參數(shù)資料
型號(hào)： THS7364IPWR
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, PLASTIC, TSSOP-20
文件頁(yè)數(shù)： 26/47頁(yè)
文件大?。?/td> 1134K
代理商： THS7364IPWR
SBOS530 – AUGUST 2010
www.ti.com
One other issue that must be taken into account is
to 100% yellow for P’B signal or 100% cyan for P’R
the dc-bias point is a function of the power supply. As
signal . Because the P’B and P’R signal voltage can
such, there is an impact on system PSRR. To help
be lower than the sync voltage, there exists a
reduce this impact, the input capacitor combines with
potential for clipping of the signal for a short period of
the pull-up resistance to function as a low-pass filter.
time if the signals drop below the sync voltage.
Additionally, the time to charge the capacitor to the
The THS7364 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-mF input capacitor
output.
with
a
3.3-M
pull-up
resistor
equates
to
approximately a 2.5-Hz high-pass corner frequency.
Another potential risk is that if this signal (100%
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
opposed to a back-porch voltage that fluctuates
It is therefore recommended to use ac bias mode for
depending
on
the
video
content.
Because
the
component P’B and P’R signals when ac-coupling is
high-pass corner frequency is a very low 2.5 Hz, the
desired.
impact on the video signal is negligible relative to the
STC configuration.
OUTPUT MODE OF OPERATION:
One question may arise over the P’B and P’R
DC-COUPLED
channels. For 480i, 576i, 480p, and 576p signals, a
The THS7364 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)
For 720p, 1080i, and 1080p signals, or for the the
performance because no ac-coupling occurs. Keep in
480i, 576i, 480p, and 576p signals with sync present
mind that if the input is ac-coupled, then the resulting
on the P’B and P’R channels, the lowest voltage of the
tilt as a result of the input ac-coupling continues to be
sync is –300 mV below the midpoint reference
seen on the output, regardless of the output coupling.
voltage of 0 V. The P’B and P’R signals allow a signal
The 80-mA output current drive capability of the
to be as low as –350 mV below the midpoint
THS7364 is designed to drive two video lines
reference voltage of 0 V. This allowance corresponds
simultaneously—essentially,
a
75-
load—while
keeping the output dynamic range as wide as
possible. Figure 81 shows the THS7364 driving two
video lines while keeping the output dc-coupled.
32
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): THS7364
相關(guān)PDF資料
PDF描述
THS7364IPW 6 CHANNEL, VIDEO AMPLIFIER, PDSO20
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
THS7365 制造商:TI 制造商全稱:Texas Instruments 功能描述:6-Channel Video Amplifier with 3-SD and 3-HD Sixth-Order Filters and 6-dB Gain
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