AK1547 Datasheet, PDF (25/37 Pages) Asahi Kasei Microsystems – 4GHz Low Noise Integer-N Frequency Synthesizer

[AK1547]
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
FAST[1:0] : Enables or disables the Fast Lock mode
When {FAST[1:0]} is ”11Bin”, {CPGAIN} of function latch is the Fast Lock mode bit. When Fast Lock is
enabled, charge pump current is set to the value of {CP2} setting during the switchover time under the
control of the timer counter. After the timeout, {CPGAIN} is reset into “0” and charge pump current goes
to be {CP1} setting value.
D8 D7 {CPGAIN}
0
X0
1
0
01
1
0
11
1
Function
CP1 is enabled
CP2 is enabled
CP1 is enabled
CP2 is enabled
CP1 is enabled
CP2 is enabled during
switchover time
Remarks
Fast Lock Up Mode. {CPGAIN}
is reset to “0” after timeout.
MS1464-E-00
25
2012/9