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AD8015 for light detection

Question asked by Bastbech on Dec 16, 2016
Latest reply on Dec 19, 2016 by Dongfeng

Dear all,

 

I am trying to use the AD8015 for a visible light communication application. For the moment, I am simply transmitting a square light signal at 1 MHz that I receive with a Hamamatsu S3590 photodiode, which has a large juction capacitance. The photodiode is reverse biased at -5V, as shown on the schematic enclosed. Then I am observing the ouput signal given by PIN 7. The resulting trace is also enclosed and shows that the output signal is indeed a square wave (here at 500 kHz, recorded in a dark room) but never returns to around 0 V as it should when the transmit light is off.

I am sure the device is not connected properly but I can't really know what to do.

Thank you advance for your aswers.

 

Bastien

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