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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： | 17/60页 |
| 文件大小： | 1980K |
| 代理商： | THS7303PW |
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Input
Pin
Input
Internal
Circuitry
VS+
SLOS479B
– OCTOBER 2005 – REVISED MARCH 2011
INPUT MODES OF OPERATION: DC
The inputs to the THS7303 allows for both ac-coupled and dc-coupled inputs. Many DACs or video encoders can
be dc-connected to the THS7303. However, one of the drawbacks to dc coupling is when 0 V is applied to the
input of the THS7303. Although the input of the THS7303 allows for a 0-V input signal, the output swing of the
THS7303 cannot yield a 0-V signal. This applies to any traditional single-supply amplifier because of the
limitations of the output transistors. Both CMOS and bipolar transistors cannot go to 0 V while sinking a
significant amount of current. This trait of a transistor is also the same reason why the highest output voltage is
always less than the power-supply voltage when sourcing a significant amount of current.
The internal gain is fixed at 6 dB (2 V/V) regardless of the configuration of the THS7303, and dictates what the
allowable linear input voltage range is without clipping concerns. For example, if the power supply is set to 3 V,
the maximum output is about 2.9 V. Thus, to avoid clipping, the allowable input is 2.9 V / 2 = 1.45 V. This is true
for up to the maximum recommended 5-V power supply that allows about a 4.9 V / 2 = 2.45 V input range while
avoiding clipping on the output.
The input impedance of the THS7303 in this mode of operation is
> 1 M. This is a result of the input buffer
being configured as a unity gain amplifier, as shown in Figure 60.
Figure 60. Equivalent DC Input Mode Circuit
The input stage of the THS7303 is designed with PNP bipolar transistors. There is a finite amount of bias current
flowing out of the THS7303 input pin. This bias current (typically about 0.6
μA), must have a path to flow or else
the input stage voltage increases. For example, if there is a 1-M
resistance to ground on the input node, the
resulting voltage appearing at the input node is 0.6
μA x 1 M = 0.6 V. Therefore, it should be noted that if a
channel is powered on and has no input termination, the input bias current causes the input stage to float high
until saturation of the input stage exists, approximately 1.4 V from the power supply. Typically, this is not a
concern because most terminations result in an equivalent source impedance of 37.5
to 300 .
24
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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