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参数资料
| 型号： | LMX2312U |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | XO, clock |
| 英文描述： | PLLatinum⑩ Ultra Low Power Frequency Synthesizer for RF Personal Communications |
| 中文描述： | PLL FREQUENCY SYNTHESIZER, 1200 MHz, QCC20 |
| 封装： | THIN, CSP-20 |
| 文件页数： | 27/29页 |
| 文件大小： | 662K |
| 代理商： | LMX2312U |
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3.0 Programming Description
(Continued)
3.2.5 FoLD2,1,0
The FoLD2, FoLD1 and FoLD0 are used to select which signal is routed to FoLD pin.
FoLD Output Truth Table
T[14],R[21],R[20]
T[14]
FoLD2
0
0
0
0
1
1
1
1
R[21]
FoLD1
0
0
1
1
0
0
1
1
R[20]
FoLD0
0
1
0
1
0
1
0
1
FoLD Output State
Disabled (TRI-STATE FoLD)
Lock Detect—Analog (Push/Pull), Reference to V
μc
Lock Detect—Analog (Open Drain)
Reset R and N Dividers and TRI-STATE Charge Pump
Lock Detect—Digital (Push/Pull), Reference to V
μC
R COUNTER Output (Push/Pull), Reference to V
μC
N Counter Output (Push/Pull), Reference to V
μC
Reserved (Do Not Use)
3.3 N REGISTER
The N register contains the PWDN (Power-Down), P (Prescaler), NA_CNTR, and NB_CNTR control words. The detailed
descriptions and programming information for each control word is discussed in the following sections.
Register
Most Significant Bit
21
20
SHIFT REGISTER BIT LOCATION
14
13
12
Least Significant Bit
3
2
19
18
17
16
15
11
10
9
8
7
6
5
4
1
Address
Field
0
0
Data Field
N
PWDN
P
B_CNTR[12:0]
A_CNTR[4:0]
1
3.3.1 PWDN
The PWDN control bit along with CP
_TRI control bit is used to power-down the PLL. The LMX2310/1/2/3U can be synchronous
or asynchronous powered down by first setting the CP
_TRI bit and then setting the PWDN bit. To power up from the synchronous
Power-Down mode, the CP
o
_TRI bit will have to be reset to 0.
Power-Down
N[21]
N[21]
PWDN
0
1
1
R[19]
CP
O
_TRI
0
0
1
Operating Mode
Normal Operation
Power-down (Synchronous)
Power-down (Asynchronous)
3.3.2 P
The LMX2310/1/2/3U contains two dual modulus prescalers. The P control bit is used to set the prescaler value.
Prescaler
N[20]
N[20]
Prescaler Value
LMX2310/1/2U
16/17
32/33
Prescaler Value
LMX2313U
8/9
16/17
0
1
PLL Input Frequency
F
IN
>
1.2 GHz
F
IN
≤
1.2 GHz
F
IN
≤
600 MHz
Allowable Prescaler Values
32/33
16/17 or 32/33
8/9 or 16/17
L
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LMX2312USLDX | 制造商:MAJOR 功能描述: |
| LMX2312USLDX/NOPB | 功能描述:IC FREQ SYNTH 1.2GHZ 20LAMTCSP 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:* |
| LMX2313U | 制造商:NSC 制造商全称:National Semiconductor 功能描述:PLLatinum⑩ Ultra Low Power Frequency Synthesizer for RF Personal Communications |
| LMX2313USLDX | 制造商:NSC 制造商全称:National Semiconductor 功能描述:PLLatinum⑩ Ultra Low Power Frequency Synthesizer for RF Personal Communications |
| LMX2313USLDX/NOPB | 功能描述:IC FREQ SYNTH 600MHZ 20LAMTCSP 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:* |
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