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Question asked by CharlieA on Feb 24, 2012
Latest reply on Feb 24, 2012 by CharlieA

Figure 44 of the AD8235 Data sheet shows the device paired with AD8609 in a hi-pass configuration with break at 0.3 Hz.  The AD8609 has very high voltage noise at this frequency.  Fundamental of Heart Beat is about 1 Hz with content to about 60 Hz.


As I am in the task of designing a mobile low power, single cell (Li-Ion), and hopefully very quiet EEG and EKG device, can anyone tell me why the AD8609 was selected rather than a very quiet amp like the AD4528?