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Precision

新型精密運(yùn)算放大器應(yīng)用

Application considerations and circuits for the LT1001 and LT1002 single and dual Precision amplifiers are illustrated in a number of circuits, including strain gauge signal conditioners, linearized platinum RTD circuits, an ultra Precision dead zone circuit for motor servos and other examples.

標(biāo)簽： 精密運(yùn)算放大器

上傳時(shí)間： 2013-10-18

上傳用戶：dreamboy36
放大器及數(shù)據(jù)轉(zhuǎn)換器選擇指南

德州儀器(TI)通過多種不同的處理工藝提供了寬范圍的運(yùn)算放大器產(chǎn)品，其類型包括了高精度、微功耗、低電壓、高電壓、高速以及軌至軌。TI還開發(fā)了業(yè)界最大的低功耗及低電壓運(yùn)算放大器產(chǎn)品選集，其設(shè)計(jì)特性可滿足寬范圍的多種應(yīng)用。為使您的選擇流程更為輕松，我們提供了一個(gè)交互式的在線運(yùn)算放大器參數(shù)搜索引擎——amplifier.ti.com/search，可供您鏈接至各種不同規(guī)格的運(yùn)算放大器。設(shè)計(jì)考慮因素為某項(xiàng)應(yīng)用選擇最佳的運(yùn)算放大器所要考慮的因素涉及到多個(gè)相關(guān)聯(lián)的需求。為此，設(shè)計(jì)人員必須經(jīng)常權(quán)衡彼此矛盾的尺寸、成本、性能等指標(biāo)因素。即使是資歷最老的工程師也可能會(huì)為此而苦惱，但您大可不必如此。緊記以下的幾點(diǎn)，您將會(huì)發(fā)現(xiàn)選擇范圍將很快的縮小至可掌控的少數(shù)幾個(gè)。電源電壓(VS)——選擇表中包括了低電壓（最小值低于2.7V）及寬電壓范圍（最小值高于5V）的部分。其余運(yùn)放的選擇類型（例如精密），可通過快速查驗(yàn)供電范圍欄來適當(dāng)選擇。當(dāng)采用單電源供電時(shí)，應(yīng)用可能需要具有軌至軌(rail-to-rail)性能，并考慮精度相關(guān)的參數(shù)。精度——主要與輸入偏移電壓(VOS)相關(guān)，并分別考慮隨溫度漂移、電源抑制比(PSRR)以及共模抑制比(CMRR)的變化。精密(Precision)一般用于描述具有低輸入偏置電壓及低輸入偏置電壓溫度漂移的運(yùn)算放大器。微小信號(hào)需要高精度的運(yùn)算放大器，例如熱電偶及其它低電平的傳感器。高增益或多級(jí)電路則有可能需求低偏置電壓。

標(biāo)簽： 放大器數(shù)據(jù)轉(zhuǎn)換器選擇指南

上傳時(shí)間： 2013-11-25

上傳用戶：1966649934
零晶體管IC-IC設(shè)計(jì)一個(gè)新高度

Abstract: We can apply a BiCMOS integrated circuit with only resistors and no transistors to solve adifficult design problem. The mythically perfect operational amplifier's gain and temperature coefficient aredependent on external resistor values. Maxim Precision resistor arrays are manufactured together on asingle die and then automatically trimmed, to ensure close ratio matching. This guarantees that theoperational amplifier (op amp) gain and temperature coefficient are predictable and reliable, even withlarge production volumes.

標(biāo)簽： IC-IC 零晶體管

上傳時(shí)間： 2014-11-30

上傳用戶：ynzfm
凌力爾特電池管理解決方案

Linear Technology’s high performance battery management ICsenable long battery life and run time, while providing Precision charging control, constantstatus monitoring and stringent battery protection. Our proprietary design techniques seamlesslymanage multiple input sources while providing small solution footprints, faster charging and100% standalone operation. Battery and circuit protection features enable improved thermalperformance and high reliability operation.

標(biāo)簽： 凌力爾特電池管理方案

上傳時(shí)間： 2013-10-13

上傳用戶：yyq123456789
FP6291

DC/DC 升壓IC：The FP6291 is a current mode boost DC-DC converter. Its PWM circuitry with built-in 0.25 Ω power MOSFET make this regulator highly power efficient. The internal compensation network also minimizes as much as 6 external component counts. The non-inverting input of error amplifier connects to a 0.6V Precision reference voltage and internal soft-start function can reduce the inrush current. The FP6291 is available in the SOT23-6L package and provides space-saving PCB for the application fields.

標(biāo)簽： 6291 FP

上傳時(shí)間： 2013-11-07

上傳用戶：3294322651
GPON系統(tǒng)的APD偏置解決方案

Avalanche photo diode (APD) receiver modules arewidely used in fi ber optic communication systems. AnAPD module contains the APD and a signal conditioningamplifi er, but is not completely self contained. It stillrequires signifi cant support circuitry including a highvoltage, low noise power supply and a Precision currentmonitor to indicate the signal strength. The challenge issqueezing this support circuitry into applications withlimited board space. The LT®3482 addresses this challengeby integrating a monolithic DC/DC step-up converter andan accurate current monitor. The LT3482 can supportup to a 90V APD bias voltage, and the current monitorprovides better than 10% accuracy over four decades ofdynamic range (250nA to 2.5mA).

標(biāo)簽： GPON APD 方案

上傳時(shí)間： 2014-01-18

上傳用戶：wenyuoo
基于89C52的二極管特性測(cè)試器的設(shè)計(jì)

　　利用單片機(jī)具有的智能程序控制的特點(diǎn)，設(shè)計(jì)了基于STC89C52單片機(jī)的"二極管特性測(cè)試器"，可對(duì)二極管一般特性進(jìn)行快速測(cè)試。通過穩(wěn)定線性電流源給二極管加載恒定電流，然后由高精度模數(shù)轉(zhuǎn)換器測(cè)試其壓降，以此為基礎(chǔ)可判斷二極管好壞、檢測(cè)二極管極性和測(cè)試二極管伏安特性等，避免了用萬用表測(cè)試只能測(cè)得極性而不知其特性這一缺點(diǎn)。可用于電子設(shè)計(jì)制作過程中對(duì)二極管進(jìn)行快速測(cè)試，以確定被測(cè)二極管是否滿足電路的設(shè)計(jì)要求。　　Abstract: 　　By making good use of the intelligent control function of the Micro Controller Unit (MCU)， the diode trait tester was designed based on the STC89C52，which could be used to test the trait of a diode rapidly. By loading constant current to diode through the stable linear current source， and measuring the voltage drop of the diode by high-Precision analogue-to-digital converter (ADC)， it can judge whether the diode is good or not， distinguish the polarity of the diode， and test the trait that the diode， which can avoid the fault of using a multimeter can only measure the polarity but not the trait. This device can be used to test the trait of a diode quickly，and to make sure that whether a diode can be used in the electronic design or not.

標(biāo)簽： 89C52 二極管特性測(cè)試器

上傳時(shí)間： 2013-11-13

上傳用戶：assef
基于MSP430單片機(jī)的智能水位計(jì)設(shè)計(jì)

　　為解決我國水位監(jiān)測(cè)野外條件下長期無人看守的問題，研制開發(fā)了基于MSP430單片機(jī)的智能水位計(jì)。從其組成到各功能分別進(jìn)行了詳細(xì)的介紹，該智能水位計(jì)不僅實(shí)現(xiàn)了水位數(shù)據(jù)的實(shí)時(shí)監(jiān)測(cè)、記錄和定期采集等多種工作模式，而且提高了水位監(jiān)測(cè)精度，實(shí)現(xiàn)了水位監(jiān)測(cè)的智能化。　　Abstract: 　　In order to solve the problems of long-term unmanned observation in the field water monitoring，an intelligence water-level meter based on MSP430 is developed composition and every function moduce of the water level meter was introduced in detail. It not only realizes water level data collection and storage， regularly gathering and so on， but also improves the water-level Precision ， finally realizes the intelligence.

標(biāo)簽： MSP 430 單片機(jī) 水位計(jì)

上傳時(shí)間： 2013-11-17

上傳用戶：417313137
基于P89V51RD2的功率因數(shù)測(cè)量儀設(shè)計(jì)

設(shè)計(jì)一種基于P89V51RD2的功率因數(shù)測(cè)量儀，采用光電隔離器和專用數(shù)碼管驅(qū)動(dòng)器。該測(cè)量儀是以增強(qiáng)型單片機(jī)P89V51RD2為核心，大大簡化系統(tǒng)硬件設(shè)計(jì)。而軟件部分采用模塊化設(shè)計(jì)思想，采用中值濾波和小數(shù)補(bǔ)償算法，實(shí)現(xiàn)功率因數(shù)的高精度測(cè)量。實(shí)驗(yàn)測(cè)試表明，該功率因數(shù)測(cè)量儀測(cè)量精度高，運(yùn)行穩(wěn)定可靠。 Abstract: A power－factor measurement instrument based on P89V51RD2is designed，which uses optical coupler and specific LED drive chip.The power factor measurement instrument uses P89V51RD2as a core of which greatly simplifies the system design.Furthermore，modularization software is developed in detail.The high Precision power－factor measuring system is realized by the center value filter and fractional compensation algorithm.Experiments manifests that the power－ factor measurement instrument is high Precision，steady and reliable.

標(biāo)簽： P89 89V V51 RD2

上傳時(shí)間： 2014-12-27

上傳用戶：CHINA526
基于單片機(jī)89S52的多功能計(jì)數(shù)器設(shè)計(jì)

該系統(tǒng)由單片機(jī)89S52控制模塊，程控寬帶放大模塊，整形模塊，F(xiàn)PGA內(nèi)頻率、相位差測(cè)量模塊等構(gòu)成，采用等精度測(cè)頻法測(cè)出頻率和周期，可測(cè)量有效值為0.01～5V，頻率范圍1Hz～20MHz信號(hào)的頻率、周期信號(hào)，精度高達(dá)10-6。采用計(jì)數(shù)法測(cè)量相位差，該系統(tǒng)可測(cè)量有效值0.5～5V，頻率10Hz～100kHz信號(hào)的相位差，精度為1°。系統(tǒng)功能由按鍵控制，測(cè)量結(jié)果實(shí)時(shí)顯示，人機(jī)界面友好。 Abstract: The system consists of the following functional blocks:89S52microcontroller controlling module,programmable amplifier module,comparator module,frequency and phase difference testing module in the FPGA.The system use the equal accuracy frequency-examining technique it measures frequency and circle of signal which its ranges is from1Hz to20MHz and the amplitude of which its range is from0.01Vrms to5Vrms,Precision is up to10-6.Using of count method,the system detects the phase difference of signal,the amplitude of whic its range is from0.5Vrms to5Vrms and the frequency of which its ranges is from10Hz to100kHz,Precision is up to1°,The system functions is controlled by certain keys,measurement results are displayed in real-time and it is friendly interface.

標(biāo)簽： 89S52 單片機(jī) 多功能計(jì)數(shù)器

上傳時(shí)間： 2013-11-04

上傳用戶：CHINA526