TMS320F28377S: ADC sampling rate: F28335 vs. F2837x

Brian Wang0

Part Number: TMS320F28377S

Hi team,

I am helping my customer evaluating F28335 and F2837xS. F2837xS absolutely shows better performance in processing(higher MIPS, CLA, TMU and etc.), but we noticed there is a huge difference between the sampling rate of F28335 and F2837x.

Generally, the sampling rate of F28335 is 12.5 MSPS while F2837x is 3.5 MSPS. Similarly, I noticed we claimed lower sampling rate on other new generation devices: F28004x, F2807x and etc.

Since the ADC of F2837x(type 4) is not the same as F28335(type 2), did we changed the definition of sampling rate? How can we fairly compare the performance of this 2 ADC?

Thanks,

Brian

over 6 years ago

0 Srinivasa Chakravarthy over 6 years ago

TI__Intellectual 1360 points

Hi Brian,

F28335 ADC is indeed faster than F2837x ADC. The main reason being the ADC architectures are different pipelined ADC in F28335 Vs SAR ADC in F2837x ADC. SAR ADCs are inherently slower than pipelined ADCs. Is the latency/throughput of F2837x ADC not sufficient for the customer application ? If you can describe the signal path a bit more we can see If there are ways to meet their requirements.

Thanks,

Srinivasa

0 Srinivasa Chakravarthy over 6 years ago in reply to Srinivasa Chakravarthy

TI__Intellectual 1360 points

Brian,

Were you able to talk to the customer ? Do you have any more questions/updates ?

Thanks,

Srinivasa

0 Brian Wang0 over 6 years ago in reply to Srinivasa Chakravarthy

TI__Expert 5350 points

Hi Srinivasa,

Thanks for follow up.
The customer is trying to choose between F28335 and F28377s. Even though the F28377s is obviously more powerful in data processing and the total adc conversion speed is fairly good because of the 3 ADCs architecture. I was not able to explain why F28335's ADC conversion speed is much faster. Thanks for your guidance.

Regards,
Brian

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TMS320F28377S: ADC sampling rate: F28335 vs. F2837x