Texas Instruments TLV320AIC26EVM User Manual
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Texas Instruments TLV320AIC26EVM User Manual

Texas Instruments TLV320AIC26EVM User Manual

Audio codec evaluation module
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TLV320AIC26EVM
Audio Codec Evaluation Module
User's Guide
March 2004
Data Acquisition Products
SLAU128

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Summary of Contents for Texas Instruments TLV320AIC26EVM

  • Page 1 TLV320AIC26EVM Audio Codec Evaluation Module User’s Guide March 2004 Data Acquisition Products SLAU128...
  • Page 2 TI product or service and is an unfair and deceptive business practice. TI is not responsible or liable for any such statements. Following are URLs where you can obtain information on other Texas Instruments products and application solutions:...
  • Page 3 EVM IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety measures typically found in the end product incorporating the goods.
  • Page 4 EVM schematic located in the EVM User’s Guide. When placing measurement probes near these devices during operation, please be aware that these devices may be very warm to the touch. Mailing Address: Texas Instruments Post Office Box 655303 Dallas, Texas 75265 Copyright  2004, Texas Instruments Incorporated...
  • Page 5 How to Use This Manual Preface Read This First About This Manual This users guide describes the function and operation of the TLV320AIC26, or simply AIC26, audio codec evaluation module. This manual will help you quickly set up the evaluation board and its accompanying software, so that you can rapidly test and evaluate the AIC26.
  • Page 6 SN74LVC125A SCAS290M If You Need Assistance If you have questions 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.

  • Page 7: Table Of Contents

    Contents Contents Introduction ..............Device Characteristics .
  • Page 8 Contents Program Description ............3.5.1 Data Acquisition Screen .

  • Page 9: Introduction

    Chapter 1 Introduction The AIC26 is a low power high performance audio codec with mono input and stereo output. There are two digital interface buses on the AIC26 that commu- nicate with a host processor: the SPI interface and the I S interface.

  • Page 10: Device Characteristics

    Device Characteristics 1.1 Device Characteristics The AIC26 is an audio codec with headphone/speaker amplifier and a 12-bit battery/temperature/auxiliary measurement ADC. The AIC26 has audio playback and record capabilities. Access to the audio DAC and ADC sections of the AIC26 is through an I S interface.

  • Page 11: Analog Inputs/Outputs

    Analog Inputs/Outputs 1.3 Analog Inputs/Outputs The audio signal comes from either the on-board microphone MK1 or an external microphone, connected to J5. The audio output is accessed through connectors J6, J7, and/or terminal block J13. The other analog inputs are brought onto the board through the J3 terminal block.
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  • Page 13: Getting Started

    Chapter 2 Getting Started This chapter guides you through unpacking your EVM and setting it up so you can begin working with it immediately. Topic Page Unpacking the EVM ......... . . Default Configuration .

  • Page 14: Unpacking The Evm

    The EVM kit should include the following: AIC26EVM board, PWB 6444324 CD-ROM, 6460667 If any of these components is missing, contact Texas Instruments for a replacement. 2.2 Default Configuration The AIC26EVM features a few simple means of configuring its operation. The default settings for these items are shown in Table 2−1.

  • Page 15: Default Software Screen

    Quick Start Figure 2−1. Default Software Screen Getting Started...
  • Page 16 THIS PAGE INTENTIONALLY LEFT BLANK...

  • Page 17: Operation

    Chapter 3 Operation This chapter describes each function of the AIC26 evaluation kit and how to use the accompanying software to control and use the AIC26. Topic Page Jumpers ........... . . Switches .

  • Page 18: Jumpers

    Jumpers 3.1 Jumpers Table 3−1 shows the function of each jumper on the EVM. Table 3−1. Jumper/Function Reference Reference Setting Function Factory Default Subsection Designator Differential (MICIN and AUX) microphone JMP1 1 to 2 Not installed 3.1.1 input 1 to 2 MIC BIAS from fixed resistor JMP2 2 to 3...

  • Page 19: Power Supply Current Measurement

    Switches 3.1.5 Power Supply Current Measurement Four jumpers are on the front of the four power supply pins of the AIC26. The jumpers can be replaced by current meters that measure and monitor the currents in the corresponding power supply pins. Refer to Table 2−1 note. 3.1.6 IOVDD Voltage Selection One of the features of the AIC26 is that the digital IO power supply is flexible...

  • Page 20: I 2 S Selection

    Switches 3.2.2 S Selection The I S bus on the AIC26 can interface with the onboard host processor, the TAS1020B USB controller, or with other offboard external I S processor or devices. When SW1-1 is set ON, the manufacture default, the AIC26 I S is connected to the TAS1020B’s I S.

  • Page 21: I/O Connector And Signals

    I/O Connector and Signals 3.3 I/O Connector and Signals The various connectors on the AIC26EVM are described in this section. 3.3.1 Audio Connectors The AIC26 audio inputs and outputs are routed through these stereo (TIP/RING/SLEEVE) 3.5-mm jacks. Note the polarity of the channel assignments for these connectors.

  • Page 22: External Power Connectors

    I/O Connector and Signals 3.3.3 External Power Connectors While it is most convenient to power the AIC26EVM from the USB bus, external power supplies can be used. The two connectors detailed in Table 3−5 are provided for the external power. Table 3−5.

  • Page 23: Analog Input Connector

    Circuit Description 3.3.6 Analog Input Connector The auxiliary and battery inputs to the touch screen controller are brought onto the EVM board through terminal block J3. The pinout is shown in Table 3−8. Table 3−8. Analog Input Connector Reference Signal Description Function Designator...

  • Page 24: Power Supply

    Circuit Description Do not drive the external I S bus when the firmware is loaded and the onboard microprocessor is active. Disable the micro- processor by removing JMP3, turn off SW1-1 and SW1-2, and cycle power to the AIC26EVM in order to use the external I S bus.

  • Page 25: Program Description

    Program Description output high power mode (refer to the data sheet) an 8-Ω loudspeaker can be connected to the terminal block J13. Another audio output jack (J7) is parallel to J6 and provides a secondary connection to the AIC26 built-in headphone amplifier (with ac coupling). 3.5 Program Description After installing the software for the AIC26EVM as described in Section 2.3, you may begin using it to evaluate and develop with the AIC26.

  • Page 26: Data Acquisition Screen With Adc Registers Reading

    Program Description Figure 3−1. Data Acquisition Screen With ADC Registers Reading 3-10...

  • Page 27: Data Acquisition Screen With Audio Registers Reading

    Program Description Figure 3−2. Data Acquisition Screen with Audio Registers Reading Operation 3-11...

  • Page 28: Data Acquisition Screen With Boost Filter Parameters

    Program Description Figure 3−3. Data Acquisition Screen With Boost Filter Parameters 3-12...
  • Page 29 Program Description 3.5.2 Configuration Screen This screen provides access to all of the configurable settings for the AIC26’s A/D converter and reference, as shown in Figure 3−4. Located on the right hand side of the screen are the programmable phase lock loop (PLL) settings, which are not the A/D settings but the audio settings.

  • Page 30: Configuration Screen

    Program Description Average/Median There are two ways to reduce noise effect to the ADC result. One is aver- aging where 2, 4, 8, or 16 readings are averaged, and another option is to find the median value among 5, 9, or 15 readings. 3.5.2.2 Reference Section For all nonaudio A/D functions, a reference voltage is needed for the A/D con-...
  • Page 31 Program Description 3.5.2.3 Audio PLL Section On the audio codec part of the AIC26, there is an on-chip phase-lock-loop (PLL). The PLL can be enabled or disabled, based on the given master clock (MCLK) to the AIC26 and the required reference frequency (FSref) for the codec.

  • Page 32: Audio Screen

    Program Description 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 3-16...
  • Page 33 Program Description 3.5.3.1 Codec Section By checking Power Up Codec in the codec section, the audio codec is powered In this EVM, the audio codec samples at 44.1 kHz in 16-bit I S mode. Also, the AIC26 codec functions as a slave in the interface. Although the AIC26 device has much more flexibility, this EVM has these values fixed.

  • Page 34: Audio Screen With Agc On

    Program Description Figure 3−7. Audio Screen With AGC On 3.5.3.3 DAC Section Like the ADC section, the AIC26 audio DAC can be powered on or off. By default, the DAC is powered off. Before a DAC power on, make sure to check the DAC output mode on the EVM board.
  • Page 35 Program Description By checking the Headphone Amp Enable box, the amp is enabled, which can directly be connected to a 16-Ω load. Otherwise, the headphone driver is bypassed and the device can have a load of 10 kΩ. By checking the Power Up Virtual GND box, the virtual ground for the headphone output is powered up.

  • Page 36: Audio Effects Filter Screen

    Program Description Figure 3−8. Audio Effects Filter Screen Different filter coefficients can be loaded for left and right channels, though usually these are set the same. Six preconfigured filters are selectable using the drop-down list box of this screen. Selecting one of these updates the coefficients and causes the graph of the filter response to update.
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  • Page 38: Physical Description

    Chapter 4 Physical Description This chapter contains the component locations, bill of materials, and the schematics. Topic Page Component Locations ......... Bill of Materials .

  • Page 39: Component Locations

    Component Locations 4.1 Component Locations...

  • Page 40: Bill Of Materials

    Bill of Materials 4.2 Bill of Materials Item Value Ref Des Description Vendor Part number 1/10W 5% Chip resistor Panasonic ERJ−6GEY0R00V R4, R5, 1/10W 5% Chip resistor Panasonic ERJ−6GEY0R00V Installed R6, R7 1/4W 5% Chip resistor Panasonic ERJ−8GEY0R00V 1/16W 5% Chip resistor Panasonic ERJ−3GEYJ100V 27R4...
  • Page 41 Bill of Materials Item Value Ref Des Description Vendor Part number 10 µF C13, C14, 6.3 V Ceramic chip capacitor, Panasonic ECJ−3YB0J106K ±10%, X5R C15, C18, C19, C20, C21, C41 47 µF C16, C17, 6.3 V Ceramic chip capacitor, Panasonic ECJ−4YB0J476M ±20%, X5R 16 V Ceramic chip capacitor,...
  • Page 42 Bill of Materials Item Value Ref Des Description Vendor Part number 4 Position terminal block On Shore ED555/4DS Technology 4 Position terminal block On Shore ED555/4DS Installed Technology 2,5 mm Power connector CUI Stack PJ−102B J5, J6, J7 3,5 mm Stereo audio jack SMT CUI Stack SJ−3515−SMT−1 J11, J12...

  • Page 43: Schematics

    Schematics 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 Revision History ECN Number Approved D5 through D8 are not installed, but can be added for extra ESD protection, or for reducing touch panel noise. +3.3V +3.3V PLEASE NOTE: I2SDOUT Components within dashed JMP7 box are not included on the I2SDIN AIC26 version of the board.
  • Page 45 REVISION HISTORY ENGINEERING CHANGE NUMBER APPROVED IOVDD +3.3V MCLK I2SDIN 3.09K 3.09K +3.3V BCLK +3.3V USB MCK I2SDOUT LRCLK USB I2S USB I2S USB MCK SN74LVC125APW +3.3V USB SPI IOVDD USB RST 24LC64I/SN 2.7K TAS ENABLE 33pF 33pF AUDIO DATA SN74LVC1G07DBV IOVDD PWD/ADWS...
  • Page 46 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Texas Instruments TLV320AIC26EVM...

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