Q&A Is there any possibility that AD conversion value of AD7731 to vary by several tens of μV when capacitance of the AVDD bypass capacitor?

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AD7731 Production
The AD7731 is a complete analog front-end for process control applications. The device has a proprietary programmable gain front end that allows it to...
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AD7731 on Analog.com

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Is there any possibility that AD conversion value of AD7731 to vary by several tens of μV when capacitance of the AVDD bypass capacitor?

miky on Sep 26, 2024

Category: Datasheet/Specs

Product Number: AD7731

Hello.

I have question about AD7731.

Is there any possibility that AD conversion value of AD7731 to vary by several tens of μV when capacitance of the AVDD bypass capacitor?

When I changed the AVDD bypass capacitor and the temperature was varied from about 25°C to 50°C, the AD conversion value of the AD7731 changed by several tens of μV.

Best regards

Datasheet/Specs Multiplexed A/D Converters ad7731 Precision A/D Converters

Yugel

on Sep 26, 2024 3:54 AM
0
Hello miky ,

We have to isolate the issue first in a way that it isn't the temperature change that caused the shift in conversion. Anyway, mismatched, high tolerance capacitors in the analog front end (not supply) can exacerbate the issue with the temperature change. Supply bypass capacitor should not have that much effect.

Regards,

Yugel
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