4 Design Size

As shown previously, TMUX9832 offers high channel density while maintaining the quality of performance. The size of 2 TMUX9832 combined is still half of alternative A size and almost comparable to alternative B. Besides, TMUX9832 offers a flow through pinout, which makes the process easy to route multiple units together to design higher channel count design.

Figure 4-1 TMUX9832 Pin Arrangement

Table 4-1 is an example layout for all three devices.

Table 4-1 Layout for the Three Designs

4 x TMUX9832	2 x Alternative A	2 x Alternative B

Four of the TMUX9832 ICs can be fit in almost half of the area taken by two alternative A devices.

Coming to alternative B, even if the device size is comparable to TMUX9832, because of the flow through layout, the total design size for TMUX9832 is lower. Furthermore, TMUX9832 outperforms alternative B in terms of ON resistance and the switch capacitance values.

For an easy comparison of the performance of the three designs, we can define a Figure of Merit (FOM) as:

A higher FOM implies better performance in smaller size.

Table 4-2 summarizes the total design size, packing efficiency and channel density for the three devices for 128 channel ultrasound application: