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參數(shù)資料
| 型號(hào)： | LMX2332UTM/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 1200 MHz, PDSO20 |
| 封裝： | 0.173 INCH, PLASTIC, TSSOP-20 |
| 文件頁數(shù)： | 37/49頁 |
| 文件大?。?/td> | 4568K |
| 代理商： | LMX2332UTM/NOPB |
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2.0 Programming Description (Continued)
2.4 IF R REGISTER
The IF R register contains the IF R_CNTR, PD_POL IF, ID
o IF, and TRI-STATE IDo IF control words, in addition to two bits that
compose the F
oLD control word. The detailed descriptions and programming information for each control word is discussed in the
following sections. IF R_CNTR[14:0]
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
IF
R
FoLD0 FoLD2
TRI-
STATE
IDo
IF
IDo
IF
PD_
POL
IF
IF R_CNTR[14:0]
0
2.4.1 IF R_CNTR[14:0]
IF Synthesizer Programmable Reference Divider (R Counter)
IF R[2:16]
The IF reference divider (IF R_CNTR) can be programmed to support divide ratios from 3 to 32767. Divide ratios less than 3 are
prohibited.
Divide Ratio
IF R_CNTR[14:0]
14
13
12
11
10
9876543210
3
000000000000011
4
000000000000100
32767
111111111111111
2.4.2 PD_POL IF
IF Synthesizer Phase Detector Polarity
IF R[17]
The PD_POL IF bit is used to control the IF synthesizer’s phase detector polarity based on the VCO tuning characteristics.
Control Bit
Register Location
Description
Function
01
PD_POL IF
IF R[17]
IF Phase Detector
Polarity
IF VCO Negative
Tuning
Characteristics
IF VCO Positive
Tuning
Characteristics
IF VCO Characteristics
10136609
2.4.3 ID
o IF
IF Synthesizer Charge Pump Current Gain
IF R[18]
The ID
o IF bit controls the IF synthesizer’s charge pump gain. Two current levels are available.
Control Bit
Register Location
Description
Function
01
ID
o IF
IF R[18]
IF Charge Pump
Current Gain
LOW
0.95 mA
HIGH
3.80 mA
LMX2330U/LMX2331U/LMX2332U
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