Thursday 10 November 2016

infrared - IR receivers: how to interpet "Max. Envelope Duty Cycle vs. Burst Length"?


In the datasheet of an IR receiver IC, intended for remote control applications, there exists this graph.


Why is there such a sharp translation after a certain carrier impulse count?


enter image description here



Answer




From the datasheet first page:


enter image description here


So the control circuit (AGC - automatic gain control) circuits suppress background flicker like events to reject unwanted signals. This effect limits the length of data that can be sent.


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