Other Parts Discussed in Thread: ADS1298,
Section 9.3.1.7.3.1 Augmented Leads of the datasheet says: In a typical implementation of the 12-lead ECG with eight channels, the augmented leads are calculated digitally. In certain applications, it may be required that all leads are derived in analog rather than digital.
Assume that my requirement is to have the augmented leads acquired in analog domain. If I understand the description correctly, I'd have to do the following:
- connect the limb leads as following:
- IN2N - RA (R)
- IN2P - LA (L)
- IN3N - RA (R)
- IN3P - LL (F)
- configure WCT amplifiers as following:
- WCTaA - connected to IN2N - RA (R) (011 in WCTA field of WCT1 register)
- WCTaB - connected to IN2P - LA (L) (010 in WCTB field of WCT2 register)
- WCTaC - connected to IN3P - LL (F) (100 in WCTC field of WCT2 register)
- enable the amplifiers on aVF_CH6, aVL_CH5, and aVR_CH7 and disable on aVR_CH4 (1110 in the oldest 4 bits of WCT1 register)
- connect the limb leads again to channels 5, 6, and 7 as following:
- IN5P - LA (L) - since IN5N is (R+F) / 2
- IN6P - LL (F) - since IN6N is (R+L) / 2
- IN7P - RA (R) - since IN7N is (L+F) / 2
Is this correct?
And what should I do with the IN5N, IN6N, and IN7N inputs?
Thank you in advance.
Mike