High Speed DAC Aliexpress

http://www.aliexpress.com/item/High-Speed-AD-DA-Module-Matching-FPGA-Black-Gold-Development-Board/2053961415.html

I bought this bad boy. Seems cool. Thought maybe I could brute force my way into AM radio land with it.

Also a good project for fpga. Microcontrollers are going to be too slow.

A noticeable problem is the missing of the pinout

http://www.wayengineer.com/blackgold-high-speed-adda-module-for-fpga-development-board-p-2753.html#.VlYh2d-rQfE

This appears to be the same product and I can at least confirm that this pinout does work for the DA side of things.

I wrote a quick test program to service it with a ramp function with an arduino. Good idea to sanity check before diving into the deeper waters of fpga.

Ripping through the arduino code with no delay makes a ramp at 53.2Hz. Pathetic, but working.

#define CLKPIN 2 
//Lowest bit pin on 6, highest bit on 13

void setup(){
  pinMode(CLKPIN, OUTPUT);
  digitalWrite(CLKPIN, HIGH);
  
  for(int i = 0; i< 8; i++){
    pinMode(13-i, OUTPUT);
  }
}
byte count = 0;

void loop(){
  count++; 
  digitalWrite(CLKPIN, LOW);
  for(int i = 0; i < 8; i++){
    digitalWrite(6+i, count & (1 << i));
  }
  digitalWrite(CLKPIN, HIGH);
}