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LTC2757A

Application Notes

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  1ppm Settling Time Measurement for a Monolithic 18-Bit DAC &mdash AN120
  PDF, 2.1 Мб, Файл опубликован: 10 мар 2010
  Performance requirements for instrumentation, function generation, inertial navigation systems, trimming, calibrators, ATE, medical apparatus and other precision applications are beginning to eclipse capabilities of 16-bit data converters. More specifi cally, 16-bit digital-to-analog converters (DACs) have been unable to provide required resolution in an increasing number of ultra-precision applications.
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  Application Note 120
  March 2010
  1ppm Settling Time Measurement
  for a Monolithic 18-Bit DAC
  When Does the Last Angel Stop Dancing on a Speeding Pinhead?
  Jim Williams
  Introduction
  Performance requirements for instrumentation, function
  generation, inertial navigation systems, trimming, calibrators, ATE, medical apparatus and other precision applications
  are beginning to eclipse capabilities of 16-bit data converters. More specifically, 16-bit digital-to-analog converters
  (DACs) have been unable to provide required resolution in
  an increasing number of ultra-precision applications.
  New components (see Components for 18-bit Digitalto-Analog Conversion, page 2) have made 18-bit DACs
  a practical design alternative1. These ICs provide 18-bit
  performance at reasonable cost compared to previous
  modular and hybrid technologies. The monolithic DACs
  DC and AC specifications approach or equal previous
  converters at significantly lower cost.
  DAC Settling Time
  DAC DC specifications are relatively easy to verify. Measurement techniques are well understood, albeit often tedious.
  AC specifications require more sophisticated approaches
  to produce reliable information. In particular, the settling
  time of a DAC and its output ampliп¬Ѓer is extraordinarily …

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