SBAS502C December 2011 – April 2020 ADS1291 , ADS1292 , ADS1292R
The input multiplexer has ECG-specific functions for the right leg drive signal. The RLD signal is available at the RLDOUT pin once the appropriate channels are selected for RLD derivation, feedback elements are installed external to the chip, and the loop is closed. This signal can be fed after filtering or fed directly into the RLDIN pin, as shown in Figure 35. This RLDIN signal can be multiplexed into any one of the input electrodes by setting the MUX bits of the appropriate channel set registers to '0110' for P-side or '0111' for N-side. Figure 35 shows the RLD signal generated from channel 1 and routed to the N-side of channel 2. This feature can be used to dynamically change the electrode that is used as the reference signal to drive the patient body. Note that the corresponding channel cannot be used and can be powered down.