AK1541_17 Datasheet, PDF (25/37 Pages) Asahi Kasei Microsystems – 20 to 600Mhz Delta-Sigma Fractional-N Frequency Synthesizer

[AK1541]
FAST[12:0] : Sets the FAST counter value.
A decimal number from 1 to 8191 can be set. This counter value is used to set the time period during
which the charge pump for the Fast Lockup mode is ON.
The charge pump for the Fast Lockup mode is turned OFF after the time period calculated by [this
count value x Phase detector frequency cycle]. 0 cannot be set.
D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Function
0000000000000
0
0000000000001
1 Dec
0000000000010
2 Dec
Remarks
Prohibited
DATA
1 1 1 1 1 1 1 1 1 1 1 0 1 8189 Dec
1 1 1 1 1 1 1 1 1 1 1 1 0 8190 Dec
1 1 1 1 1 1 1 1 1 1 1 1 1 8191 Dec
MS1043-E-05
25
2013/03