SBAS813 June 2018 ADS8688AT
PRODUCTION DATA.
Table 28 and Figure 121 summarize the performance for this design. In this example, multiple sinusoidal input signals of an amplitude at ±10 V are applied to the inputs of the ADC. The initial phase angle is the same for all signals, but the input frequency is varied from 45 Hz to 55 Hz. The phase error in the last column of Table 28 reflects the measurement accuracy of this design.
INPUT TEST CONDITION | THEORETICAL PHASE ERROR(1) | MEASURED PHASE ERROR(2) | PHASE ERROR AFTER COMPENSATION(3) |
---|---|---|---|
Phase difference
(consecutive channels) |
0.036° | 0.036145° | 0.000145° |
Phase difference
(farthest channels, channel 0 to channel 7) |
0.252° | 0.249964° | 0.002036° |
For a step-by-step design procedure, circuit schematics, bill of materials, PCB files, simulation results, and test results, see Phase Compensated 8-Channel, Multiplexed Data Acquisition System for Power Automation Reference Design. |