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參數(shù)資料
| 型號： | LMH6720MA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Wideband Video Op Amp; Single, Single with Shutdown and Quad |
| 中文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 11/15頁 |
| 文件大?。?/td> | 597K |
| 代理商： | LMH6720MA |
Application Section
(Continued)
WIDE BAND DIGITAL PROGRAMMABLE GAIN AMPLIFIER (LMH6720 ONLY)
As shown in
Figure 6
and
Figure 7
the LMH6720 can be
used to construct a digitally controlled programmable gain
amplifier. Each amplifier is configured to provide a digitally
selectable gain. To provide for accurate gain settings, 1% or
better tolerance is recommended on the feedback and gain
resistors. The gain provided by each digital code is arbitrary
through selection of the feedback and gain resistor values.
AMPLITUDE EQUALIZATION
Sending signals over coaxial cable greater than 50 meters in
length will attenuate high frequency signal components
much more than lower frequency components. An equalizer
can be made to pre emphasize the higher frequency com-
ponents so that the final signal has less distortion. This
process can be done at either end of the cable. The circuit in
Figure 8
shows a receiver with some additional components
in the feedback loop to equalize the incoming signal. The RC
networks peak the signal at higher frequencies. This peaking
is a piecewise linear approximation of the inverse of the
frequency response of the coaxial cable.
Figure 9
shows the
effect of this equalization on a digital signal that has passed
through 150 meters of coaxial cable.
Figure 10
shows a
Bode plot of the frequency response of the circuit in
Figure 8
along with equations needed to design the pole and zero
frequencies.
Figure 11
shows a network analyzer plot of an
LMH6714/6720/6722 with the following component values:
R
G
= 309
R1 = 450
C1 = 470pF
R2 = 91
C2 = 68pF
20056519
FIGURE 6. Wideband Digitally Controlled Programmable Gain Amplifier
Channel Switching
20056520
FIGURE 7. PGA Output
L
www.national.com
11
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMH6720MA/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 Sgl 600Mhz Video Amp RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMH6720MAX | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMH6720MAX/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMH6720MF | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMH6720MF/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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