Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

DAC with THDB-ADA on DE2-115

Hi there, I'm working with DAC on the daughter board THDB-ADA. The pin assignments are correct, I believe, but the circuit doesn't seem to be working. Here are my waveforms from ModelSim, can so...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

Thank you very much :)

I'm think I know about this daugher board really well right now :)

The reason why this board doesn't receive the DC signal is that, if you have a look at the supplied schematic, there is a high pass filter (parallel RC) at every input. I calculated it to be 1.592 KHz. So, if someone would like to deal with voice frequency, they have to build a frequency amplifier interface.

The reason why I didn't get this to be solven before is that I was blindly believe their schimatic, in which the output-bit enables are inputs from that daughterboard, lol.

By the way, I'm using VHDL, not Verilog :D

We can discuss about this board if you like :)

Regards,

Tan