SLAU443 Datasheet, PDF (43/68 Pages) Texas Instruments – EEG Front-End Performance Demonstration Kit

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8 Test Options on the EVM
Test Options on the EVM
8.1 On Chip (ADS1299) Input Short
The channel input can be shorted internally by setting the input multiplexer of the individual channel to
001. The global registers must be set as shown in Figure 51. The channel control registers must be set as
shown in Figure 50. This test gives the noise in the channel. It also gives the offset in the channel. The
result can be seen in the analysis tab. Figure 52 shows a snapshot of the scope for internal input short
with gain setting of 24. The channel offset in this example is 23uV and noise is less than 1µVpp. 5000pts
at 500sps is taken there by giving data for 10 seconds.
Figure 50. Channel Setting for Input Short Test
Figure 51. Global Register Settings for Input Short Test
SLAU443 – May 2012
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