EV0181
Evaluation Kit
User Manual
UM0181/1 July 1999
Advance Information
1.0
Features
•
Simple and Easy to Use Controls
•
Flexible VCO
•
Optional Local Oscillator Input
•
Footprint for Front End SAW Filter
•
CMX018 Product Demonstration
•
860 - 935 MHz Operation
•
Single 6 - 12 V Power Supply
•
Audio Amplifier and Data Interface
1.1
Brief Description
The EV0181 Evaluation Kit comprises a single board containing the CMX018 UHF FM/FSK receiver,
frequency potentiometer, VCO tank circuitry, IF filters, 79.3MHz overtone Colpitts crystal oscillator, tuned
10.7MHz quadrature tank circuit, miniature control switches and audio amplifier.
A multi-turn potentiometer allows the user to select an RF operating frequency between 860 - 935 MHz. The
operating bandwidth and centre frequency can be optimised by modifying the VCO tank components.
The board is powered from a single 6 - 12 V dc power supply. Regulation circuitry sets the analog(AV
DD
)
supply for 3V operation. CMX018 supply current may be measured by removing the appropriate jumper.
A low profile 2-way DIL switch controls the device enable and gain select lines.
Links, test points and SMA connector provide access to various points in the circuit.
PCB footprints are provided to allow an external local oscillator to be connected to overcome settling time and
frequency drift due to the frequency control potentiometer.
©
1999
Consumer Microcircuits Limited
CMLMICRO [ CML MICROCIRCUITS ]
