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參數(shù)資料
| 型號： | LMX2335UTM/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 1200 MHz, PDSO16 |
| 封裝： | PLASTIC, TSSOP-16 |
| 文件頁數(shù)： | 32/48頁 |
| 文件大小： | 3127K |
| 代理商： | LMX2335UTM/NOPB |
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2.0 Programming Description (Continued)
2.4 RF2 R REGISTER
The RF2 R register contains the RF2 R_CNTR, PD_POL RF2, ID
o RF2, and TRI-STATE IDo RF2 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. RF2 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
RF2
R
FoLD0 FoLD2
TRI-
STATE
IDo
RF2
IDo
RF2
PD_
POL
RF2
RF2 R_CNTR[14:0]
0
2.4.1 RF2 R_CNTR[14:0]
RF2 SYNTHESIZER PROGRAMMABLE REFERENCE DIVIDER (R COUNTER)
RF2 R[2:16]
The RF2 reference divider (RF2 R_CNTR) can be programmed to support divide ratios from 3 to 32767. Divide ratios less than
3 are prohibited.
Divide Ratio
RF2 R_CNTR[14:0]
14
13
12
11
10
9876543210
3
000000000000011
4
000000000000100
32767
111111111111111
2.4.2 PD_POL RF2
RF2 SYNTHESIZER PHASE DETECTOR POLARITY
RF2 R[17]
The PD_POL RF2 bit is used to control the RF2 synthesizer’s phase detector polarity based on the VCO tuning characteristics.
Control Bit
Register Location
Description
Function
01
PD_POL RF2
RF2 R[17]
RF2 Phase Detector
Polarity
RF2 VCO Negative
Tuning
Characteristics
RF2 VCO Positive
Tuning
Characteristics
RF2 VCO Characteristics
10136786
2.4.3 ID
o RF2
RF2 SYNTHESIZER CHARGE PUMP CURRENT GAIN
RF2 R[18]
The ID
o RF2 bit controls the RF2 synthesizer’s charge pump gain. Two current levels are available.
Control Bit
Register Location
Description
Function
01
ID
o RF2
RF2 R[18]
RF2 Charge Pump
Current Gain
LOW
0.95 mA
HIGH
3.80 mA
LMX2335U/LMX2336U
www.national.com
38
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