I am designing a circuit around the ADC08L060, it says in its datasheet that the output will be 2.6V typically. My FPGA GPIO pins only see active high from 3.3V. Will this ADC output be able to reach that value? Nowhere on the datasheet was i able to find that.

 

Read the datasheet more carefully.
2.6 V output is for VA = VDR = 2.7 V
Set VA = VDR = 3.3 V and it will be ok.

 

Thanks for the response, the max input voltage for AC input is about 3.3 volts. I am driving the input AC signal with an Op-Amp that is connected to a 12V power supply(can't change that). In case there would ever be a scenario in which the op-amp sends a signal higher than 3.3V, then i would like to clamp it. But diodes have either too high capacitances, and schottky diodes don't clamp at 3.3V. Any suggestions?

 

Thanks for the response, the max input voltage for AC input is about 3.3 volts. I am driving the input AC signal with an Op-Amp that is connected to a 12V power supply(can't change that). In case there would ever be a scenario in which the op-amp sends a signal higher than 3.3V, then i would like to clamp it. But diodes have either too high capacitances, and schottky diodes don't clamp at 3.3V. Any suggestions?

You don't need to clamp it, there are diodes in the package that will clamp the analog input to GND-0.3v and VA+0.3v. What you need to do is limit any current flow in/out of the pin to prevent chip overheating with a series resistor. In the case of the analog input that resistor will create a low-pass filter with the input capacitance so its value will be important, What is your maximum expected input frequency? Can you show your input amplifier arrangement.

Note the comment in the datasheet:



See also the example Fig 32 in the data sheet.

 

I have a series 47 ohm resistor in combination with a capacitor that leads parallel to ground which is 51pF.

 

That is for the input, for the output i have 47 ohm series resistors to all output pins

 

I have a series 47 ohm resistor in combination with a capacitor that leads parallel to ground which is 51pF.

Then no worries, its safe.

 

Great!