This application note describes a Linear Technology "Half-Flash" A/D converter, the LTC1099, being connected to a 256 element line scan photodiode array. This technology adapts itself to handheld (i.e., low POWER) bar code readers, as well as high resolution automated machine inspection applications..
標(biāo)簽： 1099 LTC 8位 AD轉(zhuǎn)換
上傳時(shí)間： 2013-11-21
上傳用戶：lchjng
Low POWER operation of electronic apparatus has becomeincreasingly desirable. Medical, remote data acquisition,POWER monitoring and other applications are good candidatesfor battery driven, low POWER operation. MicroPOWERanalog circuits for transducer-based signal conditioningpresent a special class of problems. Although microPOWERICs are available, the interconnection of these devices toform a functioning microPOWER circuit requires care. (SeeBox Sections, “Some Guidelines for MicroPOWER Designand an Example” and “Parasitic Effects of Test Equipmenton MicroPOWER Circuits.”) In particular, trade-offs betweensignal levels and POWER dissipation become painful whenperformance in the 10-bit to 12-bit area is desirable.
標(biāo)簽： 信號(hào)調(diào)理 微電路
上傳時(shí)間： 2013-10-22
上傳用戶：rocketrevenge
Portable, battery-POWERed operation of electronic apparatushas become increasingly desirable. Medical, remotedata acquisition, POWER monitoring and other applicationsare good candidates for battery operation. In some circumstances,due to space, POWER or reliability considerations,it is preferable to operate the circuitry from a single 1.5Vcell. Unfortunately, a 1.5V supply eliminates almost alllinear ICs as design candidates. In fact, the LM10 opamp-reference and the LT®1017/LT1018 comparators arethe only IC gain blocks fully specifi ed for 1.5V operation.Further complications are presented by the 600mV dropof silicon transistors and diodes. This limitation consumesa substantial portion of available supply range, makingcircuit design diffi cult. Additionally, any circuit designedfor 1.5V operation must function at end-of-life batteryvoltage, typically 1.3V. (See Box Section, “Componentsfor 1.5V Operation.”)
標(biāo)簽： Circuitry Operation Single 1017
上傳時(shí)間： 2013-12-20
上傳用戶：Wwill
設(shè)計(jì)了水聲信號(hào)發(fā)生系統(tǒng)中的功率放大電路，可將前級(jí)電路產(chǎn)生的方波信號(hào)轉(zhuǎn)換為正弦信號(hào)，同時(shí)進(jìn)行濾波、功率放大，使其滿足換能器對輸入信號(hào)的要求。該電路以單片機(jī)AT89C52，集成6階巴特沃思低通濾波芯片MF6以及大功率運(yùn)算放大器LM12為核心，通過標(biāo)準(zhǔn)RS232接口與PC進(jìn)行通信，實(shí)現(xiàn)信號(hào)增益的程控調(diào)節(jié)，對干擾信號(hào)具有良好的抑制作用。經(jīng)調(diào)試該電路工作穩(wěn)定正常，輸出波形無失真，在輸出功率以及放大增益、波紋系數(shù)等方面均滿足設(shè)計(jì)要求。 This paper presented a design and implementation of underwater acoustic POWER amplifer. This circuit converted the rectangle signal generated by frontend circuit into the sine signal， then filtered and POWER amplification， it meets the requirements of the transducer.Included AT89C52， 6th order Butterworth filter MF6， hiPOWER amplififier LM12.Communication with PC through the RS232 port. The signal gain is adjustable and could be remote controlled. It has a good inhibitory effect on the interference signal. After debugged， this circuit works stable， the output waveform has no distortion， it meets the design requirement in outprt POWER， amplifier gain and ripple factor.
上傳時(shí)間： 2013-11-20
上傳用戶：qwe1234
The LM20, LM45, LM50, LM60, LM61, and LM62 are analog output temperature sensors. They have various output voltage slopes (6.25mV/°C to 17mV/°C) and POWER supply voltage ranges (2.4V to 10V).The LM20 is the smallest, lowest POWER consumption analog output temperature sensor National Semiconductor has released. The LM70 and LM74 are MICROWIRE/SPI compatible digital temperature sensors. The LM70 has a resolution of 0.125°C while the LM74 has a resolution of 0.625°C. The LM74 is the most accurate of the two with an accuracy better than ±1.25°C. The LM75 is National’s first digital output temperature sensor, released several years ago.
標(biāo)簽： temperatu tiny 遠(yuǎn)程系統(tǒng) 溫度傳感器
上傳時(shí)間： 2014-12-23
上傳用戶：yl8908
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.
標(biāo)簽： Converter Defi ADC 轉(zhuǎn)換器
上傳時(shí)間： 2013-11-12
上傳用戶：pans0ul
摘要：從功率MOSFET內(nèi)部結(jié)構(gòu)和極間電容的電壓依賴關(guān)系出發(fā)，對功率MOSFET的開關(guān)現(xiàn)象及其原因進(jìn)行了較深入分析。從實(shí)際應(yīng)用的角度，對功率MOSFET開關(guān)過程的功率損耗和所需驅(qū)動(dòng)功率進(jìn)行了研究，提出了有關(guān)參數(shù)的計(jì)算方法，并對多種因素對開關(guān)特性的影響效果進(jìn)行了實(shí)驗(yàn)研究，所得出的結(jié)論對于功率MOSFET的正確運(yùn)用和設(shè)計(jì)合理的MoSFET驅(qū)動(dòng)電路具有指導(dǎo)意義．
標(biāo)簽： MOSFET POWER 實(shí)際應(yīng)用 條件下
上傳時(shí)間： 2013-11-10
上傳用戶：wfeel
POWER conversion by virtue of its basic role produces harmonics due to theslicing of either voltages or currents. To a large extent the pollution in theutility supply and the deterioration of the POWER quality has been generatedor created by non-linear converters. It is therefore ironic that POWER convertersshould now be used to clean up the pollution that they helped to create inthe first place.In a utility system, it is desirable to prevent harmonic currents (which resultin EMI and resonance problems) and limit reactive POWER flows (whichresult in transmission losses).Traditionally, shunt passive filters, comprised of tuned LC elements andcapacitor banks, were used to filter the harmonics and to compensate forreactive current due to non-linear loads. However, in practical applicationsthese methods have many disadvantages.
上傳時(shí)間： 2013-11-05
上傳用戶：AISINI005
This reference design (RD) features a fullyassembled and tested surface-mount printed circuitboard (PCB). The RD board utilizes the MAX48851:2 or 2:1 multiplexer and other ICs to implement acomplete video graphics array (VGA) 8:1multiplexer.VGA input/output connections are provided to easilyinterface the MAX4885 RD board with VGAcompatibledevices. The RD board gives the optionto use a single 5V DC POWER supply (V+), or this RDboard can be POWERed from any one of the eight VGA sources.
標(biāo)簽： multiplexer reference VGA
上傳時(shí)間： 2013-11-09
上傳用戶：ANRAN
OPTOELECTRONICS CIRCUIT COLLECTION AVALANCHE PHOTODIODE BIAS SUPPLY 1Provides an output voltage of 0V to +80V for reverse biasingan avalanche photodiode to control its gain. This circuit canalso be reconfigured to supply a 0V to –80V output.LINEAR TEC DRIVER–1This is a bridge-tied load (BTL) linear amplifier for drivinga thermoelectric cooler (TEC). It operates on a single +5Vsupply and can drive ±2A into a common TEC.LINEAR TEC DRIVER–2This is very similar to DRIVER–1 but its POWER output stagewas modified to operate from a single +3.3V supply in orderto increase its efficiency. Driving this amplifier from astandard +2.5V referenced signal causes the output transistorsto have unequal POWER dissipation.LINEAR TEC DRIVER–3This BTL TEC driver POWER output stage achieves very highefficiency by swinging very close to its supply rails, ±2.5V.This driver can also drive ±2A into a common TEC. Operationis shown with the POWER output stage operating on±1.5V supplies. Under these conditions, this linear amplifiercan achieve very high efficiency. Application ReportThe following collection of analog circuits may be useful in electro-optics applications such as optical networkingsystems. This page summarizes their salient characteristics.
標(biāo)簽： 光電轉(zhuǎn)換 電路設(shè)計(jì)
上傳時(shí)間： 2013-10-27
上傳用戶：落花無痕
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