EV0181

Evaluation Kit

User Manual

© 1999 Consumer Microcircuits Limited

UM0181/1 July 1999

Advance Information

1.0

Features

•• CMX018 Product Demonstration

•• Simple and Easy to Use Controls

•• 860 - 935 MHz Operation

•• Flexible VCO

•• Single 6 - 12 V Power Supply

•• Optional Local Oscillator Input

•• Audio Amplifier and Data Interface

•• Footprint for Front End SAW Filter

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

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.