Headset Reference Design
nRD24V1
User Guide v1.0
All rights reserved.
Reproduction in whole or in part is prohibited without the prior written permission of the copyright holder.
February 2007
Headset Reference Design v1.0
Contents
1
2
3
3.1
Introduction .................................................................................................4
System Description .....................................................................................5
Hardware description ..................................................................................7
nRD24V1 Radio module ......................................................................7
Audio Codec.....................................................................................7
Micro controller.................................................................................8
Radio circuit .....................................................................................8
Antenna matching network...............................................................8
Power supply....................................................................................8
Programming....................................................................................8
Specifications...................................................................................9
Application board .................................................................................10
Audio interface .................................................................................10
Jumpers ...........................................................................................12
Antenna............................................................................................12
Power supply....................................................................................12
Buttons.............................................................................................13
Programming....................................................................................13
USB dongle..........................................................................................14
USB Interface...................................................................................15
Micro controller.................................................................................15
Radio circuit .....................................................................................15
Power supply....................................................................................15
Programming....................................................................................15
Specifications...................................................................................16
Hardware design guidelines........................................................................17
Headset................................................................................................17
Antenna............................................................................................17
Interfaces .........................................................................................17
Crystals ............................................................................................18
MCU.................................................................................................18
Battery..............................................................................................18
USB dongle..........................................................................................19
Antenna............................................................................................19
MCU.................................................................................................19
Crystals ............................................................................................19
Appendix .....................................................................................................20
Bill Of Materials (BOM) ........................................................................20
Application board schematics ..............................................................23
RF module schematics.........................................................................24
USB dongle schematics.......................................................................25
3.1.1
3.1.2
3.1.3
3.1.4
3.1.5
3.1.6
3.1.7
3.2
3.2.1
3.2.2
3.2.3
3.2.4
3.2.5
3.2.6
3.3
3.3.1
3.3.2
3.3.3
3.3.4
3.3.5
3.3.6
4
4.1
4.1.1
4.1.2
4.1.3
4.1.4
4.1.5
4.2
4.2.1
4.2.2
4.2.3
5
5.1
5.2
5.3
5.4
Revision 1.0
Page 3 of 25
User Guide
1
Introduction
This user guide is for the nRD24V1 headset reference design, a voice quality wireless headset for Voice
over IP (VoIP) applications. The quality of the audio in this design is the same as the audio quality in tele-
phony.
This user guide describes the nRD24V1 system, HW modules and gives guidelines on how to take this ref-
erence design and build it into a headset application for a finished product.
The nRD24V1 consists of a USB dongle and two application boards with a radio module mounted. You can
establish a full duplex voice link between one application board and the USB dongle or between the two
application boards.
Target applications for the nRD24V1 are:
•
•
•
Voice over IP headsets
Short range intercom applications
Toys
Revision 1.0
Page 4 of 25
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