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參數(shù)資料
| 型號： | LMX2313USLDX/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 600 MHz, QCC20 |
| 封裝： | LEAD FREE, THIN, CSP-20 |
| 文件頁數(shù)： | 19/29頁 |
| 文件大?。?/td> | 662K |
| 代理商： | LMX2313USLDX/NOPB |
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3.0 Programming Description (Continued)
3.2 R REGISTER
The R register contains the R_CNTR control word and PD_POL, CPo_4X, CP_TRI, FoLD0, FoLD1 control bits. The detailed
descriptions and programming information for each control word is discussed in the following sections.
Register Most Significant Bit
SHIFT REGISTER BIT LOCATION
Least Significant Bit
21
20
19
18
17
16
15
14
13
12
11
10
98765432
1
0
Data Field
Address
Field
R
FoLD1
FoLD0
CP
O_
TRI
CP
O_
4X
PD_
POL
R_CNTR[14:0]
0
3.2.1 R_CNTR[14:0]
Reference Divider (R COUNTER)
R[16:2]
The reference divider can be programmed to support divide ratios from 2 to 32,767. Divide ratios of less than 2 are prohibited.
Divider Value
R_CNTR[14:0]
2
000000000000010
3
000000000000011
32,767
111111111111111
3.2.2 PD_POL
Phase Detector Polarity
The PD_POL control bit is used to set the polarity of the phase detector based on the VCO tuning characteristic.
Control Bit Register Location
Description
Function
01
PD_POL
R[17]
Phase Detector Polarity Negative VCO Tuning Characteristic Positive VCO Tuning Characteristic
VCO Characteristics
20043809
3.2.3 CPo_4X
Charge Pump Output Current
R[18]
The CPo_4X control bit allows the charge pump output current magnitude to be switched from 1 mA to 4 mA. This happens
asynchronously or immediately with the change in CPo_4X bit.
Control Bit
Register Location
Description
Function
01
CPo_4X
R[18]
Charge Pump Output Current Magnitude
1X Current
4X Current
3.2.4 CPo_TRI
Charge Pump TRI-STATE
R[19]
The CPo_TRI control bit allows the charge pump to be switched between a normal operating mode and a high impedance output
state. This happens asynchronously or immediately with the change in CPo_TRI bit.
Control Bit
Register Location
Description
Function
01
CPo_TRI
R[19]
Charge Pump TRI-STATE
Charge Pump Operates Normal
Charge Pump Output in High
Impedance State
LMX2310U/LMX231
1U/LMX2312U/LMX2313U
www.national.com
26
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