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Notas de Diseño

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  SOT-23 Micropower, Rail to Rail Op Amps Operate with Inputs Above the Positive Supply &mdash DN221
  PDF, 160 Kb, Archivo publicado: enero 1, 2001
  Extracto del documento

  SOT-23 Micropower, Rail-to-Rail Op Amps Operate with Inputs
  Above the Positive Supply – Design Note 221
  Raj Ramchandani
  Introduction
  The only SOT-23 op amps featuring Over-The-Top ® operation—the ability to operate with either or both inputs above
  the positive rail—are the 55µA LT®1782 and the 300µA
  LT1783. This feature is important in many current-sensing
  applications, where the inputs are required to operate at
  or above the supply. The wide supply voltage range, from
  2.7V to 18V, gives the LT1782/LT1783 broad appeal as
  general purpose amplifiers, while the guaranteed offset
  voltage of 950ВµV over temperature is the lowest of any
  SOT-23 op amp. There is even a shutdown feature for
  ultralow supply current applications.
  Tough General Purpose Op Amps
  The LT1782/LT1783 SOT-23 op amps are ideal for general
  purpose applications that demand excellent performance.
  These SOT-23 op amps are specified at input common
  mode voltages as high as 18V, independent of the supply
  voltage, making them ideal for applications with a wide
  input range requirement and/or unusual input conditions.
  In applications that require more bandwidth than the
  200kHz LT1782, the LT1783’s six-fold increase in supply …

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  Sense Milliamps to Kiloamps and Digitize to 12 Bits &mdash DN227
  PDF, 73 Kb, Archivo publicado: abr 1, 2001
  Extracto del documento

  Sense Milliamps to Kiloamps and Digitize to 12 Bits – Design Note 227
  Richard Markell and Glen Brisebois
  Introduction
  The LT®1787 high side current sense amplifier provides
  a precision measurement of current into or out of a
  power source. The part generates an output voltage that
  is directly proportional to the current flowing through
  an external current sense resistor. With a miniscule
  40ОјV (typical) input offset voltage, the LT1787 has a
  better than 12-bit, zero-cross accurate dynamic range
  at 250mV full-scale input. A hefty 60V maximum supply
  voltage specification allows the part to be used not only
  in low voltage battery applications but also in higher
  voltage telecom and industrial applications. Independent
  VEE and VBIAS pins make the application of the LT1787
  extremely versatile. Operation with an A/D Converter
  Figure 1 shows a detailed schematic of a high resolution
  (12-bit), bidirectional current-to-bits converter using
  an LT1787, the LT1783 SOT-23 1.2MHz micropower,
  rail-to-rail op amp and the LTC1404 SO-8 packaged,
  12-bit analog-to-digital converter with shutdown. The
  circuit, as shown, allows digitization of input current
  from approximately –3A to approximately 2A with …

• Descargar
  An Autoranging True RMS Converter &mdash DN339
  PDF, 77 Kb, Archivo publicado: jun 1, 2004
  Extracto del documento

  An Autoranging True RMS Converter – Design Note 339
  Philip Karantzalis and Jim Mahoney
  True RMS voltage detection is most commonly required
  to measure complex amplitude and time varying signals,
  such as machine or engine vibration monitoring and
  complex AC power line load monitoring. Sometimes
  these applications require accurate input signal measurement over an extremely wide dynamic range—even
  more than the 50dB range of the LTC1966. One solution
  is to add an autoranging function to the LTC1966, thus Introduction
  The LTC В®1966 is a true RMS-to-DC converter that uses
  a ∆Σ computational technique to make it dramatically
  simpler to use, significantly more accurate, lower in
  power consumption and more flexible than conventional log-antilog RMS-to-DC converters. The LTC1966
  RMS-to-DC converter has an input signal range from
  5mVRMS to 1.5VRMS (a 50dB dynamic range with a
  single 5V supply rail) and a 3dB bandwidth of 800kHz
  with signal crest factors up to four. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks
  of Linear Technology Corporation. All other trademarks are the property of their
  respective owners.
  LT1783 BUFFER RMS-DC CONVERTER 5V 0.01ОјF 5V 0.1ОјF
  2 3 AGND G2 INPUT 4 IN G1 V– G0 0.1μF 1 OUTPUT 5
  0.1ОјF 6
  –5V GND VSS 8 1 4 WINDOW …

Artículos

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  Boost Converter Drives 1A White LEDs &mdash LT Journal
  PDF, 86 Kb, Archivo publicado: mayo 1, 2004
  Extracto del documento

  DESIGN IDEAS Boost Converter Drives 1A White LEDs
  by Keith Szolusha
  White LEDs are brighter and more
  powerful than ever. High-power white
  LEDs, because of their extreme luminous density and ultra-compact size,
  are replacing conventional bulbs in
  flashlights, headlamps, streetlights,
  and many automotive applications—
  anywhere a conventional bulb might
  be found. Some new white LEDs,
  such as Lumileds’ Luxeon™ series,
  improve on conventional bulbs in several characteristics, including greater
  luminescence, improved response
  time, and increased durability with
  decreased size and cost.
  The challenge in using white LEDs
  in portable applications is powering
  them with the wide input voltage range
  that batteries present, such as 3.3V to
  4.2V from a lithium-ion. LEDs require
  constant current to maintain constant
  luminosity. The battery-LED DC/DC
  converter must both step up and step …

• Descargar
  SOT-23 Micropower, Rail-to-Rail Op Amps Operate with Inputs above the Positive Supply &mdash LT Journal
  PDF, 186 Kb, Archivo publicado: nov 1, 1999
  Extracto del documento

  LINEAR TECHNOLOGY
  NOVEMBER 1999 IN THIS ISSUE…
  COVER ARTICLE
  SOT-23 Micropower, Rail-to-Rail
  Op Amps Operate with Inputs above
  the Positive Supply . 1
  Raj Ramchandani Issue Highlights . 2
  LTC® in the News… . 2
  DESIGN FEATURES
  3ppm/В°C Micropower Reference Draws
  Only 50Вµ A and Operates on 2.8V
  . 4 VOLUME IX NUMBER 4 SOT-23 Micropower,
  Rail-to-Rail Op Amps
  Operate with Inputs
  above the Positive
  Supply
  by Raj Ramchandani John Wright Smart Battery Charger Is
  Programmed via the SMBus . 6
  Mark Gurries LTC1755 Smart Card Interface
  Provides Inductorless Boost and
  Signal-Level Translators . 11
  Steven Martin LTВ®1306: Synchronous Boost DC/DC
  Converter Disconnects Output …

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Clasificación del fabricante

• Signal Conditioning > Amplifiers > Operational Amplifiers (Op Amps) > Low Power Amplifiers (Is < 1mA/amp) | Precision Amplifiers (Vos | High Voltage Amplifiers (>12V) | Rail-to-Rail Amplifiers
• Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) Amplifiers

Otros nombres:

LT1783IS6TRMPBF, LT1783IS6 TRMPBF