参数资料
型号: TVP5146M1PFP
厂商: TEXAS INSTRUMENTS INC
元件分类: 颜色信号转换
英文描述: COLOR SIGNAL DECODER, PQFP80
封装: POWERPAD, PLASTIC, QFP-80
文件页数: 14/104页
文件大小: 593K
代理商: TVP5146M1PFP
21
2 Functional Description
2.1
Analog Processing and A/D Converters
Figure 21 shows a functional diagram of the analog processors and ADCs. This block provides the analog interface
to all video inputs. It accepts up to 10 inputs and performs source selection, video clamping, video amplification, A/D
conversion, and gain and offset adjustments to center the digitized video signal.
Clamp
PGA
10-Bit
ADC
CH4 A/D
PGA
CH1 A/D
PGA
CH2 A/D
PGA
CH3 A/D
Line-Locked Sampling Clock
TVP5146 Analog Front End
VI_4_A
M
U
X
VI_1_A
VI_1_B
VI_1_C
M
U
X
VI_2_A
VI_2_B
VI_2_C
M
U
X
VI_3_A
VI_3_B
VI_3_C
10-Bit
ADC
10-Bit
ADC
10-Bit
ADC
Clamp
Figure 21. Analog Processors and A/D Converters
2.1.1
Video Input Switch Control
The TVP5146 decoder has 4 analog channels that accept up to 10 video inputs. The user can configure the internal
analog video switches via the I2C interface. The 10 analog video inputs can be used for different input configurations,
some of which are:
Up to 10 selectable individual composite video inputs
Up to four selectable S-video inputs
Up to three selectable analog YPbPr/RGB video inputs and one CVBS input
Up to two selectable analog YPbPr/RGB video inputs, two S-video inputs, and two CVBS inputs
The input selection is performed by the input select register at I2C subaddress 00h (see Section 2.11.1).
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