Part Number: DDC1128EVM
Hello
I would like to use the dual-channel DDC112EVM to measure two photodiode current signals.
With the photodiodes I measure the absorption of gas in the MIR region of light, where the light source is a LED.
The LED cannot be driven in a continuous mode, so it is modulated at 1 kHz with a 50% duty cycle (switching the LED on and off).
How can I get the DDC112 to integrate only over the ac component (signal amplitue during the ons of the LED)? Is there a way to trigger and time the DDC112 externally? I don't think it makes a lot of senese in terms of signal to noise to let the DDC112 randomly integrates over the modulated signal. Any tipps for a suitable setup are appreciated, I do not have a lot of expertise in electronics (chemist).
The photodiodes are very sensitive to biases, especially reverse bias. Are there any precautions I need to take when using the DDC112EVM, or can I just simply connect the photodiode to the input?
