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参数资料
| 型号： | THS7303PW |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 3 CHANNEL, VIDEO AMPLIFIER, PDSO20 |
| 封装： | GREEN, PLASTIC, TSSOP-20 |
| 文件页数： | 24/60页 |
| 文件大小： | 1980K |
| 代理商： | THS7303PW |
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GND
CH.2 IN B
CH.3 IN B
I 2C-A0
SDA
VS+ 11
12
13
14
15
16
17
18
19
20
SCL
CH.3 SAG
I 2C-A1
CH.1 IN B
CH.2 IN A
CH.3 IN A
CH.1 IN A
NC
CH.3 OUT
CH.2 SAG
CH.2 OUT
CH.1 SAG
CH.1 OUT
NC
1
2
3
4
5
6
7
8
9
10
P’R
Out 2
+
P’R
Out 1
+
P’B
Out 2
+
P’B
Out 1
+
Y’
Out 2
+
Y’
Out 1
+
DAC /
Encoder
(THS8200)
Y’
P’B
P’R
External
Input
Y’
P’B
P’R
R
HDTV
480i
576i
480p
576p
720p
1080i
1080p
3.3V
75 W
0.1 F
m
0.01 F
m
470 F
(SeeNote A)
m
470 F
(SeeNote A)
m
470 F
(SeeNote A)
m
470 F
(SeeNote A)
m
470 F
(SeeNote A)
m
470 F
(SeeNote A)
m
100 F
m
1 F
m
1 F
m
3.3V
I C
Controller
2
ACSTC
ACBias
DC+135mV
SLOS479B
– OCTOBER 2005 – REVISED MARCH 2011
OUTPUT MODES OF OPERATION: AC-COUPLED
The most common method of coupling the video signal to the line is by using a large capacitor. This capacitor is
typically between 220
μF and 1000 μF, although 470 μF is most common. This value of this capacitor must be
this large to minimize the line tilt (droop) and/or field tilt associated with ac coupling as described previously in
this document. Just like the dc output configuration, connection of the output pin of each channel directly to the
SAG output pin of the corresponding channel should be as close as possible to the output pins of the THS7303.
The most common reason ac coupling is used is to ensure full interoperability with the receiving video system.
This ensures that regardless of the reference dc voltage used on the transmit side of the video signal, the receive
side will re-establish the dc reference voltage to its own requirements without any interaction from the transmit
side dc bias voltage.
As with the dc output mode of operation, each line should have a 75-
source termination resistor in series with
the ac-coupling capacitor. If two lines are to be driven, it is best to have each line use its own capacitor and
resistor rather than sharing these components, as shown in Figure 65.This helps ensure line-to-line dc isolation
and other potential problems. Using a single 1000-
μF capacitor for two lines can be done, but there is a chance
for interference between the two receivers.
A.
Due to the high frequency content of the video signal, it is recommended, but not required, to add a 0.01-
μF capacitor
in parallel with these large capacitors.
Figure 65. Typical Y
'P'BP'R System Driving 2 AC-Coupled Video Lines
Because of the edge rates and frequencies of operation, it is recommended (but not required) to place a 0.1-
μF
to 0.01-
μF capacitor in parallel with the large 220-μF to 1000-μF capacitors. These large value capacitors are
most commonly aluminum electrolytic. It is well known that these capacitors have significantly large equivalent
series resistance (ESR), and their impedance at high frequencies is large as a result of the associated
inductances involved with their construction. The small 0.1-
μF to 0.01-μF capacitors help pass these
high-frequency (
> 1 MHz) signals with lower impedance than the large capacitors. This is especially true when
HD and computer R'G'B' signals are being used. Their associated edge rates and frequency content can reach
beyond 30-MHz for HD signals and can be over 100-MHz for R'G'B' signals
—frequencies that typical aluminum
electrolytic capacitors typically cannot pass effectively.
30
Copyright
2005–2011, Texas Instruments Incorporated
Product Folder Link(s): THS7303
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相关代理商/技术参数 |
参数描述 |
|---|---|
| THS7303PWG4 | 功能描述:视频放大器 3-Ch Low Power Video RoHS:否 制造商:ON Semiconductor 通道数量:4 电源类型: 工作电源电压:3.3 V, 5 V 电源电流: 最小工作温度: 最大工作温度: 封装 / 箱体:TSSOP-14 封装:Reel |
| THS7303PWR | 功能描述:视频放大器 3-Ch Low Power Video RoHS:否 制造商:ON Semiconductor 通道数量:4 电源类型: 工作电源电压:3.3 V, 5 V 电源电流: 最小工作温度: 最大工作温度: 封装 / 箱体:TSSOP-14 封装:Reel |
| THS7303PWRG4 | 功能描述:视频放大器 3-Ch Low Power Video RoHS:否 制造商:ON Semiconductor 通道数量:4 电源类型: 工作电源电压:3.3 V, 5 V 电源电流: 最小工作温度: 最大工作温度: 封装 / 箱体:TSSOP-14 封装:Reel |
| THS730A A2 | 制造商:Tektronix Inc 功能描述:OSCILLOSCOPE DSO/DMM 200MHZ |
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