AK1546 Datasheet, PDF (26/39 Pages) Asahi Kasei Microsystems – 3GHz Low Noise Integer-N Frequency Synthesizer

[AK1546]
TIMER[3:0] : Sets the switchover time for CP2-to-CP1
This is enabled when {FAST[1:0]} is ”11Bin” and {[CPGAIN}=”1”.
The charge pump current is set into value {CP2[2:0]} designate during switchover time. It goes to be
{CP1[2:0]} setting value after the time out.
The following formula shows the relationship between the switchover time and the counter value.
Switchover time = 1/F_PFD × Counter Value
Counter Value = 3 + Timer[3:0] × 4
The following table shows the relationship between counter value and {TIMER[3:0]}.
D12 D11 D10 D9
Function
Remarks
0
0
0
0
3 Counts
0
0
0
1
7 Counts
0
0
1
0
11 Counts
0
0
1
1
15 Counts
0
1
0
0
19 Counts
0
1
0
1
23 Counts
0
1
1
0
27 Counts
0
1
1
1
31 Counts
1
0
0
0
35 Counts
1
0
0
1
39 Counts
1
0
1
0
43 Counts
1
0
1
1
47 Counts
1
1
0
0
51 Counts
1
1
0
1
55 Counts
1
1
1
0
59 Counts
1
1
1
1
63 Counts
MS1388-E-00
26
2012/3