AK1590 Datasheet, PDF (25/36 Pages) Asahi Kasei Microsystems – 1GHz Delta-Sigma Fractional-N Frequency Synthesizer

[AK1590]
FAST[12:0] : Set 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 × the reference clock cycle”. 0 cannot be set.
D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Function Remarks
0
0
0 0000000000
0
Prohibited
0
0
0 0000000001
1
0
0
0 0000000010
2
DATA
1
1
1 1111111101
8189
1
1
1 1111111110
8190
1
1
1 1111111111
8191
MS1478-E-01
25
2013/2