The purpose of this application note is to show an example of how a digital potentiometer can be used in thefeedback loop of a step-up DC-DC converter to provide calibration and/OR adjustment of the output voltage.The example circuit uses a MAX5025 step-up DC-DC converter (capable of generating up to 36V,120mWmax) in conjunction with a DS1845, 256 position, NV digital potentiometer. FOR this example, the desiredoutput voltage is 32V, which is generated from an input supply of 5V. The output voltage can be adjusted in35mV increments (near 32V) and span a range wide enough to account fOR resistance, potentiometer and DCDCconverter tolerances (27.6V to 36.7V).
上传时间： 2014-12-23
上传用户：781354052
Abstract: Using a DAC and a microprocessOR supervisOR, the system safety can be improved in industrial controllers, programmablelogiccontrollers (PLC), and data-acquisition systems. The analog output is set to zero-scale (OR pin-programmable midscale) when amicroprocessOR failure, optocoupler failure, OR undervoltage condition occurs. A simple application is shown on how to implement thisfunction.
上传时间： 2013-10-17
上传用户：sjb555
This document and the associated reference design provide guidance fOR assigning anddebugging software to OR in FLASH memORy, specifically fOR a MicroBlaze™ embeddedprocessOR design.
上传时间： 2013-11-11
上传用户：dgann
Many applications require a clock signal to be synchronous, phase-locked, OR derived fromanother signal, such as a data signal OR another clock. This type of clock circuit is impORtant in
上传时间： 2014-12-23
上传用户：qq21508895
Photodiodes can be broken into two categORies: largearea photodiodes with their attendant high capacitance(30pF to 3000pF) and smaller area photodiodes withrelatively low capacitance (10pF OR less). FOR optimalsignal-to-noise perfORmance, a transimpedance amplifi erconsisting of an inverting op amp and a feedback resistORis most commonly used to convert the photodiode currentinto voltage. In low noise amplifi er design, large areaphotodiode amplifi ers require mORe attention to reducingop amp input voltage noise, while small area photodiodeamplifi ers require mORe attention to reducing op amp inputcurrent noise and parasitic capacitances.
上传时间： 2013-10-28
上传用户：hanbeidang
Many 8-bit and 16-bit microcontrollers feature 10-bitinternal ADCs. A few include 12-bit ADCs, but these oftenhave poOR OR nonexistent AC specifi cations, and certainlylack the perfORmance to meet the needs of an increasingnumber of applications. The LTC®2366 and its slowerspeed versions offer a high perfORmance alternative, asshown in the AC specifi cations in Table 1. Compare theseguaranteed specifi cations with the ADC built into yourcurrent microcontroller.
上传时间： 2013-10-26
上传用户：jackandlee
Control systems are becoming increasingly dependent on digital processing and so require sensORs able to provide direct digital inputs. SensORs based on time measurement, having outputs based on a frequency OR phase, have an advantage over conventional analogue sensORs in that their outputs can be measured directly in digital systems by pulse counting.
上传时间： 2013-10-08
上传用户：wuyuying
This application note is an overview discussion of theLinear Technology SPICE macromodel library. It assumeslittle if any priOR knowledge of this software library OR itshistORy. However, it does assume familiarity with both theanalog simulation program SPICE (OR one of its manyderivatives), and modern day op amps, including bipolar,JFET, and MOSFET amplifier technologies
上传时间： 2013-11-14
上传用户：zhanditian
This publication represents the largest LTC commitmentto an application note to date. No other application noteabsORbed as much effORt, took so long OR cost so much.This level of activity is justified by our belief that high speedmonolithic amplifiers greatly interest users.
标签： 高速放大器
上传时间： 2014-01-07
上传用户：wfl_yy
The ReactOR design pattern handles service requests that are delivered concurrently to an application by one OR mORe clients. Each service in an application may consist of serveral methods and is represented by a separate event handler that is responsible fOR dispatching service-specific requests.
上传时间： 2013-10-15
上传用户：libinxny
