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ECG cable and ADS1298 only

Dimitri Chateau
Prodigy 80 points

Other Parts Discussed in Thread: ADS1298

Hello,

 

I got some questions about the aquisition of the ECG signal.

I would like to get an ECG standard (12 derivations or less), in order to make an holter prototype.

I studied how to transmit data from ADS1298 to a microcontroler. But i need your help concerning the real ecg data acquisition (on me for example, with an ECG cable or independants cables).

1) It is possible to connect electrods directly to the ADS1298 (like in your evaluation kit for example with a DB15 connector but just with the component ADS1298, or directly on the analog inputs pins) without intermediary components ? 

I think i need voltage for passiv electrods, no ? maybe just le potential from the heart...

2) In the case of a DB15 connector with ECG cable on me:

I don't really understand how you can deliver a standard ecg (12 derivations) with only 8 analog inputs, i read that we need 10 electrods so 10 analogs inputs to do it ...

Is there a converter into the cable to pass from 10 to 8 ? (i believe the 2 last derivations are calculated from the others)

 

Thank you in adavance for your help,

 

Dimitri

  • 0
    TI__Expert 3260 points

    Hello Dimitri,

    1)  You would need some protection circuitry. But, you might could start [Here].

    2) This Wikipedia link explains the derivations, quite well. Mainly, "Leads" are derived from multiple electrodes. On our EVMs, we make this 'easier' by use of differential inputs.

    And, of course, if these don't help, then let us know, and we'll see if we can answer.

    [Note: Local and international safety standards drive the level of protection needed for your specific application and/or end equipment.  To that end, it is difficult for us to provide you with specific answers regarding patient protection, protection circuitry, or connecting to patients.  More explanation is listed in the ADS1298 User's Guide, data sheet, and evaluation software - the evaluation board is to be considered as lab equipment and not intended for direct connection with a patient, patient diagnostics, or with a defibrillator]