Evaluation Kit for CMX990

EV9900A

© 2007 CML Microsystems Plc

5

UM9900A/3

3.

Quick Start

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

evaluation kit. A more complete description of the kit and its use appears later in this document.

The EV9900A includes a CMX990 device that is described in its own, separate, datasheet.

Accordingly, the user should read the CMX990 datasheet before using the EV9900A.

3.1

Setting-Up

The following procedure is recommended:

1. Connect test leads as required, including the host µController to parallel interface J13.

2. The power amplifier output should be connected to a suitable 50

Ω load.

THE USE OF AN EXTERNAL 50Ω LOAD IS ESSENTIAL TO PREVENT POSSIBLE

DAMAGE TO THE PA STAGE.

3. Power should be applied to the main supply (7.2V nominal).

4. The CMX990 device should be reset by issuing a RESET task to the host µController parallel

interface (using the TASK bits (b3 - b0) of the Command register [address $01]).

5. Power should be applied to the power amplifier supply connector (3.5V).

The board is now ready for operation. An example of typical connections to the EV9900A is

shown in Figure 2.

CMX

990

30dB RF

Attenuator

RF Spectrum

Analyzer

RF Signal

Generator

+7.2V

Power Amplifier +3.5V

Ground

J18

J9

J8

J1

J10

J6

J7

J11

J2

J4

J5

J12

J13

Figure 2 – Typical Connections for EV9900A