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參數(shù)資料
| 型號： | LMC6584AIN |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | Low Voltage, Rail-To-Rail Input and Output CMOS Operational Amplifier |
| 中文描述： | QUAD OP-AMP, 1000 uV OFFSET-MAX, 1.2 MHz BAND WIDTH, PDIP14 |
| 封裝： | PLASTIC, DIP-14 |
| 文件頁數(shù)： | 13/19頁 |
| 文件大?。?/td> | 678K |
| 代理商： | LMC6584AIN |
5.0 Printed-Circuit-Board Layout
for High-Impedance Work
(Continued)
The designer should be aware that when it is inappropriate
to lay out a PC board for the sake of just a few circuits, there
is another technique which is even better than a guard ring
on a PC board: Don’t insert the amplifier’s input pin into the
board at all, but bend it up in the air and use only air as an in-
sulator. Air is an excellent insulator. In this case you may
have to forego some of the advantages of PC board con-
struction, but the advantages are sometimes well worth the
effort of using point-to-point up-in-the-air wiring. See Figure
13
6.0 Compensating for Input
Capacitance
It is quite common to use large values of feedback resis-
tance with amplifiers that have ultra-low input current, like
the LMC6582/4. Large feedback resistors can react with
small values of input capacitance due to transducers, photo-
diodes, and circuits board parasitics to reduce phase
margins.
The effect of input capacitance can be compensated for by
adding a feedback capacitor. The feedback capacitor (as in
Figure 14), C
F
, is first estimated by:
or
R
1
C
IN
≤
R
2
C
F
which typically provides significant overcompensation.
Printed circuit board stray capacitance may be larger or
smaller than that of a breadboard, so the actual optimum
value for C
may be different. The values of C
should be
checked on the actual circuit. (Refer to the LMC660 quad
CMOS amplifier data sheet for a more detailed discussion.)
7.0 Spice Macromodel
A Spice Macromodel is available for the LMC6582/4. The
model includes a simulation of:
Input common-mode voltage range
Frequency and transient response
GBW dependence on loading conditions
Quiescent and dynamic supply current
Output swing dependence on loading conditions
and many more characteristics as listed on the macromodel
disk.
Contact the National Semiconductor Customer Response
Center at 1-800-272-9959 to obtain an operational amplifier
spice model library disk.
DS012041-15
Inverting Amplifier
DS012041-16
Non-Inverting Amplifier
DS012041-17
Follower
FIGURE 12. Typical Connections of Guard Rings
DS012041-18
FIGURE 13. Air Wiring
DS012041-13
FIGURE 14. Canceling the Effect of Input Capacitance
www.national.com
13
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LMC6584BIM | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low Voltage, Rail-To-Rail Input and Output CMOS Operational Amplifier |
| LMC6584BIMX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low Voltage, Rail-To-Rail Input and Output CMOS Operational Amplifier |
| LMC6584BIN | 功能描述:IC OP AMP QUAD LO VOLT R-R 14DIP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:1,000 系列:- 放大器類型:電壓反饋 電路數(shù):4 輸出類型:滿擺幅 轉換速率:33 V/µs 增益帶寬積:20MHz -3db帶寬:30MHz 電流 - 輸入偏壓:2nA 電壓 - 輸入偏移:3000µV 電流 - 電源:2.5mA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:14-SOIC 包裝:帶卷 (TR) |
| LMC66 | 制造商:Texas Instruments 功能描述: |
| LMC660 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:CMOS Quad Operational Amplifier |
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