Datasheet Linear Technology LTC6652BHLS8-5

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LTC6652 LTC6652AHLS8-2.5 LTC6652AHLS8-4.096 LTC6652AHLS8-5 LTC6652AHMS8-1.25 LTC6652AHMS8-2.048 LTC6652AHMS8-2.5 LTC6652AHMS8-3 LTC6652AHMS8-3.3 LTC6652AHMS8-4.096 LTC6652AHMS8-5 LTC6652BHLS8-2.5 LTC6652BHLS8-4.096 LTC6652BHMS8-1.25 LTC6652BHMS8-2.048 LTC6652BHMS8-2.5 LTC6652BHMS8-3 LTC6652BHMS8-3.3 LTC6652BHMS8-4.096 LTC6652BHMS8-5

Design Notes

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  Don't Be Fooled By Voltage Reference Long-Term Drift and Hysteresis &mdash DN229
  PDF, 98 Kb, File published: Apr 3, 2001
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  Don’t Be Fooled by Voltage Reference Long-Term Drift
  and Hysteresis – Design Note 229
  John Wright Lies About Long-Term Drift
  Some manufacturers are now touting phenomenal
  long-term drift specifications, based on accelerated
  high temperature testing. THIS IS A DELIBERATE
  LIE! Long-term drift cannot be extrapolated from
  accelerated high temperature testing. The only way
  long-term drift can be determined is to measure it over
  the time interval of interest. The erroneous technique
  produces numbers that are wildly optimistic and uses
  the Arrhenius Equation to derive an acceleration factor
  from elevated temperature readings. The equation is:
  AF = e EA вЋ› 1 1 вЋћ
  ⎜ – ⎟
  K вЋќ T1 T2вЋ  where: E A = Activation Energy (Assume 0.7)
  K = Boltzmann’s Constant
  T2 = Test Condition in В°Kelvin
  T1 = Use Condition Temperature in В°Kelvin Equation the acceleration factor is 767 and the projected
  “bogus” long-term drift is 0.156ppm/1000hr at 30°C.
  For a 2.5V reference, this corresponds to a 0.39ОјV shift
  after 1000 hours. This is pretty hard to determine (read
  impossible) if the peak-to-peak output noise is larger …

Articles

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  Reliable Precision Voltage Reference with 5ppm/°C Drift is Factory Trimmed and Tested at -40°C, 25°C and 125°C &mdash LT Journal
  PDF, 494 Kb, File published: Jan 1, 2009
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  DESIGN FEATURES L Reliable Precision Voltage Reference
  with 5ppm/В°C Drift is Factory Trimmed
  and Tested at –40°C, 25°C and 125°C
  by Michael B. Anderson and Brendan Whelan The LTC6652 reference is a precision
  low drift voltage reference that includes
  advanced curvature compensation
  circuitry and post-package trim. To
  guarantee reliable performance, these
  parts are tested at –40°C, 25°C and
  125В°C to verify they meet specification
  across the entire temperature range.
  This comprehensive testing ensures
  that the LTC6652 can be used with
  confidence in demanding applications. One result of this testing is
  demonstrated in Figure 1. The output
  voltage versus temperature for several
  randomly chosen parts shows a drift
  characteristic that is consistent from
  part to part. This is a result of a propriLinear Technology Magazine January 2009 Compare the Real Specs:
  Is the Temperature Range
  Operating or Functional? When comparing voltage references for
  use in demanding environments, it is
  important to know, with confidence, …

• Download
  How to Choose a Voltage Reference &mdash LT Journal
  PDF, 282 Kb, File published: Mar 1, 2009
  Extract from the document

  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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Manufacturer's Classification

• Signal Conditioning > Voltage References > Series Voltage References
• Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) Voltage References