A related question is a question created from another question. When the related question is created, it will be automatically linked to the original question.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
TMS320F28377D: ADC performance compared with F28835
F2837x family devices have 4 ADC modules vs one module on F28335. This allows a higher sample throughput vs. F28335 as well as more simultaneous samples (4 vs. 2).
There are also many other important ADC specifications in the device datasheet, most of which have improved to some extent between F28335 and F2837x.
All that being said, the F28335 device and ADC are still very useful and competitive parts and we still see new design-ins with this part.
The F28335 device has 2 x S+H circuits, but only one converter, so the max sample throughput is 12.5MSPS (two samples can be captured in parallel, but the ADC still converts them sequentially).
The F2837x device has 1 x S+H circuit per ADC, and 4 ADC modules, so the total throughput is 14MSPS (4 samples can be captured in parallel and converted in parallel).
As far as other specifications, the main ones would be accuracy (Gain and Offset error), linearity (INL and DNL), and AC performance (SNR, THD, etc.). You can compare the datasheets for the two devices and see that these specifications are similar or have improved from F28335 to F2837x.
We usually see customers for these devices sampling many signals (e.g. 3 motor currents and 3 motor voltages) vs a single high-speed signal (e.g. a radar return), so the parallel ADCs with higher accuracy are typically a little bit better choice (but the F28335 device still exists for customers that want a single high MSPS ADC).
