STM32F100 ADC Sample Rate

[AAlsa.1]

The datasheet and ref manual only mention that the conversion time is 1.2 us but this is not enough to find the sample rate. All other stm32 products mention that explicitly, why not this one?

[AScha.3]

ever looked at a ds ?

[AAlsa.1]

This does not agree with the conversion rate. If it takes 1.2 us to convert, then the max sample rate would be 1/1.2 us which is 833 khz. The DS mentions 1 MHz.

[AScha.3]

read, before you complain : 1MHz is max. speed of adc. no precision and no input given. ok?

if you want real input, need add some sampling time , 1.5 min. , so 14 tics. at 12M -> about 857kHz .

anyway, with these adc 7.5 sampling is better, so 7.5+12.5=20 -> 600 kHz is maximum with real good data. and can trigger by timer ... so in real world: 500kHz or lower will work perfect.

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[AAlsa.1]

It does not make sense to specify fs for zero sampling time. 1 Mhz is not correct.

[MasterT]

I agree, data sheet is not correct. Probably, copy-paste error, 1 MSPS sampling rate is possible with ADC clock 14 MHz and up, and it's true with stm32F101.

Data sheet for stm32F100 needs correction

[KDJEM.1 · Accepted solution]

Hello @AAlsa.1​,

Thank you for reporting the issue.

To check and fix this issue, could you please mention the datasheet number?

Thank you.

Kaouthar

[AAlsa.1]

DocID16455 Rev 9