參數(shù)資料
型號(hào)： LMX2347SLBX
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： XO, clock
英文描述： PLLatinum⑩ Frequency Synthesizer for RF Personal Communications
中文描述： PLL FREQUENCY SYNTHESIZER, 2500 MHz, CQCC16
封裝： CSP-16
文件頁數(shù)： 19/27頁
文件大?。?/td> 606K
代理商： LMX2347SLBX
OSC
IN
Sensitivity Test Setup
20038413
Notes:
1. Test Conditions: R_CNTR = 1000, LD_OUT = 2, PD = 0.
2. Sensitivity limit is reached when the frequency error of the divided RF input is greater than or equal to 1 Hz.
1.0 Functional Description
The basic phase-lock-loop (PLL) configuration consists of a
high-stability crystal reference oscillator, a frequency synthe-
sizer such as the National Semiconductor LMX2346/7, a
voltage controlled oscillator (VCO), and a passive loop filter.
The frequency synthesizer includes a phase detector, cur-
rent mode charge pump, a programmable reference divider,
and a programmable feedback divider. The VCO frequency
is established by dividing the crystal reference signal down
via the reference divider to obtain a frequency that sets the
comparison frequency. This reference signal, f
r
, is then pre-
sented to the input of a phase/frequency detector and com-
pared with another signal, f
p
, the feedback signal, which was
obtained by dividing the VCO frequency down by way of the
feedback divider. The phase/frequency detector measures
the phase error between the f
and f
signals and outputs
control signals that are directly proportional to the phase
error. The charge pump then pumps charge into or out of the
loop filter based on the magnitude and direction of the phase
error. The loop filter converts the charge into a stable control
voltage for the VCO. The phase/frequency detector’s func-
tion is to adjust the voltage presented to the VCO until the
feedback signal’s frequency and phase match that of the
reference signal. When this “phase-locked” condition exists,
the RF VCO’s frequency will be N times that of the compari-
son frequency, where N is the feedback divider ratio.
20038440
L
www.national.com
19
相關(guān)PDF資料
PDF描述
LMX2364SLEX 2.6 GHz PLLatinum Fractional RF Frequency Synthesizer with 850 MHz Integer IF Frequency Synthesizer
LMX2364 2.6 GHz PLLatinum Fractional RF Frequency Synthesizer with 850 MHz Integer IF Frequency Synthesizer
LMX2364TM 2.6 GHz PLLatinum Fractional RF Frequency Synthesizer with 850 MHz Integer IF Frequency Synthesizer
LMX2364TMX 2.6 GHz PLLatinum Fractional RF Frequency Synthesizer with 850 MHz Integer IF Frequency Synthesizer
LMX2370 PLLatinum Dual Frequency Synthesizer for RF Personal Communications(PLLatinum技術(shù)用于射頻個(gè)人通訊的雙通道頻率合成器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LMX2347SLBX/NOPB 功能描述:IC FREQ SYNTH 2.5GHZ 16LAMCSP 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:*
LMX2347TM 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Frequency Synthesizer for RF Personal Communications
LMX2347TM/NOPB 功能描述:IC FREQ SYNTH 2.5GHZ 16TSSOP 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:*
LMX2347TMX 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Frequency Synthesizer for RF Personal Communications
LMX2347TMX/NOPB 功能描述:IC FREQ SYNTH 2.5GHZ RF 16-TSSOP 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:*
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購

我的聯(lián)系方式

*
*
*