Datasheet Linear Technology LTC2508-32 — Даташит

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Design Notes

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  Reference Filter Increases 32-Bit ADC SNR by 6dB &mdash DN568
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  Reference Filter Increases 32-Bit ADC SNR by 6dB
  Design Note 568
  Guy Hoover
  Introduction
  Attaining optimal SNR performance from an ADC isn’t
  just a matter of providing a low noise signal to the ADC’s
  input. Providing a low noise reference voltage is just
  as important. While reference noise has no effect at
  zero-scale, at full-scale any noise on the reference will
  be visible in the output code. This is why dynamic range
  (DR) which is measured at zero-scale is usually several
  dB better for a given ADC than the signal-to-noise ratio
  (SNR) which is measured at or near full-scale. Providing
  a low noise reference voltage is particularly important
  in an oversampling application where it’s possible for
  the ADC’s SNR to exceed 140dB. To achieve an SNR
  at this level, even the best low noise references need
  some help to reduce their noise levels.
  There are several alternatives that can reduce reference
  noise. Increasing the size of the bypass capacitor or
  using a simple lowpass RC filter on the reference output
  are not good alternatives. A large bypass capacitor on
  the reference output by itself cannot produce a low …

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Классификация производителя

• Data Conversion > Analog-to-Digital Converters (ADC) > Precision ADCs (Fs < 10Msps) > Single Channel ADCs