Hello, In my application I want to use external ADC with Arduino for recording of my sensor's analog output. As my sensor output is in mV with 5 MHz High frequency and want to configures it with my Arduino Uno. for that I require an external ADC with High sampling rate around 10MSPS with small input voltage range. I have a confusion about selecting an ADC IC in my application. is anybody can suggest me which ADC will be the best choice for me? The problem is I want to record my sensor's peak-to-peak voltage which is in mV. if I use an amplifier before ADC then Could it be possible to know what is my sensor's actual peak-to-peak value (before amplified)? I welcome all of your valuable suggestions, remarks, and Thank you for your feedback! |
by Daxesh0101
August 12, 2018 |
It is usual to have an amplifier of known gain before the ADC. If you only want the peak voltage there are plenty of peak circuits, then your ADC can be slow. And cost a whole lot less than a premium 10MSPS type. |
by mikerogerswsm
August 12, 2018 |
Thanks Mike for your Feedback. I have already looked some Data Acquisition boards and devices but they are too expensive. |
by Daxesh0101
August 13, 2018 |
ADCs run at two quid each and you could add fast preamp and peak detectors for less than ten quid. Is this too expensive? |
by mikerogerswsm
August 13, 2018 |
Sorry Mike but I didn't get you quite. Can you explain me some more in detail or send me any link for that. Thanks. |
by Daxesh0101
August 14, 2018 |
by mikerogerswsm
August 14, 2018 |
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ps - I assume that you don't want high speed because you are using a creaky slow Arduino which with a 16MHz clock is only going to give you about 1MHz actual speed. That is why I suggest using fast amplfier and peak detectors followed by a slow ADC. |
by mikerogerswsm
August 15, 2018 |
Thanks Mike but If I replace Arduino with some new Developement Board like STM32 or another one with inbuilt high sampling rate ADC then could it be worthful ? |
by Daxesh0101
August 15, 2018 |
An SMT32 will run at 48MHz clock so you have only five instructions. Can you really achieve this? |
by mikerogerswsm
August 15, 2018 |
On reflection I think I'd get a fast ADC output straight into external memory and at leisure get the processor to read the results. Of course this depends on having a limited sample time. |
by mikerogerswsm
August 15, 2018 |
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