I need to read 3 ADC channels simultaneously, where the frequency will be maximum 400kHz. The waveform will be sinewave of +/-2V （peak to peak) The data must be stored into an SDCARD and read using a PC, it can be a CSV file. Multiple files are OK as long as they can be joined together and uninterrupted in recording. Prefer to us ANALOG Devices ICs. Please advise.