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參數(shù)資料
| 型號： | THS7360IPW |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | VIDEO AMPLIFIER, PDSO20 |
| 封裝： | GREEN, PLASTIC, TSSOP-20 |
| 文件頁數(shù)： | 17/43頁 |
| 文件大?。?/td> | 962K |
| 代理商： | THS7360IPW |
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SLOS674 – JUNE 2010
www.ti.com
Note that the Y’ term is used for the luma channels
INPUT MODE OF OPERATION: DC
throughout this document rather than the more
The inputs to the THS7360 allow for both ac- and
common luminance (Y) term. This usage accounts for
dc-coupled inputs. Many DACs or video encoders can
the definition of luminance as stipulated by the
be dc-connected to the THS7360. One of the
drawbacks to dc-coupling is when 0 V is applied to
departs from true luminance because a nonlinear
the input. Although the input of the THS7360 allows
term, gamma, is added to the true RGB signals to
for a 0-V input signal without issue, the output swing
form R’G’B’ signals. These R’G’B’ signals are then
of a traditional amplifier cannot yield a 0-V signal,
used to mathematically create luma (Y’). Thus,
resulting in possible clipping. This limitation is true for
luminance
(Y)
is
not
maintained,
providing
a
any
single-supply
amplifier
because
of
the
difference in terminology.
characteristics of the output transistors. Neither
This rationale is also used for the chroma (C’) term.
CMOS nor bipolar transistors can achieve 0 V while
Chroma is derived from the nonlinear R’G’B’ terms
sinking current. This transistor characteristic is also
and, thus, it is nonlinear. Chominance (C) is derived
the same reason why the highest output voltage is
from linear RGB, giving the difference between
always less than the power-supply voltage when
chroma
(C’)
and
chrominance
(C).
The
color
sourcing current.
difference signals (P’B/P’R/U’/V’) are also referenced
This output clipping can reduce the sync amplitudes
in this manner to denote the nonlinear (gamma
(both horizontal and vertical sync) on the video
corrected) signals.
signal. A problem occurs if the video signal receiver
R’G’B’ (commonly mislabeled RGB) is also called
uses an automatic gain control (AGC) loop to account
G’B’R’ (again commonly mislabeled as GBR) in
for losses in the transmission line. Some video AGC
professional video systems. The Society of Motion
circuits
derive
gain
from
the
horizontal
sync
Picture
and
Television
Engineers
(SMPTE)
amplitude. If clipping occurs on the sync amplitude,
component
standard
stipulates
that
the
luma
then the AGC circuit can increase the gain too
information is placed on the first channel, the blue
much—resulting in too much luma and/or chroma
color difference is placed on the second channel, and
amplitude gain correction. This correction may result
the red color difference signal is placed on the third
in a picture with an overly bright display with too
channel. This practice is consistent with the Y'/P'B/P'R
much color saturation.
nomenclature. Because the luma channel (Y') carries
Other AGC circuits use the chroma burst amplitude
the sync information and the green channel (G') also
for amplitude control; reduction in the sync signals
carries the sync information, it makes logical sense
does not alter the proper gain setting. However, it is
that G' be placed first in the system. Because the
good engineering design practice to ensure that
blue color difference channel (P'B) is next and the red
saturation/clipping does not take place. Transistors
color difference channel (P'R) is last, then it also
always take a finite amount of time to come out of
makes logical sense to place the B' signal on the
saturation. This saturation could possibly result in
second channel and the R' signal on the third
timing delays or other aberrations on the signals.
channel, respectfully. Thus, hardware compatibility is
better achieved when using G'B'R' rather than R'G'B'.
To eliminate saturation or clipping problems, the
Note that for many G'B'R' systems, sync is embedded
THS7360 has an input level shift feature. The
on all three channels, but this configuration may not
resulting output with a 0-V applied input signal is
always be the case in all systems.
approximately 120 mV. The THS7360 rail-to-rail
output stage can create this output level while
connected to a typical video load. This configuration
ensures that no saturation or clipping of the sync
signals occur. This shift is constant, regardless of the
input signal. For example, if a 0.1-V input is applied
to the SD channel, the output is 0.1V X 5.6 V/V +
0.12V = 0.68 V.
24
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): THS7360
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| THS7364IPW | 6 CHANNEL, VIDEO AMPLIFIER, PDSO20 |
| THS7365IPWR | 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 |
|---|---|
| THS7360IPW | 制造商:Texas Instruments 功能描述:VIDEO AMPLIFIER IC |
| THS7360IPWR | 功能描述:視頻放大器 6-Channel 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 |
| THS7364 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:6-Channel Video Amplifier with 3 SD and 3 Full-HD Filters with 6-dB Gain |
| THS7364_10 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:6-Channel Video Amplifier with 3 SD and 3 Full-HD Filters with 6-dB Gain |
| THS7364EVM | 功能描述:放大器 IC 開發(fā)工具 THS7364 Eval Mod RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
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