Can't get maximum ADC samples mentioned in datasheet using STM32H743ZI2 USB FS

[Pandian]

Guys currently I am working on STM 32 H7 board and trying to achieve 3.6MSPS as per mentioned in an datasheet, after many tries currently I can able to take 175k samples/second as 12 bit resolution ADC values using an USB FS but if they claimed to be 3.6MSPS is achievable means then we can achieve it right?? here I have attached my code that can get max of 175 samples only but I have to achieve more, help me to get out this problem

[Ozone]

Consult the datasheet + reference manual. I don't have a H7 variant.
Surely you will need maximal ADC clock frequency, minimal sampling time, and minimal inter-sample delays.
And probably a reduced resolution, and interleaved mode (were two peripheral units operate in unison to achieve a greater sample rate than each individual unit).

But I suspect your sampling hardware might not be up to the task. The external amplifier and interfacing circuitry at that frequencies requires a high bandwidth and low impedance which are not easy to achieve.

[Pandian]

Yeah thank you for your valuable response. but they claimed as at 16 bit resolution each ADC can go Upto 3.6MSPS..but while going with an Interleaved mode we uses 2 ADC to run an single signal right?? and here I mentioned an line from datasheet  - 3× ADCs with 16-bit max. resolution (up to 36 channels, up to 3.6 MSPS) while comparing to 3.6MSPS I only got around 175k samples only for an second which is smaller right?

[Andrew Neil]

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@Pandian wrote:

 I am working on STM 32 H7 board 

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What board? 

Please give details - see:   How to write your question to maximize your chances to find a solution.

 

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@Pandian wrote:

able to take 175k samples/second as 12 bit resolution ADC values using an USB FS 

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What does USB FS have to do with an ADC?

Is the problem with the ADC, or are you just talking about transferring the acquired data via USB?

[Pandian]

Yeah, Thank you , I am working with an STM32 NUCLEO H743ZI2 development board and I want to get max number of samples from ADC and i have already tried UART, I2C etc but to reach an 3.3MSPS, I am going with an USB FS transfer, (in an USB CDC transfer I can read an ADC values in every line using Tera-term, currently i got only 175k samples per second, but according to the datasheet I have to get an 3.3MSPS), I have already attached my code text file. I Hope you understand and I just need an solution to get those maximum number of ADC samples.

 

[Andrew Neil]

Still unclear whether your problem is

1. Getting the maximum sample rate out of the ADC itself, or
2. The transfer rate over USB.

 

What USB Class are you using?