CML Microcircuits
COMMUNICATION SEMICONDUCTORS
UM6491/1 April 2004
DE6491
CMX649 Wireless Voice Link
Demonstration Kit
User Manual
Advance Information
Features
•
Full-Duplex Wireless Voice-Link
Communication Demonstration
using the CMX649 ADM Voice
Codec
Operates in the 863 – 865 MHz
European Licence Free Band
20m Range - Line of Sight
•
•
•
•
Privacy via CMX649 Digital Scrambler
On/Off, Volume and RF Channel Pushbutton
Controls
Phone Quality Voice Transmission using Time
Division Duplex (TDD) Airlink Protocol
Selectable RF Power
•
•
1.
Brief Description
The DE6491 is a CMX649-based wireless voice link demonstration kit that demonstrates CMX649 ADM
Codec IC operation in a low-power, cordless headset application. Operating as a short range RF device
in the 863 – 865 MHz European licence-exempt band, this demonstration kit consists of two separate
stand-alone PCBs each with the following sections: CMX649-based audio, RF transceiver and control.
The basic design may be user adapted to other RF frequencies. Full-duplex voice operation at up to 20
metres range is provided via a single RF channel Time Division Duplex (TDD) link. With the supplied
headsets a user can investigate two-way voice-audio transfer between units.
Each PCB can be powered, standalone, from a choice of AAA batteries or a bench power supply.
Intelligent power saving reduces supply current when not communicating. Each terminal draws between
17 – 25.5 mA when communicating or 850µA, typical, when powersaved.
Each on-board µController's FLASH memory comes programmed with the latest version of operating
firmware. If desired, a user may reprogram and in-circuit debug the µController themselves, using a
proprietary programmer (not included).
2004 CML Microsystems Plc
CMLMICRO [ CML MICROCIRCUITS ]
