WM8761-EV1M Evaluation Board User Handbook

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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
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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
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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
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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
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WM8761-EV1M
WM8761-EV1B SCHEMATIC
Figure 3 Functional Block Diagram
Figure 4 Digital Input
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WM8761-EV1M
Figure 5 Analog Output
Figure 6 WM8761
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WM8761-EV1M
Figure 7 Power
WM8761-EV1B PCB LAYOUT
Figure 8 Top Layer Silkscreen
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WM8761-EV1M
Figure 9 Top Layer
Figure 10 Bottom Layer
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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
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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
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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.
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. Wolfson products are not authorised for use as critical
components in life support devices or systems without the express written approval of an officer of the company. Life
support devices or systems are devices or systems that are intended for surgical implant into the body, or support or
sustain life, and whose failure to perform when properly used in accordance with instructions for use provided, can be
reasonably expected to result in a significant injury to the user. A critical component is any component of a life support
device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or
system, or to affect its safety or effectiveness.
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 not 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 not responsible nor liable for any such use.
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]
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