BU2618FV Datasheet, PDF (7/8 Pages) Rohm – PLL frequency synthesizer for tuners

Audio ICs
S Frequency counter and unlock detection
(1) When CT = 1: Frequency count and unlock detection are carried out.
BU2618FV
(2) When CT = 0 and GT = 1: Only unlock detection is carried out.
S Explanation of CD
When frequency measurement or unlock detection is fin-
ished, the CD terminal goes to LO to indicate that the
count and unlock detection have finished. It also syn-
chronizes with CK to output counter data. When the next
data is input, it goes to HI.
145