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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)： | 20/22頁 |
| 文件大小： | 253K |
| 代理商： | LMX2542LQX2121 |
2.0 Programming Description
(Continued)
2.4.5 VCO_CUR[1:0] - RF VCO Dynamic Current (R2[9:8])
The VCO_CUR control word is used to set the dynamic current for the RF VCO. A maximum dynamic current is recommended,
and is achieved when VCO_CUR[1:0] word = 11.
VCO_CUR[1:0]
RF VCO Current Magnitude
0
1
0
1
Minimum
Maximum
2.5 R3 REGISTER
The R3 register is used for internal testing of the device and is not intended for customer use. The register address bits are
R3[2:0] = 011. Register R3 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[20:0] FIELD
ADDRESS
[2:0]
FIELD
1
R3
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
0
1
0
0
1
0
0
1
2.6 R4 REGISTER
The R4 register contains the IF_B and IF_Acontrol words. The register address bits are R4[3:0] = 0111. Register R4 is active only
when the SPI_DEF bit in Register R0 is set to 0. Regsiter R4 should only be used to set the IF N counter if the default value is
not desired. 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
MSB
SHIFT REGISTER BIT LOCATION
LSB
DATA[19:0]
ADDRESS
[3:0]
FIELD
R4
0
0
0
0
0
0
0
IF_A
[3:0]
IF_B
[8:0]
0
1
1
1
2.6.1 IF_B[8:0] - IF Synthesizer Programmable Binary Counter (B Counter) (R4[12:4])
The IF_B control word is used to setup the IF synthesizer’s B counter. The B counter is a 9-bit programmable binary counter used
in the programmable feedback divider. The IF_B control word can be programmed to values ranging from 1 to 511. Divide ratios
less than 1 are prohibited.
Divide Ratio
IF_B[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
0
1
1
0
1
0
1
1
2
511
2.6.2 IF_A[3:0] - IF Synthesizer Swallow Counter (A Counter) (R4[16:13])
The IF_A control word is used to setup the IF synthesizer’s A counter. The A counter is a 4-bit swallow counter used in the
programmable feedback divider. The IF_A control word can be programmed to values ranging from 0 to 15.
Divide Ratio
IF_A[3:0]
3
0
0
1
2
0
0
1
1
0
0
1
0
0
1
1
0
1
15
L
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