We designed a PCB for @HMC821 frequency synthesizer as much as similar to the one depicted in the datasheet of HMC821. and we load registers as below to obtain 1900MHz RF at the output
reg02 : 00000001
but we obtain in spectrum three different frequencies at approxiametly 900MHz, 1821 MHz ,and 2700MHz, although it says LOCKED.
We couldn't find what can cause this.
is it possible to find source code ?
We also have the eval board of the HMC821 but we are not able to set frequency via its interface when we use an external reference frequency of 10 MHz. I think it works only with 50 MHz reference, which is on the board.
We would appreciate if you suggest.