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Thanks for your questions. While we are not experts in EEG, I think I can provide some guidance here:
Does this help clarify the EVM connections?
Applications Engineer | Precision ADCs
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In reply to Ryan Andrews:
Thanks for your guidance. I really appreciate your help.
Yes, the earlobe electrode is intended to be the reference electrode, I am sorry for not clarifying it before. Now I think I understand the reference electrode connection.
a. If I connect left/right frontal electrode to pin 36/32 of J6 respectively, I can connect the earlobe electrode to pin 35/31/AIN1, is that right? (jumpers the other channels and 33-34 and 29-30 are connected, and SRB1 bit not set)
b. Do you mean I can directly connect the reference electrode on pin6 of JP25 and set the SRB1 bit in MISC1 register without connecting pin 33-34 and 29-30 in J6 because those pins 34 and 30 are already connected to SRB1? How should I set those pins on JP25?
In regard of the Bias electrode, I understand it is like the Right Leg Drive circuit in ECG recording. Should I use pin 4 to connect the bias electrode out? How should I set other pins in JP25?
I am so confused by the “JP81(25) Setting” in the diagram. Thank you so much for helping out.
In reply to Xinling Geng:
I have the same doubts as you .... How you solved it? I have the following figure, but doesnt work... in the software I didnt change anything. I'm looking for Section 7....to triying
Did you find out to which pin Bias_Elec should be connected to?
In reply to Carolina Moncion:
Thank you Ryan!
Just to clarify...
If I decide to use BIASOUT as the source for BIAS_ELEC I would leave JP6 uninstalled and place a jumper on JP1 [1-2]. For the software in CONFIG3, is there something specific I need to select?
If I decide to use an external buffered mid-supply voltage, I would leave JP1 uninstalled and place a jumper on JP6 [1-2]. Then in the software for CONFIG3, I would enable the BIAS Buffer and leave BIAS Measurement open?
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