What‘s the actual GBW of OPAMP in STM32F303？

(yellow line: non inverting input

blue line: output of OPAMP )

Hi,

I am using the NUCLEO-F303RE board and now I am testing the OPAMP3 , which is one of the peripherals in STM32F303.

I have set the PA1 as non inverting input, PB2 as inverting input. And I input differential signal (up to 400kHz) to OPAMP3. It seems that the voltage OPAMP output is too low.

According to​ official manual, the GBW of OPAMP is 8Mhz. But now this OPAMP has bad performance when input signal is 400kHz.

How do you think about it?

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