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Old 14th December 2009, 07:50 AM   #1
pho_boi is offline pho_boi  Australia
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Default help with TDA1543 DAC

Hey guys.

I'm wanting to build a DAC based on 16x TDA1543 chips in parallel, running VDD at 8.00V. But I'm a bit of a newbie to EE so need some help

I'm told the normal way to go passive output is a simple resistor and capacitor, but I would like to try using transformer coupled output. Maybe something from Lundahl transformers.

From some calculations, I figured out that the I/V resistor would need be 135ohms to avoid any distortion. Vref will be adjusted with a trimpot until mid-point voltage is around 3.85V to 4.00V. This would yield roughly 1.77V RMS at the output (I think).

Now I'm not too sure how I would connect the output stage using transformers. Please see the attached image, and ignore the 180ohm resistor and change it to 135ohm. Is the 100K resistor still required, and is everything else correct?

Thanks for reading!
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Old 22nd January 2010, 06:22 AM   #2
pho_boi is offline pho_boi  Australia
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Old 22nd January 2010, 08:12 AM   #3
jonners is offline jonners  United Kingdom
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I think you will have DC across your transformers if you do this.
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Old 28th January 2010, 10:57 AM   #4
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Yes there will be DC accross the transformer.

What is the impedance of each windings of the transformers ?
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Old 19th March 2010, 03:30 AM   #5
pho_boi is offline pho_boi  Australia
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Impedance 600ohm.

How should I be wiring this up? Any help is greatly appreciated!
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