AK2400 Datasheet, PDF (32/52 Pages) Asahi Kasei Microsystems – High integrated receiver for PMR-LMR

LD=0
Reference clock
PFD clock
VCO divide clock
Phase frequency
detector output
Lock detect result
ï¼´
Invalid _Valid
Valid
Valid
Invalid
Figure 11 Digital Lock Detect
Transition Flow Chart: Unlock State to Lock State
Unlock([LD]=”Low”)
Invalid ^Valid
[AK2400]
Flag=0
No
Phase Error < T
Yes
Flag=Flag+1
No
Flag>63
Yes
Lock([LD]=”High”)
Figure 12-1 Unlock State to Lock State
014008989-E-01
32
2015/4