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參數(shù)資料
| 型號： | LMX2332USLBX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | PLLatinum Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications |
| 中文描述： | PLL FREQUENCY SYNTHESIZER, 1200 MHz, PQCC24 |
| 封裝： | PLASTIC, CSP-24 |
| 文件頁數(shù)： | 38/42頁 |
| 文件大?。?/td> | 3318K |
| 代理商： | LMX2332USLBX |
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2.0 Programming Description
(Continued)
2.6.3 PRE IF
The IF synthesizer utilizes a selectable dual modulus prescaler.
IF SYNTHESIZER PRESCALER SELECT
IF N[20]
Control Bit
Register Location
Description
Function
0
1
PRE IF
IF N[20]
IF Prescaler Select
8/9 Prescaler
Selected
16/17 Prescaler
Selected
2.6.4 PWDN IF
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.
IF SYNTHESIZER POWERDOWN
IF N[21]
Control Bit
Register Location
Description
Function
0
1
PWDN IF
IF N[21]
IF Powerdown
IF PLL Active
IF PLL Powerdown
2.7 RF N REGISTER
The RF N register contains the RF N_CNTRA, RF N_CNTRB, PRE RF, and PWDN RF control words. The RF N_CNTRA and RF
N_CNTRB control words are used to setup the programmable feedback divider. The detailed description and programming
information for each control word is discussed in the following sections.
Reg. Most Significant Bit
21
20
SHIFT REGISTER BIT LOCATION
13
12
11
10
Least Significant Bit
3
2
19
18
17
16
15
14
9
8
7
6
5
4
1
0
Data Field
Address
Field
RF
N
PWDN
RF
PRE
RF
RF N_CNTRB[10:0]
RF N_CNTRA[6:0]
1
1
2.7.1 RF N_CNTRA[6:0]
The RF N_CNTRA control word is used to setup the RF synthesizer’s A counter. The A counter is a 7-bit swallow counter used
in the programmable feedback divider. The RF N_CNTRA control word can be programmed to values ranging from 0 to 127.
RF SYNTHESIZER SWALLOW COUNTER (A COUNTER)
RF N[2:8]
Divide Ratio
RF N_CNTRA[6:0]
3
0
0
1
6
0
0
1
5
0
0
1
4
0
0
1
2
0
0
1
1
0
0
1
0
0
1
1
0
1
127
2.7.2 RF N_CNTRB[10:0]
The RF N_CNTRB control word is used to setup the RF synthesizer’s B counter. The B counter is an 11-bit programmable binary
counter used in the programmable feedback divider. The RF N_CNTRB control word can be programmed to values ranging from
3 to 2047.
RF SYNTHESIZER PROGRAMMABLE BINARY COUNTER (B COUNTER)
RF N[9:19]
Divide
Ratio
RF N_CNTRB[10:0]
5
0
0
1
10
0
0
1
9
0
0
1
8
0
0
1
7
0
0
1
6
0
0
1
4
0
0
1
3
0
0
1
2
0
1
1
1
1
0
1
0
1
0
1
3
4
2047
L
www.national.com
38
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相關代理商/技術參數(shù) |
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| LMX2332USLEX | 功能描述:IC FREQ SYNTH DUAL 20LAMUCSP 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(shù):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:* |
| LMX2332UTM | 功能描述:IC FREQ SYNTHESIZER DUAL 20TSSOP 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(shù):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:* |
| LMX2332UTMX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications |
| LMX2334ATMX | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LMX2335 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Dual Frequency Synthesizer for RF Personal Communications |
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