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Precision ADCs
Documents FAQ: AD7380/AD7381: What oversampling method is best for an application?
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    • FAQ: AD7380/AD7381: What are the pros and cons of a Serial 2 wire mode and serial 1 wire mode?
    • FAQ: AD7380/AD7381: What oversampling method is best for an application?
    • The AD7380 has an on chip oversampling, Why is there a need for an oversampling?
    • The AD7380(AD738x) a 16-bit resolution ADC throughput rate is at 4MSPS. When resolution boost is enable allowing 18-bit conversion result. With the additional 2-bits, does the AD7380 would still able to maintain the throughput rate at 4MSPS?
    • The conversion result of the AD738x family generics is clocked-out in the SDOA and SDOB pins. In the typical schematic, these pins have a 100ohm resistor connected going to the digital interface. Can I connect this pin directly without the resistor?
    • FAQ(AD7380): The AD7380(AD738x family) ADC has an on-chip buffered 2.5V reference. Can this internal reference be use to supply external circuitry?
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FAQ: AD7380/AD7381: What oversampling method is best for an application?

              The AD738x has two Oversampling mode, Normal Averaging Oversampling and Rolling Average Oversampling.

              Normal Averaging is best used in application where a high precision or high SNR or Dynamic range is needed and speed is not a concern, because it can average up to oversampling ratio of 32x but the tradeoff would is that it will have slower throughput rate as the oversampling ratio increases. On the other hand, the rolling average are best fit in application where both the high precision performance and throughput rate are desired. It can have a throughput rate up to 4MSPS and oversampling ratio up to 8x. Additionally in normal averaging the sampling instant of the additional samples is controlled internally by the AD7380. In rolling average the sampling instant is controlled by the user so for applications that are sensitive to the sampling instant rolling average oversampling mode would be more appropriate.

  • simultaneous sampling
  • AD7381
  • AD7380
  • Dual channel
  • oversampling
  • differential adc
  • differential input
  • sar adc
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