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| 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： | 19/60页 |
| 文件大小： | 1980K |
| 代理商： | THS7303PW |
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InputPin
Input
Rpd
(SeeNote A)
Rpu
(SeeNote A)
75kW
25kW
CI
Internal
Circuitry
VS+
SLOS479B
– OCTOBER 2005 – REVISED MARCH 2011
INPUT MODES OF OPERATION: AC BIAS
Other applications require an ac-coupled input. The ac-coupling ensures that a source dc-input bias level does
not alter, or clip, the resulting output video signal. The first ac-coupling mode is the AC Bias mode, where a
simple internal dc bias voltage is applied to the input signal on the THS7303-side of the external coupling
capacitor.
The applied dc bias voltage is set internally by a simple resistor divider circuit, as shown in Figure 62. The dc
bias voltage is set to VS+ / 4. With a 3.3-V power supply, the input bias voltage is nominally 0.825 V; with 5-V
supply, the input bias voltage is nominally 1.25 V. The input impedance with this mode is approximately 19-k
.
With a 1-
μF input capacitor, it sets a high-pass corner frequency of about 9 Hz. If a lower frequency is desired,
increasing the capacitor decreases the corner frequency proportionally. For example, using a 4.7-
μF capacitor
results in a 1.8-Hz high-pass corner frequency, and results in lower droop (tilt). Using any capacitor value is
acceptable for this mode of operation.
A.
Use external pull-up and/or pull-down resistors if changing the ac-bias input voltage is desired.
Figure 62. Equivalent AC Bias Input Mode Circuit
It is sometimes desirable to adjust the bias voltage to another level other than the one dictated by the internal
resistors. There are two ways this adjustment is accomplished:
1. The first method is to add an external resistor between the input pin and either the VS+ or GND. This creates
a new bias voltage equal to VS+× [25 k / {25 k + (75 k || RPU)}] for raising the bias voltage, or VS+ × [(25 k ||
RPD) / {(25 k || RPD) + 75 k}] for reducing the bias voltage.
2. The second method to set the ac bias voltage is to use the RPU and RPD external resistors, but place the
THS7303 in dc input bias mode. Because the dc mode is very high impedance, the resulting bias voltage is
equal to approximately VS+ × (RPD / {RPD + RPU}). Due to the input bias current, there will be a difference
between the true dc bias voltage and the theoretical bias voltage.
This mode of operation is recommended for use with chroma (C
’), P’B, P’R, U’, V’, and other non-sync signals.
26
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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