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AD5941 Recommended for New Designs
The AD5940 and AD5941 are high precision, low power analog front ends (AFEs) designed for portable applications that require high precision, electrochemical...
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Unable to record impedances accurately for frequencies above 90kHz

isaufh

on Oct 30, 2024

Category: Software

Product Number: AD5941

Hi ADI Team,

I have implemented Impedance spectroscopy in accordance with the AD5940_ECSns_EIS example.

I am receiving accurate readings upto 90kHz but if the frequency is any higher the readings are not accurate.

I have enabled High Power mode, is there anything im missing out on

Any help on this regard will be appreciated.

pImpedanceCfg->PwrMod = AFEPWR_HP;

0 isaufh
on Nov 5, 2024 1:04 AM
Hi, can a resolution be provided for this issue, id also like to add that I'm not sweeping over the frequencies, but measuring the impedance over a constant frequency

pImpedanceCfg->SweepCfg.SweepEn = bFALSE;
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0 isaufh
on Nov 5, 2024 1:04 AM
Hi, can a resolution be provided for this issue, id also like to add that I'm not sweeping over the frequencies, but measuring the impedance over a constant frequency

pImpedanceCfg->SweepCfg.SweepEn = bFALSE;
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0 Akila

on Nov 5, 2024 3:32 AM
Hi,

It may be due to ADC saturation. You may change pImpedanceCfg->HstiaRtiaSel at higher frequencies and check.

The function AD5940_GetFreqParameters() shows other parameters that can be updated with frequency to avoid saturation for the entire frequency range.
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Unable to record impedances accurately for frequencies above 90kHz