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DS1845/DS1855温度系数分析-DS1845/DS1

DS1845/DS1855温度系数分析-DS1845/DS1

Abstract: The temperature characteristics of digital potentiometers differ from those of traditional mechanical potentiometers. The effects of temperature on the absolute resistance of the potentiometer must be taken into consideration whe...

2009-04-28 标签:DS1DS1845 433

接口数控端口和电阻激光驱动器-Interfacing Dig

接口数控端口和电阻激光驱动器-Interfacing Dig

Abstract: This application brief describes the two topologies used to bias optical laser drivers (open loop and closed loop) and demonstrates examples using the DS1847 digital potentiometer and the MAX3273 laser driver. A laser module desi...

2009-04-28 标签:驱动器 261

如何解释DS1854,DS1857和DS1858温度和电压读

Abstract: The DS1854, DS1857, and DS1858 monitor VCC, ambient temperature, and external analog inputs. This application note explains how to interpret the values stored in the Main Device SRAM and translate them into temperature and voltag...

2009-04-28 标签:DS1DS1854 276

再生的DS1847/DS1848电阻校准常数-Regener

再生的DS1847/DS1848电阻校准常数-Regener

Abstract: The purpose of this application note is to show how the DS1847/48 digital resistor calibration constants can be regenerated. This application note assumes that the reader is familiar with the Programming the Lookup Table section ...

2009-04-28 标签:DS1DS1847 237

A Quick-Start Guide to DS1862

A Quick-Start Guide to DS1862

Abstract: This application note explains packet-error checking (PEC) as it applies to the DS1862 laser-control and digital-diagnostics IC. The DS1862 incorporates a CRC-8 byte and several other special bytes to improve the reliability of t...

2009-04-28 标签:DS1862 264

DS1863存储器速查指南

DS1863存储器速查指南

摘要:DS1863突发模式PON控制器集成了监测电路,可用于配置报警、预警、查找表及其它功能。为了实现这些编程功能,需要一个大容量的映射寄存器,本应用笔记介绍了寄存器图的...

2009-04-28 标签:DS1863 101

DS1865速查指南

DS1865速查指南

摘要:DS1865突发模式PON控制器内置监测电路,可用于配置报警、预警、查找表以及应用笔记4052 (DS1863存储器速查指南)中的其他详细功能。为实现这些编程功能,需要一个大容量的映...

2009-04-28 标签:DS1865 248

DS3984/DS3988变压器匝数比的选择

DS3984/DS3988变压器匝数比的选择

摘要:DS3984和DS3988是多通道的冷阴极荧光灯(CCFL)控制器。使用DS3984和DS3988优化系统设计时,关键参数是变压器匝数比的选择。本应用笔记介绍了变压器匝数比因不同的CCFL灯管和直流...

2009-04-28 标签:变压器 417

DS3906电阻计算器

DS3906电阻计算器

摘要:DS3906含有三个具有伪对数响应的可变电阻。当DS3906的内部电阻与外部电阻并联使用时,可获得小步长的线性响应。本应用笔记以及相关电子数据表用实例展示了通过并联外部...

2009-04-28 标签:DS3906电阻计 247

如何将DS1864的电流DAC转换成电压DAC

如何将DS1864的电流DAC转换成电压DAC

摘要:本文介绍了如何利用一个标准器件,将DS1864 SFP激光控制器/监测器中的电流DAC转换成电压输出。 电流DACDS1864包含两个8位吸电流DAC,可选择1.5mA或0.5mA满量...

2009-04-28 标签:DAC 783

lm339电压比较器

lm339电压比较器

lm339电压比较器  LM339集成块内部装有四个独立的电压比较器,该电压比较器的特点是:1)失调电压小,典型值为2mV;2)电源电压...

2009-04-27 标签:电压比较器lm339电压比较 2652

利用DS2726在充电器反接时保护Li+电池

利用DS2726在充电器反接时保护Li+电池

利用DS2726在充电器反接时保护Li+电池 摘要:本应用笔记通过简单的设计修改,可以利用DS2726 Li+电池保护器承受负压,在充电器反接时为电池提供保护。 ...

2009-04-27 标签:DS272在充电器 327

极点跟随的LDO稳压器频率补偿方法的研究

极点跟随的LDO稳压器频率补偿方法的研究

  LDO稳压器的频率补偿设计,不仅直接决定了频率稳定性,而且对LD0稳压器的性能参数,尤其是瞬态响应速度,有很大的影响。此外,随着当前半导体集成电路工艺的发展,越...

2009-04-27 标签:LDO频率补偿 470

能效手机充电器的电源设计与应用研究

能效手机充电器的电源设计与应用研究

  全球大型手机公司甚至开始要求充电器制造商供应空载功耗为30mW的充电器。根据能源之星EPS规范2.0版的要求,目前只有1/10的充电器达到这个标准。超低空载功耗开始成为不可...

2009-04-27 标签:充电器 900

采用DSP TMS320F28335的三相SPWM变频电源的

采用DSP TMS320F28335的三相SPWM变频电源的

  变频电源作为电源系统的重要组成部分,其性能的优劣直接关系到整个系统的安全和可靠性指标。现代变频电源以低功耗、高效率、电路简洁等显著优点而备受青睐。变频电...

2009-04-27 标签:变频电源 1678

Light Is On When Power Is Out

Light Is On When Power Is Out

Abstract: A loss of AC power during darkness (sensed by a photoresistor) turns on an array of battery-powered white LEDs. To conserve power, a timer turns off the LEDs after a particular period of time (for example, 10 minutes). ...

2009-04-27 标签:Power 397

动圈式仪表措施低级电流-Moving-Coil Meter

动圈式仪表措施低级电流-Moving-Coil Meter

Abstract: The MAX4172 IC substitutes a current amplifier for the shunt normally associated with a moving-coil meter. This circuit allows use of the moving-coil meter, even when the meter current is a large fraction of the current being mea...

2009-04-26 标签:电流 235

3V DAC在±10V中的应用

3V DAC在±10V中的应用

摘要:大多数现代系统中的电子器件通常采用3.3V或更低的电压供电,但有时还需提供±10V的电压驱动外部负载(工业应用中非常普遍)。尽管有些数/模转换器(DAC)能够以±10V的摆幅驱动...

2009-04-26 标签:DAC 350

50W音频放大器电源电路图,原理图

50W音频放大器电源电路图,原理图

50W音频放大器电源电路图,原理图 ...

2009-04-26 标签: 563

直流过压保护电路

直流过压保护电路

直流过压保护电路 笔者介绍附图所示的电源,不仅可用于仪表电路,也可用于视频或功率小于50W的音频放大器。 ...

2009-04-26 标签:过压保护 3310

改进的电源抑制集成电路线性稳压器-Improved Powe

改进的电源抑制集成电路线性稳压器-Improved Powe

Abstract: In portable communications low-dropout linear regulators (LDOs) are used to generate supply voltages for the RF circuitry; these voltages must be especially clean when powering the synthesizer and voltage-controlled oscillator (V...

2009-04-25 标签:稳压器 412

低噪声音频电源电路-Low Noise Audio Powe

低噪声音频电源电路-Low Noise Audio Powe

Abstract: Audio application note describes a simple, compact scheme that provides a low noise, low ripple power source for use in audio amplifiers, microphones, headphone amplifiers, CODECs and other audio circuits. ...

2009-04-25 标签:音频 242

参考电压的多通道ADC

参考电压的多通道ADC

Abstract: This paper discusses the successful implementation of two reference circuits tailored to the space-saving needs of ultrasound imaging applications, which commonly encounter the demand for one reference source to power multiple an...

2009-04-25 标签:ADC多通道 486

集成RF混频器与无源混频器方案的性能比较

集成RF混频器与无源混频器方案的性能比较

摘要:本应用笔记比较了集成RF混频器与无源混频器方案的整体性能,论述了两种方案的主要特征,并指出集成方案相对于无源方案的主要优点。 过去,RF研发人员在高...

2009-04-25 标签:混频器 206

副边变压器端接提升高速ADC的增益平坦度

副边变压器端接提升高速ADC的增益平坦度

摘要:本应用笔记描述了变压器原边端接和副边端接的区别,通常用于前置高速模/数转换器(ADC)的信号调理链路。本文详细说明了在较高中频(IF)的应用中,两种端接对高速ADC增益平...

2009-04-25 标签:变压器 94

4路(3路数据+1路时钟)LVDS串行器/解串器的延迟裕量测

4路(3路数据+1路时钟)LVDS串行器/解串器的延迟裕量测

摘要:对于MAX9209/MAX9222等多通道输入的LVDS串行/解串器,测量接收器的延迟裕量以判断它们的抖动容限是一种行之有效的方法。虽然一些文献给出了接收端的延迟定义,但还没有公认...

2009-04-25 标签:LVDS 422

Selecting and using RS-232 Int

Selecting and using RS-232 Int

Abstract: Devices and circuits are described for RS-232 interfaces operating from a wide range of power supplies. Systems are described for operation with the traditional triple supply of +5/12/-12V, +5/+12V, +5V only, +3V to +5.5V only, +...

2009-04-24 标签:Interface 696

Circuit Enables PCs to Communi

Circuit Enables PCs to Communi

Abstract: This application note describes a simple circuit allowing a PC to communicate via an IrDA-specified optical data port. The circuit employs only two integrated circuits (ICs), an external infrared LED, and an external avalanche ph...

2009-04-24 标签:Circuit 457

单端反激式开关电源电路

单端反激式开关电源电路

单端反激式开关电源电路图 它说C7是...

2009-04-24 标签:开关电源 1194

Parallel-Port Interface Powers

Parallel-Port Interface Powers

Abstract: A SOT step-down DC-DC converter efficiently "steals" power from a parallel port while a SIM/Smart Card level shift integrated circuit (IC) completes the interface. This allows the parallel port to power, and communicate with, low...

2009-04-24 标签:Parallel-P 309

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