® DEM-DAI1737 DEM-DAI1739 EVALUATION FIXTURE INSTRUCTION MANUAL FEATURES ● POWER SUPPLY REQUIREMENTS: ● SOCKET ACCEPTS EITHER PCM1737 OR +5V, +15V, and –15V PCM1739 ● CONNECTOR FOR OPTIONAL EXTERNAL ● ON-BOARD LOW-PASS FILTERS FOR LEFT +3.3V POWER SUPPLY AND RIGHT CHANNELS ● EASY CONFIGURATION USING ON-BOARD SWITCHES AND JUMPERS ● 96kHz DIGITAL AUDIO RECEIVER ACCEPTS S/PDIF AND OPTICAL INPUTS DESCRIPTION ● DEMONSTRATION SOFTWARE FOR PRO- The DEM-DAI1737/1739 is a complete evaluation platform for the PCM1737 and PCM1739 24-bit stereo, audio digital-to-analog converters. All necessary connectors are provided for interfacing to audio test systems and commerical audio equipment. GRAMMING AND READING THE PCM1737’s INTERNAL REGISTERS (requires a PC running Microsoft Windows® 3.1, 95, or 98) ● CENTRONICS CONNECTOR FOR INTERFACING TO A PC PARALLEL PORT (required for the demonstration software) BLOCK DIAGRAM ML MC MDI RST MDO GND +VDD GND 3.3V Regulator SW101 Opt Coax JP001 Digital Audio Receiver and Logic SCKI CLKO BCK BCK (Left Jus) LRCK DATA PCM1737 PCM1739 D/A Converter L/R Ch VCC AVCC– GND AVCC+ VCC 2nd-Order LPF OPA2134 VOUTL VOUTR SW1 - SW3 Format Control International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132 ® © 1999 Burr-Brown Corporation LI-541 1 Printed in U.S.A. November, 1999 DEM-DAI1737/1739 HARDWARE DESCRIPTION DIGITAL AUDIO INTERFACE A digital audio receiver (U002) is provided for easy connection to S/PDIF and optical signal sources, including audio test systems (Audio Precision, Rhode & Schwarz) and commercial audio equipment (CD and DVD players). The receiver can operate up to a 96kHz word rate with 24-bit data. Switches SW001 through SW003 are used to set the receiver output data format, as shown in Table I. Table II shows the jumper configuration for JP001 when using the digital audio receiver. POWER SUPPLIES The evaluation fixture requires three power supplies for operating the PCM1737 or PCM1739, digital support circuitry, and the low pass filter op amp. These supplies are connected to vertical header CN051. VCC is the +5V power supply. It is used to power the analog sections of the PCM1737 or PCM1739, as well as the digital audio receiver (U002) and associated logic (U003 and U004). AVCC+ and AVCC– are used to power the Burr-Brown OPA2134 dual op amp (U201), which performs the D/A output low pass filter function. AVCC+ may be set from +5V to +18V, while AVCC– may be set from –5V to –18V. In addition to the three required external power supplies, a +3.3V supply is required for the PCM1737 or PCM1739. The +3.3V supply is typically derived from VCC using an on-board linear regulator, Burr-Brown’s REG1117-3.3 (U051). A jumper must be installed at CN053 to connect the regulator output to the PCM1737 or PCM1739. A connector (CN052) is provided for connection to an optional external +3.3V power supply. When using CN052, the jumper at CN053 must be removed in order to disable the regulator output. SW001 SW002 SW003 L L H L L H L H L L H H RECEIVER OUTPUT DATA FORMAT 16- to 24-Bit, Left-Justified 16- to 24-Bit, I2S 16-Bit, Right-Justified (or Standard) 18-Bit, Right-Justified (or Standard) TABLE I. Digital Audio Receiver Configuration. 16-BIT 18-BIT 16- TO 24-BIT 16- TO 24-BIT LEFT-JUSTIFIED RIGHT-JUSTIFIED RIGHT-JUSTIFIED I2S FORMAT FORMAT FORMAT FORMAT JP001 JUMPER SCKI BCK (Left Jus) BCK LRCK DATA CLKO GND ANALOG OUTPUTS The Left and Right audio outputs are available at RCA jacks CN201 and CN202 respectively. The outputs are taken from the low pass filter, which has a gain of 2. The low-pass filter may be configured for one of two cut-off frequencies: 54kHz or 108kHz. O NC O O O X O O NC O O O X O O NC O O O X O O O O O O X O O = Install Jumper; NC = Remove Jumper, X = Don't Care. TABLE II. JP001 Jumper Configuration for Use with the Digital Audio Receiver. Switch SW004 is a normally open, momentary contact pushbutton switch used to reset the digital audio receiver when necessary. In addition to the digital audio receiver, the evaluation fixture may be interfaced to an external audio DSP, decoder, or alternative signal source through connector JP001 using standard ribbon cable connections. For f–3dB = 54kHz, jumpers JP201 through JP206 must all be installed. For f–3dB = 108kHz, jumpers JP201 through JP206 must all be removed. ZERO FLAG OUTPUTS The zero flags for the Left and Right channels are brought out on connector CN101. ZFGL is the zero flag for the Left channel, while ZFGR is the zero flag for the right channel. The zero flags are normally Low, but will switch to a High state when 1024 consecutive sample periods (or LRCK periods) have passed with all 0’s data on the DIN (or DATA) input. These flags may be used to control external mute circuitry, or as status indicators for a microcontroller, audio DSP/decoder, or other digitally controlled functions. DIP SWITCH CONFIGURATION—PCM1737 DIP switch SW101 is used primarily for configuration of the PCM1739. When using the PCM1737, the switches should be set as follows: FILT = L MUTE = L IBIT 1739 =L =L RSTB = H DEM0 = H DEM1 = H FORM = H RSTB may be used to force an external reset of the PCM1737. This is done by setting RSTB = L, followed by setting RSTB = H. ® DEM-DAI1737/1739 2 DIP SWITCH CONFIGURATION—PCM1739 PC PARALLEL PORT/HOST CONNECTOR When using the PCM1739, the 1739 switch of SW101 must be set to the ‘H’ position. SW101 is used to set the configuration of the PCM1739’s mode controls. Table III shows the available settings for SW101. The evaluation fixture includes a Centronics connector, CN102, which is used to connect to a PC parallel (or printer) port, or an alternative host controller. This connector is utilized to access the serial control port of the PCM1737. The serial control port is used to program and read the PCM1737’s internal registers. A standard printer cable is used to connect CN102 of the evaluation fixture to a PC parallel port. SW101 SWITCH(s) SETTING FUNCTION FILT L H 8x Oversampling (used for fS up to 96kHz 4x Oversampling (used for fS > 96kHz) MUTE L H Mute Disabled, Normal Operation Mute Enabled, Outputs Forced to Bipolar Zero IBIT L H 24-Bit Audio Data Word Length 16-Bit Audio Data Word Length RSTB L H Reset Mode, Outputs Forced to Bipolar Zero Normal Operation DEM0 Digital De-Emphasis DEM1 DEM1 DEM0 L L L H H L H H FORM L H SCHEMATICS Figures 1 through 4 provide schematics for the DEMDAI1737/1739. PCB LAYOUT Figures 4 through 6 provide PCB plots for the DEMDAI1737/1739. Selection De-Emphasis Disabled 32kHz De-Emphasis Filter 44.1kHz De-Emphasis Filter 48kHz De-Emphasis Filter Standard, Right-Justified Data Format I2S Data Format TABLE III. PCM1739 Mode Control Settings. The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant any BURR-BROWN product for use in life support devices and/or systems. ® 3 DEM-DAI1737/1739 3 VCC C004 0.1µF 4 C001 0.01µF C002 0.01µF C006 0.1µF + C005 10µF VCC M2 M1 M0 M3 14 13 12 11 10 9 8 7 6 5 4 3 2 1 SEL M1 12 M2 4 13 M3 M2 M0 M1 M0 SW001 U003 HC14 15 SW002 U003 HC14 CBL 16 17 18 19 20 21 22 23 24 25 26 27 28 SW003 13 12 1 2 4 5 10 9 U004 HC32 +VCC 11 3 6 8 U CS12/FCK M3 RXN SCK RXP M2 FILT MCK DGND FSYNC VA+ AGND VD+ M0 C0/E0 Cb/E2 M1 ERF Cc/F0 Ca/E1 Ca/F2 SDATA Cd/F1 VERF C 3 U101 CS8414 C012 10µF VCC + VCC C008 0.1µF CN002 + VCC R004 470Ω LRCK BCK 1 19 BCK LRCK DATA 1 SCKI X MDI JP2 RST MC 4 6 24 IBIT VDD 1739 8 26 7 25 10 28 + C104 10µF C103 + 10µF C11 10µF 9 27 + 14 13 12 11 10 9 8 7 1 ZEROR ZEROL RSTB NC(3) NC(2) VCCL GNDL SCLK VSS VDD TEST1 TEST2(1) VCCR GNDR VOUTL VCCA VOUTR GNDA EXTL MDO(4) CLKO EXTR MDI(5) BCLK ML(7) MC(6) DATA LRCK PCM1737 OE1 2A1 11 1Y4 12 2A2 13 1Y3 14 2A3 15 1Y2 16 2A4 17 1Y1 18 15 33 NOTES: For PCM1739, these pins become: (1) IBIT (2) FILT (3) MUTE (4) NC (5) DEM0 (6) DEM1 (7) FORM C11 10µF 6 5 4 3 2 1 OE2 8 1A4 9 2Y1 6 1A3 7 2Y2 4 1A2 5 2Y3 19 11 29 MDO 4 22 5 23 3 12 30 13 31 2 1A1 3 2Y4 15 16 17 18 19 20 21 22 23 24 25 26 27 28 18 36 ML 3 21 2 14 32 U102 VHC244 16 34 17 35 RSTB 2 20 ML BCK (left-justified) BCK (left-justified) SCKI DATA SW004 PUSHSW D001 1S1500 C009 0.068µF R002 470Ω C007 10µF R003 47kΩ RA101 47kΩ VDD MC CN102 MDI C108 0.1µF C104 + 10µF + C103 10µF + C 108 10µF ZFGL ZFGR CN101 MDO MDI MC ML VERF ERF FIGURE 1. DAC, Digital Audio Interface, and I/O Connections. R001 75Ω CN001 COAX + C003 10µF TORX176 1 U001 2 4 5 6 MDO RSTB DEM-DAI1737/1739 + ® VOUTR VCC VOUTL IBIT 1739 SW101 VDD 4 3 2 1 R205 15kΩ C209 120pF JP203 C201 10µF/16V VOUTL R201 8.2kΩ JP201 C207 120pF R203 1kΩ R207 100Ω 2 + 3 C203 1200pF JP205 C205 1200pF 1/2 OPA2134A 4 1 CN201 RCA U201 AVCC+ R206 15kΩ C210 120pF JP204 C202 10µF/16V VOUTR R202 8.2kΩ JP202 C211 10µF/16V + C212 10µF/16V AVCC– JP206 C208 120pF R204 1kΩ 6 + 5 C204 1200pF + 8 1/2 OPA2134A 7 R208 100Ω CN202 RCA U201 C206 1200pF FIGURE 2. DAC Low-Pass Filters. ® 5 DEM-DAI1737/1739 VDD VCC GND U051 REG1117-3.3 CN052 1 GND GND AVCC– AVCC+ 5 3 1 CN1 Out GND IN 1 2 2 3 4 2 GND 3.3V VDD VCC C056 10µF CN053 + C055 0.1µF + + C90 0.1µF GND VDD C89 100µF C92 100µF + VCC C109 0.1µF For U102 C93 100µF C010 0.1µF VCC AVCC– C011 0.1µF GND For U003, U004 FIGURE 3. Power Supply Connections. FIGURE 4. Silk Screen (top side). ® DEM-DAI1737/1739 + 6 AVCC+ GND FIGURE 5. Top Side Layer. FIGURE 6. Bottom Side Layer. ® 7 DEM-DAI1737/1739 PCM1737 DEMONSTRATION SOFTWARE The Execute menu includes three selections: Initialize, Reset, and Exit. Selecting Initialize will instruct the program to write all of the PCM1737’s internal registers with the default values. Selecting Reset will instruct the program to re-write the PCM1737’s internal registers with the data currently selected in the application windows. Selecting Exit will close the application. Software is provided with the DEM-DAI1737/1739 to allow programming of the PCM1737’s internal registers. The software will operate on computers running Microsoft Windows 3.1, 95, or 98. The demo software requires that the PC printer port be connected to CN102 of the DEM-DAI1737/ 1739 using a standard printer cable. The Window menu includes four selections: Attenuation, Operational Control, Function Control, and Register Read. The following sections provide an explanation of each window. HOLD and PASS INSTALLATION The demo software is distributed on a 3.5-inch floppy disk. There is a single folder on the disk, named “Dem1737”. This folder contains the application and all support files. To install the software on your computer, first create a new folder on your hard drive with an appropriate name (e.g., Dem1737, Pcm1737, etc). Then open the “Dem1737” folder on the installation floppy and copy all of the files in it to your new folder. Each window has a button near the top. It’s labeled either HOLD or PASS. The setting is toggled by clicking on this button. When set to HOLD, the user can change the settings in a window but they will not be written to the register(s) until the OK button (which appears at the bottom left corner of the window) is pressed. When set to PASS, changes made within a window are immediately written to the corresponding register(s). Attenuation Window Open the configuration settings file named “Dem1737” with a text editor, such as Notepad or WordPad. When the file is opened, find the following line: PCMIFADR = &h378 The Attenuation window is used to set the digital attenuation registers internal to the PCM1737 and is shown in Figure 8. There is an attenuator for both the Left and Right output channels, and each attenuator has its own independent register to control its level. In the Attenuation window, there is a slider for each attenuator register. Use the slider handle or the arrows at each end of the slider to adjust the attenuation level. The left and right arrow keys on the keyboard can also be used to adjust the level. Just below each slider is a status display showing the current register setting (in decimal) and the corresponding attenuation level in decibels (dB) relative to the input signal level. The Attenuation window also includes the ATLD, or Attenuation Load Control. When ATLD is set to OFF, the attenuator function is disabled. When ATLD is set to LOAD, changes in slider settings will take effect immediately (if the window is set to PASS), or when the OK button is clicked (if the window is set to HOLD). The &h378 indicates the printer port address that the demo software will use to communicate with the DEM-DAI1737/ 1739. This address must be set to &h378, &h278, or &h3BC. Most PC’s use &H378 as the default printer port address. If your printer port is not located at &h378, edit the address to match your computers port address. USING THE DEMO SOFTWARE Double click on the application file named “dem1737”. A window will appear on your screen, as shown in Figure 7 There are two menus near the top of the window, named Execute and Window. FIGURE 8. Attenuation Window. FIGURE 7. Startup Window. ® DEM-DAI1737/1739 8 The Attenuation window also includes the ATTS, or Attenuation Speed Control. ATTS is used to set the rate at which the attenuator is stepped when a level change is made. The speed is either 2/fS or 4/fS, where fS is the sampling frequency. Operational Control Window The Operational Control window is shown in Figure 9. This window is used to set the following functions: • Soft Mute (Mute Lch, Mute Rch): ON or OFF • DAC Operation (DAC Lch, DAC Rch): ON or OFF • Zero Detect Mute (IZD): ON or OFF • Digital De-Emphasis (DEM): OFF, 32kHz, 44.1kHz, or 48kHz For more information regarding these functions, refer to the PCM1737 data sheet. Function Control Window FIGURE 9. Operational Window. The Function Control window is shown in Figure 10. This window is used to set the following functions: • DAC Oversampling Rate (OVER): 64fs or 128fs • Digital Interpolation Filter Rate (K192): 8x or 4x • Digital Filter Low Pass Response (FLT): Sharp, Slow 1, or Slow 2 • CLKO Enable (CLKE): ON or OFF • CLKO Rate (CLKD): fSCLK (Normal) or fSCLK / 2 (1/2 XTI) • Audio Data Format (Format) For more information regarding these functions, refer to the PCM1737 data sheet. Register Read Window The PCM1737 serial control interface includes register read capability. The Register Read window allows the user to read the value of all PCM1737 registers by pressing a single button. The window is shown in Figure 11. The Register Read window provides a means to check for proper communications between the PC printer port and the DEM-DAI1737/ 1739, by allowing the user to verify register write operations. FIGURE 10. Function Control Window. FIGURE 11. Register Read Window. ® 9 DEM-DAI1737/1739