LMX2492EVM: Output Question

Hi Jerry,

The first thing to check is the current consumption. According to the user's guide section 2.2, the current consumption for the board should be about 240mA. You can see if board draws similar amount of current after being configured.

You can power up and power down the device using register control and see if current changes. This can tell you if the board is being communicated to at all. To power up/down the device, go to 'Ticspro' -> 'User controls' (pane on the left) -> POWERDOWN (under 'general section').

Please provide more details as there's not enough information to go on.

Regards,
Hao

Hi Hao,
Thanks for the great support. I have seem the 5V input current from 0.18A to 0.24A, when load the default setting. If I change the POWERDOWN command, the current will reduce to 0.18A. The control should be not a problem. Is there anything I didn't notice?

Hi Jerry,

Have you tried the trouble shooting guide in the EVM user's guide section 7?

Hi Neol,
Yes, I have read the trouble shooting.
I used the 1GHz scope, it can measure the OSCin waveform. Does it can measure RF out/2 SMA connector?
I also tried to set the output to 500MHz, didn't get the waveform.

Hi Jerry,

Please check a few things.

1) You have a valid 100MHz input reference connected (Figure 1-1 of user's guide). Ignore this step if you've not modified the board.
2) You have latest Ticspro installed
3) Go to Ticspro -> Default configuration (in the tool bar) -> load 'OCSin = 100MHz, RFout = 1.8GHz' setting.
4) Toggle the checkbox for 'FCAL_EN'
5) Hit Ctrl + L to load all registers if you'd like to.
6) Check if the green light on the board is on.

Let me know if the green LED is not on.

Regards,
Hao