isoad系列产品实现传感器和主机之间的信号安全隔离和高精度数字采集与传输，广泛应用于rs-232/485总线工业自动化控制系统，4-20ma / 0-10v信号测量、监视和控制，小信号的测量以及工业现场信号隔离及长线传输等远程监控场合。通过软件的配置，可接入多种传感器类型，包括电流输出型、电压输出型、以及热电偶等等。 产品内部包括电源隔离，信号隔离、线性化，a/d转换和rs-485串行通信等模块。每个串口最多可接256只iso ad系列模块，通讯方式采用ascii 码字符通讯协议或modbus rtu通讯协议，其指令集兼容于adam模块，波特率可由用户设置，能与其他厂家的控制模块挂在同一rs-485总线上，便于主机编程。 isoad系列产品是基于单片机的智能监测和控制系统，所有用户设定的校准值，地址，波特率，数据格式，校验和状态等配置信息都储存在非易失性存储器eeprom里。 isoad系列产品按工业标准设计、制造，信号输入 / 输出之间隔离，可承受3000vdc隔离电压，抗干扰能力强，可靠性高。工作温度范围- 45℃～+80℃。
上传时间： 2013-11-23
上传用户：comer1123
主要介绍场效应管H参数的模型
上传时间： 2014-01-09
上传用户：1966649934
本次在线座谈主要介绍TI的高精度Delta-Sigma A/D转换器的原理及其应用，Delta-Sigma A/D转换器在称重仪器中，大量采用比例测量方法。
标签： Delta-Sigma 高精度 转换器
上传时间： 2013-10-17
上传用户：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.
标签： Converters Defini DAC
上传时间： 2013-10-30
上传用户：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.
上传时间： 2013-11-12
上传用户：pans0ul
第四章 信号分离电路 第四章 信号分离电路 第一节 滤波器的基本知识一、滤波器的功能和类型1、功能：滤波器是具有频率选择作用的电路或运算处理系统，具有滤除噪声和分离各种不同信号的功能。2、类型：按处理信号形式分：模拟滤波器和数字滤波器按功能分：低通、高通、带通、带阻按电路组成分：LC无源、RC无源、由特殊元件构成的无源滤波器、RC有源滤波器按传递函数的微分方程阶数分：一阶、二阶、高阶第一节 滤波器的基本知识 第一节 滤波器的基本知识二、模拟滤波器的传递函数与频率特性（一）模拟滤波器的传递函数模拟滤波电路的特性可由传递函数来描述。传递函数是输出与输入信号电压或电流拉氏变换之比。经分析，任意个互相隔离的线性网络级联后，总的传递函数等于各网络传递函数的乘积。这样，任何复杂的滤波网络，可由若干简单的一阶与二阶滤波电路级联构成。 第一节 滤波器的基本知识（二）模拟滤波器的频率特性模拟滤波器的传递函数H(s)表达了滤波器的输入与输出间的传递关系。若滤波器的输入信号Ui是角频率为w的单位信号，滤波器的输出Uo(jw)=H(jw)表达了在单位信号输入情况下的输出信号随频率变化的关系，称为滤波器的频率特性函数，简称频率特性。频率特性H(jw)是一个复函数，其幅值A(w)称为幅频特性，其幅角∮(w)表示输出信号的相位相对于输入信号相位的变化，称为相频特性。
上传时间： 2014-12-23
上传用户：wutong
高速数字系统设计下载pdf:High-Speed Digital SystemDesign—A Handbook ofInterconnect Theory and DesignPracticesStephen H. HallGarrett W. HallJames A. McCallA Wiley-Interscience Publication JOHN WILEY & SONS, INC.New York • Chichester • Weinheim • Brisbane • Singapore • TorontoCopyright © 2000 by John Wiley & Sons, Inc.speeddigital systems at the platform level. The book walks the reader through everyrequired concept, from basic transmission line theory to digital timing analysis, high-speedmeasurement techniques, as well as many other topics. In doing so, a unique balancebetween theory and practical applications is achieved that will allow the reader not only tounderstand the nature of the problem, but also provide practical guidance to the solution.The level of theoretical understanding is such that the reader will be equipped to see beyondthe immediate practical application and solve problems not contained within these pages.Much of the information in this book has not been needed in past digital designs but isabsolutely necessary today. Most of the information covered here is not covered in standardcollege curricula, at least not in its focus on digital design, which is arguably one of the mostsignificant industries in electrical engineering.The focus of this book is on the design of robust high-volume, high-speed digital productssuch as computer systems, with particular attention paid to computer busses. However, thetheory presented is applicable to any high-speed digital system. All of the techniquescovered in this book have been applied in industry to actual digital products that have beensuccessfully produced and sold in high volume.Practicing engineers and graduate and undergraduate students who have completed basicelectromagnetic or microwave design classes are equipped to fully comprehend the theorypresented in this book. At a practical level, however, basic circuit theory is all thebackground required to apply the formulas in this book.
上传时间： 2013-10-26
上传用户：缥缈
三极管代换手册下载 前言 使用说明 三极管对照表 A B C D E F G H K L M …… 外形与管脚排列图
上传时间： 2013-10-24
上传用户：zjf3110
cv181l-a-20
标签： Specification_V 181 1.0 L-A
上传时间： 2013-11-14
上传用户：daijun20803
Abstract: This document details the Lakewood (MAXREFDES7#) subsystem reference design, a 3.3V input, ±12V (±15V) output, isolated power supply. The Lakewood reference design includes a 3W primary-side transformer H-bridge driver for isolated supplies, and two wide input range and adjustable output low-dropout linear regulators (LDOs). Test results and hardware files are included.
标签： MAXREFDES Lakewood Isolated Output
上传时间： 2013-11-02
上传用户：fengzimili
