Bogey, It's possible that the ADS131A04 can be a replacement for four AD9629, but I think I'd need more information about the application. Is the 1.8V operation important? Does the application require simultaneous sampling of the four different input channels? What is the input voltage? You mention an FFT function, but I'm not sure what that is a measurement for. Is the input measurement single-ended or differential. I don't know if there is a good fit that is an automotive grade device. Also I'm not sure if there is similar device that is SAR type ADC (instead of the ADS131A04 which is delta-sigma). If you post more information about the application, we may be able to find a better fit. Joseph Wu
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