Query regarding ADC features in ESP32 WROVER

[Jalpan Parekh]

I have made some analysis regarding ADC features in different controllers. I have refereed ESP32 technical reference manual, but did not get much information about ADC frequency or sampling rate etc.
I would like to know below features availability in ESP32 WROVER and also if any extra features available. I am more interested to hear sampling rate in ESP32 WROVER.

STM32 supports following ADC features:
1. 12-bit successive approximation ADC
2. Supported modes
- single or dual (simultaneous) mode
- regular or injected mode
3. Sampling rate is 2 MSPS
4. Sampling time configurable
5. Calibration facility

NUC472(Nuvoton) supports following ADC features:
1. 12-bit successive approximation ADC
2. Operation modes:
- Single cycle
- Single cycle scan mode
- Continuous cycle scan mode
3. Sampling rate is upto 1 MSPS

Thanks,
Jalpan Parekh

[Jalpan Parekh]

Any update on this issue ?

[Ritesh]

Espressif SDK Developers,

I and Jalpan are working together into ESP32 based projects and we have few questions regarding ADC operations.

Would you please check thread details sent by Jalpan? Let him know if you need more details regarding that.

[WiFive]

Read the TRM

[Jalpan Parekh]

Hi WiFive,
I have gone through the ESP32 TRM but did not get any information regarding Sampling rate. So can you please let know me the exact sampling rate? Is this varying by changing ADC resolution for 8bit, 12bit etc ?

[WiFive]

You're right it is not well documented

https://www.google.com/search?q=site%3A ... g+rate+adc

[Jalpan Parekh]

Hi WiFive,
Referred many threads from the attached link and few questions raised.
1. Sampling rate is 6KSPS ? Please confirm.
2. 6KHz frequency is divided to all the channels ? If yes then what is the frequency rate or sampling rate of single channel ?
3. Is there any way to increase sampling rate ?
4. Is sampling rate change by changing ADC resolution ?

[WiFive]

You can definitely acquire samples faster than 6ksps, I don't know what that limit is based on. As you can see there is not much response from espressif on those threads. Suggest you ask your official sales/support contacts.

[bobolink]

They make an Audio Development Framework. Maybe that would interest your team.