6462011 datasheet(39/68 Pages) TI1

tên linh kiện	6462011

Giải thích chi tiết về linh kiện	EEG Front-End Performance Demonstration Kit

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EEG Specific Features

Figure 45. FFT Analysis for Impedance Measurement at 31.25Hz

Out of band Lead off detection

ADS1299 also provides option to do electrode impedance measurement at frequencies outside the EEG

bandwidth of interest. The frequency for this AC current source is set at f

DR/4. For example to do an AC

lead-off detection at 1 kHz the data rate for the device must be set at 4Ksps. These measurements can be

done concurrently with the EEG measurement. Figure 46 shows the fft result of AC lead off detection at

fDR/4 with data rate of 4Ksps. The impedance component is present at 1KHz and must be bandpass

filtered. The EEG information is at low frequencies and the data must be low pass filtered to extract the

information. It is recommended to use only nA range current sources for concurrent measurement of EEG

and impedance. For µA range the noise from the current source will be too large and it may swamp the

EEG signal.

SLAU443 – May 2012

EEG Front-End Performance Demonstration Kit

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