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LT1499 LT1499

Application Notes

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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 …

Articles

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  Designing the LT1167 Instrumentation Amplifier into a Single 5V Supply Application &mdash LT Journal
  PDF, 119 Kb, File published: Jun 1, 1999
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  DESIGN IDEAS Designing the LT1167
  by Adolfo A. Garcia
  Instrumentation Amplifier
  into a Single 5V Supply Application
  Introduction Circuit Operation
  operate near the sensor or circuit’s
  positive supply voltage or ground
  (common). Even though the signal
  conditioning circuitry need not operate at the extremes of the supply
  voltage range, the output voltage swing
  of the circuit should be as large as
  possible for maximum dynamic range.
  The circuit illustrated in Figure 1
  achieves high precision performance
  while operating from a single 5V
  supply. The trick here is to reference
  the dual-supply instrumentation
  amplifier’s inputs to a stable midpoint supply and then follow the
  instrumentation amplifier with a
  single-supply precision operational
  amplifier with a rail-to-rail output
  stage. This “composite” instrumentation amplifier uses an LT1167 (a high
  performance instrumentation amplifier in an SO-8 package) for the input …

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Manufacturer's Classification

• Signal Conditioning > Amplifiers > Operational Amplifiers (Op Amps) > Precision Amplifiers (Vos | High Voltage Amplifiers (>12V) | Rail-to-Rail Amplifiers
• Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) Amplifiers

Other Names:

LT1498IS8PBF, LT1498IS8 PBF