Datasheet Linear Technology LT1991IMS#TRPBF

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Design Notes

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  Precise Gain Without External Resistors &mdash DN348
  PDF, 79 Kb, File published: Sep 5, 2004
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  Precise Gain Without External Resistors – Design Note 348
  Glen Brisebois
  Introduction
  Inventory and manufacturing have associated costs
  and logistical headaches. “If only we could simplify our
  stock room and our manufacturing kits.” The LT®1991
  provides so many functions that it may be the last
  amplifier you ever have to stock. This is not a limiteduse single-application difference or instrumentation
  amplifier. This is a flexible part that can be configured
  into inverting, noninverting, difference amplifiers, and
  even buffered attenuators, just by strapping its pins. It
  provides you with internal precisely matched resistors
  and feedback capacitors, so you can easily configure it
  into hundreds of different gain circuits without external
  components.
  The LT1991 offers the simplicity of using just one
  amplifier for unlimited applications—simply hook it up
  for type and gain and move on. The precisely matched
  internal resistors, op amp, and feedback capacitor
  simplify design, reduce external complexity and test
  time, lower pick and place costs, and make for easy
  probing. All of this in a small MSOP package.
  The Resistors: 0.04% Worst Case …

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  12-bit DAC in TSOT-23 Includes Bidirectional REF Pin for Connection to Op Amp or External High Precision Reference &mdash DN448
  PDF, 87 Kb, File published: Aug 25, 2008
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  12-bit DAC in TSOT-23 Includes Bidirectional REF Pin for
  Connection to Op Amp or External High Precision Reference
  Design Note 448
  Kevin Wrenner, Troy Seman and Mark Thoren
  Introduction
  The LTC®2630’s combination of a 12-bit DAC and low-drift
  integrated reference in a tiny SC-70 package has proven
  popular for a wide variety of applications. Two new DACs,
  the LTC2631 and LTC2640, take this winning formula and
  further expand its reach by adding a bidirectional REF pin
  and an optional I2C interface in a tiny TSOT-23. The LT1991 precision op amp is a superb choice for
  amplifying or attenuating the DAC output to achieve a
  desired output range because it requires no precision
  external resistors. Its integrated, precision resistors are
  matched to 0.04%, allowing gain to be set by simple pin
  strapping (see the data sheet for a large variety of gain
  options). Figure 1 shows the configuration for a difference
  gain of 4, resulting in a В±5V output with 12-bit programmability under I2C control. Integral nonlinearity, seen in
  Figure 2, is better than 1LSB. Like their predecessor, these parts feature 1-bit INL and
  DNL, offer excellent load regulation driving up to 10mA
  loads, and can operate rail-to-rail. See Table 1 for a list
  of options. Figure 3 shows a negative output system using a similar
  setup, this time with the LT1991 conп¬Ѓgured as an inverting …

Articles

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  Versatile Op Amps Need No Resistors &mdash LT Journal
  PDF, 339 Kb, File published: Mar 25, 2005
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  LINEAR TECHNOLOGY NOVEMBER 2004 IN THIS ISSUE…
  COVER ARTICLE
  Versatile Op Amps
  Need No Resistors .1 VOLUME XIV NUMBER 4 Versatile Op Amps
  Need No Resistors
  by Glen Brisebois and Jon Munson Glen Brisebois and Jon Munson Issue Highlights . 2
  LTC in the News… . 2
  DESIGN FEATURES
  30V, Dual Output Regulator
  Controller is Efficient, Rich in
  Features, and Saves Space . 5
  Teo Yang Long and Theo Phillips Dual Switcher with Spread
  Spectrum Reduces EMI . 9
  Jason Leonard Superfast Fixed-Gain
  Triple Amplifiers Simplify
  Hi-Res Video Designs . 12
  Jon Munson Power Supply Tracking for
  Linear Regulators . 14
  Dan Eddleman Tiny, Resistor-Programmable,
  ВµPower 0.4V to 18V Voltage
  Reference. 16
  Dan Serbanescu and Jon Munson Hot Swap for
  High Availability Systems . 18 …

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Manufacturer's Classification

• Signal Conditioning > Amplifiers > Operational Amplifiers (Op Amps) > Precision Amplifiers (Vos | Low Power Amplifiers (Is < 1mA/amp) | High Voltage Amplifiers (>12V) | Rail-to-Rail Amplifiers
• Signal Conditioning > Amplifiers > Difference Amplifiers
• Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) Amplifiers

Other Names:

LT1991IMSTRPBF, LT1991IMS TRPBF