TSOP77438TR Sensors, Transducers

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Sensing Distance:	40m
B.P.F. Center Frequency:	38.0kHz
Voltage - Supply:	2.5V ~ 5.5V
Current - Supply:	700µA
Orientation:	Side or Top View
Mounting Type:	Surface Mount
Operating Temperature:	-25°C ~ 85°C (TA)

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The TSOP77438TR is an optical remote receiver designed primarily to detect the intensity of infrared (IR) signals emitted by IR remote controls. It is part of a vast spectrum of values of remote receivers used for IR detection applications. The understanding of both its application fields and its working principles are critical when designing projects in this area.

Application Field

The TSOP77438TR is an integrated TSOP remote receiver designed specifically for modulated IR signals used by 38kHz and 40kHz remote control systems. TSOP receivers are widely used in consumer remote control applications such as TV and DVD player remote control systems, projectors and VCRs. These remote control systems typically consist of an IR LED transmitter and a TSOP receiver. The IR LED transmits a modulated IR signal that represents a specific command, typically one of the buttons on the remote control. The TSOP receiver detects the modulated IR signal and, depending on its design, can decode the data from the signal.The TSOP77438TR is an omni-directional receiver, meaning that it can receive signals from multiple directions. This allows the remote control system to operate more reliably in a wide range of orientations, making it ideal for consumer applications.

Working Principle

The working principle of the TSOP77438TR is based on a photodiode array. A photodiode array is an array of photodiodes, which are semiconductor devices that employ the photoelectric effect to convert light into electric current. In this case, the photodiode array is designed to detect 38kHz and 40kHz signals transmitted by IR LED transmitters.The photodiodes in the TSOP’s array are connected in two sets of 8 diodes. One set is connected to an internal amplifier, which amplifies the voltage across the photodiodes. This amplified voltage is then compared to a reference voltage, and if it is higher than the reference voltage, it is seen as a 1 or a 0, depending on the expected signal. For the TSOP77438TR, the threshold is set to be approximately 0.56V, and any signal above this voltage is seen as a 1, and any signal below is seen as a 0.

Conclusion

The TSOP77438TR is an integrated remote receiver designed primarily for modulated IR signals used by 38kHz and 40kHz remote control systems. It is an omni-directional receiver, allowing for greater range and accuracy in consumer remote control applications. Its working principles are based on a photodiode array, which is connected to an internal amplifier and compared to a reference voltage. This results in a reliable, low-cost solution for a wide range of sensing applications.

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