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  • 一个100MHz的RMS DC转换集成电路

    AN22 details the theoretical and application aspects of the LT1088 thermal RMS/DC converter. The basic theory behind thermal RMS/DC conversion is discussed and design details of the LT1088 are presented. Circuitry for RMS/DC converters, wideband input buffers and heater protection is shown.

    标签: 100 MHz RMS 转换

    上传时间: 2013-10-16

    上传用户:china97wan

  • 低噪声,低压差稳压器的性能验证

      In an increasing trend, telecommunications, networking,audio and instrumentation require low noise power supplies.In particular, there is interest in low noise, lowdropout linear regulators (LDO). These components powernoise-sensitive circuitry, circuitry that contains noisesensitiveelements or both. Additionally, to conserve power,particularly in battery driven apparatus such as cellulartelephones, the regulators must operate with low input-tooutputvoltages.1 Devices presently becoming availablemeet these requirements (see separate section, “A Familyof 20mVRMS Noise, Low Dropout Regulators”).

    标签: 低噪声 低压差稳压器 性能

    上传时间: 2013-10-30

    上传用户:yeling1919

  • DCDC稳压器印刷电路板设计

      The LTM8020, LTM8021, LTM8022 and LTM8023 μModule®regulators are complete easy-to-use encapsulated stepdownDC/DC regulators intended to take the pain and aggravationout of implementing a switching power supplyonto a system board. With a μModule regulator, you onlyneed an input cap, output cap and one or two resistorsto complete the design. As one might imagine, this highlevel of integration greatly simplifi es the task of printedcircuit board design, reducing the effort to four categories:component footprint generation, component placement,routing the nets, and thermal vias.

    标签: DCDC 稳压器 印刷电路板

    上传时间: 2014-01-18

    上传用户:laomv123

  • 电网现场作业管理系统的信息化设计

    为了改变目前电网现场作业管理的变电巡检、变电检修试验、输电线路巡检检修等管理系统各自独立运行,信息不能共享,功能、效率受限,建设和维护成本高的现状,提出了采用B/S+C/S构架模式,将各现场作业管理模块和生产MIS(管理系统)集成为一体的现场作业管理系统的设计方案,做到各子系统和生产MIS软硬资源共享,做到同一数据唯一入口、一处录入多处使用。各子系统设备人员等基础信息来源于生产管理系统,各子系统又是生产管理系统的作业数据、缺陷信息的重要来源。经过研究试用成功和推广应用,目前该系统已在江西电网220 kV及以上变电站全面应用。 Abstract:  In order to improve the status that the substation field inspection system, substation equipments maintenance and testing system, power-line inspection and maintenance system are running independent with each other. They can?蒺t share the resource information which accordingly constrains their functions and efficiency, and their construction and maintenance costs are high. This paper introduces a field standardized work management system based on B/S+C/S mode, integrating all field work management systems based on MIS and share the equipments and employee?蒺s data of MIS,the field work data of the sub systems are the source information of MIS, by which the same single data resouce with one-time input can be utilized in multiple places. After the research and testing, this system is triumphantly using in all 220kV and above substations in Jiangxi grid.

    标签: 电网 信息化 管理系统

    上传时间: 2013-11-15

    上传用户:han_zh

  • SKS-100 Single Output Switchin

    Features:   High efficiency, high reliability, low cost  AC input range selected by switch  100% full load burn-in test  Protections: Short circuit / Over load  Fixed switching frequency at 25KHz  Cooling by free air convection  1 year warranty   Dimensions: 199*98*38mm (L*W*H)    

    标签: Switchin Output Single SKS

    上传时间: 2013-10-30

    上传用户:taa123456

  • xlisp最新驱动程序

    xlisp单片机驱动程序是是深圳市学林电子有限公司综合多年经验开发出的多功能8051单片机平台(兼容AVR/PIC单片机的部份烧写实验功能)。 集成常用的单片机外围硬件,ISP下载线,单片机仿真器, 单片机试验板,编程器功能于一身。配合本公司的近百个详细的汇编/c语言例子程序,可以让您在最短的时间内,全面的了解掌握单片机编程技术。特别适合于单片机初学者, 大中专院校, 单片机工程师, 实验室选用。 系统的特点: 1 全开放的模块化设计:所有硬件资源对用户开放,搭配随心所欲,不会出现硬件束缚软件的情况。既可学习软件, 更可深入的了解硬件。 2 高品质的工艺: 本机采用高档透明雅克力面板, 铝合金外箱, 全贴片机器生产, 工艺精美绝伦! 3 超强的电路资源配备:集成了基本上所有单片机应用中可能遇到的功能模块部份,你再也不必要去找其他零件,即可轻松完成您所需要的开发任务。 4 完美的例子程序: 集合本公司多年的经验,每个模块都有完整的带中文注释例子程序, 原理图, 接线方法, 很多都可以直接拿来应用。快速提高您的硬件,软件编程水平。 5 所有端口全部采用防插反设计,均配有连接照片和中文注解,即便您是初学者,也能轻松掌握。 6 配有ISP下载头。可选232/USB通信,CPU控制编程,不受电脑配置及操作系统影响,稳定性一流。 可以作为一台独立的ISP下载线使用,支持芯片包括51/AVR/PIC各系列!同时在板上可以直接对89S51/52等等芯片编程,当作独立编程器使用。 7  配有40P外接仿真头,可以作为一台独立的51单片机硬件仿真器使用,通过KEIL SOFT软件配合, 即可对外部硬件以及板上资源实现单步调试, 断点, 全速等等全部功能。   8 全中文软件操作导航, 独有智能一键通设计,擦除, 写入, 校验,运行自动完成,软件中英文自动选择, 适合港台地区用户使用。 特别设计的烧写实验仿真3IN1的公用卡座, CPU插上后即不需要插拔,烧写仿真等公用串口,使用极其方便简洁。  9 价格低廉,轻松拥有! 目前市面上同类产品价格均在2000-3000左右, 本套件是第一款600元以下的高档单片机实验仪!

    标签: xlisp 驱动程序

    上传时间: 2014-12-25

    上传用户:范缜东苑

  • 西门子S7-300 PLC模拟量转换

    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.

    标签: 300 PLC 西门子 模拟量

    上传时间: 2013-11-17

    上传用户:3294322651

  • AVR常用库函数介绍

    目录: 1. Character Type Functions - 字符类型函数 2. Standard C Input/Output Functions - 标准输入输出函数 3. Standard Library Functions - 标准库和内存分配函数 4. Mathematical Functions - 数学函数 5. String Functions - 字符串函数 6. BCD Conversion Functions - BCD 转换函数 7. Memory Access Functions - 存储器访问函数 8. Delay Functions - 延时函数 9. LCD Functions - LCD函数 10. LCD Functions for displays with 4x40 characters - 4×40 字符型LCD函数 11. LCD Functions for displays connected in 8 bit memory mapped mode -以8 位外部存储 器模式接口的LCD显示函数 12. I2C Bus Functions - I2C 总线函数 13. National Semiconductor LM75 Temperature Sensor Functions - LM75 温度传感器函数 14. Dallas Semiconductor DS1621 Thermometer/Thermostat Functions - DS1621 温度计函 数 15. Philips PCF8563 Real Time Clock Functions - PCF8563 实时时钟函数 16. Philips PCF8583 Real Time Clock Functions - PCF8583 实时时钟函数 17. Dallas Semiconductor DS1302 Real Time Clock Functions - DS1302 实时时钟函数 18. Dallas Semiconductor DS1307 Real Time Clock Functions - DS1307 实时时钟函数 19. 1 Wire Protocol Functions - 单线通讯协议函数 20. Dallas Semiconductor DS1820/DS1822 Temperature Sensors Functions - DS1820/1822 温度传感器函数 21. SPI Functions - SPI 函数 22. Power Management Functions - 电源管理函数 23. Gray Code Conversion Functions - 格雷码转换函数

    标签: AVR 库函数

    上传时间: 2013-10-22

    上传用户:归海惜雪

  • 基于AT89C52单片机的智能呼救系统设计

    从系统硬件设计和软件构成上,介绍一种以AT89C52单片机为核心,通过无线遥控方法实现对预设电话自动拨号报警的智能呼救系统。系统提供了患者在紧急情况下无法使用电话报警时的一种报警手段。由用户预设的多组电话号码作为语音报警对象,预录可长达20 s的语音信号来说明患者所处地点及病情,并通知患者家人。 Abstract:  This paper introduces a intelligent alarming system which is realized by wireless remote control system.This system chiefly consists of AT89C51 the system can processor.User can input several groups of telephone number regarded as alarming objects,The system can record some information 20 seconds to tell the site of the patient.And notice the rokonok of the patient.

    标签: 89C C52 AT 89

    上传时间: 2013-11-19

    上传用户:wd450412225

  • 基于ADuC841的膜片钳放大器系统设计

    为降低成本和解决现有膜片钳放大器系统中PC机的干扰问题,研究了一种基于单片机的膜片钳放大器小系统。该系统采用ADI公司生产的ADuC841作为控制核心,并且配置相应的液晶显示模块LCM3202401。模拟电路部分采用高输入阻抗的AD8627实现微电流信号的采集,并由后级电路进行信号的放大和电阻电容的补偿。它具有硬件电路简单、体积小、使用方便的特点。既可以单独作为小系统实现采集和显示,也可以通过红外方式和PC机进行通讯,在PC机上进行信号的处理。 Abstract:  In order to reduce cost and resolve the interferential problem with PC in existing patch clamp amplifiers, a small patch clamp amplifier system design based on microcontroller is studied. It adopts a new high performance microconverter ADuC841 by the ADI as the control core in the system, configuring a liquid crystal module LCM3202401. In the analog circuit, AD8627 with high input impedance is used to detect the low current,signal magnification, as well as resistance and capacitance compensation are accomplished by subsequent circuits. It has the advantage of simple hardware circuit design, small volume and convenient operation. It can either be used as an independent system to measure and show signal detected or transmit to PC by infrared ray.

    标签: ADuC 841 膜片钳 放大器

    上传时间: 2013-11-06

    上传用户:yy_cn