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
The MAX3243E device consists of three line drivers, five line receivers, and a dual charge-pump circuit with±15-kV ESD (HBM and IEC61000-4-2, Air-Gap Discharge) and ±8-kV ESD (IEC61000-4-2, Contact Discharge)protection on serial-port connection pins. The device meets the requirements of TIA/EIA-232-F and provides theelectrical interface between an asynchronous communication controller and the serial-port connector. Thiscombination of drivers and receivers matches that needed for the typical serial port used in an IBM PC/AT, orcompatible. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-Vsupply. In addition, the device includes an always-active noninverting output (ROUT2B), which allowsapplications using the ring indicator to transmit data while the device is powered down. The device operates atdata signaling rates up to 250 kbit/s and a maximum of 30-V/ms driver output slew rate.
標(biāo)簽：
MULTICHANNEL
5.5
TO
RS
上傳時(shí)間：
2013-10-19
上傳用戶：ddddddd
The #1 Step-by-Step Guide to labviewNow Completely Updated for labview 8!
Master labview 8 with the industry's friendliest, most intuitive tutorial: labview for Everyone, Third Edition. Top labview experts Jeffrey Travis and Jim Kring teach labview the easy way: through carefully explained, step-by-step examples that give you reusable code for your own projects!
This brand-new Third Edition has been fully revamped and expanded to reflect new features and techniques introduced in labview 8. You'll find two new chapters, plus dozens of new topics, including Project Explorer, AutoTool, XML, event-driven programming, error handling, regular expressions, polymorphic VIs, timed structures, advanced reporting, and much more. Certified labview Developer (CLD) candidates will find callouts linking to key objectives on NI's newest exam, making this book a more valuable study tool than ever.
Not just what to d why to do it!
Use labview to build your own virtual workbench
Master labview's foundations: wiring, creating, editing, and debugging VIs; using controls and indicators; working with data structures; and much more
Learn the "art" and best practices of effective labview development
NEW: Streamline development with labview Express VIs
NEW: Acquire data with NI-DAQmx and the labview DAQmx VIs
NEW: Discover design patterns for error handling, control structures, state machines, queued messaging, and more
NEW: Create sophisticated user interfaces with tree and tab controls, drag and drop, subpanels, and more
Whatever your application, whatever your role, whether you've used labview or not, labview for Everyone, Third Edition is the fastest, easiest way to get the results you're after!
標(biāo)簽：
Everyone
LabVIEW
for
英文
上傳時(shí)間：
2013-10-14
上傳用戶：shawvi
Abstract: Engineers often wish that radio susceptibility (RS) or radio immunity could be cured with an antibiotic, a vaccine, or someform of cure-all. Unfortunately, solving the RS problem is not that easy. Indeed, the laws of physics apply. In this article we discusssources of RS. We also offer tips and hints to protect systems, power supplies, printed circuit boards (PCBs), and electroniccomponents from radio frequency interference.
標(biāo)簽：
Susceptibility
Radio
無線電干擾
上傳時(shí)間：
2014-12-30
上傳用戶：旗魚旗魚
