Low pass filter ic? possibly a suggestion on what's to do better

shurp

on Jan 12, 2022

Hey, I have a current sensor that output 4mA to 20mA. I plan on using a resistor value of 226ohm which gives me 0.9V to 4.5V. I was planning on measuring the voltage with analog input of the microcontroller but I would like to use a low pass filter before measuring the voltage.

Low pass filter is important as well as low drift. Can you please recommend me one. In addition, would you add anything to this circuitry to make it even better/ safer.

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[edited by: shurp at 7:07 PM (GMT -5) on 12 Jan 2022]

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0 gdsalas

on Jan 13, 2022 6:53 PM
Hi,

We'll contact the apps engineer specializing in filters and get back to you. May I know in what application will you use this? All the best!
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0 shurp
on Jan 13, 2022 10:47 PM in reply to gdsalas
I have three inverters that I want to measure the power consumption of; it's in a noisy environment. I will be using a microcontroller that measures voltage across 226ohm. Before measuring the voltage, I would like to remove any AC noise on the voltage signal.
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0 gdsalas

on Jan 18, 2022 1:42 AM in reply to shurp
Hi Shurp,

There are a couple of low pass filters that ADI supports. Frequency is one of the considerations in selecting a filter. Would you know the frequency of operation?
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0 shurp
on Jan 18, 2022 7:26 PM in reply to gdsalas
Hey, I will be measuring a DC signal; therefore, low pass filter with a cutoff frequency of 20Hz, or anywhere near to DC signal would be nice. I will be using a single supply 5V, and the input voltage would be between 0.5V to 4.8V. I will constantly be measuring the DC signal coming from the current sensor. So, a small time constant filter is needed.
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0 shurp
on Jan 18, 2022 7:26 PM in reply to gdsalas
Hey, I will be measuring a DC signal; therefore, low pass filter with a cutoff frequency of 20Hz, or anywhere near to DC signal would be nice. I will be using a single supply 5V, and the input voltage would be between 0.5V to 4.8V. I will constantly be measuring the DC signal coming from the current sensor. So, a small time constant filter is needed.
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+1 ADIApproved

on Jan 21, 2022 2:26 PM in reply to shurp
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0 shurp
on Jan 21, 2022 3:13 PM in reply to ADIApproved
I have already bought LTC1063, and I will be using LTC1063 instead of LTC1062. I will test it and see where it goes. Thank you
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Low pass filter ic? possibly a suggestion on what's to do better