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Notas de Diseño

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  Dual 25ВµV Micropower Op Amp Fits in 3mm x 3mm Package &mdash DN331
  PDF, 82 Kb, Archivo publicado: feb 2, 2004
  Extracto del documento

  Dual 25ВµV Micropower Op Amp Fits in 3mm Г— 3mm Package
  Design Note 331
  Glen Brisebois
  Introduction
  Conventional monolithic micropower op amps with a
  wide supply voltage range require a large die area and
  therefore, a large package and footprint. The unconventional LTВ®6011 dual op amp п¬Ѓts 25ОјV input precision
  micropower operation and wide 2.7V to 36V supply range
  in a tiny new package—its 3mm × 3mm DFN package
  is so small it doesn’t even have leads. The LT6011 also
  provides rail-to-rail output swing and utilizes superbeta
  input transistors to achieve picoampere input currents.
  Hall Sensor Amplifier
  Figure 1 shows the LT6011 applied as a low power Hall
  sensor amplifier. The magnetic sensitivity of a Hall sensor is proportional to the DC excitation voltage applied
  across it. With a 1V bias voltage, the sensitivity of this
  Hall sensor is specified as 4mV/mTesla of magnetic
  п¬Ѓeld. At that level of DC bias, however, the 400О© bridge
  consumes 2.5mA. Reducing the excitation voltage would
  reduce the power consumption, but it would also reduce
  the sensitivity. This is where the beauty of precision
  micropower amplification becomes especially apparent.
  The LT1790-1.25 micropower reference provides a …

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  Multiple Output Range 16-Bit DAC Design Made Simple &mdash DN337
  PDF, 76 Kb, Archivo publicado: mayo 1, 2004
  Extracto del documento

  Multiple Output Range 16-Bit DAC Design Made Simple
  Design Note 337
  Derek Redmayne
  of output ranges. However, with the new LTC В®1592
  multiple output range DAC, all of this complexity is
  unnecessary. Figure 2 shows the compact simplicity of
  an implementation based on the new LTC1592. All the
  standard industrial ranges (0V to 5V, 0V to 10V, В±5V,
  ±10V, ±2.5V and –2.5V to 7.5V) are provided, accurately
  and under software control. Introduction
  Precision 16-bit analog outputs with software-configurable output ranges are often needed in industrial
  process control equipment, analytical and scientific
  instruments and automatic test equipment. In the past,
  designing a universal output module was a daunting task
  and the cost and PCB real estate associated with this
  function were problematic, if not prohibitive. FigureВ 1
  shows an example of the circuitry formerly required
  to produce a programmable 16-bit DAC with a variety L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks
  and SoftSpan is a trademark of Linear Technology Corporation. All other trademarks
  are the property of their respective owners. U7 U6 5V
  REF + +
  U3 U10 10V U7 – –
  U6 SHDN 50k …

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  Generating a В±10.24V True Bipolar Input for an 18-Bit, 1Msps SAR ADC &mdash DN522
  PDF, 452 Kb, Archivo publicado: nov 26, 2013
  Extracto del documento

  Generating a В±10.24V True Bipolar Input for an 18-Bit, 1Msps
  SAR ADC
  Design Note 522
  Guy Hoover
  Introduction
  The LTC В®2338 is an 18-bit fully differential SAR ADC
  that is remarkably easy to drive. This 1Msps ADC operates from a single 5V supply and achieves В±4LSB INL
  maximum with –111dB THD and 100dB SNR. Its fully
  differential В±20.48V true bipolar input range minimizes
  the need for range scaling, and its 2kО© resistive input
  greatly reduces the charge kickback from the internal
  sampling capacitor.
  ADCs claiming similar performance require scaling
  to exceed what is typically a 0V to VREF input range,
  resulting in low impedance inputs or an additional
  buffer stage requirement. To band limit noise and
  minimize disturbances reflected into the buffer from
  sampling transients, other ADCs require filter circuitry
  composed of expensive film or C0G capacitors at the
  driver output. In contrast, the simple driver circuit
  presented here requires only a dual precision op amp
  and two resistors to drive the LTC2338-18. Layout
  strategies for this circuit are also shown. C59 …

Artículos

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  Dual Operational Amplifier Combines 16-Bit Precision with High Speed &mdash LT Journal
  PDF, 230 Kb, Archivo publicado: mayo 1, 2000
  Extracto del documento

  DESIGN FEATURES Dual Operational Amplifier Combines
  16-Bit Precision with High Speed
  by Kris Lokere
  Introduction
  The LT1469 is a dual operational
  amplifier that has been optimized for
  accuracy and speed in 16-bit systems. The amplifier settles in just
  900ns to 150ВµV for a 10V step. The
  LT1469 also features the excellent
  DC specifications required for 16-bit
  designs. Input offset voltage is 125ВµV
  maximum, input bias current is 10nA
  maximum for the inverting input and
  minimum DC gain is 300V/mV. The
  LT1469 specifications are summarized in Table 1.
  This article presents two applications of the LT1469 in 16-bit
  data-conversion systems. The first
  application is with a fast currentoutput digital-to-analog converter
  (DAC), such as the LTC1597. The
  dual LT1469 amplifier allows this
  DAC to operate in bipolar, 4-quadrant multiplying mode. The second
  application illustrates the use of this
  dual amplifier as a buffer for a differential analog-to-digital converter …

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• Signal Conditioning > Amplifiers > Operational Amplifiers (Op Amps) > High Speed Amplifiers (GBW > 50MHz) | Low Noise Amplifiers ( | High Voltage Amplifiers (>12V)