USB interface. If an external audio busis used (audio not driven over the USB bus), then settings can be changed to any valid combination. SeeFigure 9 .
The codec clock source is chosen by the CODEC_CLK Source control. When this control is set toCLKDIV_OUT, the PLL is not used; when set to PLLDIV_OUT, the PLL is used to generate the clocks.
Note: Per the TLV320AIC3107 data sheet, the codec must be configured to allow the value ofFsref to fall between the values of 39 kHz to 53 kHz.
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4.6.1.1 Use Without PLL
4.6.1.2 Use With PLL
4.6.1.3 Setting ADC and DAC Sampling Rates
TLV320AIC3107EVM Software www.ti.com
Setting up the TLV320AIC3107 for clocking without using the PLL permits the lowest power consumptionby the codec. The CLKDIV_IN source can be selected as either MCLK (default) or BCLK. The CLKDIV_INfrequency then is entered into the CLKDIV_IN box, in megahertz (MHz). The default value shown,11.2896 MHz, is the frequency used on the USB-MODEVM board. This value then is divided by the valueof Q, which can be set from 2 to 17; the resulting CLKDIV_OUT frequency is shown in the indicator nextto the Qcontrol. The result frequency is shown as the Actual Fsref.
When PLLDIV_OUT is selected as the codec clock source, the PLL is used. The PLL clock source ischosen using the PLLCLK_IN control, and can be set to either MCLK or BCLK. The PLLCLK_INfrequency then is entered into the PLLCLK_IN Source box.
The PLL_OUT and PLLDIV_OUT indicators show the resulting PLL output frequencies with the values setfor the P, K, and R parameters of the PLL. See the TLV320AIC3107 data sheet for an explanation ofthese parameters. The parameters can be set by clicking on the up/down arrows of the P,K, and Rcombination boxes, or they can be typed into these boxes.
Use the Search for PLL Settings Based on Desired Fsref and PLLCLK_IN section to find the idealvalues of P, K, and R for a given PLL input frequency and desired Fsref:1. Set the desired Fsref using the Fsref switch.2. Verify that the correct reference frequency is entered into the PLLCLK_IN Source box in megahertz(MHz)
3. Push the Search for Ideal PLL Settings button. The software starts searching for ideal combinationsof P, K, and R, which achieve the desired Fsref. The possible settings for these parameters aredisplayed in the spreadsheet-like table labeled Possible Settings.4. Click on a row in this table to select the P, K, and R values located in that row. Notice that when this isdone, the software updates the P, K, R, PLL_OUT and PLLDIV_OUT readings, as well as the ActualFsref and Error displays. The values show the calculations based on the values that were selected.This process does not actually load the values into the TLV320AIC3107, however; it only updates thedisplays in the software. If more than one row exists, the user can choose the other rows to see whichof the possible settings comes closest to the ideal settings.
When a suitable combination of P, K, and R has been chosen, pressing the Load Settings into Device?button downloads these values into the appropriate registers on the TLV320AIC3107.
The Fsref frequency that determines either enabling or bypassing the PLL (see Section 4.6.1.1 orSection 4.6.1.2 ) is used to determine the actual ADC and DAC sampling rates. By using the NADC andNDAC factors, the sampling rates are derived from the Fsref. If the dual-rate mode is desired, this optioncan be enabled for either the ADC or DAC by pressing the corresponding Dual Rate Mode button. TheADC and DAC sampling rates are shown in the box to the right of each control.
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4.7 GPIO1 Tab
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Figure 10. GPIO1 Tab
The GPIO1 tab (see Figure 10 ) selects options for the general-purpose inputs and outputs (GPIO) of theTLV320AIC3107.
The GPIO1 groupbox contains controls for setting options for the GPIO1 pin. The Function control selectsthe function of GPIO1 from the following:•ADC Word Clock•An output clock derived from the reference clock (see TLV320AIC3107 data sheet)•Interrupt output pin to signal:– Short Circuit– AGC Noise Threshold detection– Jack/Headset detection•For use as an interrupt output, the behavior of the interrupt can be selected using the InterruptDuration control. A Single, 2ms pulse can be delivered when the selected interrupt occurs, orContinuous Pulses can be generated signaling the interrupt.•Alternate I
2
S Word Clock•A general-purpose I/O pin– If selected as a General Purpose Input, the state of the GPIO1 pin is reflected by the Input Levelindicator. If selected as a General Purpose Output, the state of the GPIO1 pin can be set by usingthe Output Level button.
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4.8 AGC Tab
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Figure 11. AGC Tab
The AGC tab (see Figure 11 ) consists of two identical sets of controls, one for the left channel and theother for the right channel. The AGC function is described in the TLV320AIC3107 data sheet.
The AGC can be enabled for each channel using the Enable AGC button. Target gain, Attack time inmilliseconds, Decay time in milliseconds, and the Maximum PGA Gain Allowed can all be set,respectively, using the four corresponding knobs in each channel.
The TLV320AIC3107 allows for the Attack and Decay times of the AGC to be setup in two differentmodes, standard and advanced. The Left/Right AGC Settings button determines the mode selection.The Standard mode provides several preset times that can be selected by adjustments made to theAttackand Decay knobs. If finer control over the times is required, then the Advanced mode is selected tochange to the settings. When the Advanced mode is enabled, two tabs appear that allow separate,advanced control of the Attack and Delay times of the AGC (see Figure 12 and Figure 13 ). These optionsallow selection of the base time as well as a multiplier to achieve the actual times shown in thecorresponding text box. The Use advanced settings? button must be enabled to program the registerswith the correct values selected via the pulldown options for base time and multiplier.
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Figure 12. Left AGC Settings
Figure 13. Advanced
Noise gate functions, such as Hysteresis,Enable Clip stepping,Threshold (dB),Signal DetectDebounce (ms), and Noise Detect Debounce (ms) are set using the corresponding controls in theNoise Gate groupbox for each channel.
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4.9 Filters Tab
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Figure 14. Filters Tab
The TLV320AIC3107 has an advanced feature set for applying digital filtering to audio signals. This tabcontrols all of the filter features of the TLV320AIC3107. In order to use this tab and have plotting of filterresponses correct, the DAC sample rate must be set correctly. Therefore, the clocks must be set upcorrectly in the software following the discussion in Section 4.6 . See Figure 14 .
The AIC3107 digital filtering is available to both the ADC and DAC. The ADC has optional high-pass (HP)filtering and allows the digital output from the ADC through digital effects filtering before exiting the codecthrough the PCM interface. Likewise, the digital audio data can be routed through the digital effectsfiltering before passing through the optional de-emphasis filter before the DAC. The digital effects filteringcan only be connected to either the ADC or DAC, not both at the same time.
The Figure 14 is divided into several areas. The left side of the tab, is used to select between the DAC orADC filters and to assist in the selection and calculating of the desired filter coefficients. The right side ofthe tab shows a frequency response plot of the digital effects filter selected and the coefficients that areprogrammed into the device. The plots show the magnitude and phase response of each biquad section,plus the combined responses of the two biquad filters. Note that the plot shows only the responses of theeffect filters, not the combined response of those filter along with the de-emphasis and ADC high-passfilters.
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