Hello everyone, I am currently working on a fully isolated motor driver using an STM32G474RE. I need to interface the AMC1301differential output to the MCU in a way that ensures accurate measurements. What is the best approach to achieve this? Also in mc workbench app, MCU opamp -> ADC hardware variant for Current sense -> InternalOpamps -> Differential -> InternalPGA. Or I will make the diff to single like in other picture wich looks easier. Also looks same with design below.
G474re has ADC capable to run differential mode, so take example Fig.8-1. Power Vdd2 by 3.3V from st side to stay safe. I see amp has BW ~200 kHz, so if you are not designing low power kind of app., than run ADC at full scale, for 12- bits about 2.8 Msps and also set OVS - oversampling. Again, depends on required BW OVS may vary from 8- to max 256, and provide up to 16-bits resolution for free
if I use amc1301 and diff mod of MCU , then what I will choose these numbers. for example
Polarization offset -> 1.44? because 0 current mean amc1301 produce 1.44 V for each out, PGA = 0. what about offset network attenuation?. Or I will choose to convert to diff to single line and direct to MCU . I already know about that. But diff mode advantage is two line can travel more in PCB without problem
