Texas Instruments TLV320DAC26EVM User Manual
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Texas Instruments TLV320DAC26EVM User Manual

Texas Instruments TLV320DAC26EVM User Manual

Dac evaluation module
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TLV320DAC26EVM
DAC Evaluation Module
User's Guide
June 2004
Data Acquisition Products
SLAU136

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Summary of Contents for Texas Instruments TLV320DAC26EVM

  • Page 1 TLV320DAC26EVM DAC Evaluation Module User’s Guide June 2004 Data Acquisition Products SLAU136...
  • 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 user’s guide describes the function and operation of the TLV320DAC26, or simply DAC26, audio codec evaluation module. The manual helps users to quickly set up the evaluation board and its accompanying software, so that they can rapidly test and evaluate the DAC26.
  • Page 6 SN74LVC125A SCAS290M If You Need Assistance If you have questions about this or other Texas Instruments data converter evaluation modules, send an e−mail to 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 Physical Description ............. Component Locations .

  • Page 9: Introduction

    Chapter 1 Introduction The DAC26 is a low-power, high-performance audio band DAC with dual or stereo output. The DAC26 has two digital interface buses that communicate with a host processor: the SPI interface and the I S interface. The SPI serial interface is for a host processor to control the DAC26, and the DAC data is communicated to the DAC26 over the I S bus.

  • Page 10: Device Characteristics

    Device Characteristics 1.1 Device Characteristics The DAC26 is an audio band DAC with headphone/speaker amplifier. The DAC26 has audio playback capability. Access to the audio DAC section of the DAC26 is through an I S interface. The DAC26 interfaces to the host controller through a standard SPI serial interface.

  • Page 11: Analog Outputs/Inputs

    Analog Outputs 1.3 Analog Outputs/Inputs The audio output is accessed through connectors J6, J7, and/or terminal block J13. To test the DAC26 sidetone function, the audio signal input can be from either the onboard microphone MKI or an external microphone connected to 1.4 Power Requirements The DAC26EVM can be powered from either the USB port or an external 6-VDC to 10-VDC power supply.
  • Page 12 THIS PAGE INTENTIONALLY LEFT BLANK...

  • Page 13: Getting Started

    Chapter 2 Getting Started This chapter provides guidance for unpacking the EVM and setting it up for im- mediate operation. Topic Page Unpacking the EVM ......... . . Default Configuration .

  • Page 14: Unpacking The Evm

    When unpacking the DAC26EVM, make sure that the EVM kit includes the following: DAC26EVM board, PWB 6444324 CD-ROM, 6463159 If any of these components is missing, contact Texas Instruments for a replacement. 2.2 Default Configuration The DAC26EVM features a few, simple means of configuring its operation.
  • Page 15 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 DAC26 evaluation kit and how to use the accompanying software to control and use the DAC26. 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 (for sidetone only) 1 to 2 MIC BIAS from fixed resistor JMP2...

  • 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 DAC26. The jumpers can be replaced by current meters that measure and monitor the currents in the corresponding power supply pins. See the note accompanying Table 2−1.

  • Page 20: Mclk Selection

    I/O Connector and Signals 3.2.3 MCLK Selection The DAC26 requires a proper MCLK for basic audio 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.

  • Page 21: Usb Interface Connector

    I/O Connector and Signals 3.3.2 USB Interface Connector Connection to a USB cable from a PC is made through J8, a standard USB type−B receptacle. Table 3−4. USB Interface Connector Reference Description Signal Name Function Designator Number + 5-V supply from USB D−...

  • Page 22: External Spi Connector

    Circuit Description 3.3.5 External SPI Connector The DAC26 SPI port is brought out to the J12 header. It can be driven by an external source if the onboard microprocessor is disabled. Table 3−7. External SPI Connector Reference Signal Description Function Designator Number Name...
  • Page 23 Circuit Description 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.

  • Page 24: Program Description

    Program Description 3.4.3 Analog Outputs The DAC26 has a built-in headphone amplifier. J6 is the jack for connection to the amplifier and for driving a 16-Ω load at over 25 mW. Also, under audio output high power mode (see the DAC26 data sheet) an 8-Ω loudspeaker can be connected to the terminal block J13.
  • Page 25 Program Description Figure 3−1. Register Reading Screen With Control Registers Reading Operation...
  • Page 26 Program Description Figure 3−2. Register Reading Screen With Boost Filter Parameters Two buttons on this screen allow users to reset and reinitialize the DAC26 by clicking them. By clicking the button SW Reset , a software reset is issued. By clicking the button Init DAC26 , the control registers (for ADC and audio) revert back to the start−up (firmware) default settings.
  • Page 27 Program Description 3.5.2 DAC Configuration Screen The audio DAC functions of the DAC26 can be accessed using the DAC Configuration screen as shown in Figure 3−3. Figure 3−3. DAC Configuration Screen 3.5.2.1 Audio PLL Section On the DAC26, there is an on-chip phase-locked loop (PLL). The PLL can be enabled or disabled, based on the given master clock (MCLK) to the DAC26 and the required reference frequency (FSref) for the codec.
  • Page 28 Program Description 3.5.2.2 Interface Section By checking Power Up Codec in the Interface section, the audio interface is powered up. In this EVM, the audio codec samples at 44.1 kHz in 16-bit I S mode. Also, the DAC26 codec functions as a slave in the interface. Although the DAC26 device has much more flexibility, this EVM has these values fixed.
  • Page 29 Program Description selected as input. Its volume can be adjusted by the analog volume control slider, ranging from 12 dB to −34.5 dB in 0.5-dB steps. The analog sidetone is muted when the Mute box under the slider is checked. Additionally, the analog sidetone volume change can be in soft−stepping mode if the corresponding box is checked.
  • Page 30 Program Description Figure 3−4. DAC Output 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.
  • Page 31 Chapter 4 Physical Description This chapter contains the component locations, bill of materials, and the schematics. Topic Page Component Locations ......... Bill of Materials .

  • Page 32: Component Locations

    Component Locations 4.1 Component Locations...

  • Page 33: Physical Description

    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 34 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, 47 µF C16, C17, 6.3 V Ceramic chip capacitor, Panasonic ECJ−4YB0J476M ±20%, X5R 16 V Ceramic chip capacitor, Panasonic ±10%, X7R...
  • Page 35 Bill of Materials Item Value Ref Des Description Vendor Part Number USB Type B slave connector Mill−Max 897−30−004−90−000000 thru−hole J9, J13 2 Position terminal block On Shore ED555/2DS Technology 2 Position terminal block On Shore ED555/2DS Installed Technology 4 Position terminal block On Shore ED555/4DS Technology...
  • Page 36 Schematics 4.3 Schematics Schematic diagrams of the DAC26EVM showing the DAC26 connections and the USB and connectors are shown on the following pages.
  • Page 37 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 and DAC26 versions LRCLK...
  • Page 38 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...

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