What is maximum MSPS for multi-channel ADC?

KKIM.6 · ‎2023-10-25

I need 1.5 MSPS speed for my array device having 1536 pixels.

I saw that the STM32WB55VGY6TR microcontroller operates its ADC at a maximum speed of 4.26 MSPS in the manual.

So, my question is, if I activate 16 channels (the maximum number of channels of this microcontroller), what would be the maximum MSPS?

It should be 4.26/16 MSPS? or same?

TDK · ‎2023-10-25

The short answer is that yes, it will be (4.26/16) Msps.

But the 4.26 Msps is for fast ADC channels at 12bit. There are not 16 fast channels available, only a few. If you use a slow channel and sample at this rate, you will not get as accurate results. Maybe you don't care and can live with lower resolution.

The datasheet has a large amount of information on how the ADC operates, including max sample rates for each type of channel.

If you feel a post has answered your question, please click "Accept as Solution".

View solution in original post

TDK · ‎2023-10-25

The short answer is that yes, it will be (4.26/16) Msps.

But the 4.26 Msps is for fast ADC channels at 12bit. There are not 16 fast channels available, only a few. If you use a slow channel and sample at this rate, you will not get as accurate results. Maybe you don't care and can live with lower resolution.

The datasheet has a large amount of information on how the ADC operates, including max sample rates for each type of channel.

If you feel a post has answered your question, please click "Accept as Solution".