Datasheet Linear Technology LT1677

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Design Notes

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  Rail-to-Rail Amplifiers Operate on 2.7V with 20ВµV Offset &mdash DN230
  PDF, 75 Kb, File published: Apr 15, 2001
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  Rail-to-Rail Amplfiiers Operate on 2.7V with 20ВµV Offset
  Design Note 230
  Glen Brisebois
  The LTВ®1677 and LT1884 are the latest results of Linear
  Technology’s quest for the “ideal” Op Amp1. Both of
  them will operate with supplies down to 2.7V, have
  only 20ОјV of input offset voltage and have rail-to-rail
  outputs. The LT1677 features very low noise, 3.2nV/в€љHz;
  the LT1884 features very low 150pA input bias current.
  Each of the two application circuits shown below take
  advantage of some particular subset of the features of
  these amplifiers. To complicate matters, Geophones are often buried in
  order to avoid interference from traffic and other surface
  effects and so are often necessarily remote.
  The circuit in Figure 1 applies a gain of ~100 to the
  Geophone signal and transmits this back to the operator
  by modulating its own supply current. U2 is an LT1635
  configured as a stable current source of 5mA. This
  then powers the LT1677 as well as another LT1635,
  this time configured as a 3V shunt regulator. Resistors
  R6 and R7 set up a DC bias voltage of 1.85V, centering
  the output swing offset by Q3 and keeping the LT1677 Remote 2-Wire Geophone Preamp
  Using the Low Noise LT1677 …

Articles

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  New Rail-to-Rail Output Op Amps Bring Precision Performance to Low Voltage Systems &mdash LT Journal
  PDF, 370 Kb, File published: May 1, 2000
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  DESIGN FEATURES New Rail-to-Rail Output Op Amps
  Bring Precision Performance to
  Low Voltage Systems
  by Alexander Strong
  and Gary Maulding Introduction
  Linear Technology has recently
  released several new high precision
  op amps for use in low voltage systems. The LT1677, LT1881, LT1882,
  LT1884 and LT1885 all operate on
  power supplies from 3V or lower up to
  36V and have rail-to-rail output voltage swing. These amplifiers allow high
  precision circuits to be implemented
  on low voltage power supplies,
  including single positive supplies.
  Rail-to-rail output stages maintain
  the output signal dynamic range by
  eliminating the base-emitter voltage
  drops of conventional emitter-follower
  output stages. Offset voltages are trimmed to less than 80ВµV, with the low
  temperature drift and low noise to be
  expected from bipolar transistor
  designs. High open-loop voltage gains
  maintain this accuracy over the output swing range. …

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Manufacturer's Classification

• Signal Conditioning > Amplifiers > Operational Amplifiers (Op Amps) > Precision Amplifiers (Vos | Low Noise Amplifiers ( | High Voltage Amplifiers (>12V) | Rail-to-Rail Amplifiers