AK2401 Datasheet, PDF (44/103 Pages) Asahi Kasei Microsystems – Direct Conversion Transceiver

[AK2401]
Unlock -> Lock
No
Unlock(LD pin=”L”)
Lock -> Unlock
Flag=0
No
Phase Error < T/2
Yes
Flag=Flag+1
Flag>N
Yes
Lock(LD pin=”H”)
No
When R=1
Lock(LD pin=”H”)
Flag=0
No
Phase Error > T/2
Yes
Flag=Flag+1
Flag>N
Yes
Unlock(LD pin=”L”)
Unlock -> Lock
Unlock(LD pin=”L”)
Lock -> Unlock
Lock(LD pin=”H”)
Flag=0
Flag=0
No
Phase Error < T
Yes
Flag=Flag+1
No
Phase Error > T
Yes
Flag=Flag+1
No
Flag>N
Yes
Lock(LD pin=”H”)
No
Flag>N
Yes
Unlock(LD pin=”L”)
When R > 1
Figure 27. Flow Chart of PLL Lock Detection Function
017003093-E-00
44
2017/3