Current - Output (Typ):	20mA
Base Part Number:	LM2903
Supplier Device Package:	8-SOIC
Mounting Type:	Surface Mount
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 125°C
Hysteresis:	--
Propagation Delay (Max):	--
CMRR, PSRR (Typ):	--
Current - Quiescent (Max):	2.5mA
Series:	--
Current - Input Bias (Max):	0.25µA @ 5V
Voltage - Input Offset (Max):	7mV @ 30V
Voltage - Supply, Single/Dual (±):	2 V ~ 36 V, ±1 V ~ 18 V
Output Type:	CMOS, MOS, Open-Drain, TTL
Number of Elements:	2
Type:	Differential
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The LM2903DRE4 is a low-power, dual operational amplifier and is part of the Linear-Comparators family of products. It is used in many applications and can be used in a variety of applications from analog signal processing to digital audio. The LM2903DRE4, along with its cousins the LM2903 and the LM2903D, are registered trademarks of National Semiconductor Corp. and have been developed by the National Semiconductor’s Advanced Analog Design Team.

The Working Principle

The LM2903DRE4 operates through a principle known as differential-input operation. In other words, the signal being amplified or processed is split in two and each half is analyzed using different references. The aim of doing this is to reduce the noise that can creep in to the signal path. The differential-input amplifier uses two different types of input voltage sources, the (+) and (-) supply. The (+) supply is used to produce a signal to be amplified at the input and the (-) supply is used to provide a reference level for the input signal. The (+) supply is usually supplied with a variable voltage, typically from 1 to 10V and the (-) supply is usually supplied with a fixed voltage of 0.5V or 2.5V.The output of the LM2903DRE4 is a combination of the two inputs, it is a negative voltage if the (-) input is larger than the (+) input and is a positive voltage if the (+) input is larger than the (-) input. The size of the output volts is controlled by the gain of the amplifier, the larger the voltage difference between the two inputs, the larger the output voltage. The LM2903DRE4 typically has an open-loop gain (gain with no feedback applied) of 100000, the highest industry standard. The LM2903DRE4 has two additional pins, one is the reverse bias voltage source and the other is the hysteresis control pin. The reverse bias voltage is used to control the leakage currents of the input transistors and also to reduce the gain of the amplifier at lower input voltages. The hysteresis control is used to control the ‘dead zone’ of the circuit, the dead zone is the region where the output does not reverse even though the inputs have reversed. This can be used for controlling the edges of a digital signal. It is very common for the LM2903DRE4 to be used in digital signal processing circuits and it is this application that makes it so versatile.

Applications

The LM2903DRE4 is used in many applications, ranging from medical equipment to home electronic appliances. The low power requirement and high open-loop gain make it ideal for use in battery-powered applications. In medical applications the LM2903DRE4 is used predominantly in EEG and EKG. The low-power and superb noise-rejection properties allow it to accurately monitor the heart rate, blood pressure and other bodily functions with extremely minimal power requirements.The precision levels of the LM2903DRE4 make it suitable for instrumentation applications, such as data acquisition systems. It is often used to provide a direct interface to an analog or digital transducer. The high open-loop gain and low power usage also make it useful in metering and control applications. Home entertainment applications are also heavily dependent on the LM2903DRE4 for audio processing and voltage monitoring. Many CD and DVD players incorporate the LM2903DRE4 into their design and its noise-canceling properties make it ideal for producing high quality audio signals. Furthermore, the LM2903DRE4 is also used in manufacturing, automotive, aerospace and consumer electronics. The versatility of the LM2903DRE4 makes it suitable for use in a wide range of industries, from consumer products to industrial applications.

Conclusion

The LM2903DRE4 is a low-power dual operational amplifier and is part of the Linear-Comparators family of products. Its differential-input operation and high open-loop gain make it ideal for use in many applications, from medical equipment to home electronics. Furthermore, its low power requirements and superb noise-rejection properties make it ideal for use in applications such as data acquisition and audio processing. The LM2903DRE4 can be used in a variety of industries, including medical, automotive, aerospace and consumer electronics.

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