Other Parts Discussed in Thread: INA240, AMC3306M25
Dear team:
I designed 2-Phase shunt current measurement circuit with two AMC1304M05 chips.
I have several question in my application.
1. what happened if AGND is not tied to AINN ?
Current sensing application in INA240, for example, Gnd and IN- pins are not tied.
if AMC1304 LDO Supply voltage only used for differential amplifier, that would be no difference between amc1304 with INA240 power supply circuit.
I read a lot of application note about isolated ADC, but I can't understand these circuits are not same.
Is there an issue with connecting VM_5V Power to LDOIN and AGND? VM_5V is regulated from DRV5350RH for other Isolator power, gate logic power supply.
(Mcu power source and DVDD, DGND Pin is not powered from VM_5V, these source is isolated from Motor power)
Left : AMC1304 Inline Current Sense Applicaiton, Right: INA240 Inline Current Sense Applicaiton
2. Can AMC3306 replace AMC1304 Applicaiton?
I can't add more isolated power components for each AMC1304 LDOIN Power because I have board size issue.
I think simplest solution is replace AMC1304M05 to AMC3306M25, and reroute pattern.
Can I apply this solution or I supposed to find another way?
Best regards