CDB4384 Evaluation Board for CS4384 Features Description Demonstrates recommended layout and grounding arrangements. CS8416 receives S/PDIF, & EIAJ-340 compatible digital audio. Headers for external audio input for either PCM or DSD. Requires only a digital signal source and power supplies for a complete Digital-to-analog converter system. The CDB4384 evaluation board is an excellent means for quickly evaluating the CS4384 24-bit, 48-pin, 8channel, single-ended D/A converter. Evaluation requires an analog signal analyzer, a digital signal source, a PC for controlling the CS4384 (only required for control port mode), and a power supply. Analog line-level outputs are provided via RCA phono jacks. The CS8416 digital audio receiver IC provides the system timing necessary to operate the digital-to-analog converter and will accept S/PDIF and EIAJ-340-compatible audio data. The evaluation board may also be configured to accept external timing and data signals for operation in a user application during system development. ORDERING INFORMATION CDB4384 Evaluation Board Hardware or Software Board Control Inputs for PCM Clocks and Data CS8416 Digital Audio Interface CS4384 Analog Outputs and Filtering Inputs for DSD Clocks and Data http://www.cirrus.com Copyright (c) Cirrus Logic, Inc. 2005 (All Rights Reserved) JULY '05 DS620DB1 CDB4384 TABLE OF CONTENTS 1. CS4384 DIGITAL TO ANALOG CONVERTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. CS8416 DIGITAL AUDIO RECEIVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3. INPUT FOR CLOCKS AND DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 4. INPUT FOR CONTROL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 5. POWER SUPPLY CIRCUITRY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 6. GROUNDING AND POWER SUPPLY DECOUPLING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 7. ANALOG OUTPUT FILTERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 8. ERRATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 9. SCHEMATICS ............................................................6 LIST OF FIGURES Figure 1. System Block Diagram and Signal Flow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 2. CS4384 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 3. Analog Output Pairs 1 & 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Figure 4. Analog Output Pairs 3 & 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Figure 5. Mute Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Figure 6. CS8416 S/PDIF Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Figure 7. PCM input Header and Muxing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Figure 8. DSD input Header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Figure 9. Control Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Figure 10. Power inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Figure 11. Silkscreen Top. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Figure 12. Top Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Figure 13. Bottom Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 2 DS620DB1 CDB4384 CDB4384 SYSTEM OVERVIEW The CDB4384 evaluation board is an excellent means of quickly evaluating the CS4384. The CS8416 digital audio interface receiver provides an easy interface to digital audio signal sources including the majority of digital audio test equipment. The evaluation board also allows the user to supply external PCM or DSD clocks and data through PCB headers for system development. The CDB4384 uses the CDB4385 as a base PCB board. For this reason, there may be additional circuitry on board which is not populated as it has no function for this device. The CDB4384 schematic has been partitioned into 9 schematics shown in Figures 2 through 10. Each partitioned schematic is represented in the system diagram shown in Figure 1. Notice that the system diagram also includes the interconnections between the partitioned schematics. 1. CS4384 DIGITAL TO ANALOG CONVERTER A description of the CS4384 is included in the CS4384 datasheet. 2. CS8416 DIGITAL AUDIO RECEIVER The system receives and decodes the standard S/PDIF data format using a CS8416 digital audio receiver (Figure 6). The outputs of the CS8416 include a serial bit clock, serial data, left-right clock, and a 128/256 Fs master clock. The CS8416 data format is fixed to IS. The operation of the CS8416 and a discussion of the digital audio interface is included in the CS8416 datasheet. The evaluation board has been designed such that the input can be either optical or coaxial, see Figure 6. However, both inputs cannot be driven simultaneously. Switch position 7 of S1 sets the output MCLK-to-LRCK ratio of the CS8416. This switch should be set to 256 (closed) for inputs Fs 96 kHz and 128 (open) for Fs 64 kHz. The CS8416 must be manually reset using `HW RST' (S2) or through the software when this switch is changed. 3. INPUT FOR CLOCKS AND DATA The evaluation board has been designed to allow interfacing to external systems via headers J11 and J7. Header J11 allows the evaluation board to accept externally generated PCM clocks and data. The schematic for the clock/data input is shown in Figure 7. Switch position 6 of S1 selects the source as either CS8416 (open) or header J11 (closed). Header J7 allows the evaluation board to accept externally generated DSD data and clocks. The schematic for the clock/data input is shown in Figure 8. A synchronous MCLK must still be provided via Header J11. Switch position 8 of S1 selects either PCM (open) or DSD (closed). Please see the CS4384 datasheet for more information. 4. INPUT FOR CONTROL DATA The evaluation board can be run in either a stand-alone mode or with a PC. Stand-alone mode uses the CS4384 in hardware mode and the mode pins are configured using switch positions 1 through 5 of S1. PC mode uses software to setup the CS4384 through IC using the PC's serial port. PC mode is automatically selected when the serial port (RS232 or USB) is attached and the CDB4384 software is running. The latest control software may be downloaded from: www.cirrus.com/msasoftware. Header J15 offers the option for external input of RST and SPITM/IC clocks and data. The board is setup from the factory to use the on-board microcontroller in conjunction with the supplied software. To use an external control DS620DB1 3 CDB4384 source, remove the shunts on J15 and place a ribbon cable so the signal lines are on the center row and the grounds are on the right side. R116 and R119 should be populated with 2 k resistors when using an external IC source which does not already provide pull-ups. 5. POWER SUPPLY CIRCUITRY Power is supplied to the evaluation board by four binding posts (GND, +5V, +12V, and -12V), see Figure 10. The `+5V' terminal supplies VA and the rest of the +5 V circuitry on the board. The +3.3 V circuitry is powered from a regulator. The +2.5 V required for VD is also provided from an on-board regulator. The +5 V supply should be set within the recommended values for VA stated in the CS4384 datasheet. WARNING: Refer to the CS4384 datasheet for maximum allowable voltage levels. Operation outside of this range can cause permanent damage to the device. 6. GROUNDING AND POWER SUPPLY DECOUPLING As with any high-performance converter, the CS4384 requires careful attention to power supply and grounding arrangements to optimize performance. Figure 2 details the connections to the CS4384 and Figures 11, 12, and 13 show the component placement and top and bottom layout. The decoupling capacitors are located as close to the CS4384 as possible. Extensive use of ground plane fill in the evaluation board yields large reductions in radiated noise. 7. ANALOG OUTPUT FILTERING The analog output on the CDB4384 has been designed according to the CS4384 datasheet. This output circuit includes a passive 1-pole, 150 kHz filter with an AC coupled output. CONNECTOR INPUT/OUTPUT SIGNAL PRESENT +5V Input + 5 V power GND Input Ground connection from power supply +12V Input Unused -12V Input Negative supply for the mute circuitry (-5 V to -12 V) S/PDIF IN - J9 Input Digital audio interface input via coax S/PDIF IN - OPT1 Input Digital audio interface input via optical PCM INPUT - J11 Input Input for master, serial, left/right clocks and serial data DSD INPUT - J7 Input Input for DSD serial clock and DSD data OUTA1-B4 Output RCA line level analog outputs Table 1. System Connections 4 DS620DB1 CDB4384 JUMPER / SWITCH PURPOSE POSITION FUNCTION SELECTED J15 Selects source of control data *shunts on Left shunts removed *Control from PC and on-board microcontroller External control input using center and right columns J16 JTAG micro programming - Reserved for factory use only S2 Resets CS8416 and CS4384 The CS8416 must be reset if switch S1 is changed CS4384 mode settings M0M4 1-5 Default: M0, M4 open (HI) M1, M2, M3 closed (LO) Sets clock source 6 Sets clock source for CS4384 *open = RX(CS8416), closed = EXT(J11) Sets MCLK ratio of CS8416 7 Selects 128x (open) or 256x (*closed) MCLK/LRCK ratio output for CS8416 Selects PCM or DSD mode 8 For PCM input set to *Open, for DSD set to Closed S1 Table 2. CDB4384 Jumper Settings *Default Factory Settings. 8. ERRATA CDB4384 rev C. -None at this time. DS620DB1 5 9. Figure 6 on page 11 CS8416 S/PDIF Input PCM Clocks/Data PCM Clocks/Data Figure 7 on page 12 PCM mux M0 - M4 switches (for stand-alone mode) PCM Clocks/Data Figure 9 on page 14 Hardware Control Switches CS8416 clock setting Figure 7 on page 12 PCM source select PCM HEADER DSD input enable 6 DSD clk_enable Figure 2 on page 7 CS4384 I2C/SPI Header Figure 9 on page 14 Serial Control Port DSD HEADER Figure 8 on page 13 DSD Clocks/ Data SCHEMATICS 2 2 2 2 Figure 4 on page 9 A4, B4 Figure 4 on page 9 A3, B3 Figure 3 on page 8 A2, B2 Figure 3 on page 8 A1, B1 Single-Ended Analog Outputs Figure 10 on page 15 Power CDB4384 Figure 1. System Block Diagram and Signal Flow DS620DB1 CDB4384 Figure 2. CS4384 DS620DB1 7 CDB4384 Figure 3. Analog Output Pairs 1 & 2 8 DS620DB1 CDB4384 Figure 4. Analog Output Pairs 3 & 4 DS620DB1 9 CDB4384 Figure 5. Mute Circuits 10 DS620DB1 CDB4384 Figure 6. CS8416 S/PDIF Input DS620DB1 11 CDB4384 Figure 7. PCM input Header and Muxing 12 DS620DB1 CDB4384 Figure 8. DSD Input Header DS620DB1 13 CDB4384 Figure 9. Control Input 14 DS620DB1 CDB4384 Figure 10. Power Inputs DS620DB1 15 CDB4384 Figure 11. Silkscreen Top 16 DS620DB1 CDB4384 Figure 12. Top Side DS620DB1 17 CDB4384 Figure 13. Bottom Side 18 DS620DB1 CDB4384 REVISION HISTORY Release DB1 Date JULY 2005 Changes Initial Release Contacting Cirrus Logic Support For all product questions and inquiries contact a Cirrus Logic Sales Representative. To find the one nearest to you go to www.cirrus.com IMPORTANT NOTICE Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. 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