LMV339DTBR2G Integrated Circuits (ICs)

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	General Purpose
Number of Elements:	4
Output Type:	Open Drain
Voltage - Supply, Single/Dual (±):	2.7 V ~ 5 V
Voltage - Input Offset (Max):	9mV @ 5V
Current - Input Bias (Max):	0.001µA @ 5V
Current - Output (Typ):	84mA @ 5V
Current - Quiescent (Max):	350µA
CMRR, PSRR (Typ):	--
Propagation Delay (Max):	1.5µs
Hysteresis:	--
Operating Temperature:	--
Package / Case:	14-TSSOP (0.173", 4.40mm Width)
Mounting Type:	Surface Mount
Supplier Device Package:	14-TSSOP
Base Part Number:	LMV339

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LMV339DTBR2G: Linear-Comparator Application and Working Principle

Comparators are devices which have the ability to compare two voltages and output a digital signal based on the result of the comparison. The LMV339DTBR2G is a low-voltage, low-power, rail-to-rail single supply comparator, and is part of a family of precision devices manufactured by Texas Instruments.The LMV339DTBR2G is optically isolated, so that input voltages that are sensitive to noise can be compared with a reference voltage. This device is designed to work with power supplies ranging from 1.8 to 5.5V and has an output that is directly compatible with 3.3V and 5V logic. With a low operating current of 1µA and a low-power "shutdown" mode that draws only 50nA, the LMV339DTBR2G is especially suitable for battery-powered applications.

Applications

The LMV339DTBR2G is used in a variety of applications, from consumer electronics to medical equipment. The device is most often used in applications that require programmable thresholds such as power supply monitoring, emergency shut-off activation and opto-switch switching.The device is also often used in optical sensors due to its high accuracy over a wide range of temperatures. The LMV339DTBR2G can be used to detect the presence and location of objects, and can be used in motion sensors and motion-detection alarms.

Working Principle

At the heart of the LMV339DTBR2G is a fully differential, high-precision comparator circuit. This type of comparison circuit measures the difference between two voltages and outputs a digital-logic signal based on the result of the comparison.When the input voltage exceeds the reference voltage, the circuit outputs a logic-high signal. When the input voltage is below the reference voltage, then the output is a logic-low signal. The accuracy of the circuit is due to its independent power and ground lines and its ability to keep the voltage drops across them constant.The LMV339DTBR2G can be used with a single supply power source, along with its complementary connection for sensing ground voltage. This enables the device to compare a single-ended signal to an accurate reference voltage.In addition to the comparison operation, the device also has an Enable input that can be used to put the device into a low-power "shutdown" mode. When the Enable input is high, the device is disabled and only draws 50nA. This helps to conserve power in battery-powered applications where the device may not always be in use.

Conclusion

The LMV339DTBR2G is a precision, low-voltage, low-power comparator with a single-supply operation range of 1.8 to 5.5V. It is used in a variety of applications, from consumer electronics to medical equipment, due to its high precision over a wide range of temperatures. This device has a low operating current of 1µA and a low-power "shutdown" mode that draws only 50nA, making it ideal for battery-powered applications. The device is equipped with a fully differential, high-precision comparator circuit that is used to compare an input voltage with an accurate reference voltage. The device also has an Enable input that can be used to put the device into a low-power "shutdown" mode to help conserve power.

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