DEM-DAI1738 Instruction Manual

Transcription

1 Burr-Brown Products from Texas Instruments User s Guide SLAU069A - November 2002 DEM-DAI1738 Instruction Manual Hajime Kawai DAV Digital Audio/Imaging Japan (DAI) ABSTRACT This user s guide describes the DEM-DAI1738 evaluation fixture for the PCM1738 stereo digital-to-analog (D/A) converter. Contents Features and Description Operation and Function Control of DAI Section Crystal/External Clock Selection PCM Audio Interface V Power Supply for Digital VDD AC/DC Coupling Selection Schematic Diagram DIR Section Schematic Diagram DAC, Analog, and Power Supply Section Schematic Diagram Power Supply for Operational Amplifier and CN 1/CN 2 Connectors Section Printed-Circuit Board Demonstration Software List of Figures 1 Block Diagram Optical/Coax Input Selection Function and Operation Control of DIR JP-2 Connection Crystal/External Clock Selection PCM Audio Interface V Power Supply AC/DC Coupling Selection DIR Section DAC, Analog, and Power Supply Section Power Supply for Operational Amplifier and CN 1/CN 2 Connectors Section Printed-Circuit Board Printed-Circuit Layout Parts Location Trademarks are the property of their respective owners. 1

2 14 Top-Side Layer Bottom-Side Layer Demonstration Software Window List of Tables 1 System Clock Frequency Audio Interface Format External Clock Selection Component Values for DAC Analog Power Supply Section Function Control Features and Description The DEM-DAI1738 is an evaluation fixture for the PCM bit, 192-kHz sampling stereo D/A converter. This evaluation fixture utilizes a DEM-DAI1738 demonstration board and demonstration software for function and operation control of the PCM1738. The DEM-DAI1738 consists of a DAI (S/PDIF) section that uses a DIR1703 DAI receiver, a PCM1738 DAC section, a differential I/V section, and a balanced amplifier with post LPF section. The DEM-DAI1738 requires a 5-V digital power supply for its digital circuits, a 5-V analog power supply for the PCM1738, and ±15-V analog power supply for the I/V and balanced amplifier circuits. The DAI section has both coax and optical inputs that can be selected by a mounted switch and are capable of handling sampling rates up to 96 khz. The PCM1738 accepts up to 192-kHz sampling PCM audio data input and 64 f s DSD signal input through function control and jumper connection on board. COAX Amp SYSCLK PCM DATA Function Control CN-2 I/V L OPA627 or 5534 I/V L OPA627 or 5534 BAL/LPF OPA2134 Lch OUT SW1 DIR1703 PCM1738 OPT TORX 3.3 V REG Mode Control SW2 CN-3 JP-2, JP CN V REG I/V R OPA627 or 5534 I/V R OPA627 or 5534 BAL/LPF OPA2134 Lch OUT DGND 5 V VDD AGND 5 V VCC 15 V VA AGND 15 V VA Figure 1. Block Diagram 2 DEM-DAI1738 Instruction Manual

3 Operation and Function Control of DAI Section optical/coax input selection SW1 is the optical/coax S/PDIF digital input selection switch. This switch is illustrated in Figure COAX OPT Figure 2. Optical/Coax Input Selection function and operation control of DIR1738 SW2 is the function and operation control switch for the DIR1738. This switch is illustrated in Figure 3. SCF0 SCF1 System Clock Frequency Selection (128 fs / 256 fs / 384 fs / 512 fs) OFF RESET : RESET. L: NORMAL Operation. H / Reset Operation FMT0 FMT1 DAI Output PCM Audio Interface Format Selection (Right-Justified, Left-Justified, IIS) L H CKSEL : Operation Mode Selection. L/PLL. H/XTL ** CKSEL Must be L JP 2 Connection Figure 3. Function and Operation Control of DIR1738 Table 1. System Clock Frequency SCF0 SCF1 SYSTEM CLOCK FREQUENCY L L 128 fs L H 256 fs H L 384 fs H H 512 fs Table 2. Audio Interface Format FMT0 FMT1 AUDIO INTERFACE FORMAT L L 16-bit, MSB first, right-justified L H 24-bit, MSB first, left-justified H L 24-bit, MSB first, right-justified H H 24-bit, IIS JP-2 is used to enable CKSEL. Jumper on 3 4 enables CKSEL. This jumper connection is illustrated in Figure Jumper Connection : Normal (Enable CKSEL) JP-2 Figure 4. JP-2 Connection DEM-DAI1738 Instruction Manual 3

4 Crystal/External Clock Selection Jumper JP-3 is used for selection of crystal oscillator or external clock frequency. This jumper connection is shown in Figure 5. Table 3 gives the external clock frequencies that can be selected using JP 3 for different sampling rates JP-3 Figure 5. Crystal/External Clock Selection SAMPLING RATE Table 3. External Clock Selection 128 fs 256 fs 384 fs 512 fs BRSEL CONNECTED TO 32 khz MHz BFRAME khz EMFLG 2 48 khz Open khz URBIT 3 96 khz CSBIT 4 PCM Audio Interface The PCM audio data and system clock from the DIR1701 can be connected to the digital input of the PCM1738 by a jumper connection on CN 1. External audio data input can be interfaced using the right side pins on CN 1. Refer to the current version of the PCM1738 data sheet, TI literature number SBAS174, for interface connections of digital filter (DF) and direct stream digital (DSD) modes. SYSTEM CLOCK GND LRCK DATA BCK (DIR 1702 OUT) GND SCKI PCM1738 LRCK DATA BCK MUTE ZEROL ZEROR CN-1 Figure 6. PCM Audio Interface 4 DEM-DAI1738 Instruction Manual

5 5-V Power Supply for Digital VDD The DEM DAI1738 requires 5-V digital and analog power supplies. These supplies must be kept separate to prevent interference between the digital and DAC/analog sections. The JP 1 connection allows common connection of the 5-V V DD and 5-V V CC supplies for limited power supply availability during actual evaluation. 5 V VDD 5 V VCC Digital Section JP-1 4 DAC Section Figure 7. 5-V Power Supply AC/DC Coupling Selection Jumpers 4 and 5 are used for dc or ac-coupling selection between I/V converter output and balanced amplifier input. CA16 (18) Unmounted (10 µf 220 µf) From I/V Amp Output To Balanced Amp Input JP-4(5) CA16 (19) Unmounted (10 µf 220 µf) Figure 8. AC/DC Coupling Selection DEM-DAI1738 Instruction Manual 5

6 Schematic Diagram DIR Section Figure 9 shows the schematic diagram for the DIR section. 5 V VDD 3.3 V VDD JP-2 CF pf RF1 1.2 kω CF nf SO GND LO BO DO XT C9 22P X Y Z 10 µf 0.1 µf C6 C8 R1 1 MΩ C10 22P U1 DIR1703 ADFLG CKSEL BRATE0 UNLOCK BRATE1 FMT1 SCKO FMT0 VDD VCC DGND AGND XTO FLT XTI RST CKTRNS DIN LECKO BRSEL BCKO BFRAME DOUT EMFLG SCF0 URBIT SCF1 CSBIT µf C7 C5 µf A SW-2 A X CKSEL FMT1 FMT0 RESET SCF0 SCF1 UNLOCK FLT(*1) BFRAME EMFLG(*2) URBIT CSBIT ADFLG COAX IN PJ-1 C16 R3 1 MΩ R4 10 Ω C µf Y Z BRATE0 BRATE1 GND CN-3 OPT IN R2 75 Ω µf U3 74HCU04 U4 3 C11 10 µf TORX-173/ C µf SW-1 COAX / OPT JP-3 D1 R5 10 kω C15 10 µf 3.3 V VDD Figure 9. DIR Section (*1) : Silk Shows EMFLG/FLT (*2) : Silk Shows PEFLG 6 DEM-DAI1738 Instruction Manual

7 Schematic Diagram DAC, Analog, and Power Supply Section Figure 10 shows the schematic diagram for the DAC, analog, and power supply section. 3.3 V V DDA 5 V VCC ZL ZR L D B S UAD PCM1738E 1 28 CA1 CA2 RST RST V CC ZEROL ZEROR AGND2 I OUT L LRCK I OUT L 5 CA5 24 DATA V CC BCK V CC CA6 SCKI V COM 3 REF CA4 CA RA1 DGND I 9 20 V DD V COM 2 CA SCKO V COM 1 MD MC CS MDO MDI MC CS AGND1 I OUT R I OUT R MUTE RA2 CA8 _ RA4 UA1 JP-4 UA2 _ RA5 CA9 RA3 CA10 _ RA6 UA3 JP-5 UA4 _ RA7 CA16 CA17 CA18 CA19 RA12 RA8 RA16 CA20 RA9 RA17 RA13 RA14 RA10 RA18 CA21 RA11 RA19 RA15 CA22 _ CA24 CA23 _ CA25 RA20 RA21 M RAC RAM CA11 GND TM 1 5 V V DD TM 2 GND TM 3 5 V V CC TM 4 15V VA TM 5 GND TM 6 15V VA TM 5 CPD1 CPD2 JP-1 CP1 CP4 CP2 CP5 CP3 CP6 LED1 UP1 REG1117 CP12 CP11 RP2 CP10 LP1 UP1 REG1117 CP8 CP9 3.3 V V DDA RP1 CP7 5 V V CC 15 V VA 15 V VA 3.3 V V DD 5 V V DD Figure 10. DAC, Analog, and Power Supply Section DEM-DAI1738 Instruction Manual 7

8 Table 4 presents the component values for the DAC, analog, and power supply section. Table 4. Component Values for DAC, Analog, and Power Supply Section COMPONENT NUMBER COMPONENT VALUE CP1, CP2, CP3 220 µf, 25 V CP7, CP11 CP20 1 µf, 25 V CP8, CPD1 100 µf, 16 V CA2, CA4, CA5, CA6, CA7, CP11, CP12 10 µf, 16 V CA16 CA19 47 µf, 25 V CP4, CP5, CP6, CP9, CA1, CA µf CA8, CA9, CA10, CA pf CA20, CA pf CA22 CA pf CP10, CPD2 0.1 µf LP1 47 µf RP1 10 Ω, 1/4 W RA1 16 kω, 1/8 W RA2, RA3, RA20, RA Ω, 1/8 W RA4 RA Ω, 1/8 W RP2 330 Ω, 1/8 W RAC, RAM 10 kω, 1/8 W CA16, CA17, and CA18 are not mounted 8 DEM-DAI1738 Instruction Manual

9 Schematic Diagram Power Supply for Operational Amplifier and CN 1/CN 2 Connectors Section Figure 11 shows the schematic diagram for the power supply for the operational amplifier, CN 1, and CN 2 connector section. 15 V VA 7 _ CP11 UA1 4 CP12 15 V VA 15 V VA _ CP13 UA2 CP14 _ CP15 UA3 15 V VA 15 V VA 8 _ CP19 UA5 4 CP20 15 V VA 15 V VA CP16 15 V VA 15 V VA _ CP17 UA4 CP18 15 V VA CN kω V V DDA CS MD MC RST CN-1 SO S LO DO BO GND L D B M ZL ZR Figure 11. Power Supply for Operational Amplifier and CN 1/CN 2 Connectors Section DEM-DAI1738 Instruction Manual 9

10 Printed-Circuit Board Figure 12 shows the printed-circuit board. Figure 12. Printed-Circuit Board 10 DEM-DAI1738 Instruction Manual

11 parts location Figure 13 shows the printed circuit layout. Figure 13. Printed-Circuit Layout Parts Location DEM-DAI1738 Instruction Manual 11

12 top-side layer Figure 14 shows the top-side layer of the DEM DAI1738 printed-circuit board. Figure 14. Top-Side Layer 12 DEM-DAI1738 Instruction Manual

13 bottom-side layer Figure 15 shows the bottom-side layer of the DEM DAI1738 printed-circuit board. Demonstration Software Figure 15. Bottom-Side Layer Software is provided with the DEM DAI1738 to allow programming of the PCM1738 s internal registers. The software operates on computers running Microsoft Windows 3.1, 95, or 98. The demonstration software requires connection of the PC printer port to CN 2 of the DEM DAI1738 using a standard printer cable. installation The demonstration software is distributed on a 3.5-inch floppy disk. To install the software on your PC computer, first create a new folder on your hard drive with an appropriate name (such as DEM1738). Then open the Dem1738 folder on the installation floppy disk and copy all its files to your new folder. Open the configuration setting file named # Dem1738 using a text editor, such as Notepad. After the file opens, search for the following line: DEM-DAI1738 Instruction Manual 13

14 PCMIFADR = &h378 The &h378 indicates the printer port address that the demonstration software uses to communicate with the DEM DAI1738. This address must be set to %h378, &h278, or &h3bc. Most PCs use &h378 as the default printer port address. If your printer port is not located at &h378, edit the address to match your computer s port address. using the demonstration software Double-click on the application file named DEM1738. A window appears on your screen, as shown in Figure 16. There are two menu selections (Execute and Window) near the top of the window. The Execute menu includes three selections: Initialize, Reset, and Exit. Selecting Initialize instructs the program to write all of the PCM1738 s internal registers with the default values. Reset instructs the program to rewrite the PCM1738 s internal registers with the data currently selected in the application windows. Exit closes the application. The Window menu includes four selections: Attenuation control, Operation control, Function control, and Register read. The following sections provide an explanation of each window. HOLD and PASS Each window has a button near the top which is labeled either HOLD or PASS. The current setting is toggled by clicking on this button. When set to HOLD, the settings in a window can be changed, but are not written to the register(s) until the OK button (which appears at the bottom of the window) is pressed. When set to PASS, any setting changes made in a window are immediately written to the corresponding register(s). function control Enable operation and function control of the DEM DAI1738 are shown in the following table. 14 DEM-DAI1738 Instruction Manual

15 Table 5. Function Control FUNCTION DEFAULT REGISTER BIT Functions available for both write and read Digital attenuation control 0 db to 120 db and mute, 0.5 db step 0 db Register 16 for L-channel Register 16 for L-channel ATL[7:0] ATR[7:0] Attenuation load control Disable, enable Attenuation disable Register 18 ATLD Attenuation speed selection 1 fs speed selection 1 fx Register 19 ATS[1:0] Soft mute control Mute disable, enable Mute disable Register 18 MUTE Infinite zero mute control Disable, enable Disable Register 19 INZD Input audio data format selection 16/20/24-bit standard (right-justified) 24-bit MSB-first left-justified 16/24-bit standard (right-justified) 16-bit standard format Register 18 FMT[2:0] De-emphasis control Disable, enable De-emphasis disable Register 18 DME Sampling rate selection for de-emphasis Disable, 44.1 khz, 48 khz, 32 khz De-emphasis disable Register 18 DMF[1:0] Digital filter rolloff selection Sharp rolloff, slow rolloff Sharp rolloff Register 19 FLT Output phase reversal Normal, reverse Normal Register 19 REV DAC operation control Enable, disable DAC operation enabled Register 19 OPE System clock (SCKO) output control Output enable, disable Output enabled Register 19 CLKE System clock (SCKO) rate control SCK1, SCK2 SCKI Register 19 CLKD System reset control Reset operation, normal operation Normal operation Register 20 SRST Mode register reset control Reset operation, normal operation Normal operation Register 20 MRST Digital filter bypass control DF enable, DF bypass DF enabled Register 20 DFTH Delta-Sigma oversampling rate selection 64 fs, 128 fs, 32 fs 64 fs Register 20 OS[1:0] Delta-Sigma order selection 3rd order, 5th order 3rd order Register 20 DSOS Monaural mode selection Stereo, monaural Stereo Register 20 MONO Channel selection of monaural mode data L-channel, R-channel L-channel Register 20 CHSL Functions available only for read Zero-detection flag Not zero, zero detected Not-zero = 0 Zero detected = 1 Register 21 ZFGL for L-channel ZFGR for R-channel DEM-DAI1738 Instruction Manual 15

16 PCM1738 demonstration software window Attenuation Control Operation Control Function Control Figure 16. Demonstration Software Window 16 DEM-DAI1738 Instruction Manual

17 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI s terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI s standard warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and applications using TI components. To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards. TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information published by TI regarding third party products or services does not constitute 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 without alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for such altered documentation. Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is not responsible or liable for any such statements. Mailing Address: Texas Instruments Post Office Box Dallas, Texas Copyright 2002, Texas Instruments Incorporated