TMS320F28376S: Is it possible to use all ADC inputs simultaneously?

Hi Miriam,

Each of the 4 ADCs can operate independently, although for best performance they should be operated synchronously in lock-step instead of asynchronously.

Each ADC can only sample and convert one signal at a time, so you can simultaneously sample no more than 4 signals. Here "simultaneous" means sampling all signals at the *exact* same instant.

Each ADC can sequence through the available connected channels in a variety of ways, so if you want to scan through all channels on the device in a single-shot or continuously, you can do this. The ADC sample rate for each ADC is about 3.5 MSPS (assuming strong input drivers which allow minimum S+H time) so the time to get all 24 channels is roughly (24 / 4)*(1/3.5M) = ~1.7us.

Note that a given ADC can only sample the channels it is connected to (not all 24 channels).

As far as SW configurations, the configurations should be mostly the same between ADCs (except maybe selecting different channel numbers). ADC channels A0,A1,and B1 are multiplexed with buffered DACs which results in some additional parasitics on these pins even when the DACs aren't used. Channel B0 is muxed with a DAC reference, which results in increased parasitic capacitance on that pin.

Many thanks, this answered all questions!