Datasheet Linear Technology LT6020 — Datenblatt

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LT6020-1 LT6020-1

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  Precision Op Amp Enables Fast Multiplexing at Low Power &mdash DN536
  PDF, 314 Kb, Datei veröffentlicht: Jan 23, 2015
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  Precision Op Amp Enables Fast Multiplexing at Low Power
  Design Note 536
  Kris Lokere
  Introduction
  If you are designing a system that measures a number
  of analog voltages, but not all at the same time, you
  can reduce downstream circuitry by multiplexing the
  measurements into a single output signal, then serially
  process and digitize the original voltage levels using
  shared components. The benefit is that the number
  and size of signal chain components is a fraction of
  that required by a per-channel design. Properly implementing a multiplexing solution requires attention to
  a few details, especially if you want to quickly switch
  between channels, measure accurately and maintain
  low power consumption.
  Respond Quickly
  Multiplexing increases the frequency content of the
  combined signal, since every time the multiplexer
  switches channels, the multiplexed signal changes
  value. Even if the input signals do not change quickly,
  the multiplexed signal does, so any circuitry after the
  multiplexer must respond quickly to these transitions.
  For instance, if the output signal does not fully settle …

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  Micropower Op Amp Drives 8-Channel 18-Bit Simultaneous Sampling ADC without Compromising Accuracy or Breaking the Power Budget &mdash DN541
  PDF, 417 Kb, Datei veröffentlicht: Jun 23, 2015
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  Micropower Op Amp Drives 8-Channel 18-Bit Simultaneous
  Sampling ADC without Compromising Accuracy or Breaking
  the Power Budget
  Design Note 541
  Guy Hoover
  Introduction
  The op amps used to drive 18-bit analog-to-digital
  converters (ADCs) typically draw as much supply
  current as the ADC itself, often with a maximum offset
  spec that is well above that of the ADC. If multiple ADC
  channels are required, the power dissipation from these
  drivers quickly rises to unacceptable levels. consumption drops to 45mW (typical) by using the
  device’s NAP mode.
  The LT6020 is a dual micropower, 5V/Вµs precision
  rail-to-rail output op amp with input offset voltage of
  less than 30ВµV (maximum) that draws only 100ВµA per
  amplifier (maximum).
  The circuit of Figure 1 shows the LT6020 op amp
  configured as a noninverting buffer driving the analog
  inputs of the LTC2348-18. Maximum power dissipation
  of each op amp is only 3mW. For all eight channels
  this adds up to only 24mW, approximately half the
  ADC power consumption at 10ksps. If 18-bit precision is required (SNR, THD, VOS), but …

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• Signal Conditioning > Amplifiers > Operational Amplifiers (Op Amps) > Precision Amplifiers (Vos | Low Power Amplifiers (Is < 1mA/amp) | Low Bias Current Amplifiers (Ib < 100pA) | High Voltage Amplifiers (>12V) | Rail-to-Rail Amplifiers
• Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) Amplifiers