SBAA487 January   2021 ADS8664 , ADS8668 , ADS8674 , ADS8678 , ADS8684 , ADS8684A , ADS8686S , ADS8688 , ADS8688A , ADS8694 , ADS8698

 

  1.   Trademarks
  2. 1Introduction
  3. 2Phase Delay and Non-Simultaneous Sampling
  4. 3Averaging with Sequencer and Burst Sequencer mode
    1. 3.1 Averaging with Sequencer
    2. 3.2 Averaging with Burst Sequencer
  5. 4Verification and Measured Result
    1. 4.1 Phase Delay Measurement
      1. 4.1.1 Measured Phase Delay without Averaging – 50Hz Sinusoidal Fundamental Signal
      2. 4.1.2 Measured Phase Delay with Averaging – 50Hz sinusoidal fundamental signal
      3. 4.1.3 Comparison
    2. 4.2 AC Performance
  6. 5Summary
  7. 6References

4.1.2 Measured Phase Delay with Averaging – 50Hz sinusoidal fundamental signal

The measured phase delay between channels with sample averaging can be found in Table 4-2.

Table 4-2 Measured Phase Delay with Sample Averaging (50Hz Sinusoidal input)
Theoretical Delay ∆θ (º) Measured Phase Delay ∆θ (º)
Phase Delay Mean
Phase difference (AIN0A – AIN7A) - 0.126º 0.000127º 0.000071º
Phase difference (AIN1A – AIN7A) - 0.108º 0.000281º 0.000061º
Phase difference (AIN2A – AIN7A) - 0.090º 0.000082º 0.000085º
Phase difference (AIN3A – AIN7A) - 0.072º 0.000206º 0.000070º
Phase difference (AIN4A – AIN7A) - 0.054º 0.000246º 0.000075º
Phase difference (AIN5A – AIN7A) - 0.036º 0.000295º 0.000081º
Phase difference (AIN6A – AIN7A) - 0.018º 0.000284º 0.000069º
Reference Channel – AIN7A 0º 0º
GUID-20210106-CA0I-HJG0-ST1B-JSM2RCC8ZGF8-low.gif Figure 4-3 Phase Analysis - Phase Delay with Sample Averaging