INFRARED_DATA_RECEIVER

Published:2009/7/14 7:43:00 Author:May | From:SeekIC

The LT1328 circuit operates over the full 1-cm to 1-m range of the IrDA standard at the stipulated light levels. For IrDA data rates of 115 kb/s and below, a 1.6-μs pulse width is used for a 0 and no pulse for a 1. Light levels are 40 to 500 mW/sr (milliwatts per steradian). The figure shows a scope photo for a transmitter input (top trace) and the LT1328 output (bottom trace). Note that the input to the transmitter is inverted; that is, transmitted light produces a high at the input, which results in a zero at the output of the transmitter. The MODE pin (pin 7) should be high for these data rates.



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