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參數(shù)資料
| 型號(hào)： | LMX2331USLBX |
| 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, PQCC24 |
| 封裝： | PLASTIC, CSP-24 |
| 文件頁數(shù)： | 35/42頁 |
| 文件大?。?/td> | 3318K |
| 代理商： | LMX2331USLBX |
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2.0 Programming Description
(Continued)
2.4 IF R REGISTER
The IF R register contains the IF R_CNTR, PD_POL IF, ID
IF, and TRI-STATE ID
IF control words, in addition to two bits that
compose the F
LD control word. The detailed descriptions and programming information for each control word is discussed in the
following sections. IF R_CNTR[14:0]
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
IF
R
F
o
LD0 F
o
LD2
TRI-
STATE
ID
o
IF
ID
o
IF
PD_
POL
IF
IF R_CNTR[14:0]
0
0
2.4.1 IF R_CNTR[14:0]
The IF reference divider (IF R_CNTR) can be programmed to support divide ratios from 3 to 32767. Divide ratios less than 3 are
prohibited.
IF SYNTHESIZER PROGRAMMABLE REFERENCE DIVIDER (R COUNTER)
IF R[2:16]
Divide Ratio
IF 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
2.4.2 PD_POL IF
The PD_POL IF bit is used to control the IF synthesizer’s phase detector polarity based on the VCO tuning characteristics.
IF SYNTHESIZER PHASE DETECTOR POLARITY
IF R[17]
Control Bit
Register Location
Description
Function
0
1
PD_POL IF
IF R[17]
IF Phase Detector
Polarity
IF VCO Negative
Tuning
Characteristics
IF VCO Positive
Tuning
Characteristics
IF VCO Characteristics
10136609
2.4.3 ID
o
IF
The ID
o
IF bit controls the IF synthesizer’s charge pump gain. Two current levels are available.
IF SYNTHESIZER CHARGE PUMP CURRENT GAIN
IF R[18]
Control Bit
Register Location
Description
Function
0
1
ID
o
IF
IF R[18]
IF Charge Pump
Current Gain
LOW
0.95 mA
HIGH
3.80 mA
L
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
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| LMX2331USLEX/NOPB | 功能描述:IC FREQ SYNTH DUAL 20LAMUCSP RoHS:是 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:* |
| LMX2331UTM | 功能描述:IC FREQ SYNTHESIZER DUAL 20TSSOP 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:* |
| 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 |
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