The LTC®3562 quad output step-down regulator is designedfor multicore handheld microprocessor applications thatoperate from a single Li-Ion battery. Its four monolithic, higheffi ciency buck regulators support Intel’s mobile CPU P-Stateand C-State energy saving operating modes. The outputvoltages are independently controllable via I2C, and eachoutput can be independently started and shut down. Designerscan choose from power saving pulse-skipping mode orBurst Mode® operation, or select low noise LDO mode. Thespace-saving LTC3562 is available in a 3mm × 3mm QFNpackage and requires few external components.
上傳時(shí)間： 2013-10-07
上傳用戶：1583060504
Many system designers need an easy way to producea negative 3.3V power supply. In systems that alreadyhave a transformer, one option is to swap out the existingtransformer with one that has an additional secondarywinding. The problem with this solution is that manysystems now use transformers that are standard, offthe-shelf components, and most designers want toavoid replacing a standard, qualifi ed transformer with acustom version. An easier alternative is to produce thelow negative voltage rail by stepping down an existingnegative rail. For example, if the system already employsan off-the-shelf transformer with two secondary windingsto produce ±12V, and a –3.3V rail is needed, a negativebuck converter can produce the –3.3V output from the–12V rail.
標(biāo)簽： 458 DN 降壓轉(zhuǎn)換器 低電壓
上傳時(shí)間： 2013-10-09
上傳用戶：Jerry_Chow
Linear Technology’s DC/DC step-down μModule®regulators are complete switchmode power supplies in asurface-mount package. They include the DC/DC controller,inductor, power switches and supporting circuitry.These highly integrated regulators also provide an easysolution for applications that require negative outputvoltages. In other words, these products can operate asinverting buck-boost regulators. As a result, the lowestpotential in the circuit is not the standard 0V, but –VOUT,which must be tied to the μModule regulator’s GND. Allsignals are now referred to –VOUT.
標(biāo)簽： Module 如何制作 降壓穩(wěn)壓器 輸入輸出
上傳時(shí)間： 2013-10-22
上傳用戶：ztj182002
Abstract: This article discusses future trends in the design of smartphones and other consumer products. The discussion focuses onthe importance of integration, which saves valuable PCB space and drives down costs.
標(biāo)簽： 集成 智能手機(jī) 驅(qū)動(dòng)器
上傳時(shí)間： 2014-01-13
上傳用戶：lhw888
XRP7714是一款四輸出脈寬調(diào)制（PWM）分級(jí)降壓（step down）DC-DC控制器，并具有內(nèi)置LDO提供待機(jī)電源。該器件在單個(gè)IC上為電池供電的產(chǎn)品提供了整套的電源管理方案，并且通過(guò)內(nèi)含的I2C串行接口進(jìn)行整體的編程配置。XRP7714器件的每一路輸出電壓的編程范圍是0.9V～5.1V，此范圍內(nèi)無(wú)需外部分壓器。可編程DPWM開(kāi)關(guān)頻率的范圍從300kHz到1.5MHz，使用戶能夠在效率和元件大小之間取得最優(yōu)方案。為了讓用戶能夠在設(shè)計(jì)的多路電源XRP7714系統(tǒng)能夠取得最優(yōu)的方案，下文將詳細(xì)的介紹影響XRP7714系統(tǒng)效率的參數(shù)設(shè)置以及外圍器件的選型。
標(biāo)簽： 7714 XRP 多路電源 參數(shù)
上傳時(shí)間： 2013-10-31
上傳用戶：chendawei
產(chǎn)品特性2.4Ghz全球開(kāi)放ISM頻段,免許可證使用最高工作速率1Mbps,高效GMSK調(diào)制,抗干擾能力強(qiáng),特別適合工業(yè)控制場(chǎng)合125頻道,滿足多點(diǎn)通信和跳頻通信需要內(nèi)置硬件CRC檢錯(cuò)和點(diǎn)對(duì)多點(diǎn)通信地址控制低功耗1.9~3.6V工作Power Down模式下?tīng)顟B(tài)僅為1uA內(nèi)置2.4Ghz天線,體積小巧約24x24mm不包括天線模塊可軟件設(shè)地址,只有收到本機(jī)地址時(shí)才會(huì)輸出數(shù)據(jù)(提供中斷指示,可直接接各種單片機(jī)使用,軟件編程非常方便內(nèi)置專門穩(wěn)壓電路,使用各種電源包括DC/DC開(kāi)關(guān)電源均有很好的通信效果標(biāo)準(zhǔn)DIP間距接口便于嵌入式應(yīng)用PTR4000-Quick-DEV快速開(kāi)發(fā)系統(tǒng),含開(kāi)發(fā)板、源代碼、原理圖等詳細(xì)資料，即開(kāi)即用，上手快，縮短您的開(kāi)發(fā)時(shí)間
上傳時(shí)間： 2013-10-12
上傳用戶：sz_hjbf
闡述了一個(gè)由上位PC機(jī)和AT89C52下位單片機(jī)組成的主從分布式溫度巡回檢測(cè)系統(tǒng)。主從機(jī)采用RS-485 串行通訊標(biāo)準(zhǔn)進(jìn)行通信，可在下位單片機(jī)實(shí)現(xiàn)基本的溫度數(shù)據(jù)巡回檢測(cè)基礎(chǔ)上，由上位PC機(jī)實(shí)現(xiàn)綜合處理功能或擴(kuò)展為遠(yuǎn)程操作。整個(gè)系統(tǒng)具有巡檢速度快，擴(kuò)展性好的特點(diǎn)。 Abstract: In this paper,a top PC and AT89C52 under-bit microcontrollers from the main component of the tour distributed temperature detection system is presented. Master and slave can use RS-485 serial communication standards for communications.Based on next-bit machine for basic goods temperature detected data Tour, the top can achieve the integrated treatment of PC functions or for the expansion of long-distance operation. The entire inspection system is fast, expansion.
上傳時(shí)間： 2013-10-13
上傳用戶：zhoujunzhen
MMC/SD卡以其優(yōu)越的性能，在單片機(jī)嵌入式設(shè)備中得到廣泛應(yīng)用。將MMC/SD卡作為外部掉電存儲(chǔ)介質(zhì)應(yīng)用于音頻信號(hào)發(fā)生器中，通過(guò)8051F330單片機(jī)上的SPI接口，實(shí)現(xiàn)單片機(jī)—MMC/SD卡的存儲(chǔ)擴(kuò)展，設(shè)計(jì)了此硬件平臺(tái)上的MMC/SD卡的單片機(jī)驅(qū)動(dòng)程序，并給出了相應(yīng)的程序代碼，滿足音頻信號(hào)發(fā)生器的大容量存儲(chǔ)要求。 Abstract: MMC/SD card is more and more widely used in the single chip embedded devices for their excellent performances.This article introduces the application of MMC/SD card as the external power down storage medium in audio signal generator. The extension technology especially for storage of single chip-MMC/SD card via SPI interfaces in 8051F330 single chip, including designs single chip drive program of MMC/SD card based on hardware platform,and also gives the key coding of the program. The implementation of big capacity storage is meaningful in audio signal generator.
標(biāo)簽： 8051F330 音頻信號(hào) 發(fā)生器
上傳時(shí)間： 2014-12-27
上傳用戶：黃華強(qiáng)
FEATURES400 MSPS internal clock speedIntegrated 10-bit DAC32-bit tuning wordPhase noise ≤ –120 dBc/Hz @ 1 kHz offset (DAC output)Excellent dynamic performance>75 dB SFDR @ 160 MHz (±100 kHz offset) AOUTSerial I/O control1.8 V power supplySoftware and hardware controlled power-down48-lead TQFP/EP packageSupport for 5 V input levels on most digital inputsPLL REFCLK multiplier (4× to 20×)Internal oscillator; can be driven by a single crystalPhase modulation capabilityMultichip synchronization
上傳時(shí)間： 2014-12-04
上傳用戶：axin881314
Features• Complete DTMF Receiver• Low power consumption• Internal gain setting amplifier• Adjustable guard time• Central office quality• Power-down mode• Inhibit mode• Backward compatible withMT8870C/MT8870C-1Applications• Receiver system for British Telecom (BT) orCEPT Spec (MT8870D-1)• Paging systems• Repeater systems/mobile radio• Credit card systems• Remote control• Personal computers• Telephone answering machine
上傳時(shí)間： 2013-11-20
上傳用戶：mpquest
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