Texas Instruments DEM-PCM1717 User's Manual
Contents
1. 50 51 52 SPDIF Output Format H L H 16 bits Normal Format MSB First L H H 18 bits Normal Format MSB First L H E 125 16 or 18 bits FIGURE 7 SPDIF Interface Options JUMPER SETTINGS The DEM DAI1717 system board has 5 jumpers blocks that allow the digital outputs from the SPDIF receiver chip to be connected to the PCM1717 The four jumpers that intercon nect the four digital audio signals from the receiver chip are BURR BROWN DEM PCM1717 installed by default An optional ground connection can be made between the receiver chip and the PCM1717E Refer to Figure 8 for the orientation of these jumpers 256fs LRCK BCK DATA GND CS8412 PCM1717E FIGURE 8 DEM DAI1717 Jumper Configuration MODE CONTROL SWITCH SETTINGS The DEM DAI1717 system board uses 5 switches labeled as S3 to select between software and hardware control and to provide settings for the hardware mode When the DEM DAI1717 is to be used with the system software then it is necessary for all of the mode switches to be in the high or off position Figure 9 shows the functions of all five of these switches DEM DAI1717 Off Off Reset Hardware 48kHz 44 1kHz Off De Emphasis 44 1kHz 48kHz Reset 32kHz 32kHz 96 RSTB Mode FIGURE 9 DEM DAII1717 Mode Control Switch Settings PARALLEL PORT CONNECTIONS Figure 10 shows the connecti2. SNO ino 31101 9 uou mer 599 ONE v092VdO NON MOM d d 19 0 H 0832 vl SNO 8158 Ek 31000 Ion D 10 ONASA 427 aa DL v092vdO P ONT 6 4427 OLX 8 airo 3101 9 H Nr ia 3414108 Sy 40217859 in BURR BROWN 1717 Jee 11 FIGURE 11 DEM DAI1717 Schematic GND YS GND HVS Ie gt r Leh D Out Leh F Out Rch F Out Rch D Out R21008P 60A FIGURE 12 DEM DAI1717 Parts Layout BURR BROWN DEM PCM1717 12 FIGURE 13 DEM DAI1717 PCB Design 13 1717 PCM1717 Control Execute E Window W r Mode Register Register 0 Register 1 Execute E Reset R Register
3. For the rest of this manual it will be assumed that the software was installed from the A drive to the C hard drive and that an Icon was created for the software under the Applications program group CONFIGURING THE PCM17DEM INI FILE The DEM PCM1717 software controls the software mode of the PCM1717 by sending messages to the I O address of the parallel port of an IBM compatible PC In order for these control signals to reach the DEM DAI1717 evaluation board the software must be configured for the parallel port to be used The contents of the default pcm17dem ini file is as follows PCM17DEM PCMIFADR amp H3BC The last three characters of the second line of this program specify the I O address will send instructions to the software Typically the IBM PC has three I O addresses that are used for parallel or printer communications The default address for the DEM PCM1717 software is 3BC If the port that is being used to control the DEM DAI1717 system board is different from this default address then the 3BC address should be changed to that address Typical port assignments are as follows If the DEM DAI1717 system board is connected to LPT1 on an IBM PC made in U S then the pcm17dem ini should be modified to read International Printer Port address US LPT1 address US LPT2 address PCM17DEM PCMIFADR amp H378 If the DEM DAI1717 system board is connected to LPT1 on an IBM PC made in U S then the p
4. Format Audio Data Format Select De Emphasis Control Standard Standard Input Audio Data Bit Select Left and Right DACs Soft Mute Polarity of LRCKIN pin 4 Select Internal Zero Detection Circuit Control Left and Right DACs Operation On Off Control Analog Output Mode Select Left Channel FIGURE 17 Demo Software Function Menu Analog Output Mode Select Right Channel Attenuator Control FIGURE 16 Demo Software Format Menu BURR BROWN 15 DEM PCM1717 IMPORTANT NOTICE Texas Instruments and its subsidiaries Tl reserve the right to make changes to their products or to discontinue any product or service without notice and advise customers to obtain the latest version of relevant information to verify before placing orders that information being relied on is current and complete All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment including those pertaining to warranty patent infringement and limitation of liability TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with Tl s standard warranty Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty Specific testing of all parameters of each device is not necessarily performed except those mandated by government req
5. 2 Register 3 Window W Attenuate Function E Dataform D a mem Control Data Control Data HOLD Attenuate Level Control Data Functional Condition lett 4 DeEmph Step 255 Input Format Format ES D Output Format 4 Step 255 L Out L In FIGURE 14 Demo Software Main Menu PCM1717 Attenuate Control Control Data HOLD r Attenuate Level Left le e step 255 r Attenuate Level Left le e al 10 00 dB FIGURE 15 Demo Software Attenuation Menu BURR BROWN DEM PCM1717 14 PCM1717 Format Control PCM1717 Attenuate Control Control Data HOLD Control Data HOLD Input Format Functional Condition Format DeEmph EET Output Forma L Out Att Ctrl L In L lt gt R
6. either the left or right channel data L OUT AND R OUT These two menu selections allow the user to control the analog channels and formats through which the recovered digital data will be sent The choices allow for either channel to be swapped or sent to the other channel allow the two channels to be summed together and the magnitude to be divided by two mono or allows either channel to be muted ATT CTRL This menu controls whether the attenuation controls affect each channel individually or whether both channels are of equal volume BURR BROWN DEM PCM1717 10 PCM1717 FUNCTION CONTROL This menu controls the De emphasis Infinite Zero Detec tion and Operational Enable features of the PCM1717 as shown in Figure 18 These features are controlled by three submenus detailed below DeEMPH This menu allows the selection of three de emphasis fre quencies or allows the de emphasis to be disabled IZD This selection allows the user to turn on or off the infinite zero detection feature Because this feature is either on or off there is no menu for its selection Clicking on the box places an x in its selection and turns off the feature OPE This selection allows the user to enable the operation of the PCM1717 this is equivalent to turning the PCM1717 off As with the previous feature this feature does not have a menu and the PCM1717 is enabled by clicking on the box and turning the PCM1717 on
7. for the SPDIF receiver chip and the 1717 labeled as The power connections and Ma are used to provide for the active filter op amp OPA2604 This amplifier should not be run at power supply voltages greater than 15V The remaining pins are used for ground connections These grounds are not isolated from each other electrically Analog or Audio Connections The analog outputs of the 1717 are brought out directly through RCA jacks CN6 and CN7 for the left and right channel respectively These outputs are referred to 1 2 of the voltage i e the output swings symmetrically about 2 5V for a 5V supply SOFTWARE DESCRIPTION The 1717 demo software is used to control the internal register settings of PCMI717 through a set of four windows The main menu is brought up by clicking on the DI7CTRMK icon in the applications folder MAIN MENU Figure 14 shows the main menu that is brought up when the D17CTRMK icon is selected This menu has three areas of interest The Execute option allows the user to either reset the 1717 to its default power on state using the Reset command or allows the user to exit from the PCM1717 software The execute menu can be opened by either click ing on the Execute or by using the Alt E key sequence All of the menus and commands can be activated by using the mouse and the left button or Alt key sequences The Windows submenu Alt W allows the Atte
8. MI717E audio DAC and its associated circuitry The active filter section uses an OPA2604 op amp to implement a 2nd order filter for reduc tion of out of band noise Figure 6 shows the block diagram of the DEM DAI1717 system board MC MD ML E KC Software Centronics Centronics SPDIF Optical TORX 174 DAI Receiver CS8412 RCA 750 C PCM1717 Le Direct Out Lch Filtered Out OPA2604 Low Pass Filter RCA Connector Rch Filtered Out mO Direct Out 2 GND Vc Vs GND Vs FIGURE 6 DEM DAII1717 Block Diagram BURR BROWN DEM PCM1717 DEM DAI1717 also allows for operation in the hardware mode In this mode the special functions are limited to de emphasis frequency selection soft mute and reset These hardware features are controlled with DIP switches and no PC connection is required DEM DAI1717 SYSTEM CONTENTS DEM DAI1717 Evaluation Board DEM DAII717 Software on a 3 5 high density disc DEM DAII717 Evaluation Board contains a SPDIF in terface an interface for the IBM PC and an external low pass filter for the DAC itself DEM DAII717 Software must be installed under the Windows version 3 1 or Windows 95 DEM DAI1717 SYSTEM REQUIREMENTS An IBM compatible PC with a 386 25MHz processor Windows 3 1 or newer A parallel port with Centronics cable interface s
9. SBAU019 BURR BROWN DEM PCM1717 DEM PCM1717 1 DEM DAI1717 EVALUATION FIXTURE DEM DAI1717 FEATURES BLOCK DIAGRAMS DEM PCM1717 EVALUATION SOFTWARE AND CONNECTOR Basic evaluation board for the PCM1717 requires an external audio processor for connection to digital audio source DEM PCM1717 1 DEM PCM1717 plus Windows evaluation software and connector DEM DAI1717 Evaluation board for the PCM1717 includ ing evaluation software and Digital Audio Interface Centronics Connector E 6 Pin Connector Evaluation Software 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 FAXLine 800 548 6133 US Canada Only Cable BBRCORP Telex 066 6491 FAX 520 889 1510 Immediate Product Info 800 548 6132 1996 Burr Brown Corporation LI 475 Printed in U S A July 1996 BLOCK DIAGRAMS coNr DEM PCM1717 Audio Data LRCK BCK DATA Lch Direct Out 256 384fs PCM1717 Lch Capacitive Out Control Data ML MC MD Rch Direct Out Rch Capacitive Out LPF Lch Direct Out Lch Low Pass Out CS8412 OPA2604 Rch Low Pass Out n n Rch Direct Out DEM DAI1717 GND The information provided herein is believed to be reliable however BURR BROWN assumes no r
10. cm17dem ini should be modified to read PCM17DEM PCMIFADR amp H278 The pcm17dem ini file can be modified using the windows program note pad BURR BROWN DEM PCM1717 717 SYSTEM BOARD INFORMATION GENERAL SPECIFICATIONS Table I lists the specifications for the DEM DAI1717 sys tem board SPDIF Interface Optical via Toslink RCA with 750 impedance System Clock Frequency 256 times sampling frequency fs Digital Audio Interface 16 bits Normal Format MSB last 18 bits Normal Format MSB last 125 16 or 18 bits THD N 0 004 typical with internal 20 2 Low Pass Filter 0 08 typical direct out with external 30kHz Low Pass Filter Dynamic Range 94dB typical EIAJ method A weighted filter SNR 10088 typical method A weighted filter Vs TABLE I DEM DAII1717 General Specifications Maximum Output 2Vrms using internal low pass filter out SPDIF INTERFACE OPTIONS The DEM DAII1717 employs a SPDIF receiver chip This receiver extracts 4 signals from a two wire signal that is interfaced to the board The receiver can supply these four digital audio signals in up to eight different formats Of these formats only three are useful or valid for the PCM1717 The output format is commanded by the setting switches SO S1 and S2 Figure 7 shows the switches and resulting output configurations from the settings Only the three configura tions shown will produce valid outputs from the PCM1717E
11. esponsibility 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 BURR BROWN DEM PCM1717 2 DEM PCM1717 The DEM PCM1717 is the basic evaluation fixture for the PCM1717 AX audio DAC This fixture provides an easy way to connect power data and interface signals to the DAC Figure 1 shows the block diagram of the DEM PCM1717 The user must supply 4 digital audio signals power and mode control signals The DAC will then provide two channels of either directly or capacitively coupled analog outputs The 1717 can be operated either in a hardware or software mode In the software mode either external logic or a processor is used to program four registers internal to the PCM1717 Consult the data sheet for additional informa tion The hardware mode can be evaluated using this fixture by use of the on board DIP switches These switches are connected to pins on the PCM1717 which force either power or ground to the pin In the hardware mode some of the features of the 1717 can be exercised T
12. he selection between the hardware and software mode is done using the mode switch on the DEM 1717 Figure 2 shows the switch settings and the resulting functions attained for the PCM1717 The switches operate in an active low condition ML MC MD RSTB GND Noe 5 PCM1717E FIGURE 1 1717 Block Diagram DEM PCM1717 Mute Off On 48kHz De Em Mute 44 1kHz Off 32kHz ML MC FIGURE 2 1717 Switch Settings Hardware Software RSTB Mode HARDWARE DESCRIPTION Figure 3 shows the schematic diagram of the DEM PCM1717 evaluation board Figure 4 illustrates the PC board design and component placement for the DEM PCM1717 evaluation board Note on the parts layout that there are 3 connectors CN1 CN2 and CN3 is used to connect the digital audio signals to the PCM1717 CN2 is used connect the control lines for the PCM1717 as well as power and ground CN3 is used to access the audio output from the 1717 The analog outputs are available as DC coupled VOR D VOL D or ac coupled VOR C VOL C The DC coupled output is referred to ground and the AC coupled output is referred to 2 typically 2 5V There is also a connection for output of the zero detect flag Use of this pin requires a pull up resistor This resistor is labeled on the schematic and the board and a typical value is 4 7 The crys
13. nuation Alt A Function Alt F and Dataform Alt D submenus to be opened The function of these menus is explained in the next section The bottom of the PCM1717 Main or Control Menu con tains the Hexadecimal value of the current contents of the PCM1717 four control or Mode Registers For a more detailed description of these registers consult the product data sheet for the PCM1717E audio digital to analog con verter A Pass Hold selection is available for all three of these control menus When the Menu is in the Pass mode then commands are sent to the PCM1717 as various selection or options are selected immediately When the Menu is in the Hold mode the changes are held in the software for the DEM PCM1717 until the menu is changed to the Pass Mode ATTENUATE MENU The PCM1717 allows the user to command 255 steps of noiseless attenuation into each channel The left and right channels can either be controlled together i e equal attenu ation of both channels or independent control over each channel Figure 15 shows the attenuation menu To change the attenuation or volume of a channel use the mouse pointer over the bar in the attenuation level menu for the desired channel press and hold the left button and drag the bar to the desired level Pressing the Hold selection in the Control Data section of the Attenuation Control Menu will change the Hold section to Pass and the necessary register settings for the desired attenuation le
14. ons made between the parallel port connector and the pins on the 1717 FIGURE 10 DEM DAI1717 Parallel Port Connections HARDWARE CONNECTIONS FOR THE 717 Hardware configuration of the DEM DAI1717 evaluation board consists of supplying a source of digital audio data connecting the board to an IBM PC parallel port connecting the audio output to a speaker or measurement tool and supplying a source of power to the system board Digital Audio Source Figure 11 shows the schematic drawing of the DEM DAII1717 evaluation board There are a total of four connec tors that must be used for the PCM1717 to reproduce digital audio data Figure 12 details the parts location and orienta tion for the DEM DAII717 evaluation board The PCB layer design for the traces and ground planes used in the DEM DAII1717 system board are shown in Figure 13 Digital Audio Input Data The source of digital audio data is connected via the coax connector labeled as or This port is used if the SPDIF digital audio data comes from a RCA connec tor SPDIF data can also be provided to the DEM DAI1717 system board via fiber optic connection The port that is used for this form of data is connected to the U4 or OPT connection The connection is made using a standard Toslink connector Power Connections A 5 pin connector labeled 1 is used to connect power to the DEM DAI1717 A separate 5V supply is used
15. ource of digital audio data in the SPDIF format Installed and working DEM PCMI717 Software and System Board INSTALLING THE DEM PCM1717 SOFTWARE It is recommended to install the DEM PCM1717 software to the hard disk drive It is possible to run the program from the floppy but not recommended due to operating speed consid erations It is also recommended to use a desk top computer Certain laptop PCs have non standard parallel ports which may not be compatible with DEM DAII1717 From the File Manager select the Create Directory from the File Menu and create a directory called pcm17dem on the hard drive that the software is to be installed on Copy all seven files from the floppy disk s pcm17dem subdirectory CREATING AN ICON FOR THE DEM 1717 PROGRAM The following procedure should be followed to create an Icon for starting DEM PCM1717 software From the Windows Main Menu select Windows Setup From the Windows Setup select Set Up Applications selection From this Menu select the Ask you to specify an application selection The next window will ask for the Application Path and Filename to be specified assuming that drive C was the drive the software was copied to then this path and filename should be typed in as C PCMI7DEM PCMI7DEM EXE Also from the previous menu the Program Group that the icon should be added to can be selected The default choice of Applications is a good choice for this selection
16. receiver PCM1717 and an analog post low pass filter DEM DAI1717 also includes evaluation software PCM1717 contains features which can be programmed ex ternally These features include a 256 step digital attenuator data interface format word length output format etc Refer to the PCM1717 data sheet for a complete description of these special functions LRCK BCK DIN SYSCLK Left Right Audio lt DEM PCM1717 5V Ground FIGURE 5 DEM PCM1717 1 Interface Connection DAI Settings S0 1 2 Mode Settings NE PCM1717 s special functions are programmed via a 3 wire serial interface This type of control is commonly referred to as serial or software control The penalty for using this mode is that the DAC must be controlled via external microproces sor or logic But since most digital audio systems usually contain a microprocessor or micro controller component count is not always increased DEM DAI1717 utilizes the parallel port of an IBM compat ible PC to implement the 3 wire serial programming inter face The evaluation software runs on Windows Operating System The DEM DAI1717 evaluation board consists of three main sections or functions The audio interface section consists of an electrical RCA jack or fiber optics connector to the SPDIF input The input signal is processed into a standard 3 wire serial digital audio interface with the SPDIF receiver The DAC section consists of the PC
17. tal U1 is not included BURR BROWN DEM PCM1717 GND DIN LRCK BCK 1 ML MUTE XTAL MC DM1 g oO MD DMO PCM1717E o RSTB 9770 MODE jx ig DGND CLKO Vos ML MUTE LRCIN MC DM1 DIN MC DMO BACKIN RSTB ZERO 7777 0 CN2 GND ZO VOR C VOR D VOL D VOL C XTAL Gei R1 Not Installed FIGURE 3 1717 Schematic BURR BROWN DEM PCM1717 4 m m m hin we ue ime 5 9 d z 3 FIGURE 4 DEM PCM1717 Parts Layout and Trace Design 5 DEM PCM1717 DEM PCM1 717 1 This demo board kit consist of a DEM PCM1717 hardware board together with an interface cable for connecting the 1717 to power and connecting the software con trol lines to an IBM PC parallel port DEM PCM1717 also includes evaluation software described later under Software Description The interface cable connects to the connector CN2 a source of 5V and ground and the parallel port of an IBM compatible PC Figure 5 shows the block diagram and connection for the DEM PCM1717 1 DEM DAI1717 DEM DAI1717 is a complete evaluation fixture including an SPDIF
18. uirements Customers are responsible for their applications using Tl components In order to minimize risks associated with the customer s applications adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards Tl assumes no liability for applications assistance or customer product design TI does not warrant or represent that any license either express or implied is granted under any patent right copyright mask work right or other intellectual property right of TI covering or relating to any combination machine or process in which such semiconductor products or services might be are used publication of information regarding any third party s products or services does not constitute Te approval warranty or endorsement thereof Copyright 2000 Texas Instruments Incorporated
19. vel will be passed to the PCM1717 The level or volume will change Note that if the Left and Right channels have been chosen to be equal from the Format Control menu then only the Left channel Attenu ation Level will be selectable FORMAT CONTROL MENU This menu allows the user to program the data input format resolution Left Right clock polarity output format and Attenuation formats for the PCM1717 This menu is com posed of six submenus explained below Figure 16 shows the default menu for this section FORMAT This menu allows the PCM1717 to be programmed for either the standard or PS format for incoming data to the DAC The standard format is used when the incoming data is MSB aligned to the Left Right clock or LRCK The PS format is used when the incoming data conforms the Inter IC sound format Refer to the product data sheet of the BURR BROWN DEM PCM1717 PCM1717E for a more detailed explanation of these for mats Selecting either of these formats is done by clicking on the Format window and selecting the desired format WIDTH This menu controls the number of bits that the 1717 uses for digital audio conversion The choices are either 16 or 18 bits LRCK This menu selection allows the user to specify the polarity of the incoming digital audio data when respect to the left right or sample clock The choices allow the user to specify whether the low portion of the left right clock is coincident with
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