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參數(shù)資料
型號(hào): LMX2531LQ2570E
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: XO, clock
英文描述: PLLatinum High Performance Frequency Synthesizer System with Integrated VCO
中文描述: PLL FREQUENCY SYNTHESIZER, 80 MHz, QCC36
封裝: 6 X 6 MM, 0.80 MM HEIGHT, LEAD FREE, LLP-36
文件頁數(shù): 15/25頁
文件大小: 589K
代理商: LMX2531LQ2570E
2.0 General Programming Information
(Continued)
2.2 REGISTER R1
2.2.1 NUM[21:12]
These are the MSB bits in for the fractional numerator that already have been described.
2.2.2 N[10:8] -- 3 MSB Bits for the N Counter
These are the 2 MSB bits for the N counter, which were discussed in the R0 register section.
2.2.3 ICP[3:0] -- Charge Pump Gain
This bit programs the charge pump current when the charge pump gain. The current is programmable between 100uAand 1.6mA
in 100uA steps. In general, higher charge pump currents yield better phase noise for the PLL, but also can cause higher spurs.
ICP
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Charge Pump State
1X
2X
3X
4X
5X
6X
7X
8X
9X
10X
11X
12X
13X
14X
15X
16X
Typical Charge Pump Current at 3 Volts (μA)
95
180
285
380
475
970
665
760
855
950
1045
1140
1235
1330
1425
1520
2.2.4 PRESC16 -- PLL Prescaler
PRESC16
0
1
Prescaler
8/9/12/13
16/17/20/21
Minimum Continuous Divide Ratio
31
55
Maximum VCO Frequency
(Before the Divider by 2)
1.2 GHz
3.0 GHz
L
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LMX2531LQ2820E 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Performance Frequency Synthesizer System with Integrated VCO
LMX2531LQ2820E/NOPB 功能描述:鎖相環(huán) - PLL High Perf Freq Synth System RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray
LMX2531LQ3010E 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Performance Frequency Synthesizer System with Integrated VCO
LMX2531LQ3010E/NOPB 功能描述:鎖相環(huán) - PLL High Perf Freq Synth System RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray
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