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Design Notes

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  LT1880 SOT-23 Superbeta Op Amp Saves Board Space in Precision Applications &mdash DN266
  PDF, 75 Kb, File published: Sep 1, 2001
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  SOT-23 Superbeta Op Amp Saves Board Space
  in Precision Applications – Design Note 266
  Glen Brisebois
  INTRODUCTION
  The tiny new LTВ®1880 achieves precision unprecedented
  in a SOT-23 package without resorting to autozeroing
  techniques. Input offset voltage and drift are typically
  40ОјV and 0.3ОјV/В°C, respectively, with guarantees of
  200ОјV and 1.2ОјV/В°C maximum over temperature. The
  device operates on total supplies from 2.7V to 40V with
  rail-to-rail outputs, giving a dynamic range of 120dB.
  Unlike some competitors’ SOT-23 op amps, which claim
  to maintain good precision, the LT1880 supports its
  input precision with a high open loop gain of 1.6 million, as well as 135dB CMRR and PSRR. It is available
  in commercial and industrial temperature grades.
  APPLICATIONS
  Getting Rail-to-Rail Operation without
  Rail-to-Rail Inputs
  The LT1880 does not have rail-to-rail inputs, but for
  most inverting applications and noninverting gain
  applications, this is largely inconsequential. Figure 1
  shows the basic op amp configurations, what happens
  to the op amp inputs, and whether or not the op amp …

Articles

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  LT1880 SOT-23 Op Amp Saves Board Space in Precision Applications &mdash LT Journal
  PDF, 139 Kb, File published: May 1, 2001
  Extract from the document

  DESIGN FEATURES LT1880 SOT-23 Op Amp Saves
  Board Space in Precision Applications
  by Glen Brisebois Introduction
  The tiny new LT1880 achieves precision unprecedented in a SOT-23
  package without resorting to autozeroing techniques. Input offset
  voltage and drift are typically 40ВµV
  and 0.3ВµV/В°C, respectively, with
  guarantees of 200ВµV and 1.2ВµV/В°C
  maximum over temperature. The
  device operates on total supplies from
  2.7V to 40V with rail-to-rail outputs,
  giving a dynamic range of 120dB.
  Unlike some competitors’ SOT-23 op
  amps, which claim to maintain good
  precision, the LT1880 supports its
  input precision with a high open loop
  gain of 1.6 million, as well as 135dB
  CMRR and PSRR. It is available in
  commercial and industrial temperature grades. The circuit of Figure 2 shows an
  extreme example of the inverting case.
  The input voltage at the 1M resistor
  can swing В±13.5V and the LT1880
  will output an inverted, divided-byten version of the input voltage. The …

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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