I'm using an ADE7880 for a university project. The current sensors are Rogowski coils, therefore I turned on the digital integrator as explained in datasheet (DICOEFF and CONFIG registers). To calibrate the device, I used a single phase calibrator and I saw that measured phase is wrong: there is an error of about 6 degrees. To find the source of error I turned off the integrator and I imposed, with calibrator, a current with -90° phase angle (to compensate Rogowski coils); I saw that in this case there aren't any phase errors. Why the digital integrator introduces these errors?