Datasheet

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