The LTC®1966 is a true RMS-to-DC converter that uses aDS computational technique to make it dramatically simplerto use, significantly more accurate, lower in powerconsumption and more flexible than conventional logantilogRMS-to-DC converters. The LTC1966 RMS-to-DCconverter has an input signal range from 5mVRMS to1.5VRMS (a 50dB dynamic range with a single 5V supplyrail) and a 3dB bandwidth of 800kHz with signal crestfactors up to four.
標(biāo)簽： 真有效值 轉(zhuǎn)換器 自動(dòng)調(diào)節(jié)
上傳時(shí)間： 2013-10-12
上傳用戶：qilin
The STM32F10xxx microcontroller family embeds up to three advanced 12-bit ADCs (depending on the device) with a conversion time down to 1 μs. A self-calibration feature is provided to enhance ADC accuracy versus environmental condition changes.
上傳時(shí)間： 2014-12-23
上傳用戶：eastimage
開(kāi)關(guān)在電路中起接通信號(hào)或斷開(kāi)信號(hào)的作用。最常見(jiàn)的可控開(kāi)關(guān)是繼電器，當(dāng)給驅(qū)動(dòng)繼電器的驅(qū)動(dòng)電路加高電平或低電平時(shí)，繼電器就吸合或釋放，其觸點(diǎn)接通或斷開(kāi)電路。CMOS模擬開(kāi)關(guān)是一種可控開(kāi)關(guān)，它不象繼電器那樣可以用在大電流、高電壓場(chǎng)合，只適于處理幅度不超過(guò)其工作電壓、電流較小的模擬或數(shù)字信號(hào)。 一、常用CMOS模擬開(kāi)關(guān)引腳功能和工作原理 1.四雙向模擬開(kāi)關(guān)CD4066 CD4066 的引腳功能如圖1所示。每個(gè)封裝內(nèi)部有4個(gè)獨(dú)立的模擬開(kāi)關(guān)，每個(gè)模擬開(kāi)關(guān)有輸入、輸出、控制三個(gè)端子，其中輸入端和輸出端可互換。當(dāng)控制端加高電平時(shí)，開(kāi)關(guān)導(dǎo)通；當(dāng)控制端加低電平時(shí)開(kāi)關(guān)截止。模擬開(kāi)關(guān)導(dǎo)通時(shí)，導(dǎo)通電阻為幾十歐姆；模擬開(kāi)關(guān)截止時(shí)，呈現(xiàn)很高的阻抗，可以看成為開(kāi)路。模擬開(kāi)關(guān)可傳輸數(shù)字信號(hào)和模擬信號(hào)，可傳輸?shù)哪M信號(hào)的上限頻率為40MHz。各開(kāi)關(guān)間的串?dāng)_很小，典型值為－50dB。
標(biāo)簽： CMOS 模擬開(kāi)關(guān) 工作原理
上傳時(shí)間： 2013-10-27
上傳用戶：bibirnovis
減小電磁干擾的印刷電路板設(shè)計(jì)原則 內(nèi) 容 摘要……1 1 背景…1 1.1 射頻源.1 1.2 表面貼裝芯片和通孔元器件.1 1.3 靜態(tài)引腳活動(dòng)引腳和輸入.1 1.4 基本回路……..2 1.4.1 回路和偶極子的對(duì)稱性3 1.5 差模和共模…..3 2 電路板布局…4 2.1 電源和地…….4 2.1.1 感抗……4 2.1.2 兩層板和四層板4 2.1.3 單層板和二層板設(shè)計(jì)中的微處理器地.4 2.1.4 信號(hào)返回地……5 2.1.5 模擬數(shù)字和高壓…….5 2.1.6 模擬電源引腳和模擬參考電壓.5 2.1.7 四層板中電源平面因該怎么做和不應(yīng)該怎么做…….5 2.2 兩層板中的電源分配.6 2.2.1 單點(diǎn)和多點(diǎn)分配.6 2.2.2 星型分配6 2.2.3 格柵化地.7 2.2.4 旁路和鐵氧體磁珠……9 2.2.5 使噪聲靠近磁珠……..10 2.3 電路板分區(qū)…11 2.4 信號(hào)線……...12 2.4.1 容性和感性串?dāng)_……...12 2.4.2 天線因素和長(zhǎng)度規(guī)則...12 2.4.3 串聯(lián)終端傳輸線…..13 2.4.4 輸入阻抗匹配...13 2.5 電纜和接插件……...13 2.5.1 差模和共模噪聲……...14 2.5.2 串?dāng)_模型……..14 2.5.3 返回線路數(shù)目..14 2.5.4 對(duì)板外信號(hào)I/O的建議14 2.5.5 隔離噪聲和靜電放電ESD .14 2.6 其他布局問(wèn)題……...14 2.6.1 汽車(chē)和用戶應(yīng)用帶鍵盤(pán)和顯示器的前端面板印刷電路板...15 2.6.2 易感性布局…...15 3 屏蔽..16 3.1 工作原理…...16 3.2 屏蔽接地…...16 3.3 電纜和屏蔽旁路………………..16 4 總結(jié)…………………………………………17 5 參考文獻(xiàn)………………………17
標(biāo)簽： 印刷電路板 設(shè)計(jì)原則
上傳時(shí)間： 2013-10-24
上傳用戶：18165383642
目錄 第一章 傳輸線理論 一 傳輸線原理 二 微帶傳輸線 三 微帶傳輸線之不連續(xù)分析 第二章 被動(dòng)組件之電感設(shè)計(jì)與分析 一 電感原理 二 電感結(jié)構(gòu)與分析 三 電感設(shè)計(jì)與模擬 電感分析與量測(cè)
標(biāo)簽： 傳輸線
上傳時(shí)間： 2013-12-12
上傳用戶：浩子GG
特點(diǎn)(FEATURES) 精確度0.1%滿刻度 (Accuracy 0.1%F.S.) 可作各式數(shù)學(xué)演算式功能如:A+B/A-B/AxB/A/B/A&B(Hi or Lo)/|A| (Math functioA+B/A-B/AxB/A/B/A&B(Hi&Lo)/|A|/etc.....) 16 BIT 類(lèi)比輸出功能(16 bit DAC isolating analog output function) 輸入/輸出1/輸出2絕緣耐壓2仟伏特/1分鐘(Dielectric strength 2KVac/1min. (input/output1/output2/power)) 寬范圍交直流兩用電源設(shè)計(jì)(Wide input range for auxiliary power) 尺寸小,穩(wěn)定性高(Dimension small and High stability)
標(biāo)簽： 微電腦 數(shù)學(xué)演算 輸出 隔離傳送器
上傳時(shí)間： 2013-11-24
上傳用戶：541657925
Abstract: It is critically important that lithium-ion battery stacks have a good battery-management system for monitoring many cellvoltages and cell temperatures. Without that monitoring, thermal runaway can lead to a battery explosion. This design idea presentsa low-power circuit that measures the temperature of up to 12 thermistors. It powers and configures the multiplexers, and also putsthe muxes into shutdown to save power when not measuring temperatures.
標(biāo)簽： 電池管理系統(tǒng) 多點(diǎn) 溫度測(cè)量 方案
上傳時(shí)間： 2013-10-29
上傳用戶：xwd2010
The LTC®3414 offers a compact and efficient voltage regulatorsolution for point of load conversion in electronicsystems that require low output voltages (down to 0.8V)from a 2.5V to 5V power bus. Internal power MOSFETswitches, with only 67mW on-resistance, allow theLTC3414 to deliver up to 4A of output current with efficiencyas high as 94%. The LTC3414 saves space by operatingwith switching frequencies as high as 4MHz, enabling theuse of tiny inductors and capacitors.
標(biāo)簽： 同步穩(wěn)壓器 元件 驅(qū)動(dòng) 負(fù)載
上傳時(shí)間： 2014-01-03
上傳用戶：dongbaobao
To this day, Power over Ethernet (PoE) continues to gainpopularity in today’s networking world. The 12.95Wdelivered to the Powered Device (PD) input supplied bythe Power Sourcing Equipment (PSE) is a universal supply.Each PD provides its own DC/DC conversion from anominal 48V supply, thus eliminating the need for a correctvoltage wall adapter. However, higher power devicescan not take advantage of standard PoE because of itspower limitations, and must rely on a large wall adapteras their primary supply. The new LTC4268-1 breaks thispower barrier by allowing for power of up to 35W for suchpower-hungry 2-pair PoE applications. The LTC4268-1provides a complete solution by integrating a high powerPD interface control with an isolated fl yback controller.
上傳時(shí)間： 2014-12-24
上傳用戶：jasson5678
Typical industrial and automotive applications requiremultiple high current, low voltage power supply solutionsto drive everything from disc drives to microprocessors.For many of these applications, particularly thosethat have size constraints, the LT3501® dual step-downconverter is an attractive solution because it’s compactand inexpensive compared to a 2-chip solution. The dualconverter accommodates a 3V to 25V input voltage rangeand is capable of supplying up to 3A per channel. Thecircuit in Figure 1 produces 3.3V and 1.8V.
標(biāo)簽： 排序 雙通道 降壓轉(zhuǎn)換器
上傳時(shí)間： 2014-12-24
上傳用戶：372825274
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