For precision measurement in a multichannel system, coupling (such as crosstalk) from one channel to another can distort the measurement. In conventional multiplexers, as shown in Figure 32, the off channel parasitic capacitance between the drain and the source of the switch (CDSY) couples the off channel signal to the on channel.
Figure 32 shows that the ADS816x uses a T-switch structure. In this switch architecture, the off channel parasitic capacitance is connected to ground, which significantly reduces coupling. Care must be taken to avoid signal coupling on the printed circuit board (PCB), as described in the Layout section.