Texas Instruments TLV320AIC26EVM, User Manual

Page 1: ...TLV320AIC26EVM Audio Codec Evaluation Module March 2004 Data Acquisition Products User s Guide SLAU128 ...

Page 2: ...tute a license from TI to use such products or services or a warranty or endorsement thereof Use of such information may require a license from a third party under the patents or other intellectual property of the third party or a license from TI under the patents or other intellectual property of TI Reproduction of information in TI data books or data sheets is permissible only if reproduction is...

Page 3: ... handling or use of the goods Please be aware that the products received may not be regulatory compliant or agency certified FCC UL CE etc Due to the open construction of the product it is the user s responsibility to take any and all appropriate precautions with regard to electrostatic discharge EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR A...

Page 4: ...to the EVM output If there is uncertainty as to the load specification please contact a TI field representative During normal operation some circuit components may have case temperatures greater than 40 C The EVM is designed to operate properly with certain components above 40 C as long as the input and output ranges are maintained These components include but are not limited to linear regulators ...

Page 5: ...roductory chapter that describes the EVM and what it can do If you are anxious to setup the EVM and start testing we sug gest you read at least the first two chapters These two chapters introduce you to the board and how to set it up Later chapters go into more detail on the board s design and how to access its many features Information About Cautions and Warnings This document may contain caution...

Page 6: ...about this or other Texas Instruments data converter evaluation modules feel free to e mail the data converter application team at dataconvapps list ti com Include the product name in the subject heading FCC Warning This equipment is intended for use in a laboratory test environment only It generates uses and can radiate radio frequency energy and has not been tested for compliance with the limits...

Page 7: ...elect 3 2 3 1 4 Power Supply Selection 3 2 3 1 5 Power Supply Current Measurement 3 3 3 1 6 IOVDD Voltage Selection 3 3 3 2 Switches 3 3 3 2 1 SPI Selection 3 3 3 2 2 I2S Selection 3 4 3 2 3 MCLK Selection 3 4 3 2 4 USB Reset 3 4 3 3 I O Connector and Signals 3 5 3 3 1 Audio Connectors 3 5 3 3 2 USB Interface Connector 3 5 3 3 3 External Power Connectors 3 6 3 3 4 External Audio Data I2S Connector...

Page 8: ...3 10 3 2 Data Acquisition Screen With Audio Registers Reading 3 11 3 3 Data Acquisition Screen With Boost Filter Parameters 3 12 3 4 Configuration Screen 3 13 3 5 Configuration Screen With External Reference Selection 3 14 3 6 Audio Screen 3 16 3 7 Audio Screen With AGC On 3 18 3 8 Audio Effects Filter Screen 3 20 Tables 2 1 Default Configuration Settings 2 2 3 1 Jumper Function Reference 3 2 3 2 ...

Page 9: ...t processor to control the AIC26 and the audio data is communicated to the AIC26 over the I2S bus The AIC26 accesses both of these buses through the use of a USB microcontroller which provides a way to generate data for both buses from a PC running Windowsr 98 Windows 2000 or Windows XP Topic Page 1 1 Device Characteristics 1 2 1 2 EVM Block Diagram 1 2 1 3 Analog Inputs Outputs 1 3 1 4 External V...

Page 10: ... 1 2 EVM Block Diagram A block diagram of the AIC26 evaluation kit is shown in Figure 1 1 Figure 1 1 AIC26 Evaluation Kit Block Diagram TAS1020B MCU and USB Controller J10 4 5 3 3 3 V VREG 1 2 J11 12 11 I2S AUDIO 1 2 J12 12 11 EXT SPI USB J9 6 12 VDC SPI I2S AUDIO ANALOG J6 HEADPHONE OUT J7 OUT J5 MIC IN VB1 VB2 AUX GND J3 AIC26 MICIN On Board MK1 2 I2C EEPROM Store Firmware for TAS1020B 6 10 VDC ...

Page 11: ...nal Voltage Reference If the external voltage reference is used the reference can be input to the AIC26 device through the J4 terminal block The reference internal or external is needed for the AUX BAT1 or BAT2 ADC measurement 1 5 Power Requirements The AIC26EVM can be powered from either the USB port or an external 6 VDC to 10 VDC power supply 1 6 Computer Requirements The AIC26EVM software is de...

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Page 13: ...tting Started This chapter guides you through unpacking your EVM and setting it up so you can begin working with it immediately Topic Page 2 1 Unpacking the EVM 2 2 2 2 Default Configuration 2 2 2 3 Quick Start 2 2 Chapter 2 ...

Page 14: ...1 ON TAS1020B enable On board MCLK SW1_2 ON On board SPI SW1_3 ON USB Reset SW1_4 ON NOTE JMP5 through JMP8 are installed by default These jumpers can be removed and replaced by current meters for evaluating or testing the corresponding power consumption 2 3 Quick Start Once the AIC26EVM has been unpacked and you have verified that the board is configured as shown in Table 2 1 install the software...

Page 15: ...Quick Start 2 3 Getting Started Figure 2 1 Default Software Screen ...

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Page 17: ... function of the AIC26 evaluation kit and how to use the accompanying software to control and use the AIC26 Topic Page 3 1 Jumpers 3 2 3 2 Switches 3 3 3 3 I O Connectors and Signals 3 5 3 4 Circuit Description 3 7 3 5 Program Description 3 9 Chapter 3 ...

Page 18: ... the AIC26 through J5 and to the AIC26 MICIN and AUX pins In differential mode JMP1 should be installed 3 1 2 MIC BIAS Selection JMP2 selects the microphone bias to come from the AIC26 itself or from an external resistor R11 which is not installed on the AIC26EVM board If an external bias is needed the appropriate size resistor can be soldered into the R11 location on the board and JMP2 set to con...

Page 19: ... gives users the option to select SPI and I2S as well as MCLK signal resources Table 3 2 shows the function of the switch Table 3 2 Switch Function Reference Reference Designator Setting Function Factory Default Subsection ON On board I2S selected SW1 1 OFF External I2S selected ON 3 2 2 ON On board MCLK selected SW1 2 OFF External MCLK selected ON 3 2 3 SW1 ON On board SPI selected SW1 3 OFF Exte...

Page 20: ...an communicate with the AIC26 I2S port 3 2 3 MCLK Selection The AIC26 requires a proper MCLK for basic audio ADC DAC functions The TAS1020B onboard processor generates an 11 2896 MHz frequency to provide the MCLK If an external MCLK is preferred SW1 2 should be turned off 3 2 4 USB Reset A reset signal output from the onboard TAS1020B processor can be used to reset the the AIC26 whenever the TAS10...

Page 21: ...put sleeve ground J6 Headphone Out Stereo headphone audio outputs tip left channel ring right channel sleeve virtual ground J7 Line Out Stereo headphone output with ac coupling tip left channel ring right channel sleeve ground J13 Loudspeaker When the AIC26 output drive is in high power mode an 8 Ω loudspeaker can be connected to J13 3 3 2 USB Interface Connector Connection to a USB cable from a P...

Page 22: ...ard TAS1020B is disabled Table 3 6 Audio Data Connector Reference Designator Description Pin Number Signal Name 1 MCLK 3 BCLK 5 LRCLK J11 Audio data I2S connector 7 I2SDIN J11 Audio data I S connector 9 I2SDOUT 11 PWD AWDS 2 4 6 8 10 12 Ground 3 3 5 External SPI Connector The AIC26 SPI port is brought out to the J12 header It can be driven by an external source if the onboard microprocessor is dis...

Page 23: ...eader J12 or through the onboard microprocessor U5 via USB The U5 outputs are enabled only when the supplied firmware is loaded and the TAS SPI switch SW1 3 is turned on The firmware resides in the serial EEPROM chip U2 U5 only loads firmware from U2 when U2 s A1 address line is pulled low To disable firmware loading A1 must be high by having JM3 removed When the firmware is loaded and active D2 a...

Page 24: ...and auxiliary inputs Battery inputs can range from 0 V to 6 V and the auxiliary input can range from 0 V to Vreg Each of these three inputs to the AIC26 internal ADC circuitry has a provision for an RC filter to be placed in line with the signal As shipped all of the resistors are 0 Ω and the capacitor is not installed If noisy conditions prevent obtaining good readings from the AIC26 0 01 µF to 0...

Page 25: ...tarting from the left the first section shows the status of the connection if an error in communication occurs an error message appears here otherwise it looks as shown in Figure 2 1 The final section on the right side of the status bar shows the number of readings per second When on this screen the AIC26 is commanded to perform the battery and aux iliary input voltage readings and then it is comm...

Page 26: ...Program Description 3 10 Figure 3 1 Data Acquisition Screen With ADC Registers Reading ...

Page 27: ...Program Description 3 11 Operation Figure 3 2 Data Acquisition Screen with Audio Registers Reading ...

Page 28: ...Program Description 3 12 Figure 3 3 Data Acquisition Screen With Boost Filter Parameters ...

Page 29: ...Section This section controls all of the parameters of the A D converter Each slider controls one parameter whose value is shown next to the slider Each slider is described below J Resolution Selects between 8 10 and 12 bit resolution J Conversion Clock The internal clock which runs the A D converter can run at 8 4 2 or 1 MHz When running at 8 MHz only 8 bit resolution is possible when running at ...

Page 30: ... can be set to either 1 25 V or 2 5 V The internal reference powers down between conversions to save power Us ing the Powered at all times checkbox this can be overridden and the refer ence does not power down If the reference is allowed to power down the AIC26 then must allow a delay time for the reference to power up when a con version is to take place This delay time can be set using the slider...

Page 31: ...nd the codec sample rate is also fixed at 44 1 kHz So no PLL is necessary With the AIC26EVM changing the PLL setting may cause audio distortions 3 5 2 4 Reinitialization and Reset There are two buttons on this screen that allow the user to reset and reinitialize the AIC26 by clicking these buttons By clicking the button SW Reset a software reset is issued By clicking the button Init AIC26 the cont...

Page 32: ...iption 3 16 3 5 3 Audio Screen The audio functions of the AIC26 can be accessed using the Audio screen besides the programmable PLL which is on the configuration screen as shown in Figure 3 6 Figure 3 6 Audio Screen ...

Page 33: ...o be generated by the AIC26 refer to Figure 3 6 Note that to use the microphone bias voltage jumper JMP2 should be set to position 2 to 3 refer to Table 3 1 of this document for jumper settings If the differential microphone inputs to the EVM through the microphone jack J5 the JMP1 should be installed and the input select should be set to DIFF MIC AUX in this section In the ADC input path there is...

Page 34: ...be powered down before power up The stereo audio volumes can be controlled by the left L and right R volume control slides in three different ways selectable through setting the master volume controller 1 independent 2 right channel controlled or 3 left channel controlled Like the audio ADC s gain controls the DAC s PGA gain can be changed in soft stepping either 0 5 dB per one sample or 0 5 dB pe...

Page 35: ...ed when the Mute box under the slider is checked Additionally similar to the audio ADC and DAC the analog sidetone volume change can be in soft stepping mode if the corresponding box is checked The AIC26 s digital sidetone has three settings The volume is controlled by the digital slider which changes from 0 dB to 48 dB in steps of 1 5 dB The digital sidetone can be muted by checking the mute box ...

Page 36: ... by pressing the View Response button It is recommended that you view the response before downloading values to the AIC26 as some values can cause clipping or oscillation of the filter The filter equation is described in the AIC26 data sheet Checking the Boost Filter On box enables the filter There is another digital filter the de emphasis filter provided by the AIC26 for the audio DAC Checking th...

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Page 38: ...al Description Physical Description This chapter contains the component locations bill of materials and the schematics Topic Page 4 1 Component Locations 4 2 4 2 Bill of Materials 4 3 4 3 Schematics 4 6 Chapter 4 ...

Page 39: ...Component Locations 4 2 4 1 Component Locations ...

Page 40: ...ic ERJ 3GEYJ272V 12 4 3 09 K R15 R16 R17 R18 1 16W 1 Chip resistor Panasonic ERJ 3EKF3091V 13 3 100 K R8 R9 R10 R25 1 16W 5 Chip resistor Panasonic ERJ 3GEYJ104V Not Installed 1 R11 1 10W 5 Chip resistor Panasonic 14 1 10 K RA1 1 8W Quad Isolated resistor array CTS Corporation 744C083103JTR 15 2 33 pF C32 C33 50 V Ceramic chip capacitor 5 NPO Panasonic ECJ 1VC1H330J 16 2 47 pF C30 C31 50 V Ceramic...

Page 41: ...Microphone Cartridge Knowles Acoustics MD9745APZ F 30 1 X1 6 MHz Crystal SMD Epson MA 505 6 000M C0 31 1 U1 Stereo audio CODEC Texas Instruments TLV320AIC26IRHB 32 1 U5 USB streaming controller Texas Instruments TAS1020BPFB 33 1 U6 3 3 V 1 8 V dual output LDO regulator Texas Instruments TPS767D318PWP 34 2 U3 U4 Quad 3 state buffers Texas Instruments SN74LVC125APW 35 3 U7 U8 U9 Single IC buffer dri...

Page 42: ...UI Stack SJ 3515 SMT 1 46 2 J11 J12 12 Pin double row header 2x6 0 1 Samtec TSW 106 07 L D 47 2 JMP1 JMP3 2 Position Jumper 0 1 spacing Samtec TSW 102 07 L S 48 3 JMP2 JMP4 JMP9 3 Position Jumper 0 1 spacing Samtec TSW 103 07 L S 49 4 JMP5 JMP6 JMP7 JMP8 Bus wire 50 1 SW1 SMT Half pitch 4 position switch C K Division ITT TDA04H0SK1 51 5 N A Jumper plug Samtec SNT 100 BK T 52 4 N A 0 25 x 0 625 Hex...

Page 43: ...Schematics 4 6 4 3 Schematics Schematic diagrams of the AIC26EVM showing the AIC26 connections and the USB and connectors are shown on the following pages ...

Page 44: ...2 3 4 J1 ED555 4DS TOUCH SCREEN TOUCH SCREEN EXTERNAL INPUTS EXT MIC IN HEADPHONE OUT LINE OUT MICROPHONE X Y X Y X Y X Y 6444323 1 2 J4 ED555 2DS EXTERNAL VREF C10 0 1uF C12 0 1uF C8 0 1uF C9 0 1uF PWD ADWS C11 0 1uF 1 2 JMP1 DIFF MIC INPUT C22 47uF R12 0 C23 NI TP7 PENIRQ TP6 RESET TP5 PWDN AWDS TP8 MICIN TP9 HPR TP10 HPL TP11 VGND IOVDD 2 X 19 Y 18 X 17 Y 16 VGND 23 VBAT1 13 VBAT2 12 AUX 11 VRE...

Page 45: ... 27 4 R21 27 4 C30 47pF C31 47pF 1 2 3 JMP4 PWR SELECT C34 100pF C35 001uF R18 3 09K X1 MA 505 6 000M C0 C32 33pF C33 33pF 3 3V VCC 8 VSS 4 SDA 5 SCL 6 A0 1 A1 2 A2 3 WP 7 U2 24LC64I SN 3 3V C26 1uF TP2 TP3 R16 3 09K R17 3 09K 3 3V MCLK BCLK LRCLK I2SDIN I2SDOUT PENIRQ MISO MOSI SS SCLK R22 649 3 3V 1 2 JMP3 A1 SELECT R15 3 09K 1GND 3 1EN 4 1IN 5 1IN 6 2GND 9 2EN 10 2IN 11 2IN 12 2OUT 17 2OUT 18 2...

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