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參數(shù)資料
| 型號： | LMC6442IM |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | Dual Micropower Rail-to-Rail Output Single Supply Operational Amplifier |
| 中文描述： | DUAL OP-AMP, 8000 uV OFFSET-MAX, 0.0095 MHz BAND WIDTH, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SOIC-8 |
| 文件頁數(shù)： | 10/15頁 |
| 文件大?。?/td> | 553K |
| 代理商： | LMC6442IM |
Typical Performance Characteristics
V
S
= 5V, Single Supply, T
A
= 25C unless otherwise
specified (Continued)
Application Notes
Using LMC6442 in unity gain applications:
LMC6442 is
optimized for maximum bandwidth and minimal external
components when operating at a minimum closed loop gain
of +2 (or 1). However, it is also possible to operate the de-
vice in a unity gain configuration by adding external compen-
sation as shown in Figure 1:
Using this compensation technique it is possible to drive ca-
pacitive loads of up to 300 pF without causing oscillations
(see the Typical Performance Characteristics for step re-
sponse plots). This compensation can also be used with
other gain settings in order to improve stability, especially
when driving capacitive loads (for optimum performance, R
c
and C
c
may need to be adjusted).
Using “T” Network:
Compromises need to be made whenever high gain invert-
ing stages need to achieve a high input impedance as well.
This is especially important in low current applications which
tend to deal with high resistance values. Using a traditional
inverting amplifier, gain is inversely proportional to the resis-
tor value tied between the inverting terminal and input while
the input impedance is equal to this value. For example, in
order to build an inverting amplifier with an input impedance
of 10M
and a gain of 100, one needs to come up with a
feedback resistor of 1000M
-an expensive task.
An alternate solution is to use a “T” Network in the feedback
path, as shown in Fig. 2.
Closed loop gain, A
V
is given by:
It must be noted, however, that using this scheme, the real-
izable bandwidth would be less than the theoretical maxi-
mum. With feedback factor,
β
, defined as:
BW(3 dB)
≈
GBWP
β
In this case, assuming a GBWP of about 10 KHz, the ex-
pected BW would be around 50 Hz (vs 100 Hz with the con-
ventional inverting amplifier).
Looking at the problem from a different view, with R
defined
by A
Rin, one could select a value for R in the “T” Network
and then determine R1 based on this selection:
Large Signal Step
Response
(A
V
= +1) (C
L
= 200pF)
DS100064-32
DS100064-35
FIGURE 1. A
V
= +1 Operation by adding C
c
and R
c
DS100064-36
FIGURE 2. “T” Network Used to Replace High Value
Resistor
DS100064-22
FIGURE 3. “T” Network Values for Various Values of R
www.national.com
10
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| LMC6442IM/NOPB | 功能描述:運算放大器 - 運放 Dual Micropower RRO Single Supply Op 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 |
| LMC6442IMM | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual Micropower Rail-to-Rail Output Single Supply Operational Amplifier |
| LMC6442IMMX | 制造商:Texas Instruments 功能描述: |
| LMC6442IMX | 功能描述:運算放大器 - 運放 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 |
| LMC6442IMX/NOPB | 功能描述:運算放大器 - 運放 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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