When the SL638QOE receives a 38KHz infrared signal, it will output a low-level signal lasting only 400us

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davidy2004

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The continuous 38KHz signal does not allow the SL638QOE output to continue.
 

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The behaviour is expected by design of industry standard RC receiver modules. You should find a respective specification in the datasheet.

Quote from TSOP1738 spec:
Some examples for such disturbance signals which are suppressed by the TSOP17.. are:
• DC light (e.g. from tungsten bulb or sunlight)
• Continuous signal at 38kHz or at any other frequency
• Signals from fluorescent lamps with electronic ballast (an example of the signal modulation is in the figure below).
 

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