I'm working with the EVM ADS1299EEG-FE PDK and I have identified in a test conducted something strange.
The test was performed as follows:
The parameters was sets for single-ended inputs, with the pins (5-6) JP25 shorted and with the bit SRB1 set in the MISC1.
Using a signal generator, a (FIXED) tension of 10mVpp was applied and a (VARIABLE) frequency from 10Hz to 100Hz, ranging from 10 to 10 Hz in the positive pin of the channel 1.
The result obtained in this test was that, while the frequency INCREASES, the tension that should remain fixed, DECREASED.
How can I solve this considering that frequencies around 10 to 100Hz are useful in an EEG test?
This feature is characteristic of this EVM or I need to do any special configuration to hardware or software?