1171 EV2 REV2 Example Configurations

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1171-EV2-REV2
Quick Start Guide
DOC TYPE:
EXAMPLE CONFIGURATIONS
BOARD REFERENCE:
1171-EV2-REV2
BOARD TYPE:
Customer Main Board
WOLFSON DEVICE(S):
WM8903
DATE:
July 2014
DOC REVISION:
1.1
INTRODUCTION
The 1171-EV2-REV2 customer evaluation board provides a complete hardware platform for
evaluation of all the mini boards with analogue WM71x0 and digital WM72x0. Configurations covered
are listed below:

Analogue microphone bypass to headphones output (full analogue path)

Analogue microphone recording with ADC.

Analogue microphone loopback via the ADC and DAC with headphone output

Digital Microphone recording with ADC.

Digital microphone loopback via the ADC and DAC with headphone output.

Supports mono or stereo microphones (digital or analogue microphone and not together)

Differential and single ended PGA circuit configuration, volume, boost and mute controls.
This document should be used as a starting point for evaluation of WM7xx0 but it will not cover every
possible configuration.
Assumptions:
1.
The user is familiar with the WM7xx0 boards (see relevant documents below).
2.
The user has set up WISCE as per instructions and is controlling the WM8903.
Related documents:
1.
WM8903_Rev3.1.pdf
2.
WISCE Quick Start Guide.pdf
3.
WM7xx0 example configurations and schematic.
4.
1171-EV2-REV2 Schematic Layout.pdf
WOLFSON MICROELECTRONICS plc
July 2014, Rev 1.1
Copyright 2014 Wolfson Microelectronics plc
1171-EV2-REV2
Customer Information
TABLE OF CONTENTS
INTRODUCTION ............................................................................................................. 1 TABLE OF CONTENTS .................................................................................................. 2 BLOCK DIAGRAM ......................................................................................................... 3 STARTUP ....................................................................................................................... 3 CONNECTION DIAGRAM........................................................................................................... 4 I/O TABLE .................................................................................................................................... 4 TECHNICAL SUPPORT ................................................................................................. 6 IMPORTANT NOTICE .................................................................................................... 7 ADDRESS:................................................................................................................................... 7 w
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Customer Information
BLOCK DIAGRAM
Figure 1 1171-EV2 Block Diagram
STARTUP
The analogue or digital microphones are inserted into the microphone left (J6) and right (J7) slots with
acoustic port hole facing to the edge of the board. The 1171_EV2 Customer Board is powered and
controlled via USB (J2) by a laptop with WISCE Quick Start Panel shown in Figure 2 Quick Start
Panel on WISCE.
Figure 2 Quick Start Panel on WISCE
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1171-EV2-REV2
Customer Information
CONNECTION DIAGRAM
Figure 3 below shows the external connections on the1171-EV2-REV2. Further details can be found
on the schematic layout referenced at the start of the document.
Please refer to the Table 1 for further detail on external I/O connections.
USB
SPDIF input for audio
playback (optional)
SPDIF OUTPUT
for recording
Headphone output
for loopback and
bypass path
Microphone slots for microphone
mini boards, keep acoustic port
hole facing out to the edge
Figure 3 Board Setup
I/O TABLE
SIGNAL
BOARD
REFERENCE
IMPORTANT NOTES
Microphone Input slot
LINPUT1
J6 : PIN1
Analogue microphone input
LINPUT2
J6 : PIN7
Analogue microphone input
DMIC_DAT
Digital Microphone Data, the signal should swing between
DGND and DBVDD.
RINPUT1
J6 : PIN4
J7 : PIN4
J6 : PIN5
J7 : PIN4
J7 : PIN1
Analogue microphone input
RINPUT2
J7 : PIN7
Analogue microphone input
DMIC_CLK
Digital Microphone CLK. The signals should swing
between DGND and DBVDD.
Ground
GND
Common ground, TP1,
TP2, TP6
Common ground plane.
Audio Interface
ADCDAT
H1: PIN 18
MCLK
H1: PIN 14
DACDAT
H1: PIN 10
BCLK
H1: PIN 6
LRCLK
HI : PIN 2
Control and Power
USB
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Customer Information
J2
All audio interface signals should swing between DGND
and DBVDD.
+5V Power and control interface to setup the path
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1171-EV2-REV2
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SIGNAL
BOARD
REFERENCE
IMPORTANT NOTES
Digital Audio
SPDIF IN
U4
Digital Audio for DAC playback and SPDIF MCLK source.
The input format is standard TOSLINK digital interface
commonly available on many sound card or consumer
product. This
SPDIF OUT
U6
Digital Audio for ADC recording of digital or analogue
microphone. The output format is SPDIF and can be
connected to any PC sound card or test equipment which
supports the standard TOSLINK digital interface. This
interface is common on many sound card interfaces.
Line Inputs
LINEL
J4 : PIN 2
LINER
J4 : PIN 3
Optional analogue line input.
Analogue Outputs
HPOUTR
HPOUTL
HPGND
J3 : PIN3
J3 : PIN2
Common ground
Ground referenced headphone output supports the
connection of standard 16 or 32 ohms via the 3.5mm jack
socket, line level loads or test equipment may also be
connected to this output.
Table 1 I/O Configurations
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TECHNICAL SUPPORT
If you require more information or require technical support, please contact the nearest Wolfson
Microelectronics regional office:
http://www.wolfsonmicro.com/contact
or one of our global distributors:
http://www.wolfsonmicro.com/distribution
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1171-EV2-REV2
IMPORTANT NOTICE
Wolfson Microelectronics plc (“Wolfson”) products and services are sold subject to Wolfson’s terms and conditions of sale, delivery
and payment supplied at the time of order acknowledgement.
Wolfson warrants performance of its products to the specifications in effect at the date of shipment. Wolfson reserves the right to
make changes to its products and specifications or to discontinue any product or service without notice. Customers should therefore
obtain the latest version of relevant information from Wolfson to verify that the information is current.
Testing and other quality control techniques are utilised to the extent Wolfson deems necessary to support its warranty. Specific
testing of all parameters of each device is not necessarily performed unless required by law or regulation.
In order to minimise risks associated with customer applications, the customer must use adequate design and operating safeguards
to minimise inherent or procedural hazards. Wolfson is not liable for applications assistance or customer product design. The
customer is solely responsible for its selection and use of Wolfson products. Wolfson is not liable for such selection or use nor for
use of any circuitry other than circuitry entirely embodied in a Wolfson product.
Wolfson’s products are not intended for use in life support systems, appliances, nuclear systems or systems where malfunction can
reasonably be expected to result in personal injury, death or severe property or environmental damage. Any use of products by the
customer for such purposes is at the customer’s own risk.
Wolfson does not grant any licence (express or implied) under any patent right, copyright, mask work right or other intellectual
property right of Wolfson covering or relating to any combination, machine, or process in which its products or services might be or
are used. Any provision or publication of any third party’s products or services does not constitute Wolfson’s approval, licence,
warranty or endorsement thereof. Any third party trade marks contained in this document belong to the respective third party owner.
Reproduction of information from Wolfson datasheets is permissible only if reproduction is without alteration and is accompanied by
all associated copyright, proprietary and other notices (including this notice) and conditions.
Wolfson is not liable for any
unauthorised alteration of such information or for any reliance placed thereon.
Any representations made, warranties given, and/or liabilities accepted by any person which differ from those contained in this
datasheet or in Wolfson’s standard terms and conditions of sale, delivery and payment are made, given and/or accepted at that
person’s own risk. Wolfson is not liable for any such representations, warranties or liabilities or for any reliance placed thereon by
any person.
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
E-mail :: apps@wolfsonmicro.com
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