Electrical noise is an unavoidable source of measurement error. The differential output of TMAG6180-Q1 and TMAG6181-Q1 help improve SNR. Understanding the impact on angle accuracy is important when considering SNR. Figure 3-9 shows how varying amounts of RMS output noise impacts the quality of an angle calculation. The error shown on each series assumes the maximum positive differential noise value, on the cosine output, with a maximum negative differential noise value, on the sine output. The resulting worst case angle error from noise is shown in Figure 3-9. The effective angle error remains fairly negligible in the case of an output referred noise of 0.5 mV RMS. However, an output filter, or oversampling, can be implemented to reduce noise further if desired.

Figure 3-9 Angle Error Due to Worst-Case Peak to Peak Noise