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AK1543 Datasheet, PDF (19/35 Pages) Asahi Kasei Microsystems – 1300MHz Delta-Sigma FractionalSigma -N Frequency Synthesizer | |||
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[AK1543]
10. Register Functional Description
< Address1 : Num >
D19 D18
D[17:0]
00
NUM[17:0]
Note) Writing into address 0x01 is enabled when writing into address 0x02 is performed.
NUM[17:0] : Set the numerator in 2âs complementary representation.
< Address2 : Int >
D19
D[18:15]
0
CP1[3:0]
D[14:0]
INT[14:0]
Address
0001
Address
0010
CP1[3:0]: Sets the current value for the charge pump in normal operation (Charge Pump 1).
The minimum current value for Charge Pump 1 (CP1_min) is determined by the following formula:
CP1_min = 0.285 / Resistance connected to the [BIAS] pin
Charge Pump 1 current = CP1_min x (CP1 setting + 1)
CP1[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
22kâ¦
13.0
25.9
38.9
51.8
64.8
77.7
90.7
103.6
116.6
129.5
142.5
155.5
168.4
181.4
194.3
207.3
Charge Pump 1 current [ïA]
27kâ¦
10.6
21.1
31.7
42.2
52.8
63.3
73.9
84.4
95.0
105.6
116.1
126.7
137.2
147.8
158.3
168.9
33kâ¦
8.6
17.3
25.9
34.5
43.2
51.8
60.5
69.1
77.7
86.4
95.0
103.6
112.3
120.9
129.5
138.2
INT[14:0] : Sets the integer.
MS1206-E-02
19
2013/03
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