Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

LMC6042AIM Datasheet(PDF) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LMC6042AIM
Description  CMOS Dual Micropower Operational Amplifier
Download  13 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMC6042AIM Datasheet(HTML) 7 Page - National Semiconductor (TI)

Back Button LMC6042AIM Datasheet HTML 3Page - National Semiconductor (TI) LMC6042AIM Datasheet HTML 4Page - National Semiconductor (TI) LMC6042AIM Datasheet HTML 5Page - National Semiconductor (TI) LMC6042AIM Datasheet HTML 6Page - National Semiconductor (TI) LMC6042AIM Datasheet HTML 7Page - National Semiconductor (TI) LMC6042AIM Datasheet HTML 8Page - National Semiconductor (TI) LMC6042AIM Datasheet HTML 9Page - National Semiconductor (TI) LMC6042AIM Datasheet HTML 10Page - National Semiconductor (TI) LMC6042AIM Datasheet HTML 11Page - National Semiconductor (TI) Next Button
Zoom Inzoom in Zoom Outzoom out
 7 / 13 page
background image
Typical Performance Characteristics V
S = ±7.5V, TA = 25˚C unless otherwise specified (Continued)
Applications Hints
AMPLIFIER TOPOLOGY
The LMC6042 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 LMC6042
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 curent, like the
LMC6042.
Although the LMC6042 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
LMC6042 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. Place a capacitor, C
f, around the feed-
back resistor (as in
Figure 1 ) such that:
or
R1 C
IN ≤ R2 Cf
Since it is often difficult to know the exact value of C
IN,Cf 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.
In the circuit of
Figure 2, R1 and C1 serve to counteract the
loss of phase margin by feeding the high frequency compo-
Stability vs Capacitive Load
DS011137-43
Stability vs Capacitive Load
DS011137-44
DS011137-5
FIGURE 1. Cancelling the Effect of Input Capacitance
DS011137-6
FIGURE 2. LMC6042 Noninverting Gain of 10 Amplifier,
Compensated to Handle Capacitive Loads
www.national.com
7


Similar Part No. - LMC6042AIM

ManufacturerPart #DatasheetDescription
logo
Texas Instruments
LMC6042AIM TI-LMC6042AIM Datasheet
1Mb / 24P
[Old version datasheet]   LMC6042 CMOS Dual Micropower Operational Amplifier
LMC6042AIM TI1-LMC6042AIM Datasheet
1Mb / 24P
[Old version datasheet]   CMOS Dual Micropower Operational Amplifier
LMC6042AIM TI1-LMC6042AIM Datasheet
1Mb / 24P
[Old version datasheet]   CMOS Dual Micropower Operational Amplifier
LMC6042AIM/NOPB TI1-LMC6042AIM/NOPB Datasheet
1Mb / 24P
[Old version datasheet]   CMOS Dual Micropower Operational Amplifier
LMC6042AIM/NOPB TI1-LMC6042AIM/NOPB Datasheet
1Mb / 24P
[Old version datasheet]   CMOS Dual Micropower Operational Amplifier
More results

Similar Description - LMC6042AIM

ManufacturerPart #DatasheetDescription
logo
Texas Instruments
LMC6042 TI1-LMC6042_17 Datasheet
1Mb / 24P
[Old version datasheet]   CMOS Dual Micropower Operational Amplifier
LMC6042 TI1-LMC6042 Datasheet
1Mb / 24P
[Old version datasheet]   CMOS Dual Micropower Operational Amplifier
logo
National Semiconductor ...
LMC6062 NSC-LMC6062 Datasheet
321Kb / 12P
   Precision CMOS Dual Micropower Operational Amplifier
logo
Texas Instruments
LMC6042AIMX TI1-LMC6042AIMX Datasheet
1Mb / 24P
[Old version datasheet]   LMC6042 CMOS Dual Micropower Operational Amplifier
logo
Advanced Linear Devices
ALD2721 ALD-ALD2721_11 Datasheet
111Kb / 13P
   DUAL EPAD짰 MICROPOWER CMOS OPERATIONAL AMPLIFIER
logo
Texas Instruments
LMC6042IMX TI-LMC6042IMX Datasheet
1Mb / 24P
[Old version datasheet]   LMC6042 CMOS Dual Micropower Operational Amplifier
logo
Advanced Linear Devices
ALD2731A ALD-ALD2731A Datasheet
92Kb / 9P
   PRECISION DUAL MICROPOWER CMOS OPERATIONAL AMPLIFIER
logo
Texas Instruments
LMC6062IM-NOPB TI1-LMC6062IM-NOPB Datasheet
1Mb / 21P
[Old version datasheet]   LMC6062 Precision CMOS Dual Micropower Operational Amplifier
logo
Advanced Linear Devices
ALD2736A ALD-ALD2736A Datasheet
92Kb / 9P
   PRECISION DUAL ULTRA MICROPOWER CMOS OPERATIONAL AMPLIFIER
logo
Texas Instruments
LMC6062 TI1-LMC6062 Datasheet
1Mb / 21P
[Old version datasheet]   LMC6062 Precision CMOS Dual Micropower Operational Amplifier
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.NET
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com