ADS1292: 50Hz interference

Roman Krylov

Part Number: ADS1292
Other Parts Discussed in Thread: AFE4490, AFE4900

Hello all!

I am testing 2 wire ECG using ADS1292 channel 2, with scheme included in post

have a problem with 50 Hz interference when the body is not grounded

I attach a screenshot of ECG signal, got from ADS1292. First part - I
measure signal from body without "body grounded". Second part of
screenshot - I touch a power socket ground with finger.

If I use 3 wire scheme with RLD connected to body i have no problem

over 7 years ago

0 Tom Hendrick over 7 years ago

TI__Guru**** 180821 points

Hi Roman!

Welcome to our e2e forum! Do you have concerns about using the RLD? Here is an app note that may help you resolve the issue:

www.ti.com/.../sbaa188.pdf

0 Roman Krylov over 7 years ago in reply to Tom Hendrick

Prodigy 50 points

In AFE4490 preliminary doc on first page there is schematic, same as i need to develop on ADS1292
I need to measure ECG on 2 wire, on ECG chest belt, without connecting RLD wire to body
So, my question is: how to calculate interface circuit from AFE4900 preliminary on ADS1292

0 Tom Hendrick over 7 years ago in reply to Roman Krylov

TI__Guru**** 180821 points

Hi Roman,

I am not familiar with the AFE4490 so further discussion on this topic will need to wait until everyone is back from the Thanksgiving Holiday break here in the US. We'll provide more feedback early next week.

0 Roman Krylov over 7 years ago in reply to Tom Hendrick

Prodigy 50 points

Sorry Tom, i was wrong about AFE4490, i mean AFE4900 preliminary

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ADS1292: 50Hz interference