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In Reply to: Re: What makes you say that? posted by Ted Smith on May 1, 2006 at 05:17:31:
It's probably a little bit more than just matching the filter characteristics. Depending on how closely the manufacturer has tuned the DAC to a specific op amp, the measured performance (including out of band noise) may be highly dependent on the operating characteristics of the analog circuit.TI/BB wrote an interesting paper on this, which unfortunately I seem to have mislaid, otherwise I will post a link. I suspect they wrote this paper because too many implementers were assuming their flagship DACs were op amp agnostic and then wondering why the result don't quite get to the data sheet specs.
I would say depending on how finely tuned the DAC is to a specific op amp implementation, it may be very difficult to realise optimal performance without using that specific op amp. We all know that op amps have their limitations, and it's easy to pooh-pooh an op amp circuit, but at the end of the day op amps have very stable characteristics and are very good at what they do, as long as you live within their constraints.
Remember this conversation started because Allen was quentioning why Wolfson was recommended a "substandard" op amp with their 8740 DAC. I am simply pointing out that it may not be "substandard" if they have tuned their DAC to that op amp.
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Follow Ups
- Re: What makes you say that? - Christine Tham 14:06:07 05/01/06 (2)
- I mostly agree - Ted Smith 15:09:38 05/01/06 (1)
- Of course ... - Christine Tham 15:56:44 05/01/06 (0)
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