Generating the 38khz signal for TSOP ir sensor

[Harshal Suryawanshi]

hey guys i am working on a project which needs to sense the ir rays…now i have used a tsop sensor for that purpose but after going through the datasheet i am a bit confused about the 38khz signal it senses. please tell me how to generate this signal.

also it says in the datasheet:

“The data signal should fullfill the following condition:
• Carrier frequency should be close to center
frequency of the bandpass (e.g. 38kHz).
• Burst length should be 10 cycles/burst or longer.
• After each burst which is between 10 cycles and 70
cycles a gap time of at least 14 cycles is neccessary.
• For each burst which is longer than 1.8ms a
corresponding gap time is necessary at some time in
the data stream. This gap time should have at least
same length as the burst.
• Up to 1400 short bursts per second can be received
continuously.”.

kindly explain me what this means exactly and suggest a circuit to generate this data signal.

 

thank you.

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