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參數(shù)資料
| 型號(hào)： | LMC6084lM |
| 廠商： | National Semiconductor Corporation |
| 元件分類(lèi)： | 運(yùn)算放大器 |
| 英文描述： | Precision CMOS Quad Operational Amplifier |
| 中文描述： | 精密的CMOS四路運(yùn)算放大器 |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大小： | 278K |
| 代理商： | LMC6084LM |
Typical Performance Characteristics
(Continued)
Applications Hints
AMPLIFIER TOPOLOGY
The LMC6084 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 LMC6084
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 for amplifiers with ultra-low input current, like the
LMC6084.
Although the LMC6084 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 circuit board parasitics, reduce phase margins.
When high input impedances are demanded, guarding of the
LMC6084 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, C
f
, around the feedback resistors (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 LMC662 for a
more
detailed
discussion
on
capacitance.
compensating
for
input
Non-Inverting Large
Signal Pulse Response
DS011467-35
Crosstalk Rejection
vs Frequency
DS011467-36
Stability vs Capacitive
Load, R
L
= 600
DS011467-37
Stability vs Capacitive
Load R
L
= 1 M
DS011467-38
DS011467-4
FIGURE 1. Cancelling the Effect of Input Capacitance
www.national.com
7
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相關(guān)代理商/技術(shù)參數(shù) |
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| LMC6084LN | 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Precision CMOS Quad Operational Amplifier |
| LMC610CSC | 制造商:BLACK BOX 功能描述:SNMP MANAGEABLE MODULE |
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