EVAL-ADV7183BEB View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
'EVAL-ADV7183BEB' PDF : 104 Pages View PDF
ANALOG FRONT END
ANALOG INPUT MUXING
ADV7183A
ADC_SW_MAN_EN
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
INSEL[3:0]
INTERNAL
MAPPING
FUNCTIONS
1
ADC0_SW[3:0]
0
ADC0
1
ADC1_SW[3:0]
0
ADC1
1
ADC1_SW[3:0]
0
ADC2
Figure 6. Internal Pin Connections
The ADV7183A has an integrated analog muxing section that
allows more than one source of video signal to be connected to
the decoder. Figure 6 outlines the overall structure of the input
muxing provided in the ADV7183A.
As can be seen in Figure 6, there are two 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 Figure 7 for an overview of the two methods of
controlling the ADV7183A’s input muxing.
ADI Recommended Input Muxing
A maximum of 12 CVBS inputs can be connected and decoded
by the ADV7183A. As can be seen in Figure 5, the sources have
to be connected to adjacent pins on the IC. This calls for a care-
ful 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.
Rev. B | Page 13 of 104
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