w WM8761-EV1M WM8761 Evaluation Board User Handbook INTRODUCTION The WM8761 is a 24-bit 192kHz Stereo DAC. This evaluation platform and documentation should be used in conjunction with the latest version of the WM8761 datasheet. The datasheet gives device functionality information as well as timing and data format requirements. This evaluation platform has been designed to make it easy to gain familiarity with the WM8761 and to allow optimum performance to be measured. GETTING STARTED PACKING LIST The WM8761 Evaluation Kit contains: 1 x WM8761-EV1B Evaluation Board (Labelled WM8761_EV1) 1 x WM8761-EV1M Evaluation Board User Handbook CUSTOMER REQUIREMENTS Minimum Equipment Requires: • D.C. Power supply of +2.7 to +5.5V (See WM8761 Datasheet for details) • D.C. Power supply of +5V. • D.C. Power supply of +/- 12V Digital Input Signal Path Requires: • Digital coaxial or optical data source Analog Output Path Requires: • Two Audio receivers, for LEFT and RIGHT outputs. WOLFSON MICROELECTRONICS plc www.wolfsonmicro.com July 2004, Rev 1.1 Copyright 2004 Wolfson Microelectronics plc WM8761-EV1M BOARD FUNCTIONALITY This evaluation platform has been designed as a simple means of evaluating the WM8761 24-bit 192kHz Stereo DAC in a 14-pin SOIC package. It is versatile and can be configured for most applications. There are two options for inputting digital data into the WM8761 evaluation board. There is a coaxial input (J12) via a standard phono connector or an optical input (U3) via a standard optical receiver module. A direct digital input is available via one side of a 2x8 pin header (H1). The outputs from the WM8761 are analog Left and Right stereo signals. These analog signals can be passed through active low pass filters before being made accessible via standard phono connectors; J10 (FILT_OUTL) and J11 (FILT_OUTR). Alternatively, non-filtered outputs can be made accessible via standard phono connectors; J7 (VOUTL) and J15 (VOUTR). All WM8761 device pins are accessible for easy measurement via two 1x8pin headers (J8 and J13) running up each side of the device. PCB MAIN CONNECTIONS POWER SUPPLIES CONNECTOR REFERENCE CONNECTOR TYPE SIGNAL REFERENCE VOLTAGE LEVEL * J1 4mm Panel Socket +5V 5 VDC J2 4mm Panel Socket GND 0 VDC J3 4mm Panel Socket DVDD 2.7 to 5.5 VDC J4 4mm Panel Socket GND 0 VDC J5 4mm Panel Socket -12V -12 VDC J6 4mm Panel Socket +12V 12 VDC * Refer to the WM8761 datasheet for limitations on individual supply voltages. Table 1 Power Connections Using appropriate power leads with 4mm connectors, +2.7V to +5.5V should be applied to the DVDD panel socket J3. 5V should be applied to panel socket J1. +12V should be applied to panel socket J6 while -12V should be applied to panel socket J5. GND should be connected to panel sockets J2 and J4. DIGITAL INPUTS CONNECTOR REFERENCE CONNECTOR TYPE SIGNAL REFERENCE J12 Phono Connector DIGITAL_COXIAL INPUT (SPDIF) U3 Optical Receiver (TOSLINK) DIGITAL_OPTICAL INPUT (SPDIF) Table 2 Digital Input Connections ANALOG OUTPUTS CONNECTOR REFERENCE CONNECTOR TYPE SIGNAL REFERENCE J7 Phono Connector VOUTL J15 Phono Connector VOUTR J10 Phono Connector FILT_OUTL J11 Phono Connector FILT_OUTR Table 3 Digital Output Connections w Rev 1.1 July 2004 2 WM8761-EV1M INTERFACES KEY J1 J2 J3 J5 J4 J6 1 GND GND 2 +5V DVDD +3V TO 5.5V 3 +12V -12V 4 J7 LNK3 6 7 LNK4 SW1 LNK1 LNK10 5 8 J10 1 LNK8 1 1 1 1 J9 1 3 2 4 5 1 J8 J9 1 1 0 J9 J11 7 6 8 9 11 13 10 12 14 15 16 J14 1 2 U3 H1 LNK2 1 J12 1 LNK12 1 J13 1 1 2 3 J15 Figure 1 WM8761-EV1B Board Interfaces (Component Side) HEADERS J13 SIGNAL J8 SIGNAL 1 2 LRCIN DIN 1 2 VDD VOUTL 3 4 5 BCKIN NC CAP 3 4 5 MUTE NC DEEMPH 6 7 8 VOUTR GND GND 6 7 8 FORMAT MCLK GND Table 4 WM8761 Headers H1 SIGNAL H1 SIGNAL 1 3 SDATA DGND 2 4 DIN DGND 5 7 9 MCK DGND FSYNC 6 8 10 MCLK DGND LRCIN 11 13 15 DGND SCK DGND 12 14 16 DGND BCKIN DGND Table 5 Headers w Rev 1.1 March 2004 3 WM8761-EV1M LINKS LINKS DESCRIPTION LNK1 1-2 De-emphasis ON 2-3 De-emphasis OFF LNK2 Not Populated LNK3 1-2 Mute ON 2-3 Mute OFF LNK4 Not Populated LNK8 OPEN - VOUTL AC Coupled SHORT - VOUTL DC Coupled LNK10 1-2 I2S or DSP 'early' mode 2-3 16-Bit Right Just. or DSP 'late' mode. LNK12 OPEN - VOUTR AC Coupled SHORT - VOUTR DC Coupled J9 1-2 Unfiltered VOUTL 2-3 Filtered VOUTL J14 1-2 Unfiltered VOUTR 2-3 Filtered VOUTR Table 6 Links SWITCHES SWITCH SW1 SETTING DESCRIPTION 1 2 3 4 CS8414 Normal Audio Port Modes 0 1 0 x I 2S 1 0 1 x 16 Bit Right Justify Table 7 Switches w Rev 1.1 July 2004 4 WM8761-EV1M BASIC TEST SETUP The setup of the WM8761 device can be altered using the various links on the evaluation board. The following configuration, as shown below in Figure 2, sets the digital audio interface mode to I2S. It also configures de-emphasis OFF, mute OFF and AC coupled outputs with active filtering. 0V J3 DVDD +3V TO 5.5V LNK1 LNK4 LNK3 1 1 1 +12V J7 J9 1 J10 1 1 -12V 1 SW1 0 J6 GND LNK10 +5V +12V J5 J4 GND -12V LNK8 J2 +5V 1 J1 0V J9 +5V J8 J9 J14 J11 U3 J12 1 LNK12 1 J13 1 LNK2 1 H1 DIGITAL AUDIO SOURCE J15 Figure 2 Basic Test Connection Diagram The hardware settings required for the WM8761 Evaluation board are described in the table below. LINKS & SWITCHES DESCRIPTION H1 Add 8 Links as shown in figure 11 SW1 Set to 0100 for I2S Mode LNK1 Add Link 2-3 LNK3 Add Link 2-3 LNK9 Add Link 2-3 LNK10 Add Link 1-2 LNK14 Add Link 2-3 Table 8 Basic Test Evaluation Board Hardware Settings w Rev 1.1 March 2004 5 WM8761-EV1M WM8761-EV1B SCHEMATIC Figure 3 Functional Block Diagram Figure 4 Digital Input w Rev 1.1 July 2004 6 WM8761-EV1M Figure 5 Analog Output Figure 6 WM8761 w Rev 1.1 March 2004 7 WM8761-EV1M Figure 7 Power WM8761-EV1B PCB LAYOUT Figure 8 Top Layer Silkscreen w Rev 1.1 July 2004 8 WM8761-EV1M Figure 9 Top Layer Figure 10 Bottom Layer w Rev 1.1 March 2004 9 WM8761-EV1M WM8761-EV1B BILL OF MATERIAL DESCRIPTION REFERENCE QUANTITY Phono Socket PCB mount RED J11, J15 2 Phono Socket PCB mount YELLOW J12 1 Phono Socket PCB mount WHITE J7, J10 2 DIL Switch 4-Way Rocker SW1 1 1.32mm PCB Test Terminal BLACK TP1 – TP6 6 220pF 0805 SMD Ceramic Capacitor 50V X7R C16, C35 2 0.01uF 0805 SMD Ceramic Capacitor 50V X7R C30 1 0.1uF 0805 SMD Ceramic Capacitor 50V X7R C1 – C4, C9, C10, C19, C21, C23 – C27, C29 14 MM74HC32 Quad 2-input OR gate SO U2 1 4mm Non-Insulated Panel Socket 16A J1 – J6 6 1x2 PCB Pin Header 0.1" VERTICAL LNK8, LNK12 2 1x3 PCB Pin Header 0.1" VERTICAL J9, J14, LNK3 3 1x8 2.54mm pitch PCB Pin Header VERTICAL J8, J13 2 2x8 2.54mm pitch PCB Pin Header VERTICAL H1 1 MC33078 Low Noise Dual Op-Amp SO U6 1 0.068uF 0805 SMD Ceramic Capacitor 25V X7R C20 1 10uF 6.3 Dia 2.5 pitch Oscon Through Hole Cap. 16V 20% C5 – C8, C11, C13, C18, C32, C36 9 DS1812 5V Power-On-Reset chip SOT U1 1 680pF 0805 SMD Ceramic Capacitor 50V NPO C14, C33 2 1nF 0805 SMD Ceramic Capacitor 50V NPO C15, C34 2 0R 0805 SMD chip resistor 1% 0.1W R7, R26 2 0R 1206 Resistor on 1210 Inductor site L1 - L4 4 470R 0805 SMD chip resistor 1% 0.1W R16 1 1K8 0805 SMD chip resistor 1% 0.1W R9, R22 2 4K7 0805 SMD chip resistor 1% 0.1W R2, R3, R6, R11, R14, R18, R24 7 47K 0805 SMD chip resistor 1% 0.1W R8, R21 2 100K 0805 SMD chip resistor 1% 0.1W R1, R4, R5 3 49R9 0805 SMD chip resistor 1% 0.125W R12, R25 2 7K5 0805 SMD chip resistor 1% 0.125W R10, R23 2 47uH 1210 Surface Mount Inductor 'PA series' L5 1 Hexagonal brass M3 size spacer 20mm length P1 - P4 4 75R 0805 SMD chip resistor 1% 0.125W R20 1 Plain M3 size washer W1 - W2 4 Slotted Panhead Screw - M3 thread; 12mm long SC1 - SC4 4 CS8414 96kHz Digital Audio Receiver SO U4 1 TORX176 Digirtal Audio Optical Receiver U3 1 JSK9-16-G0 PCB 1x3 Jumper Switch 0.1" Center-off VERTICAL LNK1, LNK10 2 WM8761 Stereo DAC U5 1 Table 9 Bill of Material w Rev 1.1 July 2004 10 WM8761-EV1M EVALUATION SUPPORT The aim of this evaluation kit is to help you to become familiar with the functionality and performance of the WM8761 Stereo DAC. If you require more information or require technical support please contact Wolfson Microelectronics Applications group through the following channels: Email: Telephone Apps: Fax: Mail: [email protected] (+44) 131 272 7070 (+44) 131 272 7001 Applications at the address on last page. or contact your local Wolfson representative. Additional information may be made available from time to time on our web site at: http://www.wolfsonmicro.com w Rev 1.1 March 2004 11 WM8761-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. All products are sold subject to the WM terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. 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ADDRESS: Wolfson Microelectronics plc Westfield House 26 Westfield Road Edinburgh EH11 2QB United Kingdom Tel :: +44 (0)131 272 7000 Fax :: +44 (0)131 272 7001 Email :: [email protected] w Rev 1.1 July 2004 12