PCF8591 has one 8 bit ADC on board for 4 channels. The ADC is 8 bit and quite fast. At 100 KHz one gets more than 2000 reads per second for read() and more than 2000 writes per second for write().
The AD7367 is a device with two ADC's which can sample 2 channels simultaneously at 14 bits with a theoretical speed of up to 1 MSPS. The AD7366 is a similar 12 bits device. The two samples can be ...
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