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    You mean like an external ADC chip? What about a TeensyLC or Teensy3.6 instead? About 100KHz 12-bit ADC, if that's accurate enough. You could edit your question and say what "very good precision" actually means. Commented Feb 20, 2017 at 5:46
  • Define "very good precision". Define "high sampling rate". Define "negligible noise". What is the maximum voltage you need to measure? Your idea of "very good precision" and mine might vary by a considerable amount. You know that the chip vendors (like DigiKey) have search parameters that let you type in the things you want and it returns the chips that meet those requirements? Commented Feb 20, 2017 at 6:57
  • What are you planning to do with these figures? At 10000 samples per second, where are you going to store them? RAM? Disk? If in RAM you will soon run out of RAM on most microcontrollers after a second or so. If on disk, the speed of writing to disk will slow you down. So another question is: How many samples are you planning to capture? Commented Feb 20, 2017 at 7:01
  • I am trying to calculate total harmonic distortion of line voltage. I've already tried with Arduino Mega. I can store 3200 number of sample data into it's storage. The ADC captures data for like only 0.4 second but that's sufficient for me. The problem is, Arduinos ADC sampling rate can't be easlity determined and it adds some noise to obtained data I guess.Besides Arduino can't transmit data over serial port at a fast rate. Commented Feb 20, 2017 at 8:13
  • So now I'm thingking of using another ADC and interfacing it directly with Raspberry Pi and transmit sampled data directly to the Pi(if possible). Maximum volatge doesn't matter beacuse I'll have it stepped down and shifted within ADC voltage range.@NickGammon Commented Feb 20, 2017 at 8:13