Evaluation Kit User Manual for CMX018

EV0181

© 1999 Consumer Microcircuits Limited

5

UM0181/1

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 EV0181 comes pre-configured for an RF operating frequency of

≈≈ 860MHz. The receiver is

enabled and configured for low LNA gain.

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

Ω input of a Radio

Communications test set, or similar.

Ensure this input level does not exceed the power levels

specified in the target device data sheet.

Apply power to the input supply connector, J3, from a suitable 6-12V dc power supply.

Configure the Radio Communications test set to generate a 1kHz RF modulated input at 860MHz. Set

the power level to -60dBm and modulation level to 100kHz.

RSSI and AUDOUT can be monitored at TP4 and TP10, respectively. Alternatively carrier detect and

data can be monitored at CDN and DATAOPN, TP1 and TP2, respectively.

Using a DVM, monitor the dc voltage at RSSI. Set the RF operating frequency (860 - 935 MHz) by

slowly adjusting the frequency potentiometer, RV1. Adjust RV1 until the dc level at RSSI is maximum.

RV1 may need to be adjusted several times due to drift and settling time of the potentiometer.

The dc voltage measured at RSSI will be typically 0.7V (low gain mode) for an RF input level of

-

60dBm.

The recovered 1kHz tone measured at AUDOUT will be typically 0.5Vrms for a modulation level of

100kHz.

Operate switch SW1:1 to enable the receiver and switch SW1:2 to toggle between high and low LNA

gain modes.

1.3.2

Adjustments

To tune the 10.7MHz quadrature tank circuit slowly turn the capacitor trimmer, CV1.

A new RF operating frequency can be obtained by adjusting the trimmer potentiometer, RV1.