EVALUATION FIXTURE +VDD AVCC- AVCC+ 3.3V SW006 Format C

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EVALUATION FIXTURE +VDD AVCC- AVCC+ 3.3V SW006 Format C

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DEM-DAI1742
EVALUATION FIXTURE
+VDD
AVCC- AVCC+
3.3V SW006 Format Control Regulator
JUMPER Digital Audio Receiver (BUS) Select
Coax
SCKI CLKO LRCK DATA
PCM1742
L-Channel 2nd-Order OPA2134 R-Channel
External (CN004)
FEATURES
COMPLETE EVALUATION PLATFORM PCM1742 STEREO AUDIO ONBOARD LOW-PASS FILTERS LEFT RIGHT CHANNELS EASY CONFIGURATION USING ONBOARD SWITCHES JUMPERS 96kHz DIGITAL AUDIO RECEIVER ACCEPTS S/PDIF OPTICAL INPUTS DEMONSTRATION SOFTWARE PROGRAMMING PCM1742'S INTERNAL REGISTERS (REQUIRES RUNNING MICROSOFT WINDOWS® 3.1, CENTRONICS CONNECTOR INTERFACING PARALLEL PORT (REQUIRED DEMONSTRATION SOFTWARE)
POWER-SUPPLY REQUIREMENTS: +5V, +15V, -15V CONNECTOR OPTIONAL EXTERNAL +3.3V POWER SUPPLY
Windows registered trademark Microsoft Corp.
DESCRIPTION
DEM-DAI1742 complete evaluation platform PCM1742 24-bit, 192kHz stereo audio Digital-to-Analog Converter (DAC). necessary connectors circuitry provided interfacing audio test systems commercial audio equipment.
Copyright 2001, Texas Instruments Incorporated
SBAU034
Printed U.S.A. January, 2001
HARDWARE DESCRIPTION
POWER SUPPLIES DEM-DAI1742 evaluation fixture requires three power supplies operating PCM1742, digital support circuitry, low-pass filter amp. Standard banana jacks provided power-supply connections. Connector CN054 provides supply required VCC. used power analog sections PCM1742, well digital audio receiver (U002) associated logic (U003 U004). Connectors CN051 (AVCC+) CN053 (AVCC-) used power OPA2134 dual (U101) that performs output low-pass filter function. AVCC+ from +18V, while AVCC- from -18V. Ground connections made connectors CN052 CN055. Both connected ground plane DEMDAI1742 board. addition three required external power supplies, +3.3V supply required PCM1742. +3.3V supply typically derived from using onboard linear regulator, REG1117-3.3 (U051). jumper must installed CN057 connect regulator output PCM1742. connector (CN056) provided connection optional external +3.3V power supply. When using CN056, jumper CN057 must removed order disable regulator output. ANALOG OUTPUTS left right audio outputs available jacks CN104 CN105 respectively. outputs taken from low-pass filter, which gain low-pass filter configured cutoff frequencies: 54kHz 108kHz. Typically, 54kHz cutoff frequency used measurements. f-3dB 54kHz, jumpers JP101 through JP106 must installed. f-3dB 108kHz, jumpers JP101 through JP106 must removed. ZERO-FLAG OUTPUTS zero flags left right channels brought connector CN103. ZFGL zero flag left channel, while ZFGR zero flag right channel. Refer PCM1742 data sheet detailed information regarding zero-flag outputs. DIGITAL AUDIO INTERFACE digital audio receiver (U002) provided easy connection S/PDIF optical signal sources, including audio test systems (Audio Precision, Rhode Schwarz) commercial audio equipment players). receiver operate rates 96kHz with 24-bit audio data.
Switches SW001 through SW003 used receiver output data format, shown Table Table shows jumper configuration JP001 normal operation.
SW001 SW002 SW003 RECEIVER OUTPUT DATA FORMAT 16-Bit 18-Bit 24-Bit Left-Justified 24-Bit Right-Justified Standard) Right-Justified Standard)
TABLE Digital Audio Receiver Configuration.
16-BIT RIGHT JUSTIFIED FORMAT 18-BIT RIGHT JUSTIFIED FORMAT 24-BIT LEFT JUSTIFIED FORMAT
JP001 JUMPER CLKO SCLK (L.Just.) LRCK DATA
24-BIT FORMAT
NOTE: Install Jumper; Remove Jumper; Don't Care,
TABLE JP001 Jumper Configuration. Switch SW004 normally open, momentary-contact pushbutton switch used reset digital audio receiver when necessary. demonstration board also supports direct interfacing audio decoders signal processors connector CN004 (unpopulated). SCLK, BCK, LRCK, DATA available buffered U005. addition, (VCC) Ground available CN004. Switch SW005 used select between digital audio receiver connector CN004 source audio interface. Table shows available switch settings.
SW005 SETTING
SOURCE SELECTION Digital Audio Receiver (U002) Connector CN004 Buffer U005
TABLE III. Digital Audio Source Selection. DIP-SWITCH CONFIGURATION Switch SW006 utilized PCM1742. included future products that compatible with this demonstration board. switch elements must position PCM1742. PARALLEL PORT/HOST CONNECTOR evaluation fixture includes Centronics connector, CN003, thatis used connect parallel port alternative host controller. This connector utilized access serial control port PCM1742. serial control port used program PCM1742's internal registers. standard printer cable used connect CN003 evaluation fixture parallel port. port signals buffered using U006.
DEM-DAI1742
SBAU034
SCHEMATICS
Figures through provide schematics DEM-DAI1742.
FIGURE Low-Pass Filters.
FIGURE Power-Supply Connections.
DEM-DAI1742
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FIGURE DAC, Digital Audio Interface, Connections.
DEM-DAI1742
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FIGURE PCM1742 Daughter Card Schematic.
DEM-DAI1742
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LAYOUT
Figures through provide plots DEM-DAI1742.
FIGURE DEM-DAI/DAC Silk Screen (Top Side).
DEM-DAI1742
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FIGURE DEM-DAI/DAC Top-Side Layer.
FIGURE DEM-DAI/DAC Bottom-Side Layer.
DEM-DAI1742
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FIGURE PCM1742 Daughter Card Silk Screen (Top Side).
FIGURE PCM1742 Daughter Card Top-Side Layer.
FIGURE PCM1742 Daughter Card Bottom-Side Layer.
DEM-DAI1742
SBAU034
DEMONSTRATION SOFTWARE PCM1742
Software provided with DEM-DAI1742 allow programming PCM1742's internal registers. software will operate computers running Microsoft Windows 3.1/95/98. demo software requires that printer port connected CN003 DEM-DAI1742 using standard printer cable. INSTALLATION demo software distributed 3.5-inch floppy disk. There single folder disk, named "Dem1742". This folder contains application support files. install software your computer, first create folder your hard drive with appropriate name (e.g. Dem1742, Pcm1742, etc). Then open "Dem1742" folder installation floppy copy files folder that created your hard disk. Open configuration settings file named "Dem1742" with text editor, such Notepad WordPad. When file opened, find following line: PCMIFADR &h378 &h378 indicates printer port address that demo software will communicate with DEM-DAI1742. This address must &h378, &h278, &h3BC. Most &H378 default printer port address. your printer port located &h378, edit address match your computer's port address.
USING DEMO SOFTWARE Double click application file named "Dem1742". window will appear your screen, shown Figure There menus near window, named Execute Window. Execute menu includes three selections: Initialize, Reset, Exit. Selecting Initialize will instruct program write PCM1742's internal registers with default values. Selecting Reset will instruct program rewrite PCM1742's internal registers with data currently selected application windows. Selecting Exit will close application. Window menu includes three selections: Attenuation, Operational Control, Function Control. following sections provide explanation each window. HOLD PASS Each window button near top. It's labeled either HOLD PASS. setting toggled clicking this button. When HOLD, user change settings window they will written register(s) until button (which appears bottom left corner window) pressed. When PASS, changes made within window immediately written corresponding register(s). Attenuation Window Attenuation window used digital attenuation registers internal PCM1742 shown Figure There attenuator both left right output channels, each attenuator independent reg-
FIGURE Startup Window.
FIGURE Attenuation Window.
DEM-DAI1742
SBAU034
ister control level. Attenuation window, there slider each attenuator register. slider handle arrows each slider adjust attenuation level. left right arrow keys keyboard also used adjust level. Just below each slider status display showing current register setting decimals) corresponding attenuation level decibels (dB). Operational Control Window Operational Control window shown Figure This window used following functions: Soft Mute (Mute Lch, Mute Rch): operation (DAC Lch, Rch): Digital De-Emphasis (DEM): OFF, 32kHz, 44.1kHz, 48kHz
Function Control Window Function Control window shown Figure This window used following functions: Audio Data Format (Format) Digital Filter Low-Pass Response (Roll-Off): Sharp Slow Zero Flag Output: Active HIGH Active Output Phase: Normal Inverted Zero Flag: Independent Common Oversampling Rate: 64/32fS 128/64fS
FIGURE Operational Control Window. more information regarding these functions, refer PCM1742 data sheet.
FIGURE Function Control Window. more information regarding these functions, refer PCM1742 data sheet.
DEM-DAI1742
SBAU034

EVALUATION FIXTURE +VDD AVCC- AVCC+ 3.3V SW006 Format C

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