Tool/software:
Dears,
I am working with my ADS1291 (not EVK, 1CH ECG) and getting trouble in DC Lead-off problem.
My board uses DC-lead off with 10M-Ohm pull-up/pull-down resistors. (RLD not used, dc blocking capacitors not used)
The DC Lead-off gives good results under normal conditions.
However, sometimes both leads are detected as attached in short times even when both leads are disconnected definitely.
I am struggling with this problem for several weeks but I cannot find the reason.
And the problem is not reproduced normally but about 10% sample board (out of 100 samples) give the phenomenon randomly.
I have been searching the cause from some electro-static effect, or ground problem and so on, but I cannot find the cause of this problem.
Please give me some advice or comments for this problem.
Here is my related schematic.
