LM393AP

Type:	Differential
Number of Elements:	2
Output Type:	CMOS, MOS, Open-Drain, TTL
Voltage - Supply, Single/Dual (±):	2 V ~ 36 V, ±1 V ~ 18 V
Voltage - Input Offset (Max):	2mV @ 30V
Current - Input Bias (Max):	0.25µA @ 5V
Current - Output (Typ):	20mA
Current - Quiescent (Max):	2.5mA
CMRR, PSRR (Typ):	--
Propagation Delay (Max):	--
Hysteresis:	--
Operating Temperature:	0°C ~ 70°C
Package / Case:	8-DIP (0.300", 7.62mm)
Mounting Type:	Through Hole
Supplier Device Package:	8-PDIP
Base Part Number:	LM393A
Series:	--
Packaging:	Tube
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--

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Introduction

The LM393AP is an integrated circuit made by Texas Instruments, and it belongs to a higher category of linear comparators. A linear comparator is an electrical component that receives two input signals, compares them and outputs a single signal that\'s proportional to the magnitude of these inputs. This is a logical function that can be used in a variety of applications, such as timing, event control, signal conditioning and protection circuitry. The LM393AP is well-suited for such applications with its operational amplifiers, open drain configuration, wide supply voltage range, and low quiescent current draw.

Application Fields

The LM393AP is used in many applications where high speed and precision comparisons of digital signals are necessary. It is often found in pulse-width modulation circuit implementations, and can also be used in power supply sequencing and monitoring circuits. Optoelectronic detectors that make use of light-receiving transistors often also use the LM393AP for high-precision signal conditioning. Some of the more complex uses of the LM393AP include amplitude and phase comparators, as well as pulse width modulation signal applications. PWM signal applications commonly use the LM393AP in conjunction with voltage and current limiters, and for noise supervision in AC/DC power stages.

Working Principle

The LM393AP includes two separate op-amps, each with independent (+/-) inputs, along with an open drain output configuration. When the inputs of one op-amp are greater than the inputs of the other, the output will be an active low, while when they are equal to each other, the output will be an active high. In more complex implementations, the LM393AP can be used as a frequency-to-voltage converter. In this case, the frequencies of two oscillating sinusoids are compared, and the resulting analog voltage signal is proportional to the difference in their frequencies. This is done by configuring the op-amps to measure the peak of each of the two sinusoids, and then subtract the output of one from the output of the other.

Conclusion

The LM393AP is a versatile component that can be used in a wide range of linear comparator applications. Its wide supply voltage range, low quiescent current draw, and open drain configuration make it an ideal component for high speed and precision comparisons of digital signals. It can be used for amplitude and phase comparators, pulse width modulation signals, power supply sequencing and monitoring circuits, and frequency-to-voltage converters. In the hands of an experienced engineer, the LM393AP can be an effective tool for satisfying the needs of a wide range of projects.

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