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PDF LM321 Data sheet ( Hoja de datos )

Número de pieza LM321
Descripción Low Power Single Op Amp
Fabricantes National Semiconductor 
Logotipo National Semiconductor Logotipo



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April 2001
LM321
Low Power Single Op Amp
General Description
The LM321 brings performance and economy to low power
systems. With a high unity gain frequency and a guaranteed
0.4V/µs slew rate, the quiescent current is only
430µA/amplifier (5V). The input common mode range in-
cludes ground and therefore the device is able to operate in
single supply applications as well as in dual supply applica-
tions. It is also capable of comfortably driving large capaci-
tive loads.
The LM321 is available in the SOT23-5 package. Overall the
LM321 is a low power, wide supply range performance op
amp that can be designed into a wide range of applications
at an economical price without sacrificing valuable board
space.
Features
(VCC = 5V, TA = 25˚C. Typical values unless specified).
n Gain-Bandwidth product
1MHz
n Low supply current
430µA
n Low input bias current
45nA
n Wide supply voltage range
+3V to +32V
n Stable with high capacitive loads
n Single version of LM324
Applications
n Chargers
n Power supplies
n Industrial: controls, instruments
n Desktops
n Communications infrastructure
Connection Diagram
SOT23-5
Application Circuit
DC Summing Amplifier
(VIN’s 0 VDC and VO VDC)
Top View
20007601
Ordering Information
Package
5-Pin SOT-23
Part Number
LM321MF
LM321MFX
20007607
Where: V0 = V1 + V2 - V3 - V4, (V1+ V2) (V3 + V4) to keep VO > 0 VDC
Package Marking
A63A
Transport Media
1k Units Tape and Reel
3k Units Tape and Reel
NSC Drawing
MF05A
© 2001 National Semiconductor Corporation DS200076
www.national.com

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LM321 pdf
Application Hints
The LM321 op amp can operate with a single or dual power
supply voltage, has true-differential inputs, and remain in the
linear mode with an input common-mode voltage of 0 VDC.
This amplifier operates over a wide range of power supply
voltages, with little change in performance characteristics. At
25˚C amplifier operation is possible down to a minimum
supply voltage of 3V.
Large differential input voltages can be easily accommo-
dated and, as input differential voltage protection diodes are
not needed, no large input currents result from large differ-
ential input voltages. The differential input voltage may be
larger than V+ without damaging the device. Protection
should be provided to prevent the input voltages from going
negative more than −0.3 VDC (at 25˚C). An input clamp diode
with a resistor to the IC input terminal can be used.
To reduce the power supply drain, the amplifier has a class A
output stage for small signal levels which converts to class B
in a large signal mode. This allows the amplifiers to both
source and sink large output currents. Therefore both NPN
and PNP external current boost transistors can be used to
extend the power capability of the basic amplifiers. The
output voltage needs to raise approximately 1 diode drop
above ground to bias the on-chip vertical PNP transistor for
output current sinking applications.
For AC applications, where the load is capacitively coupled
to the output of the amplifier, a resistor should be used, from
the output of the amplifier to ground to increase the class A
bias current and to reduce distortion.
Capacitive loads which are applied directly to the output of
the amplifier reduce the loop stability margin. Values of 50pF
Typical Applications
can be accommodated using the worst-case non-inverting
unity gain connection. Large closed loop gains or resistive
isolation should be used if large load capacitance must be
driven by the amplifier.
The bias network of the LM321 establishes a supply current
which is independent of the magnitude of the power supply
voltage over the range of from 3 VDC to 30 VDC.
Output short circuits either to ground or to the positive power
supply should be of short time duration. Units can be de-
stroyed, not as a result of the short circuit current causing
metal fusing, but rather due to the large increase in IC chip
dissipation which will cause eventual failure due to exces-
sive junction temperatures. The larger value of output source
current which is available at 25˚C provides a larger output
current capability at elevated temperatures than a standard
IC op amp.
The circuits presented in the section on typical applications
emphasize operation on only a single power supply voltage.
If complementary power supplies are available, all of the
standard op amp circuits can be used. In general, introduc-
ing a pseudo-ground (a bias voltage reference of V+/2) will
allow operation above and below this value in single power
supply systems. Many application circuits are shown which
take advantage of the wide input common-mode voltage
range which includes ground. In most cases, input biasing is
not required and input voltages which range to ground can
easily be accommodated.
Non-Inverting DC Gain (0V Input = 0V Output)
20007606
5 www.national.com

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