常用D/A轉換器和A/D轉換器介紹 下面我們介紹一下其它常用D/A轉換器和 A/D 轉換器，便于同學們設計時使用。 1. DAC0808 圖 1 所示為權電流型 D/A 轉換器 DAC0808 的電路結構框圖。用 DAC0808 這類器件構 成的 D/A轉換器，需要外接運算放大器和產生基準電流用的電阻。DAC0808 構成的典型應用電路如圖2 所示。
標簽： 轉換器
上傳時間： 2014-12-23
上傳用戶：zhenyushaw
isoad系列產品實現傳感器和主機之間的信號安全隔離和高精度數字采集與傳輸，廣泛應用于rs-232/485總線工業自動化控制系統，4-20ma / 0-10v信號測量、監視和控制，小信號的測量以及工業現場信號隔離及長線傳輸等遠程監控場合。通過軟件的配置，可接入多種傳感器類型，包括電流輸出型、電壓輸出型、以及熱電偶等等。 產品內部包括電源隔離，信號隔離、線性化，a/d轉換和rs-485串行通信等模塊。每個串口最多可接256只iso ad系列模塊，通訊方式采用ascii 碼字符通訊協議或modbus rtu通訊協議，其指令集兼容于adam模塊，波特率可由用戶設置，能與其他廠家的控制模塊掛在同一rs-485總線上，便于主機編程。 isoad系列產品是基于單片機的智能監測和控制系統，所有用戶設定的校準值，地址，波特率，數據格式，校驗和狀態等配置信息都儲存在非易失性存儲器eeprom里。 isoad系列產品按工業標準設計、制造，信號輸入 / 輸出之間隔離，可承受3000vdc隔離電壓，抗干擾能力強，可靠性高。工作溫度范圍- 45℃～+80℃。
上傳時間： 2013-11-23
上傳用戶：comer1123
本次在線座談主要介紹TI的高精度Delta-Sigma A/D轉換器的原理及其應用，Delta-Sigma A/D轉換器在稱重儀器中，大量采用比例測量方法。
標簽： Delta-Sigma 高精度 轉換器
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.
上傳時間： 2013-11-12
上傳用戶：pans0ul
cv181l-a-20
標簽： Specification_V 181 1.0 L-A
上傳時間： 2013-11-14
上傳用戶：daijun20803
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題開關電源模塊并聯供電系統
上傳時間： 2013-11-10
上傳用戶：冇尾飛鉈
Avnet Design Service電源實驗室開發出基于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備 （3）LCD顯示電量 (kWh)、功率 (W)、電壓 (V)、電流 (A)、功率因數(PF) 與溫度 (oC) 測量值 （4）264Vac/63Hz與140mW @90Vac/47Hz條件下，無負載功耗低于300mW （5）測量精度高達2%
上傳時間： 2013-10-13
上傳用戶：cjf0304
車用真空熒光顯示器（VFD）需要特殊電源來生成所需電壓。雙葉電子工業株式會社（FUTABA）與愛普科斯已聯手為此開發了一款VFD的參考設計。 VFD的運行需要各種電壓，即燈絲、柵極以及陽極電壓。在使用電源線驅動的常規設備中，通常通過在功率變壓器上添加附加繞組以生成各種電壓。
上傳時間： 2013-11-21
上傳用戶：jyycc
