ADV7181BCP Analog Devices Inc, ADV7181BCP Datasheet - Page 13

• Manufacturer Part Number: ADV7181BCP
• Description: IC VIDEO DECODER NTSC 64-LFCSP
• Manufacturer: Analog Devices Inc
• Type: Video Decoderr

Specifications of ADV7181BCP

• Applications: Recorders, Set-Top Boxes
• Voltage - Supply, Analog: 3.15 V ~ 3.45 V
• Voltage - Supply, Digital: 1.65 V ~ 2 V
• Mounting Type: Surface Mount
• Package / Case: 64-LFCSP
• Adc/dac Resolution: 9b
• Screening Level: Industrial
• Package Type: LFCSP EP
• Pin Count: 64
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With: EVAL-ADV7181BEB - BOARD EVALUATION FOR ADV7181
• Lead Free Status / RoHS Status: Compliant, Contains lead / RoHS non-compliant

ANALOG FRONT END
There are two key steps to configure the ADV7181 to correctly
decode the input video. Descriptions of these steps follow.
•
•
ANALOG INPUT MUXING
The ADV7181 has an integrated analog muxing section that
allows more than one source of video signal to be connected to
the decoder. Figure 5 outlines the overall structure of the input
muxing provided in the ADV7181.
A maximum of six CVBS inputs can be connected and decoded
by the ADV7181. As seen in the Pin Configuration and
Function Description section, these analog input pins lie in
close proximity to one another. 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.
It is strongly recommended to connect any unused analog input
pins to AGND to act as a shield.
The analog input muxing section must be configured to
correctly route the video from the analog input pins to the
correct set of ADCs.
The standard definition processor block, which decodes
the digital data, should be configured to process either
CVBS, YC, or YPrPb.
Figure 5. Internal Pin Connections
Rev. B | Page 13 of 104
ADC_SW_MAN_EN
AIN2
AIN1
AIN4
AIN3
AIN6
AIN5
AIN4
AIN3
AIN6
AIN5
AIN6
AIN5
SETADC_sw_man_en, Manual Input Muxing Enable,
Address C4 [7]
ADC0_sw[3:0], ADC0 mux configuration, Address C3 [3:0]
ADC1_sw[3:0], ADC1 mux configuration, Address C3 [7:4]
ADC2_sw[3:0], ADC2 mux configuration, Address C4 [3:0]
To configure the ADV7181 analog muxing section, the user
must select the analog input (AIN1–AIN6) that is to be
processed by each ADC. SETADC_sw_man_en must be set to 1
to enable the muxing blocks to be configured. The three mux
sections are controlled by the signal buses ADC0/1/2_sw[3:0].
Table 8 explains the control words used.
The input signal that contains the timing information (H/V
syncs) must be processed by ADC0. For example, in YC input
configuration, ADC0 should be connected to the Y channel and
ADC1 to the C channel. In cases where one or more ADCs are
not used to process video, for example, CVBS input, the idle
ADCs should be powered down, (see the ADC Power-Down
Control section).
Restrictions are imposed on the channel routing by the analog
signal routing inside the IC; every input pin cannot be routed to
each ADC. Refer to Table 8 for an overview on the routing
capabilities inside the chip.
ADC0_SW[3:0]
ADC1_SW[3:0]
ADC0_SW[3:0]
ADC0
ADC1
ADC2
ADV7181