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LM321MF 데이터시트(PDF) 6 Page - Tiger Electronic Co.,Ltd

부품명 LM321MF
상세설명  Low Power Single Op Amp
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제조업체  TGS [Tiger Electronic Co.,Ltd]
홈페이지  http://www.tgselec.com
Logo TGS - Tiger Electronic Co.,Ltd

LM321MF 데이터시트(HTML) 6 Page - Tiger Electronic Co.,Ltd

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LM321MF
APPLICATION SUMMARY
The
LM321MF 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 V DC . 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 accommodated and, as input differential
voltage protection diodes are not needed, no large input currents result from large
differential 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 V DC (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 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
LM321MF establishes a supply current which is independent of the
magnitude of the power supply voltage over the range of from 3 V DC to 30 V DC .
Output short circuits either to ground or to the positive power supply should be of short
time duration. Units can be destroyed, not as a result of the short circuit current causing
6/9


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