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Wolfson WM8766-EV1M User Handbook Manual

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WM8766 Evaluation Board User Handbook
INTRODUCTION
GETTING STARTED
PACKING LIST
CUSTOMER REQUIREMENTS
WOLFSON MICROELECTRONICS plc
www.wolfsonmicro.com
The WM8766 is a 24-bit, 192kHz 6-Channel DAC.
This evaluation platform and documentation should be used in conjunction with the latest version of
the WM8766 datasheet. The datasheet gives device functionality information as well as timing and
data format requirements.
This evaluation platform has been designed to allow the user ease of use and give optimum
performance in device measurement as well as providing the user with the ability to listen to the
excellent audio quality offered by the WM8766.
The WM8766 Evaluation Kit contains:
•
1 WM8766-EV1B Evaluation Board
•
2 WM8766-EV1S 3.5" floppy disks containing control software
•
This manual -1 WM8766-EV1M
Minimum customer requirements are:
•
D.C. Power supply of +12V and -12V
•
D.C. Power supply of +2.7V to +5.5V
•
PC and printer cable (for software control)
Minimum spec requirements are:
•
Win95/98/NT/2000/XP
•
486 Processor
DAC Signal Path Requires:
•
Digital coaxial or optical data source
•
1 set of active stereo speakers
WM8766-EV1M
November 2003, Rev 1.2
Copyright 2003 Wolfson Microelectronics plc

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  • Page 1 The WM8766 Evaluation Kit contains: • 1 WM8766-EV1B Evaluation Board • 2 WM8766-EV1S 3.5” floppy disks containing control software • This manual -1 WM8766-EV1M CUSTOMER REQUIREMENTS Minimum customer requirements are: • D.C. Power supply of +12V and -12V • D.C. Power supply of +2.7V to +5.5V •...

  • Page 2: Board Functionality

    WM8766-EV1M EVALUATION BOARD OPERATION POWER SUPPLIES Using appropriate power leads with 4mm connectors, supplies should be connected as described in Table 1. REF-DES SOCKET NAME SUPPLY DVDD +2.7V to +3.6V AVDD +2.7V to +5.5V -12V -12V +12V +12V DGND AGND...
  • Page 3 WM8766-EV1M INTERFACES VOUT4R VOUT4L VOUT3R VOUT3L VOUT2R VOUT2L LNK1 LNK2 LNK4 LNK5 LNK6 LNK7 Figure 1 Interfaces HEADERS SIGNAL DACDAT DACLRC DACBCLK 9/10 11/12 13/14 DACMCLK_IN 15/16 WM8766 PIN NAME WM8766 PIN NAME MODE TESTREF MCLK VREFN BCLK VREFP LRCLK...

  • Page 4: Analogue Outputs

    WM8766-EV1M LINKS LINKS AND JUMPERS DESCRIPTION LNK1 (Master/Slave) Pins 1 and 2 SHORT – Master Mode Pins 2 and 3 SHORT – Slave Mode LNK2 (Mute) Pins 1 and 2 SHORT – MUTE On Pins 2 and 3 SHORT – MUTE Off LNK4 (MD/DM) Pins 1 and 2 SHORT –...
  • Page 5 WM8766-EV1M WM8766 OPERATION HARDWARE MODE To operate the WM8766 in hardware mode, the jumper on link LNK7 (MODE) must short pins 1 and 2 together. The 3-pin links on the board (LNK1, 2, 4, 5, 6) then become the active source for changing the device functions.

  • Page 6: Software Control

    WM8766-EV1M SOFTWARE CONTROL To operate the WM8766 in SPI (3-wire) software mode, the jumper on link LNK7 (MODE) must short pins 2 and 3 together. The SPI interface then becomes active on device pins 11(ML/I2S), 12(MC/IWL) and 13(MD/DM). The serial interface on the board can be connected to a PC via the printer port or any other standard parallel port.

  • Page 7: Software Operation

    WM8766-EV1M SERIAL INTERFACE SOFTWARE DESCRIPTION SOFTWARE INSTALLATION There are 2 floppy disks supplied with this evaluation kit. To install the software: Insert disk 1 Select the ‘Start’ button on the Windows task bar and the ‘Run…’ option. Type “A:\setup” and then press OK.

  • Page 8: Writing To Registers

    ‘Reset Software Panel Settings’ button should also be pressed. Pressing this button does not write to the device, it only resets the panel settings to their default state. Left clicking on the Wolfson logo will open the PCs default web browser and go top the Wolfson Microelectronics website (‘www.wolfsonmicro.com’).

  • Page 9: Test Setup For Standard Dac Operation

    WM8766-EV1M TEST SETUP FOR STANDARD DAC OPERATION For the standard ‘DAC Setup’ the device is setup to receive data via the SPDIF_In to the DAC, after conversion the DAC outputs to VOUT1/2/3. Table 8 lists the required board settings to allow this signal path to become active in 24-bit, I S input data format.

  • Page 10: Dac Control

    WM8766-EV1M DAC CONTROL Figure 6 DAC Control The DAC Control panel is used to control the many DAC related features of the WM8766. Pressing the ‘DAC Submit’ button will cause the settings shown on this panel to be written to the WM8766. A full device register write is not sent.

  • Page 11: Dac Attenuation Control

    WM8766-EV1M DAC ATTENUATION CONTROL Figure 7 DAC Attenuation Control The DAC Attenuation Control panel is used to control both the digital DAC volume of the WM8766. The volume sliders update in ‘real’ time (i.e. the ‘DAC Attenuation Submit’ button does not have to be pressed to update the output volume level) but will only have an effect on the output if the UPDATEL/R bits are set.

  • Page 12: Wm8766-Ev1B Schematic

    WM8766-EV1M WM8766-EV1B SCHEMATIC Figure 8 Functional Diagram Figure 9 SPDIF Input / Output Interface Rev 1.2 November 2003...
  • Page 13 WM8766-EV1M Figure 10 Software Control Figure 11 Level Shift Rev 1.2 November 2003...
  • Page 14 WM8766-EV1M Figure 12 WM8766 Rev 1.2 November 2003...
  • Page 15 WM8766-EV1M Figure 13 Analogue Output Rev 1.2 November 2003...
  • Page 16 WM8766-EV1M Figure 14 Power Rev 1.2 November 2003...

  • Page 17: Wm8766-Ev1B Pcb Layout

    WM8766-EV1M WM8766-EV1B PCB LAYOUT Figure 15 Top Layer Silkscreen Rev 1.2 November 2003...
  • Page 18 WM8766-EV1M Figure 16 Top Layer Rev 1.2 November 2003...
  • Page 19 WM8766-EV1M Figure 17 Bottom Layer Rev 1.2 November 2003...
  • Page 20 WM8766-EV1M Figure 18 Bottom Layer Silkscreen Rev 1.2 November 2003...

  • Page 21: Wm8766-Ev1B Bill Of Material

    WM8766-EV1M WM8766-EV1B BILL OF MATERIAL DESCRIPTION REFERENCE Phono Socket PCB mount RED J9, J14, J21 Phono Socket PCB mount YELLOW Phono Socket PCB mount WHITE J12, J18, J28 74ALVC164245 16 Bit Dual Supply Bus Transceiver SSO DIL Switch 6-Way Rocker...
  • Page 22 WM8766-EV1M DESCRIPTION REFERENCE 10uF 10V SMD Tantalum Capacitor case A HSMY-C670 0805 SMD Chip LED YELLOW TORX176 Digital Audio Optical Receiver 1x14 2.54mm pitch PCB Pin Header VERTICAL J16, J25 JSK9-16-G0 PCB 1x3 Jumper Switch 0.1" Center-off VERTICAL LNK1, 2, 4, 4, 5, 6, 7 CS8427 96KHz Audio Transceiver WM8766 24-bit;...

  • Page 23: Audio Interface Connections

    WM8766-EV1M APPENDIX EXTERNAL DSP CONNECTION TO THE WM8766-EV1B The WM8766-EV1B evaluation board has been designed to allow it to be easily connected to an external DSP platform with error free operation. The following information is provided to ease the connection process and ensure that all signals sent and received by the WM8766-EV1B are reliable and at the correct voltage levels.
  • Page 24 WM8766-EV1M DACDAT DACMCLK_IN Figure 20 Timing Connections from DSP Platform The digital inputs to the WM8766 have a CMOS threshold (i.e. Logic High (min) = DBVDDx0.7; Logic Low (max) = DBVDDx0.3). These are met directly by the level shift IC outputs.

  • Page 25: Evaluation Support

    The aim of this evaluation kit is to help you to become familiar with the functionality and performance of the WM8766, 6-channel CODEC. If you require more information or require technical support please contact Wolfson Microelectronics Applications group through the following channels: Email: apps@wolfsonmicro.com...

  • Page 26: Important Notice

    WM8766-EV1M IMPORTANT NOTICE Wolfson Microelectronics plc (WM) 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.
  • Page 27 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Cirrus Logic WM8766-6118-DS28-M-S WM8766-6118-DS28-M...

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