Thanks for all the answers. I have tested the idea of writing to the registers of both at the same time to set mode and start conversion followed by individual data reads. With the ADCs sampling at 250Hz, I get a throughput of around 70Hz, which is sufficient for my application. Some more code optimization may be able to get it closer to the maximum rate of around 110Hz (single sample takes two conversion periods plus 1mS to complete according to the data sheets.).
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