ADV7189B_15 datasheet(13/104 Pages) AD

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ADV7189B

Rev. B | Page 13 of 104

ANALOG FRONT END

ANALOG INPUT MUXING

AIN1

AIN7

AIN2

AIN8

AIN3

AIN9

AIN4

AIN10

AIN5

AIN11

AIN6

AIN12

AIN3

AIN9

AIN4

AIN10

AIN5

AIN11

AIN6

AIN12

AIN2

AIN8

AIN5

AIN11

AIN6

AIN12

ADC_SW_MAN_EN

INSEL[3:0]

ADC0_SW[3:0]

ADC1_SW[3:0]

ADC2_SW[3:0]

INTERNAL

MAPPING

FUNCTIONS

ADC2

ADC1

ADC0

Figure 6. Internal Pin Connections

The ADV7189B has an integrated analog muxing section that

allows more than one source of video signal to be connected to

the decoder.

139H

Figure 6 outlines the overall structure of the input

muxing provided in the ADV7189B.

As can be seen in

140H

Figure 6, there are two different ways in which

the analog input muxes can be controlled:

•

Control via functional registers (INSEL). Using INSEL[3:0]

simplifies the setup of the muxes, and minimizes crosstalk

between channels by pre-assigning the input channels.

This is referred to as ADI recommended input muxing.

•

Control via an I2C manual override (ADC_sw_man_en,

ADC0_sw, ADC1_sw, ADC2_sw). This is provided for

applications with special requirements, for example,

number/combinations of signals that would not be

served by the pre-assigned input connections. This is

referred to as manual input muxing.

Refer to

141H

Figure 7 for an overview of the two methods of

controlling the ADV7189B’s input muxing.

ADI Recommended Input Muxing

A maximum of 12 CVBS inputs can be connected and decoded

by the ADV7189B. As seen in

142H

Figure 5, this means the sources

have to be connected to adjacent pins on the IC. This calls for a

careful design of the PCB layout, for example, ground shielding

between all signals routed through tracks that are physically

close together.

INSEL[3:0] Input Selection, Address 0x00[3:0]

The INSEL bits allow the user to select an input channel as well

as the input format. Depending on the PCB connections, only

a subset of the INSEL modes are valid. The INSEL[3:0] does

not only switch the analog input muxing, it also configures the

standard definition processor core to process CVBS (Comp),

S-Video (Y/C), or component (YPbPr) format.

ADV7189B Datasheet(PDF) 13 Page - Analog Devices

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