AD8194

Rev. 0 | Page 10 of 16

SWITCHING MODE

The source selector pin, S_SEL, is used to select which of the

two input groups is routed to the output. Source A is selected

when S_SEL is pulled up to logic high, and Source B is selected

when S_SEL is pulled down to logic low. Logic levels for this pin

are set in accordance with the specifications listed in Table 5. The

AD8194 can be used as a single-link TMDS buffer by setting

S_SEL to one fixed logic value.

S_SEL also controls the switch status of the input termination

resistors. The termination resistors for the selected input are

always connected, whereas the termination resistors for the

unselected input are always switched out (high-Z inputs).

Table 5. S_SEL Description

S_SEL

Selected

Input

Input Termination Status

0

Input B

Input B terminations enabled, Input A

terminations disabled

1

Input A

Input A terminations enabled, Input B

terminations disabled