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參數(shù)資料
| 型號： | LMX2335USLBX |
| 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, PQCC16 |
| 封裝： | PLASTIC, CSP-16 |
| 文件頁數(shù)： | 39/48頁 |
| 文件大?。?/td> | 3127K |
| 代理商： | LMX2335USLBX |
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2.0 Programming Description
(Continued)
2.4.4 TRI-STATE ID
o
RF2
The TRI-STATE ID
o
RF2 bit allows the charge pump to be switched between a normal operating mode and a high impedance
output state. This happens asynchronously with the change in the TRI-STATE ID
o
RF2 bit.
Furthermore, the TRI-STATE ID
o
RF2 bit operates in conjuction with the PWDN RF2 bit to set a synchronous or an asynchronous
powerdown mode.
RF2 SYNTHESIZER CHARGE PUMP TRI-STATE CURRENT
RF2 R[19]
Control Bit
Register Location
Description
Function
0
1
TRI-STATE ID
o
RF2
RF2 R[19]
RF2 Charge Pump
TRI-STATE Current
RF2 Charge Pump
Normal Operation
RF2 Charge Pump
Output in High
Impedance State
2.5 RF2 N REGISTER
The RF2 N register contains the RF2 N_CNTRA, RF2 N_CNTRB, PRE RF2, and PWDN RF2 control words. The RF2 N_CNTRA
and RF2 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
RF2
N
PWDN
RF2
PRE
RF2
RF2 N_CNTRB[10:0]
RF2 N_CNTRA[6:0]
0
1
2.5.1 RF2 N_CNTRA[6:0]
The RF2 N_CNTRA control word is used to setup the RF2 synthesizer’s A counter. The A counter is a 7-bit swallow counter used
in the programmable feedback divider. The RF2 N_CNTRA control word can be programmed to values ranging from 0 to 127.
RF2 SYNTHESIZER SWALLOW COUNTER (A COUNTER)
RF2 N[2:8]
Divide Ratio
RF2 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
2.5.2 RF2 N_CNTRB[10:0]
The RF2 N_CNTRB control word is used to setup the RF2 synthesizer’s B counter. The B counter is an 11-bit programmable
binary counter used in the programmable feedback divider. The RF2 N_CNTRB control word can be programmed to values
ranging from 3 to 2047.
RF2 SYNTHESIZER PROGRAMMABLE BINARY COUNTER (B COUNTER)
RF2 N[9:19]
Divide
Ratio
RF2 N_CNTRB[10:0]
6
5
0
0
0
0
1
1
10
0
0
1
9
0
0
1
8
0
0
1
7
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
2.5.3 PRE RF2
The RF2 synthesizer utilizes a selectable dual modulus prescaler.
RF2 SYNTHESIZER PRESCALER SELECT
RF2 N[20]
Control Bit
Register Location
Description
Function
0
1
PRE RF2
RF2 N[20]
RF2 Prescaler Select
64/65 Prescaler
Selected
128/129 Prescaler
Selected
L
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相關(guān)代理商/技術(shù)參數(shù) |
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| LMX2335UTM | 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 |
| LMX2335UTM/NOPB | 功能描述:IC FREQ SYNTHESIZER DUAL 16TSSOP RoHS:是 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(yīng)商設(shè)備封裝:* 包裝:* |
| LMX2335UTMX | 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 |
| LMX2336 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Dual Frequency Synthesizer for RF Personal Communications |
| LMX2336 WAF | 制造商:Texas Instruments 功能描述: |
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