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LT1013 LT1013

Application Notes

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  Designing Linear Circuits for 5V Single Supply Operation &mdash AN11
  PDF, 230 Kb, File published: Sep 1, 1985
  This note covers the considerations for designing precision linear circuits which must operate from a single 5V supply. Applications include various transducer signal conditioners, instrumentation amplifiers, controllers and isolated data converters.
  Extract from the document

  Application Note 11
  September 1985
  Designing Linear Circuits for 5V Single Supply Operation
  Jim Williams
  In predominantly digital systems it is often necessary
  to include linear circuit functions. Traditionally, separate
  power supplies have been used to run the linear components (see Box, “Linear Power Supplies—Past, Present,
  and Future”).
  Recently, there has been increasing interest in powering
  linear circuits directly from the 5V logic rail. The logic
  rail is a difficult place for analog components to function.
  The high amplitude broadband current and voltage noise
  generated by logic clocking makes analog circuit operation difficult. (See Box, “Using Logic Supplies for Linear
  Functions”.)
  Generally speaking, analog circuitry which must achieve
  very high performance levels should be driven from dedicated supplies. The difficulties encountered in maintaining
  the lowest possible levels of noise and drift in an analog
  system are challenging enough without contending with
  a digitally corrupted power supply.
  Many analog applications, however, can be successfully
  implemented using the logic supply. Combining components intended to provide high performance from the 167Ω Q1 –
  + 2M L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
  Technology Corporation. All other trademarks are the property of their respective owners. RATIOMETRIC …

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  Risk Assessment Advice for High Reliability Amplifiers &mdash AN141
  PDF, 299 Kb, File published: Oct 7, 2013
  Extract from the document

  Application Note 141
  October 2013
  Risk Assessment Advice for High Reliability Amplifiers
  Tim Regan and James Mahoney Introduction
  In long life, high reliability systems, supplied power is
  provided only to essential circuitry. As a result many of
  the unpowered circuits may have voltages applied to inputs and outputs without proper supply biasing. As part
  of any diligent system safety risk assessment, a question
  often arises; will the unpowered components be damaged,
  degraded, or impair circuit performance under these
  abnormal operating conditions?
  The purpose of this article is to provide advice for what
  lies within the pins of several common amplifiers used in
  these applications. Most of the amplifiers of interest are the
  radiation hard amplifiers so indicated with a device prefix
  of RH. Another amplifier, the LT6016, is particularly robust
  with over, under and reversed polarity voltage conditions
  and is included for reference.
  With no power applied to the amplifier, forcing a voltage
  between two pins will cause a current to flow. The magnitude of this current differs from pin to pin and device to
  device. A curve tracer is used to show the current vs voltage
  characteristic when overdriving specific pin combinations.
  Referencing these curve trace plots will provide an indication of the magnitude of current flow for a particular …

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  Using the LTC Op Amp Macromodels &mdash AN48
  PDF, 297 Kb, File published: Nov 8, 1991
  LTC's op amp macromodels are described in detail, along with the theory behind each model and complete schematics of each topology. Extended modeling topics are discussed, such as phase/frequency response modifications and asymmetric slew rate for JFET op amp models. LTC's macromodels are optimized for accuracy and fast simulation times. Simulation times can be further reduced by using streamlining techniques found throughout AN48.
  Extract from the document

  Application Note 48
  November 1991
  Using the LTC Op Amp Macromodels
  Getting the Most from SPICE and the LTC Library
  Walt Jung INTRODUCTION This application note is an overview discussion of the
  Linear Technology SPICE macromodel library. It assumes
  little if any prior knowledge of this software library or its
  history. However, it does assume familiarity with both the
  analog simulation program SPICE (or one of its many
  derivatives), and modern day op amps, including bipolar,
  JFET, and MOSFET amplifier technologies.
  Some Preliminary SPICE Facts of Life
  In the past few years, SPICE simulations have really begun
  to capture a high level of attention on the part of analog
  circuit designers. Perhaps this is due to more affordable
  high performance computers, or perhaps the time for
  simulation is now upon us. In any event, the bottom line is
  that IC vendors are now making macromodels for op amps
  available to their customers.
  For the analog circuit designer, there can be no better fate
  for simulations, viewing this situation in terms of which
  model to use. Designers no longer need worry about
  whether the third party supplier’s model can really cut it. …

Design Notes

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  An LT1013 and LT1014 Op Amp SPICE Macromodel &mdash DN12
  PDF, 75 Kb, File published: Jul 1, 1988
  Extract from the document

  An Op Amp SPICE Macromodel
  Design Note 12
  Walter G. Jung
  applications library. It is hoped that eventually most
  op amps in the product line will be developed as macromodels and made available to customers. With the advent of low cost and powerful desktop computers, present day op amp circuit designs can mature
  more quickly with good simulation tools. One such tool
  since its inception has been SPICE, the standard analog
  circuit simulator. However, while PCs and workstations
  may now be present on more and more desks, a potential
  bottleneck towards effective simulation has been SPICE
  models for the more popular parts. The LTВ®1013 and LT1014 devices are popular single
  supply LTC op amps, and are thus logical candidates
  for macromodels. While existing macromodels for the
  generic 358 and 324 types might suffice for some applications, circuit designs which take advantage of the
  unique precision and functional features of the LT1013
  warrant a model which reflects those features. The
  schematic diagram of the LT1013 and LT1014 macromodel is shown in Figure 1, and is applicable to one
  channel of either device. The macromodel approach to simulation of an op amp
  is viable for many designs, with the great asset of
  simulation speeds far faster than that of a full devicelevel circuit. With this design note, Linear Technology
  Corporation introduces op amp macromodels to its L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks
  of Linear Technology Corporation. All other trademarks are the property of their
  respective owners. …

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  Noise Calculations in Op Amp Circuits &mdash DN15
  PDF, 224 Kb, File published: Sep 1, 1988
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  Noise Calculations1 in Op Amp Circuits – Design Note 15
  Alan Rich
  Noise calculations in op amp circuits are one of the most
  confused calculations that an analog engineer must
  perform.
  One cannot just look at noise specifications; the total op
  amp circuit including resistors and operating frequency
  range must be included in calculations for circuit noise. A
  “low” noise amplifier in one circuit will become a “high”
  noise amplifier in another circuit.
  As part of this Design Note, an IBM-PC2 or compatible
  computer program, NOISE, has been written to perform
  the noise calculations. This program allows the user to
  calculate circuit noise using LTC op amps, determine the
  best LTC op amp for a low noise application, display the
  noise data for LTC op amps, calculate resistor noise, and
  calculate circuit noise using noise specs for any op amp.
  At the end of this Design Note there are detailed operating
  instructions for the computer program NOISE.
  To calculate noise for an op amp circuit, one must consider the op amp voltage and current noise density and
  1/f corner frequency, the frequency range of interest, and
  the resistor noise.
  The most comprehensive specification for voltage or current noise is the noise density frequency response curve …

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  Operational Amplifier Selection Guide for Optimum Noise Performance &mdash DN3
  PDF, 224 Kb, File published: Oct 1, 1987
  Extract from the document

  Operational Amplifier Selection Guide for Optimum Noise
  Performance – Design Note 3
  George Erdi
  The LTВ®1028 is the lowest noise op amp available today.
  Its voltage noise is less than that of a 50О© resistor. In
  other words, if the LT1028 is operated with source resistors in excess of 50О© , resistor noise will dominate. If the
  application requires large source resistors, the LT1028’s
  relatively high current noise will limit performance, and
  other op amps will provide lower overall noise. The table below lists which op amp gives minimum total
  noise for a specified equivalent source resistance. A two
  step procedure should be followed to optimize noise: In general, the total noise of any op amp (referred to the
  input) is given by: The table actually has two sets of devices: one for low
  frequency (instrumentation), one for wideband applications. The slight differences between the two columns
  occur because voltage and current noise increase at low
  frequencies (below the so-called 1/f corner) while resistor
  noise is flat with frequency. total noise = (voltage noise) + (resistor noise) + (current noise R )
  2 2 2 eq where, (2) Enter the table to find the optimum op amp. Best Op Amp for Lowest Noise vs Source Resistance resistor noise = 0.13 Re q in nV Hz
  and Req = equivalent source resistance
  = R2 + R1//R3
  R3
  R1 – R2 + DN003 F01 Several conclusions can be reached by inspection of the
  equation:
  (a) To minimize noise, resistor values should be minimized to make the contribution of the second and …

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  Chopper vs Bipolar Op Amps—An Unbiased Comparison &mdash DN42
  PDF, 70 Kb, File published: Dec 1, 1990
  Extract from the document

  Chopper vs Bipolar Op Amps—An Unbiased Comparison
  Design Note 42
  George Erdi Table 1 lists the parameters of importance. In all input
  parameters (except noise) the advantage unquestionably goes to the choppers. 5ОјV maximum offset voltage, 0.5ОјV/В°C maximum drift are commonly found
  Table 1. Chopper Stabilized vs Precision Bipolar Op Amps
  ADVANTAGE
  PARAMETER
  Offset Voltage
  Offset Drift
  All Other DC Specs CHOPPER BIPOLAR COMMENTS
  вњ“
  вњ“
  вњ“ No Contest Wideband, 20Hz to
  1MHz вњ“ See Details in Text Noise вњ“ See Details in Text вњ“ Rail to Rail Swing
  2mA Limit on
  Choppers Output: Light Load
  Heavy Load
  Single Supply
  Application вњ“ вњ“ Inherent to
  Choppers Needs
  Special Design
  Bipolars В±15V Supply Voltage вњ“ Except LTC1150 Prejudice/Tradition вњ“ Still a Chopper
  Problem Cost 08/90/86_conv вњ“ Unless DC …

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  3V Operation of Linear Technology Op Amps &mdash DN56
  PDF, 78 Kb, File published: Feb 1, 1992
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  3V Operation of Linear Technology Op Amps -Design Note 56
  George Erdi
  The latest trend in digital electronics is the introduction
  of numerous ICs operating on regulated 3V or 3.3V
  power supplies. This is a logical development to increase
  circuit densities and to reduce power dissipation. In addition, many systems are directly powered by two AA
  cells or 3V lithium batteries. Clearly, analog ICs which
  work on 3V with good dynamic range to complement
  these digital circuits are, and will be, in great demand.
  Many Linear Technology operational amplifiers work
  well on a 3V supply. The purpose of this design note
  is to list these devices and their performance when
  powered by 3V. The op amps can be divided into two
  groups: single and dual supply devices. The single supply
  op amps are optimized for, and fully specified at, a 5V
  positive supply with the negative supply terminal tied
  to ground. Input common mode voltage range goes
  below ground, and the output swings to within a few
  millivolts of ground while sinking current. Members of
  the single supply family are the micropower LTВ®1077/
  LT1078/LT1079 single, dual and quad op amps with
  40μA supply current per amplifier, the LT1178/LT1179 dual and quad with 13μA per amplifier. The LT1006/
  LT1013/LT1014 single, dual and quad have faster speed …

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  Operational Amplifier Selection Guide for Optimum Noise Performance &mdash DN6
  PDF, 137 Kb, File published: Jan 1, 1988

Articles

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  Consider New Precision Amplifiers for Updated Industrial Equipment Designs &mdash LT Journal
  PDF, 154 Kb, File published: Sep 1, 2009
  Extract from the document

  L DESIGN FEATURES Consider New Precision Amplifiers for
  Updated Industrial Equipment Designs
  by Brian Black Introduction
  Industrial equipment is designed for
  long life cycles, so the electronic components used in industrial applications
  are often chosen with significant emphasis on proven performance, quality
  and reliability. Precision amplifiers are
  no exception. Even if new and innovative amplifiers become available over a
  product’s lifetime, a redesigned board
  is often built using the same proven
  op amps in the old board. Even for
  entirely new applications, designers
  will choose amplifiers that have proven
  their mettle in other circuits, making a
  choice based more on familiarity than
  performance.
  Although an amplifier may have
  been tried and proven in a design, it
  is not necessarily the best solution for
  every new design. Many can benefit
  from using more recently released
  amplifiers, which can improve overall
  system performance, reduce power …

Model Line

Manufacturer's Classification

• Signal Conditioning > Amplifiers > Operational Amplifiers (Op Amps) > Precision Amplifiers (Vos | High Voltage Amplifiers (>12V) | Low Power Amplifiers (Is < 1mA/amp)