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参数资料
| 型号： | LMX2377UTM/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 2500 MHz, PDSO20 |
| 封装： | PLASTIC, TSSOP-20 |
| 文件页数： | 32/44页 |
| 文件大小： | 3181K |
| 代理商： | LMX2377UTM/NOPB |
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2.0 Programming Description (Continued)
2.5.3 PRE Aux
AUXILIARY SYNTHESIZER PRESCALER SELECT
Aux N[20]
The Aux synthesizer utilizes a selectable dual modulus prescaler.
Control Bit
Register Location
Description
Function
01
PRE Aux
Aux N[20]
Aux Prescaler Select
8/9 Prescaler
Selected
16/17 Prescaler
Selected
2.5.4 PWDN Aux
AUXILIARY SYNTHESIZER POWERDOWN
Aux N[21]
The PWDN Aux bit is used to switch the Aux PLL between a powered up and powered down mode.
Furthermore, the PWDN Aux bit operates in conjuction with the TRI-STATE ID
o Aux bit to set a synchronous or an asynchronous
powerdown mode.
Control Bit
Register Location
Description
Function
01
PWDN Aux
Aux N[21]
Aux Powerdown
Aux PLL Active
Aux PLL Powerdown
2.6 MAIN R REGISTER
The Main R register contains the Main R_CNTR, PD_POL Main, ID
o Main, and TRI-STATE IDo Main control words, in addition
to two bits that compose the F
oLD control word. The detailed description and programming information for each control word is
discussed in the following sections.
Reg. Most Significant Bit
SHIFT REGISTER BIT LOCATION
Least Significant Bit
21
20
19
18
17
16
15
14
13
12
11
10
9876543210
Data Field
Address
Field
Main
R
FoLD1 FoLD3
TRI-
STATE
IDo
Main
IDo
Main
PD_
POL
Main
Main R_CNTR[14:0]
1
0
2.6.1 Main R_CNTR[14:0]
MAIN SYNTHESIZER PROGRAMMABLE REFERENCE DIVIDER (R COUNTER)
Main R[2:16]
The Main reference divider (Main R_CNTR) can be programmed to support divide ratios from 2 to 32767. Divide ratios less than
2 are prohibited.
Divide Ratio
Main R_CNTR[14:0]
14
13
12
11
10
9876543210
2
000000000000010
3
000000000000011
32767
111111111111111
LMX2377U
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