參數(shù)資料
型號： ADV7184BSTZ
廠商： Analog Devices Inc
文件頁數(shù)： 18/112頁
文件大?。?/td> 0K
描述： IC DECODER VID SDTV MULTI 80LQFP
標準包裝： 1
類型： 視頻解碼器
應(yīng)用： 投影儀，錄音機，安全
電壓 - 電源，模擬： 3.15 V ~ 3.45 V
電壓 - 電源，數(shù)字： 1.65 V ~ 2 V
安裝類型： 表面貼裝
封裝/外殼： 80-LQFP
供應(yīng)商設(shè)備封裝： 80-LQFP（14x14）
包裝： 托盤
ADV7184
Rev. A | Page 13 of 112
ANALOG INPUT MUXING
The ADV7184 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 ADV7184.
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.
05
47
9-
00
7
SET SDM_SEL[1:0] AND
INSEL[3:0] TO CONFIGURE
ADV7184 TO DECODE
VIDEO FORMAT:
CVBS: 0000
YC: 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 SDM_SEL[1:0] AND
INSEL[3:0]
FOR REQUIRED MUXING
CONFIGURATION
CONNECTING
ANALOG SIGNALS
TO ADV7184
RECOMMENDED
INPUT MUXING;
SEE TABLE 8 AND TABLE 9?
NO
YES
Figure 7. Input Muxing Overview
Recommended Input Muxing
A maximum of 12 CVBS inputs can be connected and decoded
by the ADV7184, 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
00
As per INSEL [3:0]
01
CVBS
AIN11
10
Y/C
Y = AIN10
C = AIN12
11
S-video/composite
autodetection
CVBS = AIN11
Y = AIN11
C = AIN12
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