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參數(shù)資料
| 型號(hào)： | LM6041IN |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運(yùn)算放大器 |
| 英文描述： | CONNECTOR |
| 中文描述： | OP-AMP, 6300 uV OFFSET-MAX, 0.075 MHz BAND WIDTH, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 381K |
| 代理商： | LM6041IN |
Typical Performance Characteristics
V
S
=
±
7.5V, T
A
= 25C unless otherwise
specified (Continued)
Applications Hints
AMPLIFIER TOPOLOGY
The LMC6041 incorporates a novel op-amp design topology
that enables it to maintain rail-to-rail output swing even when
driving a large load. Instead of relying on a push-pull unity
gain output buffer stage, the output stage is taken directly
from the internal integrator, which provides both low output
impedance and large gain. Special feed-forward compensa-
tion design techniques are incorporated to maintain stability
over a wider range of operating conditions than traditional
micropower op-amps. These features make the LMC6041
both easier to design with, and provide higher speed than
products typically found in this ultra-low power class.
COMPENSATING FOR INPUT CAPACITANCE
It is quite common to use large values of feedback resis-
tance with amplifiers with ultra-low input current, like the
LMC6041.
Although the LMC6041 is highly stable over a wide range of
operating conditions, certain precautions must be met to
achieve the desired pulse response when a large feedback
resistor is used. Large feedback resistors and even small
values of input capacitance, due to transducers, photo-
diodes, and circuits board parasitics, reduce phase margins.
When high input impedance are demanded, guarding of the
LMC6041 is suggested. Guarding input lines will not only re-
duce leakage, but lowers stray input capacitance as well.
(See
Printed-Circuit-Board Layout for High Impedance
Work
.)
The effect of input capacitance can be compensated for by
adding a capacitor. Adding a capacitor, C
f
, around the feed-
back resistor (as in Figure 1 ) such that:
or
R
1
C
IN
≤
R
2
C
f
Since it is often difficult to know the exact value of C
, C
can
be experimentally adjusted so that the desired pulse re-
sponse is achieved. Refer to the LMC660 and the LMC662
for a more detailed discussion on compensating for input ca-
pacitance.
CAPACITIVE LOAD TOLERANCE
Direct capacitive loading will reduce the phase margin of
many op-amps. A pole in the feedback loop is created by the
combination of the op-amp’s output impedance and the ca-
pacitive load. This pole induces phase lag at the unity-gain
crossover frequency of the amplifier resulting in either an os-
cillatory or underdamped pulse response. With a few exter-
nal components, op amps can easily indirectly drive capaci-
tive loads, as shown in Figure 2
Stability vs
Capacitive Load
(A
V
=
±
10)
DS011136-43
DS011136-5
FIGURE 1. Cancelling the Effect of Input Capacitance
www.national.com
7
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LMC6041 | CMOS Single Micropower Operational Amplifier |
| LMC6041AIM | CMOS Single Micropower Operational Amplifier |
| LMC6041AIN | CMOS Single Micropower Operational Amplifier |
| LMC6041IM | CMOS Single Micropower Operational Amplifier |
| LM604 | 4 CHANNEL MUX-AMP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM604ACM | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LM604ACN | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:4 CHANNEL MUX-AMP |
| LM604AMJ | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:4 CHANNEL MUX-AMP |
| LM604AMJ-MIL | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
| LM604CM | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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