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Другие варианты исполнения

LT1021 LT1021BCH-5 LT1021BCN8-10 LT1021BCN8-5 LT1021BCN8-7 LT1021CCN8-10 LT1021CCN8-5 LT1021CIN8-10 LT1021CIN8-5 LT1021DCN8-10 LT1021DCN8-5 LT1021DCN8-7 LT1021DCS8-10 LT1021DCS8-7 LT1021DIN8-10 LT1021DIN8-5

Application Notes

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  High Speed Comparator Techniques &mdash AN13
  PDF, 1.1 Мб, Файл опубликован: 1 апр 1985
  The AN13 is an extensive discussion of the causes and cures of problems in very high speed comparator circuits. A separate applications section presents circuits, including a 0.025% accurate 1Hz to 30MHz V/F converter, a 200ns 0.01% sample-hold and a 10MHz fiber-optic receiver. Five appendices covering related topics complete this note.
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  Application Note 13
  April 1985
  High Speed Comparator Techniques
  Jim Williams
  INTRODUCTION
  Comparators may be the most underrated and underutilized monolithic linear component. This is unfortunate
  because comparators are one of the most flexible and
  universally applicable components available. In large
  measure the lack of recognition is due to the IC op amp,
  whose versatility allows it to dominate the analog design
  world. Comparators are frequently perceived as devices,
  which crudely express analog signals in digital form—a
  1-bit A/D converter. Strictly speaking, this viewpoint is
  correct. It is also wastefully constrictive in its outlook.
  Comparators don’t “just compare” in the same way that
  op amps don’t “just amplify”.
  Comparators, in particular high speed comparators, can
  be used to implement linear circuit functions which are
  as sophisticated as any op amp-based circuit. Judiciously
  combining a fast comparator with op amps is a key to
  achieving high performance results. In general, op ampbased circuits capitalize on their ability to close a feedback
  loop with precision. Ideally, such loops are maintained
  continuously over time. Conversely, comparator circuits …

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  Designs for High Performance Voltage-to-Frequency Converters &mdash AN14
  PDF, 387 Кб, Файл опубликован: 1 мар 1986
  A variety of high performance V/F circuits is presented. Included are a 1Hz to 100MHz design, a quartz-stabilized type and a 0.0007% linear unit. Other circuits feature 1.5V operation, sine wave output an nonlinear transfer functions. A separate section examines the trade-offs and advantages of various approaches to V/F conversion.
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  Application Note 14
  March 1986
  Designs for High Performance Voltage-to-Frequency
  Converters
  Jim Williams
  Monolithic, modular and hybrid technologies have been
  used to implement voltage-to-frequency converters. A
  number of types are commercially available and overall
  performance is adequate to meet many requirements. In
  many cases, however, very high performance or special
  characteristics are required and available units will not work.
  In these instances V→F circuits specifically optimized for
  the desired parameters(s) are required. This application
  note presents examples of circuits which offer substantially improved performance over commercially available
  V→Fs. Various approaches (see Box Section, “V→F
  Design Techniques”) permit improvements in speed, dynamic range, stability and linearity. Other circuits feature
  low voltage operation, sine wave output and deliberate
  nonlinear transfer functions.
  Ultra-High Speed 1Hz to 100MHz V→F Converter
  Figure 1’s circuit uses a variety of circuit methods to
  achieve wider dynamic range and higher speed than any
  commercial V→F. Rocketing along at 100MHz full-scale
  (10% overrange to 110MHz is provided), it leaves all other …

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  Considerations for Successive Approximation A ->D Converters &mdash AN17
  PDF, 641 Кб, Файл опубликован: 1 дек 1985
  A tutorial on SAR type A/D converters, this note contains detailed information on several 12-bit circuits. Comparator, clocking, and preamplifier designs are discussed. A final circuit gives a 12-bit conversion in 1.8µs. Appended sections explain the basic SAR technique and explore D/A considerations.
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  Application Note 17
  December 1985
  Considerations for Successive Approximation
  A→D Converters
  Jim Williams
  conversion speeds below 2Ојs, although they are quite
  expensive. Because of these factors, it is often desirable to
  build, rather than buy, a high speed 12-bit SAR converter.
  Even in cases where high speed is not required, lower cost
  may still mandate building the circuit instead of using a
  monolithic device. The most popular A→D method employed today is the
  successive approximation register (SAR) converter (see
  Box, “The Successive Approximation Technique”). Numerous monolithic, hybrid and modular devices embodying
  the successive approximation technique are available, and
  monolithic devices are slowly gaining in performance.
  Nevertheless, hybrid and modular SAR types feature
  the best performance. In particular, at the 12-bit level,
  the fastest monolithic devices currently available require
  about 10Ојs to convert. Modular and hybrid units achieve LT1021
  R1
  15V
  7V
  1k …

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  Micropower Circuits for Signal Conditioning &mdash AN23
  PDF, 2.2 Мб, Файл опубликован: 1 апр 1987
  Low power operation of electronic apparatus has become increasingly desirable. AN23 describes a variety of low power circuits for transducer signal conditioning. Also included are designs for data converters and switching regulators. Three appended sections discuss guidelines for micropower design, strobed power operation and effects of test equipment on micropower circuits.
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  Application Note 23
  April 1987
  Micropower Circuits for Signal Conditioning
  Jim Williams
  Low power operation of electronic apparatus has become
  increasingly desirable. Medical, remote data acquisition,
  power monitoring and other applications are good candidates for battery driven, low power operation. Micropower
  analog circuits for transducer-based signal conditioning
  present a special class of problems. Although micropower
  ICs are available, the interconnection of these devices to
  form a functioning micropower circuit requires care. (See
  Box Sections, “Some Guidelines for Micropower Design
  and an Example” and “Parasitic Effects of Test Equipment
  on Micropower Circuits.”) In particular, trade-offs between
  signal levels and power dissipation become painful when
  performance in the 10-bit to 12-bit area is desirable. Additionally, many transducers and analog signals produce +V inherently small outputs, making micropower requirements complicate an already difficult situation. Despite the
  problems, design of such circuits is possible by combining
  high performance micropower ICs with appropriate circuit
  techniques.
  Platinum RTD Signal Conditioner
  Figure 1 shows a simple circuit for signal conditioning
  a platinum RTD. Correction for the platinum sensor’s
  nonlinear response is included. Accuracy is 0.25В°C over …

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  Some Thoughts on DC-DC Converters &mdash AN29
  PDF, 1.2 Мб, Файл опубликован: 1 окт 1988
  This note examines a wide range of DC/DC converter applications. Single inductor, transformer, and switched-capacitor converter designs are shown. Special topics like low noise, high efficiency, low quiescent current, high voltage, and wide-input voltage range converters are covered. Appended sections explain some fundamental properties of different types of converters.
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  Application Note 29
  October 1988
  Some Thoughts on DC/DC Converters
  Jim Williams and Brian Huffman
  INTRODUCTION
  Many systems require that the primary source of DC power
  be converted to other voltages. Battery driven circuitry is
  an obvious candidate. The 6V or 12V cell in a laptop computer must be converted to different potentials needed for
  memory, disc drives, display and operating logic. In theory,
  AC line powered systems should not need DC/DC converters
  because the implied power transformer can be equipped
  with multiple secondaries. In practice, economics, noise
  requirements, supply bus distribution problems and other
  constraints often make DC/DC conversion preferable. A
  common example is logic dominated, 5V powered systems
  utilizing В±15V driven analog components.
  The range of applications for DC/DC converters is large,
  with many variations. Interest in converters is commensurately quite high. Increased use of single supply powered
  systems, stiffening performance requirements and battery
  operation have increased converter usage.
  Historically, efficiency and size have received heavy emphasis. In fact, these parameters can be significant, but
  often are of secondary importance. A possible reason
  behind the continued and overwhelming attention to size …

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  Voltage Reference Circuit Collection &mdash AN42
  PDF, 1.7 Мб, Файл опубликован: 1 июн 1991
  A wide variety of voltage reference circuits are detailed in this extensive guidebook of circuits. The detailed schematics cover simple and precision approaches at a variety of power levels. Included are 2 and 3 terminal devices in series and shunt modes for positive and negative polarities. Appended sections cover resistor and capacitor selection and trimming techniques.
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  Bridge Circuits &mdash AN43
  PDF, 3.8 Мб, Файл опубликован: 1 июн 1990
  Subtitled "Marrying Gain and Balance," this note covers signal conditioning circuits for various types of bridges. Included are transducer bridges, AC bridges, Wien bridge oscillators, Schottky bridges, and others. Special attention is given to amplifier selection criteria. Appended sections cover strain gauge transducers, understanding distortion measurements, and historical perspectives on bridge readout mechanisms and Wein bridge oscillators.
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  Application Note 43
  June 1990
  Bridge Circuits
  Marrying Gain and Balance
  Jim Williams
  Bridge circuits are among the most elemental and powerful
  electrical tools. They are found in measurement, switching, oscillator and transducer circuits. Additionally, bridge
  techniques are broadband, serving from DC to bandwidths
  well into the GHz range. The electrical analog of the mechanical beam balance, they are also the progenitor of all
  electrical differential techniques. and stability of the basic configuration. In particular, transducer manufacturers are quite adept at adapting the bridge
  to their needs (see Appendix A, “Strain Gauge Bridges”).
  Careful matching of the transducer’s mechanical characteristics to the bridge’s electrical response can provide a
  trimmed, calibrated output. Similarly, circuit designers
  have altered performance by adding active elements (e.g.,
  amplifiers) to the bridge, excitation source or both. Resistance Bridges
  Figure 1 shows a basic resistor bridge. The circuit is
  usually credited to Charles Wheatstone, although S. H.
  Christie, who demonstrated it in 1833, almost certainly
  preceded him.1 If all resistor values are equal (or the two
  sides ratios are equal) the differential voltage is zero. The
  excitation voltage does not alter this, as it affects both
  sides equally. When the bridge is operating off null, the
  excitation’s magnitude sets output sensitivity. The bridge …

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  Data Acquisition Circuit Collection &mdash AN62
  PDF, 349 Кб, Файл опубликован: 1 окт 1994
  This application note presents a wide variety of data acquisition circuits. The detailed circuit schematics cover 8-, 10-, and 12- bit ADC and DAC applications, serial and parallel digital interfaces, battery monitoring, temperature sensing, isolated interfaces, and connections to various popular microprocessors and microcontrollers. An appendix covers suggested voltage references.
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  Application Note 62
  October 1994
  Data Acquisition Circuit Collection
  Kevin R. Hoskins
  INTRODUCTION
  This application note features 8-, 10-, and 12-bit data
  acquisition components in various circuit configurations.
  The circuits include battery monitoring, temperature sensing, isolated serial interfaces, and microprocessor and
  microcontroller serial and parallel interfaces. Also included are voltage reference circuits (Application Note 42
  contains more voltage reference circuits). Additional circuit information is located in the information
  references listed in the Circuit Index. Each information
  reference refers to either an application note (example:
  AN42 = Application Note 42), a data sheet (example:
  LTCВ®1292 DS = LTC1292 Data Sheet), or a design note
  (example: DN66 = Design Note 66).
  and LTC are registered trademarks and LT is a trademark of Linear Technology Corporation. CIRCUIT INDEX
  FIGURE TITLE
  FIGURE NO.
  General Analog-to-Digital Application Circuits
  Two-Quadrant 150kHz Bandwidth Analog Multiplier . Figure 1 .
  Infinite Hold-Time Sample-and-Hold (tACQ = 240ns) . Figure 2 .
  Four-Quadrant 250kHz Bandwidth Analog Multiplier . Figure 3 .
  Demodulating a Signal Using Undersampling . Figure 4 . …

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  Some Techniques for Direct Digitization of Transducer Outputs &mdash AN7
  PDF, 297 Кб, Файл опубликован: 1 фев 1985
  Analog-to-digital conversion circuits which directly digitize low level transducer outputs, without DC preamplification, are presented. Covered are circuits which operate with thermocouples, strain gauges, humidity sensors, level transducers and other sensors.
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  Application Note 7
  February 1985
  Some Techniques for Direct Digitization of Transducer Outputs
  Jim Williams
  Almost all transducers produce low level signals. Normally,
  high accuracy signal conditioning amplifiers are used to
  boost these outputs to levels which can easily drive cables,
  additional circuitry, or data converters. This practice raises
  the signal processing range well above the error floor,
  permitting high resolution over a wide dynamic range.
  Some emerging trends in transducer-based systems are
  causing the use of signal conditioning amplifiers to be
  reevaluated. While these amplifiers will always be useful,
  their utilization may not be as universal as it once was.
  In particular, many industrial transducer-fed systems are
  employing digital transmission of signals to eliminate
  noise-induced inaccuracies in long cable runs. Additionally, the increasing digital content of systems, along with
  pressures on board space and cost, make it desirable to
  digitize transducer outputs as far forward in the signal chain
  as possible. These trends point toward direct digitization
  of transducer outputs—a difficult task.
  Classical A/D conversion techniques emphasize high level
  input ranges. This allows LSB step size to be as large …

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  Component and Measurement Advances Ensure 16-Bit DAC Settling Time &mdash AN74
  PDF, 980 Кб, Файл опубликован: 1 июл 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.
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  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. …

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  Understanding and Applying Voltage References &mdash AN82
  PDF, 172 Кб, Файл опубликован: 1 ноя 1999
  Just how do bandgaps and buried Zeners stack up against Weston cells? Did you know your circuit board may induce more drift in a reference than time and temperature? Learn the answers to these and other commonly asked reference questions ranging from burn-in recommendations to ΔVBE generation in this Application Note.
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  Application Note 82
  November 1999
  Understanding and Applying Voltage References 30
  2 4 20
  8 3
  10 –20
  16
  32 4
  –30 5 Today’s IC reference technology is divided along two
  lines: bandgap references, which balance the temperature coefficient of a forward-biased diode junction against
  that of a ∆VBE (see Appendix B); and buried Zeners (see
  Appendix A), which use subsurface breakdown to achieve
  outstanding long-term stability and low noise. With few
  exceptions, both reference types use additional on-chip
  circuitry to further minimize temperature drift and trim
  output voltage to an exact value. Bandgap references are
  generally used in systems of up to 12 bits; buried Zeners
  take over from there in higher accuracy systems.
  , LTC and LT are registered trademarks of Linear Technology Corporation. –1 5
  3
  2 64 6
  1 –40 As with other specialized electronic fields, the field of
  monolithic references has its own vocabulary. We’ve …

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  A Standards Lab Grade 20-Bit DAC with 0.1ppm/В° Drift: The Dedicated Art of Digitizing One Part Per Million &mdash AN86
  PDF, 540 Кб, Файл опубликован: 1 янв 2001
  This publication details a true 1ppm D-to-A converter. Total DC error of this processor corrected DAC remains within 1ppm from 18-32°C, including reference drift. DAC error exclusive of reference drift is substantially better. Construction details and performance verification techniques are included, along with a complete software listing.
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  Application Note 86
  January 2001
  A Standards Lab Grade 20-Bit DAC with 0.1ppm/В°C Drift
  The Dedicated Art of Digitizing One Part Per Million
  Jim Williams
  J. Brubaker
  P. Copley
  J. Guerrero
  F. Oprescu INTRODUCTION
  Significant progress in high precision, instrumentation
  grade D-to-A conversion has recently occurred. Ten years
  ago 12-bit D-to-A converters (DACs) were considered
  premium devices. Today, 16-bit DACs are available and
  increasingly common in system design. These are true
  precision devices with less than 1LSB linearity error and
  1ppm/В°C drift.1 Nonetheless, there are DAC applications
  that require even higher performance. Automatic test
  equipment, instruments, calibration apparatus, laser trimmers, medical electronics and other applications often
  require DAC accuracy beyond 16 bits. 18-bit DACs have
  been produced in circuit assembly form, although they are
  expensive and require frequent calibration. 20 and even
  23+ (0.1ppm!) bit DACs are represented by manually
  switched Kelvin-Varley dividers. These devices, although …

Design Notes

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  Electrically Isolating Data Acquisition Systems &mdash DN10
  PDF, 73 Кб, Файл опубликован: 1 май 1988
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  Electrically Isolating Data Acquisition Systems
  Design Note 10
  Guy Hoover and William Rempfer
  Introduction
  In data acquisition systems it is often necessary to
  electrically isolate the measurement points from the
  system controller. Reasons for the electrical isolation
  include the following: to allow floating measurements
  at high voltages; for safety, to reduce the danger of
  electrical shock, as might occur in medical applications;
  and to eliminate ground loops between measurement
  points and the system controller which can cause errors.
  The data transmitted over the isolated lines can be
  either analog or digital. Analog signals have poor noise
  immunity and one isolator is required for each signal
  point. Traditionally, the highly noise immune, digitally
  encoded signals required many isolated lines for each
  channel. Now, with the LTCВ®1090 family of serial data
  acquisition systems, it is possible to transmit eight
  channels of data with only four isolated lines. Each
  additional eight channels requires only one additional
  isolated line.
  Both opto isolators and pulse transformers could be …

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  Micropower ADC and DAC in SO-8 Give PCs a 12-Bit Analog Interface &mdash DN138
  PDF, 78 Кб, Файл опубликован: 3 сен 1996
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  Micropower ADC and DAC in SO-8 Give PCs
  a 12-Bit Analog Interface – Design Note 138
  Kevin R. Hoskins
  Introduction
  Adding two channels of analog input/output to a PC
  computer is simple, inexpensive, low powered and
  compact when using the LTC В®1298 ADC and LTC1446
  DAC. The LTC1298 and the LTC1446 are the п¬Ѓrst SO-8
  packaged 2-channel devices of their kind. While the
  application shown is for PC data acquisition, the two
  converters provide the smallest, lowest power solutions
  for many other analog I/O applications. PC 2-Channel Analog I/O Interface
  The circuit shown in Figure 1 connects to a PC’s serial
  interface using four interface lines: DTR, RTS, CTS and
  TX. DTR is used to transmit the serial clock signal, RTS
  is used to transfer data to the DAC and ADC, CTS is
  used to receive conversion results from the LTC1298,
  and the signal on TX selects either the LTC1446 or
  the LTC1298 to receive input data. The LTC1298’s and
  LTC1446’s low power dissipation allow the circuit to
  be powered from the serial port. The TX and RTS lines
  charge capacitor C4 through diodes D5 and D6. An
  LTВ®1021-5 regulates the voltage to 5V. Returning the …

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  A Two Wire Isolated and Powered 10-Bit Data Acquisition System &mdash DN19
  PDF, 81 Кб, Файл опубликован: 1 янв 1989
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  A Two Wire Isolated and Powered 10-Bit Data Acquisition Sytem
  Design Note 19
  Guy Hoover and William Rempfer
  Introduction
  For reasons of safety or to eliminate error producing
  ground loops, it is often necessary to provide electrical
  isolation between measurement points and the microprocessor. Unfortunately, the isolated side of this measurement system must still be provided with power. One
  alternative is to power the isolated side of the circuit with
  batteries. This solution works if power consumption is
  low, environmental conditions are mild and the batteries
  are easily accessible. If these conditions are not met a
  separate isolated supply may be constructed. This can be
  both difficult and expensive. This design note describes
  a transformer isolated system in which one small pulse
  transformer provides both power and a data path.
  The circuit of Figure 1 is a 10-bit data acquisition system
  with 700V of isolation. The circuit takes advantage of the
  serial architecture of the LTC В®1092 which allows data
  and power to be transmitted using only one transformer.
  A 10-bit conversion can be completed and the data transferred to the microprocessor in 100Ојs. Using standard
  ribbon cable the isolated side of this circuit has been remotely located as much as 50 feet from the transformer
  without affecting circuit performance.
  Circuit Description …

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  A Single Supply RS232 Interface for Bipolar A to D Converters &mdash DN29
  PDF, 455 Кб, Файл опубликован: 1 дек 1989
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  A Single Supply RS232 Interface for Bipolar A to D Converters
  Design Note 29
  Sean Gold
  system. Construction also requires close attention to the
  layout of the system grounds and other aspects of circuit
  board design to avoid noise problems.2 Designing circuitry for single supply operation is often an
  attractive simplification for reducing production costs. Yet
  many applications call for just a few additional supplies to
  solve simple interface problems. The example presented
  here describes how an advanced RS232 interface can simplify an A to D converter which processes bipolar signals. To accommodate bipolar inputs (–5 < VIN < 5), the
  LTC1094’s negative rail must be biased beyond the extreme
  signal swing, but below absolute maximum ratings for
  supplies. A 5.6V Zener diode, D1, provides a sufficient
  bias because the V– pin draws very little current. The LT®1180 RS232 transceiver includes a charge pump
  which produces low ripple supplies with sufficient surplus
  current to drive a CMOS A to D converter and precision
  voltage reference. The circuit in Figure 1 operates from
  a single 5V supply, and draws a total quiescent current
  of only 37mA. These features make the circuit ideal for
  applications which must process bipolar signals with
  minimal support electronics. The A to D converter communicates with a remote controller via three wires, which carry the clock, the configuration
  word, and the output data. The chip select signal, CS, is
  generated from the incoming clock with a peak detector, …

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  250ksps, 16-Bit Micropower ADC Offers an Excellent Combination of SIze, Power and Speed &mdash DN294
  PDF, 54 Кб, Файл опубликован: 2 сен 2002
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  advertisement 250ksps, 16-Bit Micropower ADC Offers an Excellent
  Combination of Size, Power and Speed – Design Note 294
  Guy Hoover MSOP Package for Portable Applications
  Available in the MSOP package, the LTC1864 is well suited
  for portable applications where space is limited. As seen
  in Figure 1, the MSOP package provides considerable
  space savings over other serial parts available in 20-lead
  SW or 28-lead SSOP packages. 20-LEAD SW 28-LEAD SSOP MSOP
  DN294 F01 Figure 1. This 16-Bit ADC—Available in the Tiny MSOP
  Package—is an Obvious Space Saver Over Other Serial
  ADCs Low ADC Supply Current for
  Battery-Operated Applications
  With a typical supply current of only 850ВµA at the
  maximum sample rate of 250ksps, the LTC1864 already
  has one of the lowest power consumptions of any 16-bit
  ADC available. After a conversion, the LTC1864 goes into
  a low power SLEEP mode (ICC = 1nA typ, ICC = 3ВµA max)
  further reducing supply current. The LTC1864 can therefore run at true micropower levels in applications that do
  not require the maximum LTC1864 sampling rate. At
  1ksps, the supply current is typically only 2ВµA as shown
  in Figure 2. The part’s low power consumption combined with the ability to go into sleep mode after a
  09/02/294 1000 100 SUPPLY CURRENT (ВµA) Introduction
  The demand for ever smaller portable devices is increasing. In addition, there is a corresponding demand for …

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  12-Bit 8-Channel Data Acquisition System Interfaces to IBM PC Serial Port &mdash DN35
  PDF, 101 Кб, Файл опубликован: 1 июн 1990
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  12-Bit 8-Channel Data Acquisition System Interfaces to IBM PC
  Serial Port – Design Note 35
  Guy Hoover and William Rempfer
  IBM PCs Collect Analog Data
  IBM PC compatibles can be found just about everywhere.
  In those instances where a PC is not already in place,
  battery operated portables are readily available. This
  makes the PC a good choice for controlling a data acquisition system. Typically, such data acquisition systems
  have been expensive. Using dedicated A/D cards or
  IEEE-488 controllers and instruments, these systems
  tie up slots in the PC and are not readily transportable
  from one machine to another. As an alternative, the
  schematic of Figure 1 shows a 12-bit, 8-channel data
  acquisition system that connects to the serial port of
  the PC. This system uses an LTC В®1290, a reference,
  a handful of other low cost components and requires
  12 lines of BASIC to transfer data into the PC. If only
  ten bits of resolution are required the LTC1290 can be
  replaced with an LTC1090. Additionally, if the LTC1090
  is used, the system can be powered directly from the
  PC serial port with the option shown. Two Glue Chips Provide the Interface
  The control and status lines of the PC serial port are
  used to send data to and receive data from the LTC1290. …

Статьи

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  Component and Measurement Advances Ensure 16-Bit DAC Settling Time (Part One) &mdash LT Journal
  PDF, 262 Кб, Файл опубликован: 1 авг 1998
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  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 …

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  How to Choose a Voltage Reference &mdash LT Journal
  PDF, 282 Кб, Файл опубликован: 1 мар 2009
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  L DESIGN FEATURES How to Choose a Voltage Reference
  by Brendan Whelan Why Voltage References? 5V It is an analog world. All electronic
  devices must in some way interact with
  the “real” world, whether they are in
  an automobile, microwave oven or cell
  phone. To do that, electronics must be
  able to map real world measurements
  (speed, pressure, length, temperature)
  to a measurable quantity in the electronics world (voltage). Of course, to
  measure voltage, you need a standard
  to measure against. That standard is
  a voltage reference. The question for
  any system designer is not whether he
  needs a voltage reference, but rather,
  which one?
  A voltage reference is simply that—a
  circuit or circuit element that provides
  a known potential for as long as the circuit requires it. This may be minutes,
  hours or years. If a product requires
  information about the world, such VIN 18k LTC1286
  1
  2 LT1634-4.096 0.1ВµF 3
  4 VREF VCC +IN CLK –IN DOUT GND CS/SHDN 8 5V 7 …

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  Dual Operational Amplifier Combines 16-Bit Precision with High Speed &mdash LT Journal
  PDF, 230 Кб, Файл опубликован: 1 май 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 …

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Классификация производителя

• Space & Harsh Environment > Military Hermetic (M)
• Signal Conditioning > Voltage References > Series Voltage References
• Space & Harsh Environment > Space Qualified Products > Space Qualified Voltage References
• Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) Voltage References

Варианты написания:

LT1021DCS8-5TRPBF, LT1021DCS8-5 TRPBF, LT1021DCS85#TRPBF, LT1021DCS8 5#TRPBF