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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)： | 19/22頁 |
| 文件大?。?/td> | 253K |
| 代理商： | LMX2542LQX2121 |
2.0 Programming Description
(Continued)
2.4 R2 REGISTER
The R2 register contains the IF_EN, IF_CUR, IF_FREQ, OSC_FREQ, and VCO_CUR control words. The register address bits
are R2[1:0] = 10. 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[21:0] FIELD
ADDRESS
[1:0]
FIELD
R2
1
1
0
0
1
0
0
1
0
0
0
0
0
0
VCO_CUR
[1:0]
OSC_
FREQ
IF_FREQ
[1:0]
IF_CUR
[1:0]
IF_
EN
1
0
2.4.1 IF_EN - IF Synthesizer Enable (R2[2])
The IF_EN bit is used to switch the IF synthesizer between a powered up and powered down mode.
Control Bit
Register Location
Description
Function
0
1
IF_EN
R2[2]
IF Synthesizer
Enable
IF Synthesizer
Powered Down
IF Synthesizer Active
2.4.2 IF_CUR[1:0] - IF Synthesizer Charge Pump Current Gain (R2[4:3])
The IF_CUR control word is used to set the IF synthesizer’s charge pump current gain. Four gain levels are available.
IF_CUR[1:0]
IF Synthesizer
Charge Pump Current Gain
(μA)
100
200
300
800
0
0
1
1
0
1
0
1
2.4.3 IF_FREQ[1:0] - IF Synthesizer Fixed Frequency Selection (R2[6:5])
The IF_FREQ control word is used to set the default fixed IF frequency applicable to the specific CDMA system. For LMX2542,
the default fixed IF frequency is 367.20 MHz.
IF_FREQ[1:0]
Fixed IF Frequency
(MHz)
170.76
367.20
440.76
0
0
1
0
1
0
2.4.4 OSC_FREQ - Reference Oscillator Frequency Select (R2[7])
The OSC_FREQ bit is used to select the appropriate reference oscillator frequency.
Control Bit
Register Location
Description
Function
0
1
OSC_FREQ
R2[7]
Reference Oscillator
Select
19.20 MHz
Reference Oscillator
Selected
19.68 MHz
Reference Oscillator
Selected
L
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