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ADS1191 - Wrong data output

Jakub Kraus
Prodigy 10 points
Other Parts Discussed in Thread: ADS1191

Hi!

I have serious problem with my ADS1191. My ADS is completely programmed and able to data retrieving, but it receives data from ADS, which include some kind of distortion.

Test signals are OK, but when I send to input of ADS signal from Fluke signal generator sinusoidal or ECG signal, in the retrieved signal is unwanted distortion (like below images shows). It looks like oscillation of received data.

Registers are set: CONFIG2 - 0xA0; CONFIG1 - 0x02; CH1SET - 0x00; CH2SET - 0x80.

Note: IN2P and IN2N are not connected.

Test signal:

http://2i.sk/5f67c1eb38

Sinusoidal signal:

http://2i.sk/4e76d0fa29

Sinusoidal signal - detail:

http://2i.sk/7d45e3c91a

I really dont know, where in SW or HW is a mistake.

Do somebody recognise this type of problem? 

Thank you very much for your time.

Best regards,

                                 Jakub Kraus