LMV358MM National Semiconductor, LMV358MM Datasheet - Page 14

• Manufacturer Part Number: LMV358MM
• Description: IC OP AMP DUAL LOW V R-R 8-MSOP
• Manufacturer: National Semiconductor

Specifications of LMV358MM

• Amplifier Type: General Purpose
• Number Of Circuits: 2
• Output Type: Rail-to-Rail
• Slew Rate: 1 V/µs
• Gain Bandwidth Product: 1MHz
• Current - Input Bias: 15nA
• Voltage - Input Offset: 1700µV
• Current - Supply: 210µA
• Current - Output / Channel: 160mA
• Voltage - Supply, Single/dual (±): 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• -3db Bandwidth: -
• Other names: LMV358MMTR

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In
C
margin to the overall system. The desired performance de-
pends on the value of R
the more stable V
of
The circuit in
3
there were a load resistor in
voltage divided by R
ure
techniques to connect V
ing the value of R
LMV358/LMV324. C
of phase margin by feeding the high frequency component of
the output signal back to the amplifier's inverting input, there-
by preserving phase margin in the overall feedback loop.
Increased capacitive drive is possible by increasing the value
of C
FIGURE 5. Indirectly Driving A Capacitive Load with DC
L
because it provides DC accuracy as well as AC stability. If
FIGURE 4. Pulse Response of the LMV324 Circuit in
Figure 3
Figure 3
form a pole to increase stability by adding more phase
5, R
F
. This in turn will slow down the pulse response.
F
provides the DC accuracy by using feed-forward
, the isolation resistor R
using 620Ω for R
Figure 5
F
OUT
due to the input bias current of theLMV321/
ISO
F
will be.
is an improvement to the one in
and R
ISO
and the load resistor. Instead, in
IN
Accuracy
. The bigger the R
Figure 3
to R
ISO
ISO
Figure 4
Figure
L
. Caution is needed in choos-
and 510 pF for C
serve to counteract the loss
ISO
3, the output would be
and the load capacitor
is an output waveform
ISO
10006005
resistor value,
L.
10006099
.
Figure
Fig-
14
INPUT BIAS CURRENT CANCELLATION
The LMV321/LMV358/LMV324 family has a bipolar input
stage. The typical input bias current of LMV321/LMV358/
LMV324 is 15 nA with 5V supply. Thus a 100 kΩ input resistor
will cause 1.5 mV of error voltage. By balancing the resistor
values at both inverting and non-inverting inputs, the error
caused by the amplifier's input bias current will be reduced.
The circuit in
by input bias current.
TYPICAL SINGLE-SUPPLY APPLICATION CIRCUITS
Difference Amplifier
The difference amplifier allows the subtraction of two voltages
or, as a special case, the cancellation of a signal common to
two inputs. It is useful as a computational amplifier, in making
a differential to single-ended conversion or in rejecting a com-
mon mode signal.
FIGURE 6. Cancelling the Error Caused by Input Bias
Figure 6
FIGURE 7. Difference Amplifier
shows how to cancel the error caused
Current
10006006
10006007
10006019