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Altera_Forum's avatar
Altera_Forum
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17 years ago

DSP cycloneII dev. kit : how to remove dac transformer ?

I'm trying to get some low frequency signals from DAC converter. It's not possible because of T1 transformer cutoff frequency What is the frequency - bandpass ? Why this transformer ? How to...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

Thank you for the reply.

Unfortunately, a wire between T1.6 and T1.3 produces only a positive signal to the output.

If I want to get negative signals, it is necessary to use an amplifier OP680, with +5V/-5V supply power, 4 additional resistances (500ohms) :(

Unfortunately, even on terrasic adc/dac daughter card, there are transformers on the DAC outputs.

Do you know a card without this transformer?

thank you in advance,

ssiami