AD8191 datasheet(15/32 Pages) AD

15 / 32 page

AD8191

Rev. 0 | Page 15 of 32

the auxiliary multiplexer pins. The AMUXVCC supply does not

draw any static current; therefore, it is recommended that the

resistor network tap the 5 V supplies as close to the connectors

as possible to avoid any additional voltage drop.

This precaution does not need to be taken if the DDC

peripheral circuitry is connected to the bus downstream of

the AD8191.

PERIPHERAL

CIRCUITRY

PERIPHERAL

CIRCUITRY

+5V SOURCE C

+5V SOURCE D

PIN 18 HDMI CONNECTOR

PIN 14 DVI CONNECTOR

PIN 18 HDMI CONNECTOR

PIN 14 DVI CONNECTOR

10kΩ

10MΩ

10kΩ

|<50mA

PERIPHERAL

CIRCUITRY

PERIPHERAL

CIRCUITRY

SOURCE A +5V

SOURCE B +5V

PIN 18 HDMI CONNECTOR

PIN 14 DVI CONNECTOR

PIN 18 HDMI CONNECTOR

PIN 14 DVI CONNECTOR

10kΩ

|<50mA

AMUXVCC

AD8191

+5V INTERNAL

(IF ANY)

Figure 28. Suggested AMUXVCC Power Scheme

AUXILIARY (LOW SPEED) SWITCHING MODES

The AD8191 has three auxiliary switching modes: quad, dual,

and single. These are selected by programming the AUX_SM

bits of the auxiliary device modes register through the serial

control interface. The auxiliary switching mode is independent

of the high speed switching mode whenever the part is

controlled through the serial control interface. When the part is

controlled through the parallel control interface, however, only

quad mode is accessible and the auxiliary switching mode

cannot be independently controlled.

Quad Switching Mode

This is the default mode. In quad mode, the AD8191 behaves

like a 4:1 auxiliary link multiplexer, routing groups of four

auxiliary input signals to the four-signal output. The user can

select which group of inputs is routed to the output by program-

ming the AUX_CH bits of the auxiliary device modes register

through the serial control interface in accordance with the

switch mapping listed in Table 13. Alternately, the user can

select which group of inputs is routed to the output by setting

the PP_CH bus of the parallel control interface in accordance

with the switch mapping listed in Table 27.

Dual Switching Mode

In this mode, the AD8191 behaves as a locked dual [8:1]

auxiliary signal switch. The two 8:1 switches share the channel

select input and, therefore, switch together. The user selects

which two out of the eight possible input groups are routed to

the output by programming the AUX_CH bits of the auxiliary

device modes register in accordance with the switch mapping

listed in Table 14. This mode is only accessible through the

serial control interface.

Single Switching Mode

In this mode the AD8191 behaves as a single 16:1 TMDS

channel multiplexer; a single channel, out of a possible 16, is

routed to all of the outputs. The user selects which input

channel is routed to the outputs by programming the AUX_CH

bits of the auxiliary device modes register in accordance with

the switch mapping listed in Table 15. This mode is only

accessible through the serial control interface.

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