suggestion of LO generator


I am trying   AD9364 custom design. My desire is to decrease minimum frequency input (my goal is 1MHZ ). To do this,  there are two option. First, using upoconverter, others external LO. could you suggest any external LO generator which has range as possible as higher.  Except these two method, is there any method to do it?

Thank you 

editing spelling rules
[edited by: gcetinkaya at 8:24 AM (GMT -4) on 12 Oct 2020]