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LTC1650A

Application Notes

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  Component and Measurement Advances Ensure 16-Bit DAC Settling Time &mdash AN74
  PDF, 980 Kb, File published: Jul 1, 1998
  DAC DC specifications are relatively easy to verify. AC specifications require more sophisticated approaches to produce reliable information. In particular, the settling time of the DAC and its output amplifier is extraordinarily difficult to determine to 16-bit resolution. This application note presents methods for 16-bit DAC settling time measurement and compares results. Appendices discuss oscilloscope overdrive, frequency compensation, circuit and optimization techniques, layout, power stages and a historical perspective of precision DACs.
  Extract from the document

  Application Note 74
  July 1998
  Component and Measurement Advances Ensure
  16-Bit DAC Settling Time
  The art of timely accuracy
  Jim Williams
  Introduction
  Instrumentation, waveform generation, data acquisition,
  feedback control systems and other application areas are
  beginning to utilize 16-bit data converters. More specifically, 16-bit digital-to-analog converters (DACs) have
  seen increasing use. New components (see Components
  for 16-Bit Digital-to-Analog Conversion, page 2) have
  made 16-bit DACs a practical design alternative1. These
  ICs provide 16-bit performance at reasonable cost compared to previous modular and hybrid technologies. The
  DC and AC specifications of the monolithic DAC’s
  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 the DAC and its output amplifier is
  extraordinarily difficult to determine to 16-bit resolution. …

Articles

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  Component and Measurement Advances Ensure 16-Bit DAC Settling Time (Part One) &mdash LT Journal
  PDF, 262 Kb, File published: Aug 1, 1998
  Extract from the document

  DESIGN INFORMATION Component and Measurement
  Advances Ensure 16-Bit DAC
  by Jim Williams
  Settling Time (Part One)
  Introduction
  Instrumentation, waveform generation, data acquisition, feedback
  control systems and other application
  areas are beginning to utilize 16-bit
  data converters. More specifically, 16bit digital-to-analog converters (DACs)
  have seen increasing use. New components (see the sidebar “Components
  for 16-Bit Digital-to-Analog Conversion” on page 31) have made 16-bit
  DACs a practical design alternative.
  These ICs provide 16-bit performance
  at reasonable cost compared to previous modular and hybrid technologies.
  The DC and AC specifications of the
  monolithic DACs 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 the DAC …

• Download
  New 16-Bit Bipolar Output DAC in Narrow SO-16 Package &mdash LT Journal
  PDF, 200 Kb, File published: Aug 1, 1998
  Extract from the document

  DESIGN INFORMATION
  switched output. The monolithic diode
  bridge is also temperature controlled,
  providing a bridge offset error below
  10Вµ V, stabilizing the measurement
  baseline. The temperature control is
  implemented using uncommitted
  diodes in the monolithic array as heater
  and sensor.
  Figure 5 details considerations for
  the diode bridge switch. The bridge
  diodes tend to cancel each other’s temperature coefficient—unstabilized
  bridge drift is about 100ВµV/В°C and the
  temperature control reduces residual
  drift to a few microvolts/В°C. Bridge temperature control is
  achieved by using one diode as a sensor. Another diode, running in reverse
  breakdown (V Z ≈ 7V), serves as the
  heater. The control amplifier, comparing the sensor diode to a voltage at its
  negative terminal, drives the heater
  diode to temperature stabilize the array.
  DC balance is achieved by trimming
  the bridge on-current for zero input–
  output offset voltage. Two AC trims are …

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Manufacturer's Classification

• Data Conversion > Digital-to-Analog Converters (DAC) > Voltage Output DACs | Bipolar Digital-to-Analog Converters (DAC)