According to the MAX30001 datasheet, the current generator also features a phase offset adjustment, which delays the drive current modulator relative to the input mixer. The phase can be adjusted in 11.25° increments from 0° to 168.75° for injection frequencies up to FMST. The current generator also includes a phase offset adjustment, which delays the drive current modulator with respect to the input mixer. The phase can be adjusted in 11.25° increments from 0° to 168.75° for injection frequencies up to fMSTR If n=8, the Phase = 8*11.25deg = 90deg for the imaginary part. The MAX30009 is a little more user-friendly (i.e., outputs real & imaginary values) for BioZ. To obtain the real and imaginary values, the devices must have the Phase register adjusted. We recommend a calibration step with a resistor at the drive current frequency.