<table id="64a8g"></table> 特點(diǎn)（FEATURES） 精確度0.03%滿刻度（Accuracy 0.03%F.S.） 頻率輸入范圍0.01Hz至80KHz（Input range from 0.01 Hz to 80KHz） 16 BIT 隔離類比輸出（16 bit DAC isolating analog output） 輸入與輸出1/輸出2絕緣耐壓 2仟伏特/1分鐘（Dielectric strength 2KVac/1min.（input/output1/output2）） 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 & High stability）
上傳時(shí)間： 2013-10-21
上傳用戶：dljwq
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
:設(shè)計(jì)了一種基于單片機(jī)控制的數(shù)控恒流源。數(shù)控恒流源以AT89S52 為控制核心,采用了高共模抑制比低溫漂的運(yùn)算放大器OP07 和達(dá)林頓管TIP122 構(gòu)成恒流源的主體,配以高精度12 bit D/ A 芯片MAX532 以及16 bit A/ D 芯片AD7715 完成單片機(jī)對(duì)輸出電流的實(shí)時(shí)監(jiān)測(cè)。
標(biāo)簽： 單片機(jī) 恒流源 技術(shù)研究
上傳時(shí)間： 2013-12-17
上傳用戶：asasasas
The LTC®4151 is a high side power monitor that includesa 12-bit ADC for measuring current and voltage, as wellas the voltage on an auxiliary input. Data is read throughthe widely used I2C interface. An unusual feature in thisdevice is its 7V to 80V operating range, allowing it to coverapplications from 12V automotive to 48V telecom.
標(biāo)簽： 452 DN 汽車應(yīng)用 電源監(jiān)視器
上傳時(shí)間： 2013-10-29
上傳用戶：集美慧
An essential component of a noise-free audio device isa clean power supply, but few switching regulators canoperate at high efficiency while keeping the switchingfrequency out of the audio band. The LTC®3620 fills thisvoid. It is a high efficiency 15mA buck regulator with aprogrammable minimum switching frequency, making itpossible to virtually eliminate audible switching noise. Theinternal synchronous switches and low quiescent currentof this buck regulator provide the ability to maintain highefficiency, while its small footprint makes it ideal for tiny,low power audio applications.
標(biāo)簽： 超低功率 控制 開關(guān)噪聲 方案
上傳時(shí)間： 2013-10-21
上傳用戶：非衣2016
鎖定放大是微弱信號(hào)檢測(cè)的重要手段。基于相關(guān)檢測(cè)理論，利用開關(guān)電容的開關(guān)實(shí)現(xiàn)鎖定放大器中乘法器的功能，提出開關(guān)電容和積分器相結(jié)合以實(shí)現(xiàn)相關(guān)檢測(cè)的方法，并設(shè)計(jì)出一種鎖定放大器。該鎖定放大器將微弱信號(hào)轉(zhuǎn)化為與之相關(guān)的方波，通過(guò)后續(xù)電路得到正比于被測(cè)信號(hào)的直流電平，為后續(xù)采集處理提供方便。測(cè)量數(shù)據(jù)表明鎖定放大器前級(jí)可將10-6 A的電流轉(zhuǎn)換為10-1 V的電壓，后級(jí)通過(guò)帶通濾波器級(jí)聯(lián)可將信號(hào)放大1×105倍。該方法在降低噪聲的同時(shí)，可對(duì)微弱信號(hào)進(jìn)行放大，線性度較高、穩(wěn)定性較好。 Abstract: Lock-in Amplifying（LIA）is one of important means for weak signal detection. Based on cross-correlation detection theory， switch in the swithched capacitor was used as multiplier of LIA， and a new method of correlation detection was proposed combining swithched capacitor with integrator. A kind of LIA was designed which can convert the weak signal to square-wave， then DC proportional to measured signal was obtained through follow-up conditioning circuit， providing convenience for signal acquisition and processing. The measured data shows that the electric current（10-6 A） can be changed into voltage（10-1 V） by LIA， and the signal is magnified 1×105 times by cascade band-pass filter. The noise is suppressed and the weak signal is amplified. It has the advantages of good linearity and stability.
標(biāo)簽： 開關(guān)電容 鎖定放大器
上傳時(shí)間： 2013-11-29
上傳用戶：黑漆漆
很不錯(cuò)的教材
標(biāo)簽： Microcontrollers Programmig PIC bit
上傳時(shí)間： 2013-11-01
上傳用戶：brain kung
新唐科技(原華邦電子邏輯事業(yè)群)，自2010年成功推出ARM® Cortex™-M0為內(nèi)核的32位單片機(jī) - NuMicro™ 家族后，持續(xù)專注于新一代微控制器系列產(chǎn)品的開發(fā)。同時(shí)，32位MCU的發(fā)展前景備受各方矚目，在工業(yè)控制、消費(fèi)電子、汽車電子、高速計(jì)算與通訊控制等應(yīng)用領(lǐng)域的推波助瀾下，32位MCU的成本和性價(jià)比展現(xiàn)令人期待的成長(zhǎng)爆發(fā)力。2012年新唐再度大展身手，開發(fā)出多款新系列32位元帶有 USB 全速2.0設(shè)備的低功耗NUC122系列，NUC123系列。為了使更多用戶快速了解新唐32-bit Cortex-M0 USB MCU的競(jìng)爭(zhēng)優(yōu)勢(shì)，本次我們特別選擇以NuMicro USB系列為研討會(huì)主題，歡迎您的參加與討論。
上傳時(shí)間： 2013-11-22
上傳用戶：1047385479
Analog Inputs and Outputs in an S7 PLC are represented in the PLC as a 16-bit integer. Over the nominal span of the analog input or output, the value of this integer will range between - 27648 and +27648. However, it is easier to use the analog values if they are scaled to the same units and ranges as the process being controlled. This applications tip describes methods for scaling analog values to and from engineering units.
上傳時(shí)間： 2013-11-17
上傳用戶：3294322651
在理論分析循環(huán)碼編碼和譯碼基本原理的基礎(chǔ)上，提出了基于單片機(jī)系統(tǒng)的(24，16)循環(huán)碼軟件實(shí)現(xiàn)編碼、譯碼的方案。仿真結(jié)果表明(24，16)循環(huán)碼能有效地克服來(lái)自通訊信道的干擾，保證數(shù)據(jù)通信的可靠及系統(tǒng)的穩(wěn)定，使誤碼率大幅度降低。本論文對(duì)(24，16)循環(huán)碼的研究結(jié)果表明，可以有效地降低錯(cuò)誤概率和提高系統(tǒng)的吞吐量，實(shí)現(xiàn)糾錯(cuò)僅需要在接收端增加有限的存儲(chǔ)空間和計(jì)算復(fù)雜度，具有一定的實(shí)用價(jià)值。 Abstract: Based on analyzing the theory of encoding and decoding of cyclic code， this paper showed the schemes of encoding and decoding of(24，16)cyclic code by the software and based on microcontroller. Simulation results show that using (24，16) cyclic codes can effectively overcome the interference from communication channel， ensure the reliability and stability of data communication systems， and reduce the bit error rate greatly. The results of this paper show that by using the (24，16) cyclic code， the error rate can be reduced and the system throughput can be improved. Meanwhile， the system only needs to enlarge limited storage space and computation the complexity at the receiving end to realize error correction. Thus the (24，16) cyclic code has a practical value.
標(biāo)簽： 24 16 單片機(jī)系統(tǒng) 循環(huán)碼
上傳時(shí)間： 2013-11-09
上傳用戶：gaoliangncepu
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