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2017-07-07 12:42  
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This article describes the FTDI Infrared CIRCUIT (STP11NM60FP). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy these components:STP11NM60FP.
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Here is hobby project of building a home-brew IR receiver/transmitter based on the FTDI chipset.
This Project using several IR receivers and transmitters that where based on RS232 connections.

1335655739879 FTDI Infrared

Receiving is the opposite from transmission, and in this case it’s
‘sampling’ the pin at a high enough datarate. The chip will simply
sample all pins and put it in it’s fifo buffers. We can read the fifos
and inspect the samples.
To make reception reliable I’ve choosen to use a chip which already is
tuned to a specific carrier frequency and which outputs the demodulated
carrier, so in stead of sampling with 72KHz (see Nyquist: >2x max.
freq to be sampled), it is possible to sample with a much lower rate. A
lower baudrate will cause less CPU load during reception.

Decoding of the samples can be done relatively easy in software.
Detecting a ‘pulse’ or a ‘space’ is a matter of evaluating the received
samples and counting the number of samples in-between to get the timing
of the pulse and space.

1335655768618 FTDI Infrared