CREATE TABLE table_13869651_3 (frequency VARCHAR, part_number_s_ VARCHAR)

What is the frequency of the model whose part number is ado520biaa5do?
SELECT frequency FROM table_13869651_3 WHERE part_number_s_ = "ADO520BIAA5DO"
SELECT "frequency" FROM "table_13869651_3" WHERE "ADO520BIAA5DO" = "part_number_s_"