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參數資料
| 型號： | LMX2330UTMX/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 2500 MHz, PDSO20 |
| 封裝： | 0.173 INCH, PLASTIC, TSSOP-20 |
| 文件頁數： | 39/49頁 |
| 文件大小： | 4568K |
| 代理商： | LMX2330UTMX/NOPB |
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2.0 Programming Description (Continued)
2.5.4 PWDN IF
IF SYNTHESIZER POWERDOWN
IF N[21]
The PWDN IF bit is used to switch the IF PLL between a powered up and powered down mode.
Furthermore, the PWDN IF bit operates in conjuction with the TRI-STATE ID
o IF bit to set a synchronous or an asynchronous
powerdown mode.
Control Bit
Register Location
Description
Function
01
PWDN IF
IF N[21]
IF Powerdown
IF PLL Active
IF PLL Powerdown
2.6 RF R REGISTER
The RF R register contains the RF R_CNTR, PD_POL RF, ID
o RF, and TRI-STATE IDo RF 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.
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
RF
R
FoLD1 FoLD3
TRI-
STATE
IDo
RF
IDo
RF
PD_
POL
RF
RF R_CNTR[14:0]
1
0
2.6.1 RF R_CNTR[14:0]
RF Synthesizer Programmable Reference Divider (R Counter)
RF R[2:16]
The RF reference divider (RF R_CNTR) can be programmed to support divide ratios from 3 to 32767. Divide ratios less than 3
are prohibited.
Divide Ratio
RF R_CNTR[14:0]
14
13
12
11
10
9876543210
3
000000000000011
4
000000000000100
32767
111111111111111
2.6.2 PD_POL RF
RF Synthesizer Phase Detector Polarity
RF R[17]
The PD_POL RF bit is used to control the RF synthesizer’s phase detector polarity based on the VCO tuning characteristics.
Control Bit
Register Location
Description
Function
01
PD_POL RF
RF R[17]
RF Phase Detector
Polarity
RF VCO Negative
Tuning
Characteristics
RF VCO Positive
Tuning
Characteristics
RF VCO Characteristics
10136682
LMX2330U/LMX2331U/LMX2332U
www.national.com
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LMX2331 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Low Power Dual Frequency Synthesizer for RF Personal Communications |
| LMX2331 WAF | 制造商:Texas Instruments 功能描述: |
| LMX2331A | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Dual Frequency Synthesizer for RF Personal Communications |
| LMX2331ATM | 制造商:Texas Instruments 功能描述: |
| LMX2331ATMX | 功能描述:IC FREQ SYNTH DUAL 20-TSSOP RoHS:否 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:PLLatinum™ 標準包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時鐘 輸出:時鐘 電路數:1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無/無 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:* 封裝/外殼:* 供應商設備封裝:* 包裝:* |
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