參數(shù)資料
型號(hào): LMX2471
廠商: National Semiconductor Corporation
英文描述: 3.6 GHz Delta-Sigma Fractional-N PLL with 1.7 GHz Integer-N PLL
中文描述: 3.6 GHz的Δ-Σ分?jǐn)?shù)N與1.7 GHz的整數(shù)N分頻PLL鎖相環(huán)
文件頁(yè)數(shù): 29/36頁(yè)
文件大?。?/td> 458K
代理商: LMX2471
Programming Description
(Continued)
2.4 R3 REGISTER
REGISTER
23
22
21
20
DATA[19:0] ( Except for the RF_N Register, which is [22:0] )
RF_CPG[3:0]
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
C3
0
C2
1
C1
0
C0
1
R3
0
IF_R[14:0]
2.4.1 IF_R[14:0] -- IF R Divider Value
For the IF R divider, the R value is determined by the IF_R[14:0] bits in the R3 register. The minimum value for IF_R is 3.
R Value
3
...
32767
IF_R[14:0]
0
.
1
0
.
1
0
.
1
0
.
1
0
.
1
0
.
1
0
.
1
0
.
1
0
.
1
0
.
1
0
.
1
0
.
1
0
.
1
1
.
1
1
.
1
2.4.2 RF_CPG -- RF PLL Charge Pump Gain
This is used to control the magnitude of the RF PLL charge pump in steady state operation
RF_CPG[3:0]
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
RF Charge Pump Current (μA)
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
L
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