w WM8725-EV1M WM8725 EVALUATION BOARD USER HANDBOOK INTRODUCTION The WM8725 is high performance Stereo DAC. This evaluation platform and documentation should be used in conjunction with the latest version of the WM8725 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 WM8725 and to allow optimum performance to be measured. GETTING STARTED PACKING LIST The WM8725 Evaluation Kit contains: 1 x WM8725-EV1B Evaluation Board (Labelled WM8725_EV1) 1 x WM8725-EV1M Evaluation Board User Handbook CUSTOMER REQUIREMENTS Minimum equipment requirements are: • D.C. Power supply of +2.7 to +5.5V (See WM8725 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 LTD www.wolfsonmicro.com July 2002, Rev 2.0 Copyright 2002 W olfson Microelectronics Ltd. WM8725-EV1M BOARD FUNCTIONALITY This evaluation platform has been designed as a simple means of evaluating the WM8725 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 WM8725 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 WM8725 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 WM8725 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 Table 1 – Power Connections. 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 WM8725 datasheet for limitations on individual supply voltages. 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 Table 2 – Digital Input connections. Connector Reference Connector Type Signal Reference J12 Phono Connector DIGITAL_COXIAL INPUT (SPDIF) U3 Optical Receiver (TOSLINK) DIGITAL_OPTICAL INPUT (SPDIF) ANALOG OUTPUTS Table 3 – Digital Output Connections. Connector Reference Connector Type Signal Reference J7 Phono Connector VOUTL J15 Phono Connector VOUTR J10 Phono Connector FILT_OUTL J11 Phono Connector FILT_OUTR WOLFSON MICROELECTONICS LTD Rev 2.0, July 2002 2 WM8725-EV1M INTERFACES KEY J1 J2 J3 J4 GND J5 J6 1 GND 2 +5V DVDD +3V TO 5.5V -12V 3 +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 WM8725-EV1B Board Interfaces (Component Side) HEADERS Table 5 WM8725 Headers J13 SIGNAL J8 SIGNAL 1 LRCIN 1 VDD 2 3 DIN BCKIN 2 3 VOUTL MUTE 4 NC 4 NC 5 6 CAP VOUTR 5 6 DEEMPH FORMAT 7 GND 7 MCLK 8 GND 8 GND Table 6 Headers H1 SIGNAL H1 SIGNAL 1 3 SDATA DGND 2 4 DIN DGND 5 MCK 6 MCLK 7 9 DGND FSYNC 8 10 DGND LRCIN 11 DGND 12 DGND 13 15 SCK DGND 14 16 BCKIN DGND WOLFSON MICROELECTONICS LTD Rev 2.0, July 2002 3 WM8725-EV1M LINKS Table 7 Links LINKS LNK1 DESCRIPTION 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 SWITCHES Table 8 Switches SWITCH SW1 WOLFSON MICROELECTONICS LTD SETTING DESCRIPTION 1 2 3 4 CS8414 Normal Audio Port Modes 0 1 0 x IS 1 0 1 x 16 Bit Right Justify 2 Rev 2.0, July 2002 4 WM8725-EV1M BASIC TEST SETUP The setup of the WM8725 device can be altered using the various links on the evaluation board. The 2 following configuration, as shown below in figure 2, sets the digital audio interface mode to I S. It also configures de-emphasis OFF, mute OFF and AC coupled outputs with active filtering. +5V J2 0V J3 J4 GND J6 LNK4 LNK3 +12V J7 1 1 J9 LNK8 LNK1 -12V 1 1 1 J10 1 1 J5 DVDD +3V TO 5.5V SW1 0 +12V GND LNK10 +5V -12V 1 J1 0V J9 +5V J8 J9 J14 J11 U3 1 J12 1 1 LNK2 J13 LNK12 1 H1 DIGITAL AUDIO SOURCE J15 Figure 2 Basic Test Connection Diagram. The hardware settings required for the WM8725 Evaluation board are described in the table below. Table 10 - Basic Test Evaluation Board Hardware settings. 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 WOLFSON MICROELECTONICS LTD Rev 2.0, July 2002 5 WM8725-EV1M WM8725-EV1B SCHEMATIC Figure 3 Functional Block Diagram Figure 4 Digital Input WOLFSON MICROELECTONICS LTD Rev 2.0, July 2002 6 WM8725-EV1M Figure 5 Analog Output Figure 6 WM8725 WOLFSON MICROELECTONICS LTD Rev 2.0, July 2002 7 WM8725-EV1M Figure 7 Power WOLFSON MICROELECTONICS LTD Rev 2.0, July 2002 8 WM8725-EV1M WM8725-EV1B PCB LAYOUT Figure 8 Top Layer Silkscreen Figure 9 Top Layer WOLFSON MICROELECTONICS LTD Rev 2.0, July 2002 9 WM8725-EV1M Figure 10 Bottom Layer WOLFSON MICROELECTONICS LTD Rev 2.0, July 2002 10 WM8725-EV1M WM8725-EV1B BILL OF MATERIAL Table 11 Bill Of Materials 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 W M8725 Stereo DAC U5 1 WOLFSON MICROELECTONICS LTD Rev 2.0, July 2002 11 WM8725-EV1M EVALUATION SUPPORT The aim of this evaluation kit is to help you to become familiar with the functionality and performance of the WM8725 Stereo DAC. If you require more information or require technical support please contact Wolfson Microelectronics Applications group through the following channels: Email: Telephone: 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 WOLFSON MICROELECTONICS LTD Rev 2.0, July 2002 12 WM8725-EV1M IMPORTANT NOTICE Wolfson Microelectronics Ltd (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. WM warrants performance of its products to the specifications applicable at the time of sale in accordance with WM’s standard warranty. Testing and other quality control techniques are utilised to the extent WM deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. In order to minimise risks associated with customer applications, adequate design and operating safeguards must be used by the customer to minimise inherent or procedural hazards. WM assumes no liability for applications assistance or customer product design. WM 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 WM covering or relating to any combination, machine, or process in which such products or services might be or are used. WM’s publication of information regarding any third party’s products or services does not constitute WM’s approval, license, warranty or endorsement thereof. Reproduction of information from the WM web site or datasheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations and notices. Representation or reproduction of this information with alteration voids all warranties provided for an associated WM product or service, is an unfair and deceptive business practice, and WM is neither responsible nor liable for any such use. Resale of WM’s products or services with statements different from or beyond the parameters stated by WM for that product or service voids all express and any implied warranties for the associated WM product or service, is an unfair and deceptive business practice, and WM is neither responsible nor liable for any such use. ADDRESS: Wolfson Microelectronics Ltd 20 Bernard Terrace Edinburgh EH8 9NX United Kingdom Tel :: +44 (0)131 272 7000 Fax :: +44 (0)131 272 7001 Email :: [email protected] WOLFSON MICROELECTONICS LTD Rev 2.0, July 2002 13