ADV7188BSTZ datasheet(13/112 Pages) AD

13 / 112 page

ADV7188

Rev. A | Page 13 of 112

ANALOG INPUT MUXING

The ADV7188 has an integrated analog muxing section that

allows connecting more than one source of video signal to the

decoder. Figure 6 outlines the overall structure of the input

muxing provided in the ADV7188.

As can be seen in Figure 6, the analog input muxes can be

controlled in two ways:

•

By the functional register (INSEL). Using INSEL [3:0]

simplifies the setup of the muxes and minimizes crosstalk

between channels by preassigning the input channels. This is

referred to as the recommended input muxing.

•

By an I2C manual override (ADC_SW_MAN_EN,

ADC0_SW, ADC1_SW, ADC2_SW, and ADC3_SW). This

is provided for applications with special requirements, such

as number/combinations of signals that are not served by

the preassigned input connections. This is referred to as

manual input muxing.

Figure 7 shows an overview of the two methods of controlling

input muxing.

SET INSEL[3:0] TO

CONFIGURE ADV7188

TO DECODE VIDEO FORMAT:

CVBS: 0000

Y/C: 0110

YPrPb: 1001

SCART (CVBS/RGB): 1111

SET SDM_SEL[1:0] FOR

S-VIDEO/COMPOSITE

AUTODETECT

USE MANUAL INPUT MUXING

(ADC_SW_MAN_EN, ADC0_SW,

ADC1_SW, ADC2_SW,

ADC3_SW)

SET INSEL[3:0] AND

SDM_SEL[1:0]

FOR REQUIRED MUXING

CONFIGURATION

CONNECTING

ANALOG SIGNALS

TO ADV7188

RECOMMENDED

INPUT MUXING;

SEE TABLE 8 AND TABLE 9?

YES

Figure 7. Input Muxing Overview

Recommended Input Muxing

A maximum of 12 CVBS inputs can be connected and decoded

by the ADV7188, meaning that the sources must be connected

to adjacent pins on the IC, as seen in Figure 5. This calls for a

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

shielding between all signals routed through tracks that are

physically close together.

SDM_SEL [1:0], Y/C and CVBS Autodetect Mode Select,

Address 0x69 [1:0]

The SDM_SEL bits decide on input routing and whether

INSEL [3:0] is used to govern input routing decisions.

The S-video/composite autodetection feature is enabled using

SDM_SEL = 11.

Table 8. SDM_SEL [1:0]

SDM_SEL [1:0]

Mode

Analog Video Inputs

As per INSEL [3:0]

CVBS

AIN11

Y/C

Y = AIN10

C = AIN12

S-video/composite

autodetection

CVBS = AIN11

Y = AIN11

C = AIN12

ADV7188BSTZ Datasheet(PDF) 13 Page - Analog Devices

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