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Subject: Buffering voltage DAC outputs (cs43122,...)?
Date: Mon, 09 Dec 2002 19:56:36 +0100
Organization: Wanadoo, l'internet avec France Telecom
NNTP-Posting-Date: 9 Dec 2002 18:56:36 GMT
X-Mailer: Mozilla 4.79 [en] (X11; U; Linux 2.4.20 i686)
I am designing a simple (but of reasonably high quality... ) DAC based
on CS43122. I will be converting the differential outputs to
single-ended, so on the output path there will be at least one
opamp-based differential-SE stage with the input impedance between 800
Ohm and 2.4kOhm. I wonder whether I need to put buffers between the
DAC's output (voltage, fully differential) and the diff-SE stage. These
would be either based on opamps (about $9 each) or on White's
followers. The problem is that I am not sure about the added value of
the buffers. The cs43122 datasheet specifies the load AC resistance of
>1k; it is not clear at all what impact would have 2-3k AC and DC
resistance. On the other hand, four buffers could make $36 - looks funny
compared to the $16 cost of the DAC... I don't have a bench to test
:-| Thanks in advance for any insight.
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