How susceptible is the ACS758 to stray magnetic fields?
The ACS758 contains a concentrator core that acts not only as a concentrator of the flux lines generated by IP, but also as a shield to protect the Hall circuit IC from ambient common-mode fields (typical rejection of common mode fields is –41 dB). The results are detailed in figure 7, which compares the output voltages, VOUT, of an unshielded linear Hall-effect sensor IC and that of the ACS758. The devices have the same gain, and are exposed to the same magnetic field, applied in an air core through the top of the package.
