I want to use ADF7021 for 2FSK, my data rate is 9.6kbps, this should be ok, but the modulation frequency is only 15MHz,
is it ok?
if ok, how to set such low modulation frequency?
Urgent case, appreciate your reply.
The minimum channel frequency spec is 80 MHz.While you could get the VCO to lock at lower frequencies by choosing a large external vco tank inductor you start to run into issues - from the datasheet:
"Typically, a particular inductor value allows the ADF7021 to function over a range of ±6% of the RF operating frequency. When the RF_DIVIDE_BY_2 bit (R1_DB18) is selected, this range becomes ±3%. At 400 MHz, for example, an operating range of ±24 MHz (that is, 376 MHz to 424 MHz) with a single inductor (VCO range centered at 400 MHz) can be expected."
So if you tune the select the external inductor to lock at 15 MHz (with VCO divide by 2) you could only expect a VCO range of +-450kHz. With part to part, temperature and supply voltage variation this would not lead to a robust system.
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