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參數(shù)資料
| 型號： | TVP5040PFP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 顏色信號轉(zhuǎn)換 |
| 英文描述： | COLOR SIGNAL DECODER, PQFP80 |
| 封裝： | POWER, PLASTIC, TQFP-80 |
| 文件頁數(shù)： | 12/101頁 |
| 文件大?。?/td> | 464K |
| 代理商： | TVP5040PFP |
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2–2
2.1.1
Video Input Selection
The TVP5040 has two analog channels that accept four video inputs ac-coupled through 0.1
F capacitors. The
internal video multiplexers can be configured via the host port. The four analog video inputs may be connected as
follows:
Four selectable individual composite video inputs
1 S-video input and two composite video inputs
2 S-video inputs
2.1.2
Analog Input Clamping and Automatic Gain Control Circuits
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. Two modes of clamping are provided,
coarse and fine. In coarse mode, the most negative portion of the input signal (typically the sync tip) is clamped to
a fixed dc level. Fine clamp mode may be enabled to prevent spurious level shifting caused by noise more negative
than the sync tip on the input signal. If fine clamp mode is selected, clamping is only enabled during the sync period.
S-video requires fine clamp mode on the chroma channel for proper operation. External capacitors of 0.1
F on
terminal CLAMP1 and CLAMP2 are required to store and filter the clamp voltage.
The input video signal amplitude may vary significantly from the nominal level of 1 Vpp. An automatic gain control
circuit (AGC) adjusts the signal amplitude to utilize the maximum range of the A/D converter without clipping. The
AGC adjusts gain to achieve desired sync amplitude. Some nonstandard video signals contain peak white levels that
saturate the A/D converter. In these cases, AGC automatically cuts back gain to avoid clipping.
In the digital data path, scaling is applied to the A/D output data to reach CCIR601 Y, Cr, and Cb levels. This scaling
introduces distortion if digitized sync tip and back porch levels are not precise. The fine gain and offset adjustment
block precisely controls the sync tip and back porch levels to achieve best linearity performance.
2.1.3
A/D Converters
The TVP5040 contains two 10-bit 2x oversampling A/D converters that digitize the analog video inputs. As the inputs
are digitized at greater than two times the Nyquist sampling rate, only simple external antialiasing low pass filters are
needed to prevent out-of-band frequencies. The A/D converter reference voltages on terminals REFP and REFM
require an external capacitor network for filtering, as shown in Figure 2–1.
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