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參數(shù)資料
型號(hào)： THS7372IPWR
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 音頻／視頻放大
英文描述： 4 CHANNEL, VIDEO AMPLIFIER, PDSO14
封裝： GREEN, PLASTIC, TSSOP-14
文件頁(yè)數(shù)： 25/49頁(yè)
文件大小： 1768K
代理商： THS7372IPWR
Level
Shift
Internal
Circuitry
+V
S
800kW
Input
Pin
SBOS578
– AUGUST 2011
The input impedance of the THS7372 in this mode of operation is dictated by the internal, 800-k
pull-down
resistor, as shown in Figure 85. Note that the internal voltage shift does not appear at the input pin; it only shows
at the output pin.
Figure 85. Equivalent DC Input Mode Circuit
INPUT MODE OF OPERATION: AC SYNC TIP CLAMP
Some video DACs or encoders are not referenced to ground but rather to the positive power supply. The
resulting video signals are generally at too great a voltage for a dc-coupled video buffer to function properly. To
account for this scenario, the THS7372 incorporates a sync-tip clamp circuit. This function requires a capacitor
(nominally 0.1
μF) to be in series with the input. Although the term sync-tip-clamp is used throughout this
document, it should be noted that the THS7372 would probably be better termed as a dc restoration circuit based
on how this function is performed. This circuit is an active clamp circuit and not a passive diode clamp function.
The input to the THS7372 has an internal control loop that sets the lowest input applied voltage to clamp at
ground (0 V). By setting the reference at 0 V, the THS7372 allows a dc-coupled input to also function. Therefore,
the sync-tip-clamp (STC) is considered transparent because it does not operate unless the input signal goes
below ground. The signal then goes through the same 150-mV level shifter, resulting in an output voltage low
level of 300 mV. If the input signal tries to go below 0 V, the THS7372 internal control loop sources up to 6 mA of
current to increase the input voltage level on the THS7372 input side of the coupling capacitor. As soon as the
voltage goes above the 0-V level, the loop stops sourcing current and becomes very high impedance.
One of the concerns about the sync-tip-clamp level is how the clamp reacts to a sync edge that has
overshoot
—common in VCR signals, noise, DAC overshoot, or reflections found in poor printed circuit board
(PCB) layouts. Ideally, the STC should not react to the overshoot voltage of the input signal. Otherwise, this
response could result in clipping on the rest of the video signal because it may raise the bias voltage too much.
Copyright
2011, Texas Instruments Incorporated
31
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
THS7372PWEVM 功能描述:放大器 IC 開(kāi)發(fā)工具 THS7372 EVAL MOD RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類(lèi)型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V
THS7373 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:4-Channel Video Amplifier with 1-SD and 3-HD Sixth-Order Filters and 6-dB Gain
THS7373_10 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:4-Channel Video Amplifier with 1-SD and 3-HD Sixth-Order Filters and 6-dB Gain
THS7373EVM 功能描述:放大器 IC 開(kāi)發(fā)工具 THS7373EVM Eval Mod RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類(lèi)型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V
THS7373IPW 功能描述:視頻放大器 4-Ch Video Amp 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
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