High frequency sampling signal (F > 20kHz) provided with Arduino Mega 2560 and send to Simulink

Hello dear friends,

I want to sample a frequency signal of 20kHz by the Arduino Mega 2560 board. The sampled signal must be sent in Simulink in order to do the necessary processing in an automatic control system. The simulink blocks intended for the acquisition of an analog signal (example: Analog_read ....) are limited in frequency to a few tens of Hertz. Please help me and thank you in advance.