Evaluation Kit for CMX990
EV9900A
Addendum
EV9900A PCB serial numbers 198189 to 189203 are supplied configured as follows:
R82 (680R), R85 (470R) and R89 (0R) have been removed to disable the on-board Auxiliary VCO,
R92 has been fitted (0R) to allow an external Auxiliary LO to be applied via J11.
This is due to a problem with the PCB construction that has caused unreliable operation of the Auxiliary
VCO when in transmit using a 90MHz IF. The problem can be avoided by using an external source for the
AUX LO. EV9900A PCB’s with other serial numbers are unaffected.
This does not affect the user's ability to evaluate the CMX990 IC.
The user should apply 180.4MHz at –3dBm for receive and 180MHz at –3dBm for transmit operation to
J11.
© 2007 CML Microsystems Plc
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UM9900A/3
CMLMICRO [ CML MICROCIRCUITS ]
