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Application Notes

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  Fidelity Testing for A to D Converters &mdash AN132
  PDF, 3.8 Mb, File published: Oct 1, 2011
  The ability to faithfully digitize a sine wave is a sensitive test of high resolution A to D converter fidelity. This test requires a sine wave generator with residual distortion products approaching one part-per-million. Additionally, a computer-based A to D output monitor is necessary to read and display converter output spectral components. Performing this testing at reasonable cost and complexity requires construction of its elements and performance verification prior to use.
  Extract from the document

  Application Note 132
  February 2011
  Fidelity Testing for A→D Converters
  Proving Purity
  Jim Williams and Guy Hoover
  Introduction
  The ability to faithfully digitize a sine wave is a sensitive
  test of high resolution A→D converter fidelity. This test
  requires a sine wave generator with residual distortion
  products approaching one part-per-million. Additionally,
  a computer-based A→D output monitor is necessary to
  read and display converter output spectral components.
  Performing this testing at reasonable cost and complexity
  requires construction of its elements and performance
  verification prior to use.
  Overview
  Figure 1 diagrams the system. A low distortion oscillator
  drives the A→D via an amplifier. The A→D output interface
  formats converter output and communicates with the
  computer which executes the spectral analysis software
  and displays the resulting data.
  Oscillator Circuitry
  The oscillator is the system’s most difficult circuit design …

Design Notes

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  Driving a Low Noise, Low Distortion 18-Bit, 1.6Msps ADC &mdash DN494
  PDF, 1.1 Mb, File published: Aug 1, 2011
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  Driving a Low Noise, Low Distortion 18-Bit, 1.6Msps ADC
  Design Note 494
  Guy Hoover
  Introduction
  The LTC В®2379-18 is an 18-bit, 1.6Msps SAR ADC with
  an extremely high SNR of 101dB and THD of –120dB. It
  also features a unique digital-gain compression function,
  which eliminates the need for a negative supply in the
  ADC driver circuit. the LTВ®6203 and minimizes disturbances reflected into
  the LT6203 from sampling transients. The 32k point FFT
  in Figure 2 shows the performance of the LTC2379-18 in
  the circuit of Figure 1.
  Single Supply Driver
  The circuit of Figure 3 uses the digital gain compression
  feature of the LTC2379-18, which defines the ADC full-scale
  input swing to be 10% to 90% of the reference voltage.
  This means that for a 5V reference the full-scale swing is Designing a driver circuit to get the best possible performance from the LTC2379-18 is not difficult. The two
  circuits presented here demonstrate differential and
  single-ended solutions using dual and single supplies.
  Note that the components used here have been carefully
  chosen with the ADC’s accuracy and acquisition time
  requirements in mind, so any modifications should be
  thoroughly tested. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of …

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Manufacturer's Classification

• Signal Conditioning > Amplifiers > Differential Amplifiers > Single-Ended To Differential Amplifiers
• Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) Amplifiers