I am already using the AD627 that I find fantastic for example strain gauge measurement.
Now, my problem is to measure a current through a shunt of max 70 mV.
It is a PWM signal, thus, the information is a pulse where frequency is stable but the modulation is not.
Therefore my output is also a pulse, what I can not use because I need a DC information, not a PWM one.
So, is there a special schematic / add/ filtering / else that I have forgotten ?
In summary, I have a shunt before the load that works in PWM mode. I want to measure the current and get a DC voltage. Possible with the AD 627 ?
Thanks for your help
Sounds like all you'd need to do is to use a low pass filter (LPF, simple RC) on the signal in order to derive a DC voltage that's proportional to the PWM duty cycle and you'd have what you need
Because of AD627's high input impedance, you may be able to configure your LPF right onto the input of the AD627 after the shunt. You can use the AD627 Spice model to make a pretty good prediction of the circuit behavior.