The following example compares an ADS131M08 channel with phase calibration enabled to one with no programmed phase calibration. Figure 3-1 shows a recreation of the DRDY signals of two ADS131M08 channels: ADS131M08(0) in red and ADS131M08(1) in black.

Figure 3-1 DRDY signals for two channels with no phase calibration applied

This $\overline{\mathrm{D}\mathrm{R}\mathrm{D}\mathrm{Y}}$ timing difference is the digital equivalent of the waveforms shown in Figure 3-2, where the load phase angle,$\mathbf{\phi }$,and the phase error, $∆\mathrm{\phi }$, are both present.

Figure 3-2 two measured signals with shift of $\mathbf{\phi }$ +$∆\mathrm{\phi }$.

The $∆\mathrm{\phi }$ is the unwanted phase error that needs to be removed by applying a phase shift to the ADS131M08 channels.

Assume the 38tMOD (9.28µs) from Equation 13 has been converted to binary and programmed into the PHASE0[9:0] register of ADS131M08(0). Figure 3-3 shows the $\overline{\mathrm{D}\mathrm{R}\mathrm{D}\mathrm{Y}}$ signals with a positive phase shift of 9.28$\mathrm{\mu }\mathrm{s}$ applied to ADS131M08(0).

Figure 3-3 DRDY signals for two channels with 9.28µs phase shift applied to channel 0

With the phase error compensated, the resulting signals are corrected. Figure 3-4 shows the two measured signals after phase compensation is applied; the $∆\mathrm{\phi }$ component is removed, leaving only the intended load phase angle $\mathbf{\phi }$.

Figure 3-4 two measured signals with shift of φ