DEM-DAI1604

DEM-DAI1604 BURR-BROWN | Alldatasheet

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Technical content

FEATURES

l COMPLETE EVALUATION PLATFORM FOR THE PCM1604 SIX-CHANNEL AUDIO D/A CONVERTER l DIGITAL AUDIO INTERFACE SUPPORTS S/PDIF INPUTS UP TO 96kHz FROM COM- MERCIAL AUDIO EQUIPMENT AND AUDIO MEASUREMENT SYSTEMS (Both RCA and Optical Input Connectors Provided) l DUAL IN-LINE HEADER SUPPORTS CON- NECTION TO AN EXTERNAL AUDIO DSP OR DECODER l 2ND-ORDER LOW-PASS ACTIVE FILTERS FOR EACH DAC OUTPUT l INCLUDES DEMONSTRATION SOFTWARE FOR WRITING AND READING PCM1604 CONTROL REGISTERS (Requires a PC with Microsoft Windows ® 3.1, 95, or 98) l CENTRONICS CONNECTOR PROVIDED FOR CONNECTION TO A PC PRINTER PORT (Required for Demonstration Software) © 2000 Burr-Brown Corporation LI-554 Printed in U.S.A. April, 2000 BLOCK DIAGRAM DEM-DAI1604 EVALUATION FIXTURE 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 l REQUIRES THREE POWER SUPPLIES: +5V, +15V, AND –15V l ON-BOARD REGULATOR GENERATES +3.3V FROM THE +5V SUPPLY l SUPPORTS AN OPTIONAL EXTERNAL +3.3V SUPPLY

DESCRIPTION

The DEM-DAI1604 demonstration board provides an ideal platform for evaluating the performance and operation of the PCM1604 six-channel audio digital- to-analog converter. Demonstration software is in- cluded for controlling the PCM1604’s programmable functions. The D/A converter outputs are filtered and passed on to RCA jacks for connection to audio measurement equipment and commercial audio gear. A digital audio receiver allows connection to S/PDIF data streams, while an on-board connector provides an interface to audio Digital Signal Processors (DSP) and decoders. Digital Audio Receiver and Logic SW1 - SW3 Format Control Coax Opt PCM1604 Daughter Card 2nd-Order LPF OPA2134 VOUT 1 VOUT 2 JUMPER SYSCLK SCKO BCLK LRCK DIN1 DIN2 L/R ch DIN3 L/R ch L/R ch 2nd-Order LPF OPA2134 VOUT 3 VOUT 4 2nd-Order LPF OPA2134 VOUT 5 VOUT 6 GND +5V –15V GND +15VML MC MDI RST MDO GND +3.3V 3.3V REG. SW5 +5V SBAU012

The DEM-DAI1604 requires three external supplies: a +5V supply (VCC ) is required for the PCM1604; a digital audio receiver (U3); and associated logic circuitry (U3, U4). An on-board regulator (Burr-Brown REG1117-3.3) is used to generate +3.3V from V CC , which is required by the PCM1604 and associated buffers (U5, U6). The output of the regulator can be disabled by a jumper (JP3) and an external +3.3V supply may then be provided at connector CN4. The op amps used for the low-pass active filters (U50 through U52 ) require positive and negative power supplies. The +V S supply is typically +15V , with a maximum value of +18V and a minimum value of +5V . The –VS supply is typically –15V , with a minimum value of –18V and a maximum value of –5V . The power supplies used for V CC , +VS, and –VS should be well regulated and filtered. Switching power supplies may be used, but linear regulated supplies are recommended for optimal performance. All supplies should be rated for a minimum of 500mA of output current. DIGITAL AUDIO INTERFACE The digital audio interface is provided by a Crystal CS8414 digital audio receiver (U3). The interface is used to receive a stereo, linear PCM, S/PDIF data stream from either an electrical or optical source. The electrical input is furnished by an RCA connector (PJ1), while the optical input is provided by a Toshiba TOSLINK optical receiver (OPT). S/PDIF streams are available from industry standard audio test systems (Audio Precision, Rhode & Schwarz), as well as commercial audio equipment (DVD, CD, and DAT players). The CS8414 outputs a stereo data stream at it’s SDATA pin. This may be used by any or all of the PCM1604’s three data inputs, DIN1 through DIN3. Jumper block JP2 is used to connect the CS8414 data output to the desired PCM1604 data input pins. PCM1604 DAUGHTER CARD The PCM1604 package is soldered directly to a small printed circuit board, referred to as the “daughter card.” The daughter card includes four male connectors which plug into four corresponding female connectors on the DEM- DAI1604 board. The daughter card arrangement is used to provide the best possible dynamic performance, while al- lowing the PCM1604 to be easily interchanged with future multi-channel D/A products. DAC OUTPUT FILTERS Three dual op amps (Burr-Brown OPA2134 ) are included to provide 2nd-Order Butterworth low-pass filters for the DAC outputs. These filters are required to attenuate the out-of- band noise generated by the PCM1604’s delta-sigma D/A converters. PC PRINTER PORT INTERFACE A Centronics connector is included so that the DEM-DAI1604 may be connected to a PC printer port. The demonstration software included with the DEM-DAI1604 uses this connec- tion to write and read the PCM1604’s internal registers through the MDO, MDI, MC, and ML pins. CONNECTORS CN1 is the main power supply connector. Connections for V CC , +VS, –VS, and power supply grounds are provided. CN2 is the zero flag connector. Connector pins ZFLGA and ZFLG1 through ZFLG6 correspond directly to the zero flag output pins of the PCM1604. Alternatively, the zero flag outputs may be used as general purpose logic outputs. CN3 is a Centronics connector used to interface the DEM- DAI1604 to a PC printer port. The +5V logic signals from the printer port are buffered by U6. CN4 is used to connect an optional external +3.3V power supply to the DEM-DAI1604. Typically, this connector is not used since an on-board regulator IC (U8) is used to generate the +3.3V supply. If an external +3.3V supply is used, remove the jumper at JP3. CN10 through CN13 provide the connection to the PCM1604 daughter board. Figure 1 shows the electrical connections for CN10 through CN13. Figure 4 shows the daughter card schematic. The mapping between the daughter card connec- tors and CN10 through CN13 is shown in Table I. OPT is the optical receiver input to the CS8414 digital audio receiver. PJ1 is the RCA connector used for shielded cable input to the CS8414 digital audio receiver. PJ2 is the audio output connector corresponding to the PCM1604’s V OUT 1 output. PJ3 is the audio output connector corresponding to the PCM1604’s V OUT 2 output. PJ4 is the audio output connector corresponding to the PCM1604’s V OUT 3 output. PJ5 is the audio output connector corresponding to the PCM1604’s V OUT 4 output. PJ6 is the audio output connector corresponding to the PCM1604’s V OUT 5 output. PJ7 is the audio output connector corresponding to the PCM1604’s V OUT 6 output. DEM-DAI1604 CONNECTOR DAUGHTER CARD CONNECTOR CN10 CN001 CN11 CN002 CN12 CN003 CN13 CN004 TABLE I. Daughter Card Connector Mapping.

Switches SW1 through SW3 are used to select the audio data output format for the CS8414. Table II shows the output format selections that are used with the PCM1604. Switch SW5 is used to set the state of the reset (RST) pin of the PCM1604. Table III shows the reset selections. CKS0 and CKS1 are unused and should be set to ‘L’. JUMPERS Jumper JP1 is used to select a non-inverted (NML) or inverted (INV) bit clock for the PCM1604. Table IV shows the proper settings for JP1 for the four input data formats shown in Table II. DATA FORMAT JP1 SELECTION 16 - 24-Bit Left-Justified, MSB-First INV 16 - 24-Bit I2S NML 16-Bit, Standard Right-Justified, MSB-First NML 18-Bit, Standard Right-Justified, MSB-First NML TABLE IV . JP1 Jumper Selection for Audio Data Formats. SW1 SW2 SW3 DATA FORMAT L L L 16-24 Bit Left-Justified, MSB-First (1) L H L 16-24 Bit I 2S(2) H L H 16-bit Standard Right-Justified, MSB-First (2) H H L 18-bit Standard Right-Justified, MSB-First (2) NOTE: (1) Jumper JP1 must be set to the INV position when using this format. (2) Jumper JP1 must be set to the NML position when using this format. TABLE II. Digital Audio Receiver Output Data Format Settings. TABLE III. Reset (RST) Operation. RST MODE OF OPERATION L Normal H Reset (1) NOTE: (1) The RST pin of the PCM1604 is active LOW. Due to the demo board design, the ‘H’ selection closes the switch and connects RST to ground. The ‘L’ selection opens the switch and the RST pin is set to logic ‘1’ by an internal pull-up resistor. Jumper block JP2 is used to connect the digital audio receiver output data and clocks to the PCM1604 daughter card. The jumpers may be removed from JP2 to allow connection to an audio DSP or decoder. Figure 1 shows the electrical connections for JP2. Note that pins DIN1 through DIN3 include 10kΩ pull-down resistors, which may be used to set the data inputs to logic ‘0’ for testing zero detection functions and output cross talk performance. Jumper JP3 is used to enable or disable the on-board +3.3V regulator output. When the jumper is installed, the regulator is used as the +3.3V supply. When it is removed, an external supply, connected at CN4, may be used to supply the +3.3V . SCHEMATICS Schematics for the DEM-DAI1604 are shown in Figures 1 through 4. Figure 1 shows the digital audio receiver, associ- ated logic, and digital I/O connectors. Figure 2 shows the DAC low pass filters, while Figure 3 illustrates the power supply connections. Figure 4 shows the PCM1604 daughter card circuitry and connectors.

FIGURE 1. Main Schematic for the DEM-DAI1604. NOTE: (1) Resistors R8 - R14 are 22Ω .

FIGURE 2. DAC Output Filters.

FIGURE 3. Power Supply Connections.

FIGURE 4. PCM1604 Daughter Card.

The demo software is distributed on a 3.5 inch floppy disk. This folder contains the application and all support files. software will use to communicate with the DEM-DAI1604. your computer’s port address. A window will appear on your screen, as shown in Figure 5. Operational Control, Function Control, and Register Read. registers internal to the PCM1604 and is shown in Figure 6. in decibels (dB) relative to the input signal level. FIGURE 5. Start Up Window. FIGURE 6. Attenuation Window.

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