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參數(shù)資料
| 型號： | THS7368IPW |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 6 CHANNEL, VIDEO AMPLIFIER, PDSO20 |
| 封裝： | GREEN, TSSOP-20 |
| 文件頁數(shù)： | 18/40頁 |
| 文件大?。?/td> | 1123K |
| 代理商： | THS7368IPW |
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SBOS497 – DECEMBER 2009
Macrovision, the CVBS signal can reach up to
For 720p, 1080i, and 1080p signals, or for the the
1.23 VPP at the input, or 2.46 VPP at the output of the
480i, 576i, 480p, and 576p signals with sync present
THS7368. In contrast, other signals are typically
on the P’B and P’R channels, the lowest voltage of the
1 VPP or 0.7 VPP at the input which translate to an
sync is –300 mV below the midpoint reference
output voltage of 2 VPP or 1.4 VPP. The output bias
voltage of 0 V. The P’B and P’R signals allow a signal
voltage must account for a worst-case situation,
to be as low as –350 mV below the midpoint
depending on the signals involved.
reference voltage of 0 V. This allowance corresponds
to 100% yellow for P’B signal or 100% cyan for P’R
One other issue that must be taken into account is
signal . Because the P’B and P’R signal voltage can
the dc-bias point is a function of the power supply. As
be lower than the sync voltage, there exists a
such, there is an impact on system PSRR. To help
potential for clipping of the signal for a short period of
reduce this impact, the input capacitor combines with
time if the signals drop below the sync voltage.
the pull-up resistance to function as a low-pass filter.
Additionally, the time to charge the capacitor to the
The THS7368 does include a 150-mV input level
final dc bias point is a function of the pull-up resistor
shift, or 300 mV at the output, that should mitigate
and the input capacitor size. Lastly, the input
any clipping issues. For example, if a STC is used,
capacitor forms a high-pass filter with the parallel
then the bottom of the sync is 300 mV at the output.
impedance of the pull-up resistor and the 800-k
If the signal does go the lowest level, or 50 mV lower
resistor. In general, it is good to have this high-pass
than the sync at the input, then the instantaneous
filter at approximately 3 Hz to minimize any potential
output is (–50 mV + 150 mV) × 2 = 200 mV at the
droop on a P’B or P’R signal. A 0.1-μF input capacitor
output.
with
a
3.3-M
pull-up
resistor
equates
to
Another potential risk is that if this signal (100%
approximately a 2.5-Hz high-pass corner frequency.
yellow for P’B or 100% cyan for P’R) exists for several
This mode of operation is recommended for use with
pixels, then the STC circuit engages to raise the
chroma (C’), P’B, P’R, U’, and V’ signals. This method
voltage back to 0 V at the input. This function can
can also be used with sync signals if desired. The
cause a 50-mV level shift at the input midway through
benefit of using the STC function over the ac-bias
the active video signal. This effect is undesirable and
configuration on embedded sync signals is that the
can cause errors in the decoding of the signal.
STC maintains a constant back-porch voltage as
It is therefore recommended to use ac bias mode for
opposed to a back-porch voltage that fluctuates
component P’B and P’R signals when ac-coupling is
depending
on
the
video
content.
Because
the
desired.
high-pass corner frequency is a very low 2.5 Hz, the
impact on the video signal is negligible relative to the
STC configuration.
OUTPUT MODE OF OPERATION:
DC-COUPLED
One question may arise over the P’B and P’R
channels. For 480i, 576i, 480p, and 576p signals, a
The THS7368 incorporates a rail-to-rail output stage
sync may or may not be present. If no sync exists
that can be used to drive the line directly without the
within the signal, then it is obvious that ac-bias is the
need for large ac-coupling capacitors. This design
preferred method of ac-coupling the signal.
offers
the
best
line
tilt
and
field
tilt
(droop)
performance because no ac-coupling occurs. Keep in
mind that if the input is ac-coupled, then the resulting
tilt as a result of the input ac-coupling continues to be
seen on the output, regardless of the output coupling.
The 80-mA output current drive capability of the
THS7368 is designed to drive two video lines
simultaneously—essentially,
a
75-
load—while
keeping the output dynamic range as wide as
possible. Figure 41 shows the THS7368 driving two
video lines while keeping the output dc-coupled.
Copyright 2009, Texas Instruments Incorporated
25
Product Folder Link(s): THS7368
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| THS7368IPW | 制造商:Texas Instruments 功能描述:Video Amplifier IC 制造商:Texas Instruments 功能描述:IC, VIDEO AMPLIFIER, HEX, 350MHZ TSSOP20 |
| THS7368IPWR | 功能描述:視頻放大器 6-Ch Video Amp RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
| THS7371IPW | 制造商:Texas Instruments 功能描述:VIDEO OPAM - Rail/Tube |
| THS7371IPWR | 制造商:Texas Instruments 功能描述:VIDEO OPAM - Tape and Reel |
| THS7372 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4-Channel Video Amplifier with One CVBS and Three Full-HD Filters with 6-dB Gain |
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