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參數(shù)資料
型號(hào)： TVP5147PFPRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 顏色信號(hào)轉(zhuǎn)換
英文描述： COLOR SIGNAL DECODER, PQFP80
封裝： GREEN, PLASTIC, HTQFP-80
文件頁(yè)數(shù)： 10/100頁(yè)
文件大小： 1465K
代理商： TVP5147PFPRG4
Functional Description
10
SLES099C—March 2007
TVP5147PFP
Up to 10 selectable individual composite video inputs
Up to four selectable S-video inputs
Up to three selectable analog YPbPr video inputs and one CVBS input
Up to two selectable analog YPbPr 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).
2.1.2 Analog Input Clamping
An internal clamping circuit restores the ac-coupled video signal to a fixed dc level. The clamping circuit
provides line-by-line restoration of the video sync level to a fixed dc reference voltage. The selection between
bottom and mid clamp is performed automatically by the TVP5147 decoder.
2.1.3 Automatic Gain Control
The TVP5147 decoder uses two programmable gain amplifiers (PGAs), one per channel. The PGA can scale
a signal with a voltage-input compliance of 0.5-VPP to 2.0-VPP to a full-scale 10-bit A/D output code range.
A 4-bit code sets the coarse gain with individual adjustment per channel. Minimum gain corresponds to a code
0x0 (2.0-VPP full-scale input, 6-dB gain) while maximum gain corresponds to code 0xF (0.5 VPP full scale,
+6-dB gain). The TVP5147 decoder also has 12-bit fine gain controls for each channel and applies
independently to coarse gain controls. For composite video, the input video signal amplitude can vary
significantly from the nominal level of 1 VPP. The TVP5147 decoder can adjust its PGA setting automatically:
an automatic gain control (AGC) can be enabled and can adjust the signal amplitude such that the maximum
range of the ADC is reached without clipping. Some nonstandard video signals contain peak white levels that
saturate the ADC. In these cases, the AGC automatically cuts back gain to avoid clipping. If the AGC is on,
then the TVP5147 decoder can read the gain currently being used.
The TVP5147 AGC comprises the front-end AGC before Y/C separation and the back-end AGC after Y/C
separation. The back-end AGC restores the optimum system gain whenever an amplitude reference such as
the composite peak (which is only relevant before Y/C separation) forces the front-end AGC to set the gain
too low. The front-end and back-end AGC algorithms can use up to four amplitude references: sync height,
color burst amplitude, composite peak, and luma peak.
The specific amplitude references being used by the front-end and back-end AGC algorithms can be
independently controlled using the AGC white peak processing register located at subaddress 74h. The
TVP5147 gain increment speed and gain increment delay can be controlled using the AGC increment speed
register located at subaddress 78h and the AGC increment delay register located at subaddress 79h.
2.1.4 Analog Video Output
One of the analog input signals is available at the analog video output terminal, which is shared with input
selected by I2C registers. The signal at this terminal must be buffered by a source follower. The nominal output
voltage is 2 V p-p, thus the signal can be used to drive a 75-
line. The magnitude is maintained with an AGC
in 16 steps controlled by the TVP5147 decoder. In order to use this function, terminal VI_1_A must be set as
an output terminal. The input mode selection register also selects an active analog output signal.
2.1.5 A/D Converters
All ADCs have a resolution of 10 bits and can operate up to 30 MSPS. All A/D channels receive an identical
clock from the on-chip phase-locked loop (PLL) at a frequency between 24 MHz and 30 MHz. All ADC
reference voltages are generated internally.
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