Hi Pierluigi, The requirement of using Simultaneous sampling or non-Simultaneous sampling ADC depends on if you need simultaneous information between the input signals on different channels. If you do not have this kind of requirement, a non-Simultaneous sampling ADC is a good option. If you compare the performance between the integrated device( ADS8688 family) with a discrete solution, the integrated device has the best performance and the performance on its datasheet has covered ADC, PGA and ADC driver etc. When you evaluate the performance of discrete solution (amplifier+ ADS8638 ), you will have to consider the error, drift and noise from both devices, not only ADC. If the cost is a concern and a 16-bit ADC is not necessary for your application, a pin-pin compatible 12-bit ADC, the ADS8668 in the same ADS8688 family can be considered. Also, the cost for 8 piece amplifiers( OPA140 ) plus ADS8638 cost should be considered for the discrete solution. However, I can provide the technical support to you for these both precision ADCs. Thanks. Best regards Dale
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