HI Sir
I use the AMC1300 for current monitor,shunt is 0.01 ohm
I can see the amc1300 output 0.02A when no current flow
below figure is my circuit,do you have any suggestion for filter design before the AMC1300?
Thanks
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HI Sir
I use the AMC1300 for current monitor,shunt is 0.01 ohm
I can see the amc1300 output 0.02A when no current flow
below figure is my circuit,do you have any suggestion for filter design before the AMC1300?
Thanks
Hi Alex,
Can you tell us at what point in your schematic you are measuring? Are you measuring the differential output of the AMC1300 directly or are you measuring at the output of your amplifier circuit? Also, are you seeing 20 mV at the output of the AMC1300 or a voltage that would be equal to 20 mA flowing through your 10m Ohm shunt?
HI Tom
You can reference below figure
Short the input of AMC1300 ,MCU is reading 0.03A,
Short the output of AMC1300 ,MCU is reading 0.02A,
Do you have any sugesstion to design a filter before the AMC1300?
HI Michael
The U86 is an INA ,
The circuit work is correct, but have a noise issue in the shunt,
i need a filter to remove the noise issue,thanks
Hi Alex,
So the difference between shorting the input versus shorting the outputs is 0.01mA, this sounds more like an offset issue to me and I don't know that a filter on the input of the AMC1300 is going to resolve the problem. Is there any ripple content to the signal? If so, can you let us know the frequency?
Hi Alex -
Not sure what to tell you here without seeing some of the waveforms you might be looking at. Is this a purely DC application? You could put a 1KHz LPF filter on the input, but I'm not sure that's going to resolve your problem. Normally, one of the inputs (either IN-P or IN-N) are referenced back to GND1. You show differential and common-mode caps in the schematic above - are there any series resistors already present between these caps and the shunt?