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参数资料
| 型号： | LMX2335UTM |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 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, PDSO16 |
| 封装： | PLASTIC, TSSOP-16 |
| 文件页数： | 41/48页 |
| 文件大小： | 3127K |
| 代理商： | LMX2335UTM |
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2.0 Programming Description
(Continued)
2.6.3 ID
o
RF1
The ID
o
RF1 bit controls the RF1 synthesizer’s charge pump gain. Two current levels are available.
RF1 SYNTHESIZER CHARGE PUMP CURRENT GAIN
RF1 R[18]
Control Bit
Register Location
Description
Function
0
1
ID
o
RF1
RF1 R[18]
RF1 Charge Pump
Current Gain
LOW
0.95 mA
HIGH
3.80 mA
2.6.4 TRI-STATE ID
o
RF1
The TRI-STATE ID
RF1 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
RF1 bit.
Furthermore, the TRI-STATE ID
o
RF1 bit operates in conjuction with the PWDN RF1 bit to set a synchronous or an asynchronous
powerdown mode.
RF1 SYNTHESIZER CHARGE PUMP TRI-STATE CURRENT
RF1 R[19]
Control Bit
Register Location
Description
Function
0
1
TRI-STATE ID
o
RF1
RF1 R[19]
RF1 Charge Pump
TRI-STATE Current
RF1 Charge Pump
Normal Operation
RF1 Charge Pump
Output in High
Impedance State
2.7 RF1 N REGISTER
The RF1 N register contains the RF1 N_CNTRA, RF1 N_CNTRB, PRE RF1, and PWDN RF1 control words. The RF1 N_CNTRA
and RF1 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
RF1
N
PWDN
RF1
PRE
RF1
RF1 N_CNTRB[10:0]
RF1 N_CNTRA[6:0]
1
1
2.7.1 RF1 N_CNTRA[6:0]
The RF1 N_CNTRA control word is used to setup the RF1 synthesizer’s A counter. The A counter is a 7-bit swallow counter used
in the programmable feedback divider. The RF1 N_CNTRA control word can be programmed to values ranging from 0 to 127.
RF1 SYNTHESIZER SWALLOW COUNTER (A COUNTER)
RF1 N[2:8]
Divide Ratio
RF1 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 RF1 N_CNTRB[10:0]
The RF1 N_CNTRB control word is used to setup the RF1 synthesizer’s B counter. The B counter is an 11-bit programmable
binary counter used in the programmable feedback divider. The RF1 N_CNTRB control word can be programmed to values
ranging from 3 to 2047.
RF1 SYNTHESIZER PROGRAMMABLE BINARY COUNTER (B COUNTER)
RF1 N[9:19]
Divide
Ratio
RF1 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
L
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| LMX2336 | 制造商:NSC 制造商全称: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: |
| LMX2336L | 制造商:NSC 制造商全称:National Semiconductor 功能描述:PLLatinum⑩ Low Power Dual Frequency Synthesizer for RF Personal Communications |
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