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LTC6256 LTC6257

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  Matched Resistor Networks for Precision Amplifier Applications &mdash DN502
  PDF, 87 Kb, 档案已发布: Mar 22, 2012
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  Matched Resistor Networks for Precision Amplifier Applications
  Design Note 502
  Tyler Hutchison
  Introduction
  Some ideal op amp configurations assume that the
  feedback resistors exhibit perfect matching. In practice,
  resistor non-idealities can affect various circuit parameters such as common mode rejection ratio (CMRR),
  harmonic distortion and stability. For instance, as
  shown in Figure 1, a single-ended amplifier configured
  to level-shift a ground-referenced signal to a common
  mode of 2.5V needs a good CMRR. Assuming 34dB
  CMRR and no input signal, this 2.5V level shifter exhibits
  an output offset of 50mV, which can even overwhelm
  the LSB and offset errors of 12-bit ADCs and drivers.
  R
  VCC
  R +
  – VIN +
  – R
  2.5V
  R
  DC – + LTC6255 + DN502 F01 –
  VEE Figure 1. A Single-Ended Op Amp Used as a Level Shifter For an op amp, 34dB is a less than ideal CMRR. However, …

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

其他名称:

LTC6255HS6PBF, LTC6255HS6 PBF