Does any line have 20 differential channels with PGA? Any parametric search to such thing?

Miyuki · ‎2024-04-12

Hi,

does have any line of STM32 possibility to measure 20 differential channels with voltages of about 100-150mV. So PGA will be welcome.
In classic parametric search, I cannot find such parameters.

Peter BENSCH · ‎2024-04-12

Ah, sorry, I should have read your requirements more carefully. Correct, the PGA cannot process a differential signal.

I did a quick check and was able to assign 18 differential ADC channels to packages with 128 pins, you might be able to get 20 with a little rearranging. However, as the 150mV signals are somewhat small, in my opinion differential opamps or PGAs would have to be connected externally.

Regards
/Peter

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Peter BENSCH · ‎2024-04-12

Yes, just have a look at the family of STM32G4 providing up to 5 independent ADC with PGA.

Hope that helps?

Regards
/Peter

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Miyuki · ‎2024-04-12

The G4 series cannot do it. They can use OPAMS as PGA but just with single ended signal (and have just a limited number of inputs to them). It has no way to convert differential signals to single ended ADC. And ADCs itself are just single ended without a gain stage.

Peter BENSCH · ‎2024-04-12

Ah, sorry, I should have read your requirements more carefully. Correct, the PGA cannot process a differential signal.

I did a quick check and was able to assign 18 differential ADC channels to packages with 128 pins, you might be able to get 20 with a little rearranging. However, as the 150mV signals are somewhat small, in my opinion differential opamps or PGAs would have to be connected externally.

Regards
/Peter

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.