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ADAS1000-4 and ADAS1000-2 configuration for 12 leads

I am designing a 12 leads ECG by using ADAS1000-4 and ADAS1000-2. However I can not see the correct configuration of getting 12 leads (aVR, aVL, aVF, L1, L2, L3, V1, V2, V3, V4, V5, V6).

I know that is possible to get aVR, aVL, aVF, L1, L2 and L3 with ADAS1000-4, and also possible to get V1, V2, V3, V4 and V5 with ADAS1000-2. However there is one channel that is needed V6 in order to cover 12 leads and is not possible get this from available used ICs. 

How can configure/organize these ICs in order to achieve my design.

PD: Datasheet of ADAS1000-2 in page 49 indicates that is possible get 12 leads with both of these ICs.

  • Hello Jefferson,

    Thanks for your email.

    The ADAS1000-4 has 3 ECG channels.

    The ADAS1000-2 companion has 5 ECG channels.

    From this you have 8 ECG inputs.

    Normally for a 12lead configuration, 9 ECG input channels are used, this is more straightforward.

    However, it is possible to realize a 12-lead configuration using 8 ECG channels by doing the following:

    • ADAS1000-4 (use in common electrode mode with RA applied to the CM_IN and common mode buffer providing this to the other electrodes and to the slave device.
      •  Apply RA to the Common electrode input
      • Provide RA from common mode amplifier to the ADAS1000-2 device
      • Apply LA, LL, V1 to the 3 ECG inputs
        • Channel 1 = LA-RA (LEAD I)
        • Channel 2 = LL-RA (LEAD II)
        • Channel 3 = V1-RA
    • ADAS1000-2
      • Apply V2-V6 to the 5 ECG inputs and with the RA from the Master device applied to CM_IN of this device
      • Use in electrode mode, ECG channels give you V2-RA, V3-RA etc
    • Host must derive LEAD III, aVF, aVL, aVR and the Vx leads wrt WCT
      • LEAD II - LEAD I),
      • aVR=-(LEAD I+LEAD II)/2
      • aVL=(LEAD I- LEAD III)/2
      • aVF=(LEAD II +LEAD III)/2
      • Calculate WCT from the LEAD I/II/II to get V2 - WCT

    Alternatively if an 8channel configuration with leads derived like this is not suited, then I  would advise choosing the ADAS1000 5-Ch ECG, there you would have 10 ECG channels with give you 9 ECG inputs and 1 spare channel.

    Hope this helps!


  • Thank you so much... I just need to clarify one more thing, how can achieve this "Calculate WCT from the LEAD I/II/II to get V2 - WCT"

    I can not find a mathematics equation to get WCT from Limb leads. Can you help with this last doubt?

    Thanks in advanced.

  • Yes, that's it!

    Vx-WCT = Vx-RA - (LI+L2)/3

    best regards,


  • I think I solved. 

    I have Vx - Ra and I need Vx - WCT or Vx - (RA + LA + LL)/3 so...

    Vx - (RA + LA + LL)/3 + (RA - RA)

    Vx - RA - (RA + LA + LL)/3 + RA

    Vx - RA + (3*RA - RA - LA - LL)/3

    Vx - RA + (2*RA - LA - LL)/3

    Vx - RA + (- (LA - RA) - (LL - RA))/3


    (Vx - RA) - (L1 + L2)/3 which is equal to Vx - WCT


  • Dear Catherine, 

    Can we test this configuration on the ADAS1000 EVM. If yes, Please let me know the settings to be done.