- 您现在的位置：买卖IC网 > PDF目录358886 > LMX2335U (National Semiconductor Corporation) PLLatinum Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications PDF资料下载
参数资料
| 型号： | LMX2335U |
| 厂商： | National Semiconductor Corporation |
| 英文描述： | PLLatinum Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications |
| 中文描述： | PLLatinum超低功耗双频率合成射频个人通信 |
| 文件页数： | 39/48页 |
| 文件大小： | 3127K |
| 代理商： | LMX2335U |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页当前第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页
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
www.national.com
39
相关PDF资料 |
PDF描述 |
|---|---|
| LMX2336 | PLLatinum⑩ Low Power Dual Frequency Synthesizer for RF Personal Communications |
| LMX2336LSLB | PLLatinum⑩ Low Power Dual Frequency Synthesizer for RF Personal Communications |
| LMX2336LTM | PLLatinum⑩ Low Power Dual Frequency Synthesizer for RF Personal Communications |
| LMX2336TM | PLLatinum⑩ Dual Frequency Synthesizer for RF Personal Communications |
| LMX2353TMX | PLLatinum⑩ Fractional N Single 2.5 GHz Frequency Synthesizer |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LMX2335U WAF | 制造商:Texas Instruments 功能描述: |
| LMX2335USLBX | 功能描述:IC FREQ SYNTH DUAL 16LAMINATECSP RoHS:否 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:PLLatinum™ 标准包装:39 系列:- 类型:* PLL:带旁路 输入:时钟 输出:时钟 电路数:1 比率 - 输入:输出:1:10 差分 - 输入:输出:是/是 频率 - 最大:170MHz 除法器/乘法器:无/无 电源电压:2.375 V ~ 3.465 V 工作温度:0°C ~ 70°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| LMX2335UTM | 制造商:NSC 制造商全称: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 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:PLLatinum™ 标准包装:39 系列:- 类型:* PLL:带旁路 输入:时钟 输出:时钟 电路数:1 比率 - 输入:输出:1:10 差分 - 输入:输出:是/是 频率 - 最大:170MHz 除法器/乘法器:无/无 电源电压:2.375 V ~ 3.465 V 工作温度:0°C ~ 70°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| LMX2335UTMX | 制造商:NSC 制造商全称:National Semiconductor 功能描述:PLLatinum Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications |
发布紧急采购，3分钟左右您将得到回复。