Part Number:ADS1299
Hello TI engineers! I have recently encountered several technical problems with TI's chips. TI's evaluation board is to directly acquire EEG signals without an external amplifier circuit, but the EEG signal is a very weak signal, and the voltage amplitude is only uV level. The PGA of the chip has a maximum gain of 24, and if the EEG signal is 20uV, the amplitude after amplification is 20*24=480uV, so the voltage captured by the ADC is less than 1mV. My question is: Can EEG signals be captured without an external amplifier circuit? Is an external amplifier circuit necessary? Do you have any suggestions? thank you very much!