Inside the 1902
55
The EEG daughterboard, designated the CED1902-04, provides
medical isolation designed to meet EN60601-1 isolation
standards. There are several design options for this card that are
implemented at board assembly. Some options are mutually
exclusive, so the board is never fully populated.
Build options include the buffer (see page 35), isolated
transducer power and the input clamp (see page 41).
This board is optimized for low noise and a high common-
mode rejection ratio (CMRR), which makes it ideal for EEG
recording. Using the standard model of daughterboard, overall
1902 voltage gain is software-selectable between ×1,000 and
×1,000,000, or between ×100 and ×100,000, these build options
being at the user’s choice.
CED1902-04 C – the EEG daughterboard
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