本次在線座談主要介紹TI的高精度Delta-Sigma A/D轉(zhuǎn)換器的原理及其應(yīng)用，Delta-Sigma A/D轉(zhuǎn)換器在稱重儀器中，大量采用比例測量方法。
標(biāo)簽： Delta-Sigma 高精度 轉(zhuǎn)換器
上傳時間： 2013-10-17
上傳用戶：zhqzal1014
Differential Nonlinearity: Ideally, any two adjacent digitalcodes correspond to output analog voltages that are exactlyone LSB apart. Differential non-linearity is a measure of theworst case deviation from the ideal 1 LSB step. For example,a DAC with a 1.5 LSB output change for a 1 LSB digital codechange exhibits 1⁄2 LSB differential non-linearity. Differentialnon-linearity may be expressed in fractional bits or as a percentageof full scale. A differential non-linearity greater than1 LSB will lead to a non-monotonic transfer function in aDAC.Gain Error (Full Scale Error): The difference between theoutput voltage (or current) with full scale input code and theideal voltage (or current) that should exist with a full scale inputcode.Gain Temperature Coefficient (Full Scale TemperatureCoefficient): Change in gain error divided by change in temperature.Usually expressed in parts per million per degreeCelsius (ppm/°C).Integral Nonlinearity (Linearity Error): Worst case deviationfrom the line between the endpoints (zero and full scale).Can be expressed as a percentage of full scale or in fractionof an LSB.LSB (Lease-Significant Bit): In a binary coded system thisis the bit that carries the smallest value or weight. Its value isthe full scale voltage (or current) divided by 2n, where n is theresolution of the converter.Monotonicity: A monotonic function has a slope whose signdoes not change. A monotonic DAC has an output thatchanges in the same direction (or remains constant) for eachincrease in the input code. the converse is true for decreasing codes.
標(biāo)簽： Converters Defini DAC
上傳時間： 2013-10-30
上傳用戶：stvnash
ANALOG INPUT BANDWIDTH is a measure of the frequencyat which the reconstructed output fundamental drops3 dB below its low frequency value for a full scale input. Thetest is performed with fIN equal to 100 kHz plus integer multiplesof fCLK. The input frequency at which the output is −3dB relative to the low frequency input signal is the full powerbandwidth.APERTURE JITTER is the variation in aperture delay fromsample to sample. Aperture jitter shows up as input noise.APERTURE DELAY See Sampling Delay.BOTTOM OFFSET is the difference between the input voltagethat just causes the output code to transition to the firstcode and the negative reference voltage. Bottom Offset isdefined as EOB = VZT–VRB, where VZT is the first code transitioninput voltage and VRB is the lower reference voltage.Note that this is different from the normal Zero Scale Error.CONVERSION LATENCY See PIPELINE DELAY.CONVERSION TIME is the time required for a completemeasurement by an analog-to-digital converter. Since theConversion Time does not include acquisition time, multiplexerset up time, or other elements of a complete conversioncycle, the conversion time may be less than theThroughput Time.DC COMMON-MODE ERROR is a specification which appliesto ADCs with differential inputs. It is the change in theoutput code that occurs when the analog voltages on the twoinputs are changed by an equal amount. It is usually expressed in LSBs.
標(biāo)簽： Converter Defi ADC 轉(zhuǎn)換器
上傳時間： 2013-11-12
上傳用戶：pans0ul
cv181l-a-20
標(biāo)簽： Specification_V 181 1.0 L-A
上傳時間： 2013-11-14
上傳用戶：daijun20803
為了實(shí)現(xiàn)直流電源的監(jiān)控，提出了一種具有USB HID數(shù)據(jù)通信功能的直流電源設(shè)計方案。詳細(xì)論述了基于STM32 USB固件庫（USB-FS Device library V3.3）的自定義HID類下位機(jī)的實(shí)現(xiàn)，介紹了如何在VC2010集成開發(fā)環(huán)境中編寫多線程上位機(jī)程序并運(yùn)用PlotLab（一個快速信號繪圖和可視化的VCL組件）顯示實(shí)時波形，最后再以實(shí)驗(yàn)開發(fā)板和PC實(shí)現(xiàn)了HID數(shù)據(jù)通信，證明了此監(jiān)控設(shè)計方案的可行性。
標(biāo)簽： USB HID 數(shù)據(jù)通信 直流電源
上傳時間： 2013-10-17
上傳用戶：13162218709
USB充電自動識別芯片，支持Apple手機(jī)，電流可達(dá)2A。
上傳時間： 2013-11-25
上傳用戶：dancnc
德州儀器微小型電源電路顯著簡化USB電池充電器設(shè)計
標(biāo)簽： USB 德州儀器 充電器設(shè)計 電源電路
上傳時間： 2014-12-24
上傳用戶：浩子GG
2012TI杯陜西賽題H題,2012TI杯陜西賽題-A微弱信號檢測裝置.
上傳時間： 2013-12-17
上傳用戶：362279997
2011全國大賽A題開關(guān)電源模塊并聯(lián)供電系統(tǒng)
標(biāo)簽： 2011 大賽 開關(guān)電源模塊 并聯(lián)供電系統(tǒng)
上傳時間： 2013-11-10
上傳用戶：冇尾飛鉈
Avnet Design Service電源實(shí)驗(yàn)室開發(fā)出基于MSP430FE427(A) 模塊的電度表解決方案： （1）電壓 (90Vac~264Vac) 與電流 (10Arms) 測量范圍寬 （2）電度表是一種測量用電量的設(shè)備 （3）LCD顯示電量 (kWh)、功率 (W)、電壓 (V)、電流 (A)、功率因數(shù)(PF) 與溫度 (oC) 測量值 （4）264Vac/63Hz與140mW @90Vac/47Hz條件下，無負(fù)載功耗低于300mW （5）測量精度高達(dá)2%
上傳時間： 2013-10-13
上傳用戶：cjf0304
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