參數(shù)資料
型號: LMX2430TMX
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: XO, clock
英文描述: PLLatinum Dual High Frequency Synthesizer for RF Personal Communications
中文描述: PLL FREQUENCY SYNTHESIZER, 3000 MHz, PDSO20
封裝: PLASTIC, TSSOP-20
文件頁數(shù): 43/49頁
文件大?。?/td> 943K
代理商: LMX2430TMX
2.0 Programming Description
(Continued)
2.7 R3 REGISTER
The R3 register contains the IF_R, IF_CPP, IF_CPG, IF_CPT, and IF_RST control words, in addition to two of the four bits that
compose the MUX control word. The detailed descriptions and programming information for each control word is discussed in the
following sections.
Reg
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
DATA[20:0] FIELD
ADDRESS
[2:0]
FIELD
R3
MUX[1:0]
IF_
RST
IF_
CPT
IF_
CPG
IF_
CPP
IF_R[14:0]
0
1
1
2.7.1 IF_R[14:0] - IF Synthesizer Programmable Reference Divider (R Counter) (R3[17:3])
The IF reference divider (IF_R) can be programmed to support divide ratios from 3 to 32767. Divide ratios less than 3 are
prohibited.
Divide Ratio
IF_R[14:0]
7
0
0
1
14
0
0
1
13
0
0
1
12
0
0
1
11
0
0
1
10
0
0
1
9
0
0
1
8
0
0
1
6
0
0
1
5
0
0
1
4
0
0
1
3
0
0
1
2
0
1
1
1
1
0
1
0
1
0
1
3
4
32767
2.7.2 IF_CPP - IF Synthesizer Phase Detector Polarity (R3[18])
The IF_CPP bit is used to control the IF synthesizer’s phase/ frequency detector polarity based on the VCO tuning characteristics.
Control Bit
Register Location
Description
Function
0
1
IF_CPP
R3[18]
IF Phase/ Frequency
Detector Polarity
IF VCO Negative
Tuning
Characteristics
IF VCO Positive
Tuning
Characteristics
IF VCO Characteristics
20053568
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