參數(shù)資料
型號(hào)： LMX2336
廠商： National Semiconductor Corporation
英文描述： PLLatinum⑩ Low Power Dual Frequency Synthesizer for RF Personal Communications
中文描述： PLLatinum⑩低功耗雙頻率合成射頻個(gè)人通信
文件頁(yè)數(shù)： 17/22頁(yè)
文件大?。?/td> 542K
代理商： LMX2336
Application Information
(Continued)
Fastlock Circuit Implementation
A diagram of the Fastlock scheme as implemented in Na-
tional Semiconductors LMX2335L/36L PLL is shown in Fig-
ure 5 When a new frequency is loaded, and the RF1 I
bit
is set high, the charge pump circuit receives an input to de-
liver 4 times the normal current per unit phase error while an
open drain NMOS on chip device switches in a second R2
resistor element to ground. The user calculates the loop filter
component values for the normal steady state consider-
ations. The device configuration ensures that as long as a
second identical damping resistor is wired in appropriately,
the loop will lock faster without any additional stability con-
siderations to account for. Once locked on the correct fre-
quency, the user can return the PLL to standard low noise
operation by sending a MICROWIRE instruction with the
RF1 I
bit set low. This transition does not affect the
charge on the loop filter capacitors and is enacted synchro-
nous with the charge pump output. This creates a nearly
seamless change between Fastlock and standard mode.
DS012807-16
FIGURE 4. Open Loop Response Bode Plot
DS012807-17
FIGURE 5. Fastlock PLL Architecture
www.national.com
17
相關(guān)PDF資料
PDF描述
LMX2336LSLB PLLatinum⑩ Low Power Dual Frequency Synthesizer for RF Personal Communications
LMX2336LTM PLLatinum⑩ Low Power Dual Frequency Synthesizer for RF Personal Communications
LMX2336TM PLLatinum⑩ Dual Frequency Synthesizer for RF Personal Communications
LMX2353TMX PLLatinum⑩ Fractional N Single 2.5 GHz Frequency Synthesizer
LMX2353TM PLLatinum⑩ Fractional N Single 2.5 GHz Frequency Synthesizer
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LMX2336 WAF 制造商:Texas Instruments 功能描述:
LMX2336L 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Low Power Dual Frequency Synthesizer for RF Personal Communications
LMX2336LSLB 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Low Power Dual Frequency Synthesizer for RF Personal Communications
LMX2336LSLBX 功能描述:IC PLLANTINUM SYNTHESZR LAM CSP 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:*
LMX2336LTM 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Low Power Dual Frequency Synthesizer for RF Personal Communications
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