ADS1293: ADS1293 9-lead LOD application without RLD

Hi Wei,

I have discussed this with the team, and the noise issue seems to affect the V-leads that are measured with respect to the WCT signal. It is not affecting the L-I or L-II in either test condition. The noise may be coupling from the WCT signal when the AC leadoff is enable. However, the AFE_1’s V1-lead does not seem to be affected even when the AFE_1 AC leadoff is enabled. I have listed some tests below to help better understand the issue.  

1. Adding 100pF capacitor to the WCT pin to help filter the noise for the V-leads.
2. Check the V-lead signal by disabling the AFE_1 AC-leadoff and enable the AFE_2 AC-leadoff.

Wei Ken Ting said:

What the ADS1293 impedance of this path must be less the comparator threshold ?  

I'm not sure what you means by this question. Can you please help to clarify? Please also reach out to the AFEs support at ads129x-support@list.ti.com for further support for the ADS1293.

Thanks.

-TC