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參數(shù)資料
| 型號(hào)： | TSH343IDT |
| 廠(chǎng)商： | STMICROELECTRONICS |
| 元件分類(lèi)： | 音頻／視頻放大 |
| 英文描述： | 3 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| 封裝： | ROHS COMPLIANT, PLASTIC, SOP-8 |
| 文件頁(yè)數(shù)： | 3/17頁(yè) |
| 文件大?。?/td> | 311K |
| 代理商： | TSH343IDT |
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TSH343
Application information
11/17
Figure 27.
Detailed view of one TSH343 channel
Because of the shape of the signal shown in Figure 25, we use a very low output rail triple
high-speed buffer. The TSH343 supplied in 5V single power supply, features a low output rail
of 40mV on 150-ohm load. The TSH343 is used to drive high definition video signals up to
30MHz on 75-ohm video lines. It is dedicated to driving YPbPr signals where the
synchronization tip—close to zero volt—is included in the Y signal.
Figure 27 shows a solution used on the STMicroelectronics reference design of STi7100 or
STi7200 where the DAC output is loaded by 140
Ω and the bottom of the synchronization tip
is set at 10mV. Using the TSH343, an internal input DC value of 600mV is added to the
video signal in order to shift the bottom from 10mV to 610mV. The shift is not based on the
average of the signal, but is an analog summation of a DC component to the video signal.
Therefore, no input capacitors are required which provides a real advantage in terms of cost
and board space.
The internal gain of 2 obtained makes it possible to remove two resistors on the BOM. To
avoid any perturbation on matching from the DACs output impedance along a large band of
30MHz in HD, a discrete reconstruction filtering is implemented after the driver. This filter is
matched on 75-ohms. Note that the TSH343 cannot be AC output coupled (it cannot sink an
output current, therefore it is not possible to implement an output series capacitor).
video line
+5V
1/3 TSH343
(gain=2)
0V
0Volt
5Volt
DAC
68pF
470nH
75
Ω
75
Ω
TV
STB
1,22V
(10mV+600mV)*gain
3,22V
0Volt
5Volt
10mV
1,01V
0Volt
610mV
1,61V
140
Ω
+
600mV
DC
-5V
5Volt
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TSH344 | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:340MHz single-supply triple video buffer |
| TSH344_07 | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:340MHz single-supply triple video buffer |
| TSH344I | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:340MHz Single-Supply Triple Video Buffer |
| TSH344ID | 功能描述:視頻放大器 340MHz Sngl supply triple video buffer RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類(lèi)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 |
| TSH344IDT | 功能描述:視頻 IC 340MHz Single-Supply Triple Video Buffer RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
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