- 您现在的位置：买卖IC网 > PDF目录358886 > LMX2312U (NATIONAL SEMICONDUCTOR CORP) PLLatinum⑩ Ultra Low Power Frequency Synthesizer for RF Personal Communications PDF资料下载
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： | 25/29页 |
| 文件大小： | 662K |
| 代理商： | LMX2312U |
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页当前第25页第26页第27页第28页第29页
2.0 Power-Down
The LMX2310/1/2/3U are power controlled through logical
control of the CE pin in conjunction with programming of the
PDWN and CPo_TRI bits. A truth table is provided that
describes how the state of the CE pin, the PDWN bit and
CPo_TRI bit set the operating mode of the device. A com-
plete programming description of Power-Down is provided in
Section 3.3.1.
CE
0
1
1
1
X = Don’t Care
When the device enters the power-down mode, the oscillator
buffer, RF prescaler, phase detector, and charge pump cir-
cuits are all disabled. The OSC
IN
, CPo, F
IN
, F
INB
, LD pins
are all forced to a high impedance state. The reference
divider and feedback divider circuits are disabled and held at
3.0 Programming Description
PWDN
X
0
1
1
CPo_TRI
X
0
0
1
Operating Mode
Power-down (Asynchronous)
Normal Operation
Power-down (Synchronous)
Power-down (Asynchronous)
the load point during power-down. When the device is pro-
grammed to normal operation, the oscillator buffer, RF pres-
caler, phase detector, and charge pump circuits are all pow-
ered on. The feedback divider and the reference divider are
held at the load point. This allows the RF prescaler, feedback
divider, reference oscillator, the reference divider and pres-
caler circuitry to reach proper bias levels. After a 1.5 μs
delay, the feedback and reference divider are enabled and
they resume counting in “close” alignment (The maximum
error is one prescaler cycle). The MICROWIRE control reg-
ister remains active and capable of loading and latching in
data while in the power-down mode.
The synchronous power-down function is gated by the
charge pump. When the device is configured for synchro-
nous power-down, the device will enter the power-down
mode upon the completion of the next charge pump pulse
event.
The asynchronous power-down function is NOT gated by the
completion of a charge pump pulse event. When the device
is configured for asynchronous power-down, the part will go
into power-down mode immediately.
3.1 MICROWIRE INTERFACE
The MICROWIRE interface is comprised of a 22-bit shift register and three control registers. The shift register consists of a 20-bit
DATA field and a 2-bit address (ADDR) field as shown below. Data is loaded into the shift register on the rising edges of the
CLOCK signal MSB first. When Latch Enable transitions HIGH, data stored in the shift register is loaded into either the R, N or
T register depending on the state of the ADDR bit. The DATA field assignments for the R, N and T registers are shown in Section
3.1.1.
MSB
LSB
DATA
ADDRESS
21
2
0
ADDR
0
1
2
Target Register
R register
N register
T register
3.1.1 Register Map
Register
Most Significant Bit
21
20
SHIFT REGISTER BIT LOCATION
16
15
14
Least Significant Bit
4
3
19
18
17
13
12
11
10
9
8
7
6
5
2
1
Address
Field
0
Data Field
R
FoLD1
FoLD0
CPo_
TRI
CP0_
4x
PD_
POL
R_CNTR[14:0]
0
0
N
T
PWDN
0
P
0
B_CNTR[12:0]
0
FoLD2
A_CNTR[4:0]
0
1
1
0
0
0
0
0
TO_CNTR[11:0]
L
www.national.com
25
相关PDF资料 |
PDF描述 |
|---|---|
| LMX2314 | 1.2 GHz Frequency Synthesizer for RF Personal Communications |
| LMX2314M | 1.2 GHz Frequency Synthesizer for RF Personal Communications |
| LMX2314MX | 1.2 GHz Frequency Synthesizer for RF Personal Communications |
| LMX2315 | Frequency Synthesizer for RF Personal Communications |
| LMX2315TM | Frequency Synthesizer for RF Personal Communications |
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:* |
发布紧急采购，3分钟左右您将得到回复。