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WM8738 Evaluation Board User Handbook
INTRODUCTION
GETTING STARTED
PACKING LIST
CUSTOMER REQUIREMENTS
WOLFSON MICROELECTRONICS LTD
www.wolfsonmicro.com
The WM8738 is a 24-bit Stereo ADC.
This evaluation platform and documentation should be used in conjunction with the latest version of
the WM8738 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.
The WM8738 Evaluation Kit Contains:
•
1 WM8738-EV1B Evaluation Board
•
This manual -1 WM8738-EV1M
Minimum Customer Requires:
•
D.C. Power supply of +5V
•
D.C. Power supply of +3.0V to +5.5V
•
D.C. Power supply of +3.0V to +3.6V
•
D.C. Power supply of +12V and -12V
ADC Signal Path Requires (minimum):
•
Analogue coaxial jack plug data source
•
Digital coaxial data receiving unit
•
Master Clock source
WM8738 EV1M
August 2002, Rev 2.1
Copyright 2002 Wolfson Microelectronics Ltd
.
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Summary of Contents for Wolfson WM8738
- Page 1 The WM8738 is a 24-bit Stereo ADC. This evaluation platform and documentation should be used in conjunction with the latest version of the WM8738 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.
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Page 2: Wm8738
(U2) has been included in the audio interface signal path to buffer the input signals when applied via header (H1) and minimise any performance degradation this may cause.. Note: The level shift IC's (U2 and U6) are set to shift from +5V to DVDD when shipped from Wolfson. BOARD OUTPUT The output interface from the board is via a coaxial (J8) digital (AES/EBU, UEC958, S/PDIF, EIAJ CP340/1201) signal output. - Page 3 Figure 1 Interfaces HEADERS SIGNAL SIGNAL WM8738 MCLK DVDD SDOUT SLAVE_LRC BCLK 9/10 SLAVE_BCLK 11/12 VREF SIGNAL AGND 12/11 10/9 SDOUT WM8738 SIGNAL BCLK_OUT AVDD AGND ADC_LRCLK NOHP LRCLK MCLK DGND DGND Table 1 Headers WOLFSON MICROELECTONICS LTD Rev 2.1 August 2002...
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Page 4: Wm8738
The CS8427 may be RESET by pressing and releasing switch SW2. This is required if the switches on SW1 are changed after the board is powered up. MCLK RATE (MCLK RATE) 256fs 384fs 512fs 768fs Table 3 Switches WOLFSON MICROELECTONICS LTD Rev 2.1 August 2002... -
Page 5: Wm8738
WM8738 from another source). There are only 2 pins that can be used to change the setup of the WM8738, these are pin 4 (FMT) and pin 11 (NOHP). 3 pin link switch SW3 is used to control the FMT pin, putting this switch high (short pins 1 &... -
Page 6: Wm8738
WM8738-EV1M An additional feature that has been provided on the WM8738 evaluation board is the ability to run with multi-rate MCLK’s. This is achieved through the use of the CPLD (U1) and the relevant switch setting of SW7. Four MCLK rates are supported, 256fs, 384fs, 512fs and 768fs. To operate the... -
Page 7: Rev 2.1 August
WM8738-EV1M WM8738-EV1B SCHEMATIC Figure 4 Functional Diagram Figure 5 Digital Interface WOLFSON MICROELECTONICS LTD Rev 2.1 August 2002... -
Page 8: Rev 2.1 August
WM8738-EV1M Figure 6 Analogue Input Figure 7 Level Shift / Buffer WOLFSON MICROELECTONICS LTD Rev 2.1 August 2002... -
Page 9: Wm8738
WM8738-EV1M Figure 8 Multi-Rate Generator Figure 9 WM8738 WOLFSON MICROELECTONICS LTD Rev 2.1 August 2002... -
Page 10: Wm8738
WM8738-EV1M Figure 10 Power WOLFSON MICROELECTONICS LTD Rev 2.1 August 2002... -
Page 11: Wm8738
WM8738-EV1M WM8738-EV1B PCB LAYOUT Figure 11 Top Layer Silkscreen Figure 12 Top Layer WOLFSON MICROELECTONICS LTD Rev 2.1 August 2002... -
Page 12: Wm8738
WM8738-EV1M Figure 13 Bottom Layer Figure 14 Bottom Layer Silkscreen WOLFSON MICROELECTONICS LTD Rev 2.1 August 2002... -
Page 13: Wm8738
WM8738-EV1M WM8738-EV1B BILL OF MATERIAL Description REF-DES 10uF 6.3 Dia 2.5 pitch Oscon Through Hole Cap. 16V 20% C4 C6-7 C9 C13 C17 C51 C55-56 1uF 4 Dia 2 pitch Oscon Through Hole Cap. 25V 20% C22 C48 0.01uF 0805 SMD Ceramic Capacitor 50V X7R 0.1uF 0805 SMD Ceramic Capacitor 50V X7R... -
Page 14: Wm8738
The aim of this evaluation kit is to help you to become familiar with the functionality and performance of the WM8738, stereo audio ADC. If you require more information or require technical support please contact Wolfson Microelectronics Applications group through the following channels: Email: apps@wolfsonmicro.com... - Page 15 WM8738-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...
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