I have some questions about ADF4001 from my customers.
1. This part has four registers. These are R counter, N counter, Function latch and Initialization latch.
And each register of these has 24-bit length. But DB22 and DB23 are reserved, DON'T CARE.
DB21 is "DON'T CARE", too in the R counter.
In this case, should we write 0 or 1 in DB21, DB22 and DB23 ?
Is it enough that we write from DB0 to DB20 ?
2. The product page of ADF4001 recommends ADF4002 as the alternative parts.
Is it better that we use ADF4002 in the new design ?