Evaluation Kit User Manual for CMX017

EV0171

© 1999 Consumer Microcircuits Limited

5

UM0171/2

1.3

Quick Start

This section provides instructions for users who wish to experiment immediately with the evaluation kit.

A fuller description of the kit and its use appears later in this document.

1.3.1

Setting-Up

The EV0171 comes pre-configured for an RF operating frequency of 860MHz. The output power

at PAOUT, J1, is set to approximately 100mW when terminated with 50

Ω

Ω.

Using suitable coaxial cable and adapters, connect PAOUT, J1, to the 50

Ω input of a Radio

Communications test set, or similar. Ensure this input can accept power levels > +20dBm without

damage. Use an appropriate 50

Ω inline attenuator if necessary.

Connect MODIN, TP1, to the output of a modulation (FM or FSK) source. Ensure the signal level does

not exceed the maximum level specified in device datasheet.

Select the required RF operating frequency (860 - 935 MHz) by setting the frequency potentiometer,

RV2.

Apply power to the input supply connector, J2, from a suitable 6 - 12 V dc power supply.

Operate switches SW1:1 and SW1:2 to enable the PA stage and modulator respectively.

To minimise the regulator (U2) power dissipation whilst operating for long periods with maximum gain,

it is recommended that the input voltage, VIN, is kept below 9V.

1.3.2

Adjustments

To adjust the gain of the CMX017 PA driver slowly turn the trimmer potentiometer, RV1. Using RV1,

the power level at PAOUT can be adjusted by typically 20dB.

A new RF operating frequency can be obtained by adjusting the trimmer potentiometer, RV2.