I want to use ADF7021-N circuit to design the receiving and generating circuits with frequencies of 149.82 MHZ and 401.9 MHZ. Please give me a circuit diagram.
Using external inductor VCO, it is recommended to use the eval board circuit diagram found in page 22 of ADF7021_Eval_Note_Schematics_BOM.pdf (download and extract this from www.analog.com/.../ADF7021_7021N_Gerber_Sch_BOM.zip).
As per datasheet, external inductor VCO means adding L3 to the circuit.
For 149.82MHz, use L3 of 14nH to 17nH, with the following register settings,
R1_DB25 = 1
R1_DB18 = 1
R1_DB[23:24] = XX
R1_DB[19:22] = 2
For 401.9MHz, use L3 of 6nH to 8nH, with the following register settings,
R1_DB18 = 0
R1_DB[19:22] = 3
Am I correct that you are using external VCO? If not, please reply so.
Download ADF7021_Eval_Note_Schematics_BOM.pdf from https://www.analog.com/media/en/technical-documentation/evaluation-documentation/ADF7021_7021N_Gerber_Sch_BOM.zip
get ,thanks 。Can I just add an L3 to the L2 of ADF7021? Does not the SEV-3V636AP VCO on the Eval Board need to be added?
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