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Notas de Diseño

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  Low Power, Precision Op Amp Simplifies Driving of MUXed ADCs &mdash DN1034
  PDF, 371 Kb, Archivo publicado: oct 1, 2015
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  Low Power, Precision Op Amp Simplifies
  Driving of MUXed ADCs
  Design Note 1034
  Guy Hoover
  Introduction
  The high speed op amps required to buffer a modern
  16‑/18-bit analog-to-digital converter (ADC) typically
  dissipate as much power as the ADC itself, often with
  a maximum offset spec of aboutВ 1mV, well beyond
  that of the ADC. If multiple multichannel ADCs are
  required, the power dissipation can quickly rise to
  unacceptable levels.
  The simple buffer presented here is capable of driving
  the LTC В®2372-18 8-channel ADC and achieving near
  data sheet SNR, THD and offset performance with very
  low power dissipation if the input signals involved are
  in the range of DC to 1kHz.
  Circuit Description
  The LTC2372-18 is a low noise, 500ksps, 8-channel
  18‑bit successive approximation register (SAR)ADC.
  Operating from a single 5V supply, the LTC2372‑18
  achieves –110dB THD (typical), 100dB (fully
  differential)/95dB (pseudo-differential) SNR (typical) …

Artículos

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  Low Power, Precision Op Amp Simplifies Driving of MUXed ADCs &mdash LT Journal
  PDF, 313 Kb, Archivo publicado: agosto 11, 2016
  Extracto del documento

  Low Power, Precision Op Amp Simplifies Driving of MUXed
  ADCs
  Guy Hoover The high speed op amps required to buffer a modern 16‑/18-bit analog-to-digital
  converter (ADC) typically dissipate as much power as the ADC itself, often with a
  maximum offset spec of aboutВ 1mV, well beyond that of the ADC. If multiple multichannel
  ADCs are required, the power dissipation can quickly rise to unacceptable levels.
  8V
  0.1ВµF 4.096V 5V
  1.8V TO 5V 0V 10ВµF 4.096V 91О© + 0V 4300pF The LT6016 is a dual rail-to-rail input op
  amp with input offset voltage less than
  50ВµV (maximum) that draws only 315Вµ A
  per amplifier (typical). It is also available
  as a single and a quad (LT6015/LT6017).
  The circuit of Figure 1 shows the LT6016
  op amp configured as a noninverting
  buffer driving the analog inputs of the
  LTC2372-18. Typical power dissipation
  of each op amp is only 3.7mW. For all
  eight channels, this is a power dissipation of only 30mW, approximately the
  same power dissipation as the ADC.
  Running the LT6016 on a single 5.25V
  supply and enabling the ADC’s digital
  gain compression mode reduces the …

Linea modelo

Clasificación del fabricante

• Data Conversion > Analog-to-Digital Converters (ADC) > Precision ADCs (Fs < 10Msps) > Multi Channel ADCs
• Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) ADCs

Otros nombres:

LTC2372IUH-18PBF, LTC2372IUH-18 PBF, LTC2372IUH18#PBF, LTC2372IUH 18#PBF