AK1575 Datasheet, PDF (16/35 Pages) Asahi Kasei Microsystems – Up Converter Mixer with Fractional-N Frequency Synthesizer and VCO

[AK1575]
< Address0x02:Freq2 >
D [18: 16]
CP1[2:0] ： Set the charge pump current for normal status
D [14:12]
CP2[2:0] ： Set the charge pump current for fast lock
CP1 is the charge pump current setting of the normal mode.
CP2 is the charge pump current setting of the fast lock mode
Charge pump current is determined by the following formula.
Charge pump current [A] = Icp_min [A] × (CP1 or CP2 setting value+1)
Icp_min [A] = 8.1 / R [ohm]
R: the resistance value which is connected to [CPBIAS] pin
Charge pump current (typ) unit : μA
CP1[2:0]
R
CP2[2:0] 33kΩ
27kΩ
22kΩ
0
245
300
368
1
491
600
736
2
736
900
1105
3
982
1200
1473
4
1227
1500
1841
5
1473
1800
2209
6
1718
2100
2577
7
1964
2400
2945
D [11:0]
FRAC[11:0]：Fractional Numerator determination
Set the Numerator of Fractional divider.
The allowed range is from 0 to (MOD[11:0] -1).
MS1552-E-00
16
2013/8