參數(shù)資料
型號(hào)： LMX2331UTM
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, 2000 MHz, PDSO20
封裝： 0.173 INCH, PLASTIC, TSSOP-20
文件頁(yè)數(shù)： 36/42頁(yè)
文件大?。?/td> 3318K
代理商： LMX2331UTM
2.0 Programming Description
(Continued)
2.4.4 TRI-STATE ID
o
IF
The TRI-STATE ID
IF 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
IF bit.
Furthermore, the TRI-STATE ID
o
IF bit operates in conjuction with the PWDN IF bit to set a synchronous or an asynchronous
powerdown mode.
IF SYNTHESIZER CHARGE PUMP TRI-STATE CURRENT
IF R[19]
Control Bit
Register Location
Description
Function
0
1
TRI-STATE ID
o
IF
IF R[19]
IF Charge Pump
TRI-STATE Current
IF Charge Pump
Normal Operation
IF Charge Pump
Output in High
Impedance State
2.5 RF R REGISTER
The RF R register contains the RF R_CNTR, PD_POL RF, ID
o
RF, and TRI-STATE ID
o
RF control words, in addition to two bits
that compose the F
o
LD control word. The detailed descriptions 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
RF
R
F
o
LD1 F
o
LD3
TRI-
STATE
ID
o
RF
ID
o
RF
PD_
POL
RF
RF R_CNTR[14:0]
0
1
2.5.1 RF R_CNTR[14:0]
The RF reference divider (RF R_CNTR) can be programmed to support divide ratios from 3 to 32767. Divide ratios less than 3
are prohibited.
RF SYNTHESIZER PROGRAMMABLE REFERENCE DIVIDER (R COUNTER)
RF R[2:16]
Divide Ratio
RF R_CNTR[14:0]
8
7
0
0
0
0
1
1
14
0
0
1
13
0
0
1
12
0
0
1
11
0
0
1
10
0
0
1
9
0
0
1
6
0
0
1
5
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
32767
2.5.2 PD_POL RF
The PD_POL RF bit is used to control the RF synthesizer’s phase detector polarity based on the VCO tuning characteristics.
RF SYNTHESIZER PHASE DETECTOR POLARITY
RF R[17]
Control Bit
Register Location
Description
Function
0
1
PD_POL RF
RF R[17]
RF Phase Detector
Polarity
RF VCO Negative
Tuning
Characteristics
RF VCO Positive
Tuning
Characteristics
RF VCO Characteristics
10136682
L
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36
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LMX2331UTMX 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
LMX2332 WAF 制造商:Texas Instruments 功能描述:
LMX2332A 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Dual Frequency Synthesizer for RF Personal Communications
LMX2332ATM 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述:
LMX2332ATMX 功能描述:IC FREQ SYNTH DUAL 20-TSSOP RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 時(shí)鐘發(fā)生器，PLL，頻率合成器 系列:PLLatinum™ 標(biāo)準(zhǔn)包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時(shí)鐘 輸出:時(shí)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:*
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