Other Parts Discussed in Thread: USB2ANY, CODELOADER, LMX2594EVM, LMX2492
Hello,
I'm having a few fundamental issues with the LMX2492EVM device.
1) After configuring the PLL as shown below and also producing a ramping signal as shown in the "Ramp Calculator" tab, I only ever see an output waveform on the 'scope if I'm simultaneously measuring the input. (The input and output are hooked up to the 'scope via BNC cables). The amplitude of the output/2 signal is on the order of 50 mV while the amplitude of the OSCin is 2 Vpp.
This leads me to believe that the output is some random noise that is a function of the input (since the output, which is continuously hooked up to the 'scope only ever shows a waveform the moment I try to measure the input).
Also, am I missing any simple steps in setting up the device that is making me not read viable outputs?
Here is my procedure for setting up the hardware:
1) Connect a 5V supply to the evaluation module
2) Connect the USB2ANY to the module.
3) Open up Code Loader 4 and click the "Identify" button to ensure proper interface
4) Set up measurement of the input and output (normally OSCin as input, from the signal generator, and RF/2 as the output).
5)
Once all of the steps above are completed, I produce to the following relating to the software:
1) I change the "Reference oscillator" frequency to 10 MHz or 15 MHz so that the VCO output frequency changes to 960 MHz or roughly 1400 MHz respectively.
2) I click on "Update All" in the "Ramp Calculator tab" and set the values to what is shown on the second image, below.
3) I set the signal generator output to a square of frequency 10 or 15 MHz, roughly 2 Vpp.
I can't find any step by step tutorials on this. I am an undergraduate that is just finishing theory classes, with 2 years of experience in the lab. Please help.
