Internal ADC

[harry123]

• I'm using nucleo f446 board for adc sampling the internal adc is unidirectional. 
• Is there any other development board like nucleo or discovery with internal ADC which can give both positive and negative cycle of adc
• Please suggest me so that I can avoid external adc.

[KnarfB]

>  internal ADC which can give both positive and negative cycle of adc

do you mean differential input channels?

Check out the STM32G4 series, like NUCLEO-G474RE

hth

KnarfB

[TDK]

No STM32 chips can convert a negative voltage. The voltage range is always limited from 0 V to VREF+, even in differential mode. External ADCs will have the same limitation.

[harry123]

• I want to read both positive and negative cycle of a sine wave.
• Whenever I start adc sampling only positive values are given all negative values will be zero 
• Is there any solution 

Thank you 

[TDK]

The STM32 cannot convert negative voltages. Nothing can change that.

Create external circuitry to change the input to be always positive. AC coupling could be a possibility.