Differential current output DAC output stage

K&K Audio / Lundahl Transformers

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In Reply to: Burr Brown 1738 <nt> posted by Russtafarian on September 12, 2003 at 14:45:45:

Well, the PCM1738 is a differential current output DAC. That leaves a few interesting possibilities. One can convert the currents to voltages using resistors and couple to the output jacks using a step-up transformer. The LL7902 is not the ideal choice here, because of the relatively low ratio. An LL7903 or LL1674 would be a better choice. Alterntively, one could do the I to V conversion as above and then use an active tube or soild state gain stage followed by an output transformer like the schematic at the bottom of my webpage (www.kandkaudio.com), except using a balanced active stage. This has the advantage of higher output voltage and lower output impedance, but takes some space that might not be available in the player box.

Kevin Carter
K&K Audio
www.kandkaudio.com

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Follow Ups Full Thread

Topic - SACD player upgrade with LL7902 - Russtafarian 14:26:09 09/12/03 (4)

Re: SACD player upgrade with LL7902 - KevinC 14:29:17 09/12/03 (3)

Burr Brown 1738 <nt> - Russtafarian 14:45:45 09/12/03 (2)

Differential current output DAC output stage - KevinC 16:14:55 09/12/03 (1)

Re: Differential current output DAC output stage - Russtafarian 16:36:48 09/12/03 (0)

Follow Ups

Differential current output DAC output stage - KevinC 16:14:55 09/12/03 (1)

Re: Differential current output DAC output stage - Russtafarian 16:36:48 09/12/03 (0)

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