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參數(shù)資料
| 型號(hào)： | LMH6645MAX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | 2.7V, 650レA, 55MHz, Rail-to-Rail Input and Output Amplifiers with Shutdown Option |
| 中文描述： | OP-AMP, 4000 uV OFFSET-MAX, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 15/19頁 |
| 文件大?。?/td> | 637K |
| 代理商： | LMH6645MAX |
Application Notes
(Continued)
During shutdown, the input stage has an equivalent circuit as
shown below in Figure 2
As can be seen above, in shutdown, there may be current
flow through the internal diodes shown, caused by input
potential, if present. This current may flow through the exter-
nal feedback resistor and result in an apparent output signal.
In most shutdown applications the presence of this output is
inconsequential. However, if the output is “forced” by another
device such as in a multiplexer, the other device will need to
conduct the current described in order to maintain the output
potential.
To keep the output at or near ground during shutdown when
there is no other device to hold the output low, a switch
(transistor) could be used to shunt the output to ground.
Figure 3shows a circuit where a NPN bipolar is used to keep
the output near ground (
～
80mV):
Figure 4 shows the output waveform.
If bipolar transistor power dissipation is not tolerable, the
switch could be by a N-channel enhancement mode MOS-
FET.
2.7V Single Supply RRIO 2:1 MUX:
The schematic show in Figure 5 will function as a 2:1 MUX
operating on a single 2.7V power supply, by utilizing the
shutdown feature of the LMH6647:
20020256
FIGURE 2. LMH6647 Equivalent Input in Shutdown
Mode
20020264
FIGURE 3. Active Pull-Down Schematic
20020236
FIGURE 4. Output Held Low by Active Pull-Down
Circuit
20020258
FIGURE 5. 2:1 MUX Operating off a 2.7V Single Supply
L
www.national.com
15
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| LMH6645MF | 2.7V, 650レA, 55MHz, Rail-to-Rail Input and Output Amplifiers with Shutdown Option |
| LMH6646MM | 2.7V, 650レA, 55MHz, Rail-to-Rail Input and Output Amplifiers with Shutdown Option |
| LMH6646MMX | 2.7V, 650レA, 55MHz, Rail-to-Rail Input and Output Amplifiers with Shutdown Option |
| LMH6647 | 2.7V, 650レA, 55MHz, Rail-to-Rail Input and Output Amplifiers with Shutdown Option |
| LMH6647MA | 2.7V, 650レA, 55MHz, Rail-to-Rail Input and Output Amplifiers with Shutdown Option |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMH6645MAX/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 |
| LMH6645MF | 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 |
| LMH6645MF/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 Sgl 2.7V 650Ua 80Mhz RRIO 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 |
| LMH6645MF/NOPB | 制造商:Texas Instruments 功能描述:Operational Amplifier (Op-Amp) IC |
| LMH6645MFX | 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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