EV9900 Datasheet, PDF (5/27 Pages) CML Microcircuits – Evaluation Kit

Evaluation Kit for CMX990
EV9900
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 EV9900 includes a CMX990 device that is described in its own, separate, datasheet.
Accordingly, the user should read the CMX990 datasheet before using the EV9900.
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 50Ω 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 EV9900 is shown
in Figure 2.
RF Spectrum
Analyzer
30dB RF
Attenuator
+7.2V
Power Amplifier +3.5V
Ground
J18 J9
J12
J11
J16
J8 J1 J10
J6 J7
CMX
J13
990
J2
J4
J5
RF Signal
Generator
Figure 2 – Typical Connections for EV9900
3.2 Adjustments
None.
© 2005 CML Microsystems Plc
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UM9900/1