Other Parts Discussed in Thread: LMX2572
Tool/software:
Hello,
we are using the LMX2572 as simple frequency converter from 156.25MHz to 161.1328125MHz.
Frequency is not changed during operation. No FSK, ramp or chirp function is used.
The resulting VCO frequency in our configuration is 5156.25MHz.
At the end configuration/programming the VCO calibration is done.
The resulting selected core sometimes is VCO4 and sometimes VCO5.
The variation is not observed on one board during different power/initialization-cycles, but on different boards.
E.g. on one board calibration results in VCO4 on another it is resulting in VCO5.
This is what we are wondering about and would like to have information about.
To our understanding the VCO cores are not fixed to the written fMin and fMax values
in e.g. Table 135 of the datasheet, but are a bit wider and overlapping somehow.
Is this true?
Is it normal to have this different VCO core results?
Could the reason for the different resulting VCO cores for example be the tolerance variation of the tuning components,
the LMX2572 lot or temperature when the initialization is done?
Thank you very much for clarification
Best regards
Christoph
