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參數資料
| 型號： | THS7316DG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 3 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| 封裝： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數： | 8/28頁 |
| 文件大?。?/td> | 988K |
| 代理商： | THS7316DG4 |
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Input
Pin
800kW
Input
Cin
Internal
Circuitry
3.3V
3.01MW
140mVLevel
Shifter
R
PU
OUTPUT MODE OF OPERATION – DC COUPLED
SLOS521A – MARCH 2007 – REVISED JANUARY 2008
(1)
RPU denotes an external Pull-up Resistor
Figure 30. AC-Bias Input Mode Circuit Configuration
The dc voltage appearing at the input pin is approximately equal to:
VDC = VS+ × (800k ÷ (800k + RPU))
The THS7316 allowable input range is approximately (VS+ – 1.5 V) which allows for a wide input voltage range.
As such, the input dc-bias point is flexible with the output dc-bias point being the primary factor. For example, if
the output dc-bias point is desired to be 1.65 V on a 3.3-V supply, then the input dc-bias point should be (1.65 V
– 280 mV) /2 = 0.685 V. Thus, the pull-up resistor calculates to about 3.01-M
resulting in 0.693 V. If the input
dc-bias point is desired to be 0.685 V with a 5-V power supply, then the pull-up resistor calculates to about
5.1 M
.
The internal 800-k
resistor has approximately a ±20% variance. As such, the calculations should take this into
account. For the 0.693 V example above using an ideal 3.01-M
resistor, the input dc-bias voltage is about
0.693 V ±0.11 V.
One other issue that must be taken into account is that the dc-bias point is a function of the power supply. As
such, there may be an impact on power supply rejection (PSRR) on the system. To help reduce the impact, the
input capacitor combined with the pull-up resistance functions as a low-pass filter. Additionally, the time to charge
the capacitor to the final dc-bias point is also a function of the pull-up resistor and the input capacitor. Lastly, the
input capacitor forms a high-pass filter with the parallel impedance of the pull-up resistor and the 800-k
resistor.
It is good to have this high pass filter at about 3-Hz to minimize any potential droop on a P'B, P'R, or non-sync
signals. A 0.1-
F input capacitor with a 3.01-M pull-up resistor equates to about a 2.5-Hz high-pass corner
frequency.
This mode of operation is recommended for use with chroma (C'), P’B, P'R, U', V', and non-sync B' and/or R'
signals.
The THS7316 incorporates a rail-to-rail output stage that can be used to drive the line directly without the need
for large ac-coupling capacitors as shown in Figure 31. This offers the best line tilt and field tilt (or droop)
performance since there is no ac-coupling occurring. Remember that if the input is ac-coupled, then the resulting
tilt due to the input ac-coupling is seen on the output regardless of the output coupling. The 80-mA output current
drive capability of the THS7316 was designed to drive two video lines per channel simultaneously – essentially a
75-
load – while keeping the output dynamic range as wide as possible.
16
Copyright 2007–2008, Texas Instruments Incorporated
Product Folder Link(s) :THS7316
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相關代理商/技術參數 |
參數描述 |
|---|---|
| THS7316DR | 功能描述:視頻放大器 3-Ch HDTV Video Amp RoHS:否 制造商:ON Semiconductor 通道數量: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 |
| THS7316DRG4 | 功能描述:視頻放大器 3-Ch HDTV Video Amp RoHS:否 制造商:ON Semiconductor 通道數量: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 |
| THS7316EVM | 功能描述:放大器 IC 開發(fā)工具 THS7316 Eval Mod RoHS:否 制造商:International Rectifier 產品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
| THS7318 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3-Channel Low-Power EDTV/SDTV Video Line Driver With Low-Pass Filters |
| THS7318_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3-Channel Low-Power EDTV/SDTV Video Line Driver With Low-Pass Filters |
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