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参数资料
| 型号： | LMX2377UTMX/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： | 30/44页 |
| 文件大小： | 3181K |
| 代理商： | LMX2377UTMX/NOPB |
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2.0 Programming Description (Continued)
2.4 AUXILIARY R REGISTER
The Aux R register contains the Aux R_CNTR, PD_POL Aux, ID
o Aux, and TRI-STATE IDo Aux 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
Aux
R
FoLD0 FoLD2
TRI-
STATE
IDo
Aux
IDo
Aux
PD_
POL
Aux
Aux R_CNTR[14:0]
0
2.4.1 Aux R_CNTR[14:0]
AUXILIARY SYNTHESIZER PROGRAMMABLE REFERENCE DIVIDER (R COUNTER)
Aux R[2:16]
The Aux reference divider (Aux R_CNTR) can be programmed to support divide ratios from 2 to 32767. Divide ratios less than
2 are prohibited.
Divide Ratio
Aux R_CNTR[14:0]
14
13
12
11
10
9876543210
2
000000000000010
3
000000000000011
32767
111111111111111
2.4.2 PD_POL Aux
AUXILIARY SYNTHESIZER PHASE DETECTOR POLARITY
Aux R[17]
The PD_POL Aux bit is used to control the Aux synthesizer’s phase detector polarity based on the VCO tuning characteristics.
Control Bit
Register Location
Description
Function
01
PD_POL Aux
Aux R[17]
Aux Phase Detector
Polarity
Aux VCO Negative
Tuning
Characteristics
Aux VCO Positive
Tuning
Characteristics
Aux VCO Characteristics
20022609
2.4.3 ID
o Aux
AUXILIARY SYNTHESIZER CHARGE PUMP CURRENT GAIN
Aux R[18]
The ID
o Aux bit controls the Aux synthesizer’s charge pump gain. Two current levels are available.
Control Bit
Register Location
Description
Function
01
ID
o Aux
Aux R[18]
Aux Charge Pump
Current Gain
LOW
0.95 mA
HIGH
3.80 mA
LMX2377U
www.national.com
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