Sampling frecuency of DAC

Official Hardware Mega Due
1

Hello,

I'm using Arduino DUE. Can you tell me what is the maximum sampling frecuency that DUE able to represent?
When I generate a signal with frequency greater than 250Hz, the output is bad...
Help me please

Thank you!

2

Post your code, let's see what you're doing.

250Hz should be easy, can do that on a 328P even with its much slower system clock using direct port manipulation.
Here's an example with 8 tones from a 1284P, similar to a 328P but with 32 IO instead of just 20.
http://www.youtube.com/watch?v=4c8idXN4Pg0
(coded for 13, but I ran out of buttons for the demo, so only 8 notes are shown. browse for my post "piano tones micros" to see the code & simple schematic)

3

My code is:

void setup()
{
   Serial.begin(115200);
   analogWriteResolution(8);
   pinMode(DAC0,OUTPUT);
}

void loop()
{
   if(Serial.available())
   {
      byte salida=Serial.read();
      analogWrite(DAC0, salida);
   }
}

Thankyou

4

That code is only writing a value incoming from the serial port directly to the DAC.
So i ask how are you controlling the frequency ?
how are the values being sent through the serial?