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GB on forum DAC
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<blockquote data-quote="gbyleveldt" data-source="post: 19927" data-attributes="member: 122"><p>Hi Chip,</p><p></p><p>I read your post about 3 times and I'm not too sure what you asking (not feeling very bright today for some reason).</p><p></p><p>Seeing as the I- and I+ lines of the PCM1794 are sitting at -3.1V, it is possible to have an opamp arrangement after the I/V that'll bring the output offset to 0V by simply biasing that stage to compensate for the -3.1V. You don't see this offset when using a differential to SE conversion as that offset gets cancelled out as it is the same potential on the I+ and I- lines. The cheaper DACs have a analogue reference output, where you connect the non-inverting input of the I/V stage to instead of the ground - as is the case with the PCM1794 - to compensate for the offset using only 1 opamp stage. It does get me thinking a little though...</p></blockquote><p></p>
[QUOTE="gbyleveldt, post: 19927, member: 122"] Hi Chip, I read your post about 3 times and I'm not too sure what you asking (not feeling very bright today for some reason). Seeing as the I- and I+ lines of the PCM1794 are sitting at -3.1V, it is possible to have an opamp arrangement after the I/V that'll bring the output offset to 0V by simply biasing that stage to compensate for the -3.1V. You don't see this offset when using a differential to SE conversion as that offset gets cancelled out as it is the same potential on the I+ and I- lines. The cheaper DACs have a analogue reference output, where you connect the non-inverting input of the I/V stage to instead of the ground - as is the case with the PCM1794 - to compensate for the offset using only 1 opamp stage. It does get me thinking a little though... [/QUOTE]
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GB on forum DAC
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