參數(shù)資料
型號: LMX2542LQX2121
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: XO, clock
英文描述: PLLatinum Cellular and GPS Frequency Synthesizer System with Integrated VCO
中文描述: PLL FREQUENCY SYNTHESIZER, QCC28
封裝: 5 X 5 MM, 0.75 MM HEIGHT, LLP-28
文件頁數(shù): 21/22頁
文件大?。?/td> 253K
代理商: LMX2542LQX2121
2.0 Programming Description
(Continued)
2.7 R5 REGISTER
The R5 register contains the IF_R control word. The register address bits are R5[4:0] = 01111. Register R5 is active only when
the SPI_DEF bit in Register R0 is set to 0. Regsiter R5 should only be used to set the IF R counter if the default value is not
desired. The detailed description and programming information for this control word is discussed in the following section.
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
MSB
SHIFT REGISTER BIT LOCATION
LSB
DATA[18:0] FIELD
ADDRESS
[4:0]
FIELD
R5
0
0
0
0
0
0
0
0
0
0
IF_R
[8:0]
0
1
1
1
1
2.7.1 IF_R[8:0] - IF Synthesizer Programmable Reference Divider (R5[13:5])
The IF_R control word is used to setup the IF synthesizer’s reference divider. The IF_R control word can be programmed to
values ranging from 2 to 511. Divide ratios less than 2 are prohibited.
Divide Ratio
IF_R[8:0]
4
0
0
1
8
0
0
1
7
0
0
1
6
0
0
1
5
0
0
1
3
0
0
1
2
0
0
1
1
1
1
1
0
0
1
1
2
3
511
2.8 R6 REGISTER
The R6 register is used for internal testing of the device and is not intended for customer use. The register address bits are
R6[5:0] = 011111. Register R6 is active only when the SPI_DEF bit in Register R0 is set to 0.
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
MSB
SHIFT REGISTER BIT LOCATION
LSB
DATA[17:0] FIELD
ADDRESS
[5:0]
FIELD
1
R6
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
0
1
1
1
1
L
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