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參數資料
| 型號： | LMC6082 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 運動控制電子 |
| 英文描述： | Precision CMOS Dual Operational Amplifier |
| 中文描述： | 精密CMOS雙運算放大器 |
| 文件頁數： | 7/12頁 |
| 文件大?。?/td> | 322K |
| 代理商： | LMC6082 |
Typical Performance Characteristics
specified (Continued)
V
S
=
±
7.5V, T
A
= 25C, Unless otherwise
Applications Hints
AMPLIFIER TOPOLOGY
The LMC6082 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 LMC6082
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
LMC6082.
Although the LMC6082 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
LMC6082 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
DS011297-33
Crosstalk Rejection
vs Frequency
DS011297-34
Stability vs Capacitive
Load, R
L
= 600
DS011297-35
Stability vs Capacitive
Load R
L
= 1 M
DS011297-36
www.national.com
7
相關PDF資料 |
PDF描述 |
|---|---|
| LMC6082AIM | Precision CMOS Dual Operational Amplifier |
| LMC6082AIN | Precision CMOS Dual Operational Amplifier |
| LMC6082AMN | Precision CMOS Dual Operational Amplifier |
| LMC6082IM | Precision CMOS Dual Operational Amplifier |
| LMC6082IN | Precision CMOS Dual Operational Amplifier |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LMC6082 WAF | 制造商:Texas Instruments 功能描述: |
| LMC6082AIM | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數量: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 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMC6082AIM | 制造商:Texas Instruments 功能描述:OP AMP DUAL CMOS SMD 6082 SOIC8 |
| LMC6082AIM/NOPB | 功能描述:運算放大器 - 運放 PRECISION CMOS DUAL OP AMP RoHS:否 制造商:STMicroelectronics 通道數量: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 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMC6082AIM/NOPB | 制造商:Texas Instruments 功能描述:Operational Amplifier (Op-Amp) IC |
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