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LMX2531 High Performance Frequency Synthesizer System with Integrated VCO National-Semiconductor
National ->Texas Instruments National-Semiconductor
LMX2531 Datasheet PDF : 36 Pages
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2.2 REGISTER R1
2.2.1 NUM[21:12]
These are the MSB bits in for the fractional numerator that already have been described.
2.2.2 N[10:8] -- 3 MSB Bits for the N Counter
These are the 2 MSB bits for the N counter, which were discussed in the R0 register section.
2.2.3 ICP[3:0] -- Charge Pump Current
This bit programs the charge pump current in from 90 µA to 1440 µA in 90 µA steps. In general, higher charge pump currents yield
better phase noise for the PLL, but also can cause higher spurs.
ICP
Charge Pump State
Typical Charge Pump Current at 3 Volts
(µA)
0
1X
90
1
2X
180
2
3X
270
3
4X
360
4
5X
450
5
6X
540
6
7X
630
7
8X
720
8
9X
810
9
10X
900
10
11X
990
11
12X
1080
12
13X
1170
13
14X
1260
14
15X
1350
15
16X
1440
23
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