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LTC1591 LTC1591 LTC1597 LTC1597A

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. …

Design Notes

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  Selecting Op Amps for Precision 16-Bit DACs &mdash DN214
  PDF, 76 Kb, File published: Oct 1, 1999
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  Selecting Op Amps for Precision 16-Bit DACs – Design Note 214
  Kevin R. Hoskins, Jim Brubaker and Patrick Copely
  The LTC В®1597 16-bit current output DAC offers a new
  level of accuracy and cost efficiency. It has exceptionally high accuracy and low drift: ±1LSB (max) INL and
  DNL over temperature. It eliminates costly external
  resistors in bipolar applications because it includes
  tightly trimmed, on-chip 4-quadrant resistors. To help
  achieve the best circuit DC performance, this design
  note offers two sets of easy-to-use design equations for
  evaluating an op amp’s effects on the DAC’s accuracy
  in terms of INL, DNL, offset (unipolar), zero (bipolar),
  unipolar and bipolar gain errors. With this information,
  selecting an op amp that gives the accuracy you need
  in a unipolar or bipolar application is easy.
  Figure 1 shows a unipolar application that combines the
  LTC1597 DAC and LTВ®1468 fast settling op amp. The
  equations for evaluating the effects of the op amp on
  the DAC’s accuracy are shown in Table 1. Quick work on
  Table 1’s equations with a calculator gives the results
  shown in Table 2. These are the changes the op amp can cause to the INL, DNL, unipolar offset and gain error
  of the DAC. Note, all are substantially less than 1LSB.
  Thus, the LT1468 is an excellent choice.
  The LTC1597’s internal design is very insensitive to …

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
  16-Bit Parallel DAC Has 1LSB Linearity, Ultralow Glitch and Accurate 4-Quadrant Resistors &mdash LT Journal
  PDF, 118 Kb, File published: Feb 1, 1999
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  DESIGN FEATURES 16-Bit Parallel DAC Has 1LSB Linearity,
  Ultralow Glitch and Accurate
  by Patrick Copley
  4-Quadrant Resistors
  Today’s fast paced marketplace has
  developed a major appetite for high
  resolution, high accuracy, fast digital-to-analog converters. System
  requirements in instrumentation,
  automatic test equipment, communications, waveform generation, data
  acquisition and feedback control systems, among many other applications,
  have fueled the need for 16-bit digitalto-analog converters. Not only does
  the converter need to meet the stringent speed and accuracy requirements
  of the system, it needs to do so in both
  unipolar (0V to 10V) and bipolar (В±10V)
  modes of operation without degradation. To meet and exceed these
  requirements, Linear Technology
  introduces its LTC1597 16-bit parallel, current output, low glitch,
  multiplying DAC with 4-quadrant
  resistors. Key features of the new
  DAC include: вќЏ В±1LSB maximum INL and DNL
  over the industrial temperature
  range
  вќЏ On-chip 4-quadrant resistors …

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  A Composite Amplifier Topology Wrings More Performance Out of the LTC1597 16-Bit Current Output DAC &mdash LT Journal
  PDF, 146 Kb, File published: Mar 1, 2002
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  DESIGN IDEAS A Composite Amplifier Topology
  Wrings More Performance Out of the
  LTC1597 16-Bit Current Output DAC
  by Derek Redmayne
  The LTC1597 16-bit current output
  DAC is capable of settling in the neighborhood of 1.7Вµs to 2Вµs using the
  16-bit accurate LT1468 as an I-V
  converter1. For applications needing
  higher throughput such as in-circuit
  testing, electrostatic sorting of organic materials, or electrostatic
  actuation of MEMS as examples, 1Вµs
  settling seems to be a common goal.
  This article shows a composite
  amplifier that can achieve settling in
  1Вµs.
  The topology shown in Figure 1
  combines the low noise, low offset,
  low input current qualities of the
  LT1468, with the fast slewing output
  of the LT1227. The output of the first
  stage is still taken as the node that
  drives the compensation capacitor,
  but the second stage, the LT1227, …

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  Dual Operational Amplifier Combines 16-Bit Precision with High Speed &mdash LT Journal
  PDF, 230 Kb, File published: May 1, 2000
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  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 …

• Download
  LT1468: An Operational Amplifier for Fast, 16-Bit Systems &mdash LT Journal
  PDF, 221 Kb, File published: Nov 1, 1998
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  DESIGN FEATURES LT1468: An Operational Amplifier
  for Fast, 16-Bit Systems
  by George Feliz
  Introduction
  The LT1468 is a single operational
  amplifier that has been optimized for
  accuracy and speed in 16-bit systems. Operating from В±15V supplies,
  the LT1468 in a gain of –1 configuration will settle in 900ns to 150µ V for
  a 10V step. The LT1468 also features
  the excellent DC specifications
  required for 16-bit designs. Input offset voltage is 75Вµ V max, input bias
  current is 10nA maximum for the
  inverting input and 40nA maximum
  for the noninverting input and DC
  gain is 1V/ВµV minimum. The LT1468
  specifications are summarized in
  Table 1. Two key applications that
  illustrate its use are current-to-voltage (I/V) conversion following a fast,
  16-bit current output digital-to-analog converter (DAC), such as LTC1597
  (Figure 1), and buffering the input of
  an analog-to-digital converter (ADC),
  such as the 333ksps LTC1604 (Figure 2). Both applications will be
  discussed in detail to highlight the …

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Manufacturer's Classification

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