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39 Engineering a More Sustainable Future | ADI Table 3: Magnetic Encoder (AMR) Signal Chain Recommended Components Component Recommended Part Numbers MEMS Accelerometer ADXL371, ADXL372, ADXL314, ADXL375 Temperature Sensor ADT7320 Power (LDO Regulator) ADP320, LT3023, LT3029 ADC, 12-Bit, 16-Bit SAR MAX11198, AD7380, AD7866 AMR Magnetic Sensor ADA4570, ADA4571, AD4571-2 Dual Comparator LTC6702 Transceiver (RS-485, RS-422) MAX22506E, ADM3066E, ADM4168E, MAX22500E Microcontroller, Integrated ADC MAX32672, MAX32662 Magnetic Encoder (Hall) A Hall encoder can be designed using the AD22151 or the AD22151G. The AD22151G is a linear magnetic field transducer. The sensor output is a voltage proportional to a magnetic field applied perpendicularly to the package top surface. To design the encoder system, equally spaced magnets are placed on a rotating motor shaft. As the rotating shaft magnets pass the Hall sensors, the voltage output from the sensor peaks. Using more magnets or sensors produces more resolution. The Hall effect encoder can use the MAX32672 and ADM3066E for the wired interface. The ADXL371 MEMS and ADT7320 offer condition monitoring for harsh encoder environments. The Magnetic Encoder (AMR) section provides more information on these signal chain components. Table 4: Magnetic Encoder ( Hall ) Signal Chain Recommended Components Component Recommended Part Numbers MEMS Accelerometer ADXL371, ADXL372, ADXL314, ADXL375 Temperature Sensor ADT7320 Power (LDO Regulator) ADP120, ADP220, ADP320, LT3023, LT3029, LT3024, LT3027 Transceiver (RS-485/RS-422) MAX22506E, ADM3066E, ADM4168E, MAX22500E Hall Sensor AD22151, AD22151G Microcontroller, Integrated ADC MAX32672, MAX32662 Adobe Stock / IM Imagery – stock.adobe.com Adobe Stock / Andrey Armyagov – stock.adobe.com