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Old 18th October 2015, 04:24 AM   #1
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Default About the UPC610D 10 bit d/a converter


I have a Yamaha yp-40 Clavinova piano, I include the schematic, it's the first one of that type, so I would keep it.

There is a UPC610D 10 bit d/a converter, is there a better d/a converter replacement to replace the UPC610D ?

I include the UPC610D spec sheet.

To improve the sound I will also replace all the NJM4558 opamp by better ones.



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Old 26th January 2016, 04:28 PM   #2
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Nobody reply ?



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Old 27th January 2016, 11:21 PM   #3
ojg is offline ojg
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Wow! This is old-school!

Anyhow, it seems to me it is not just the UPC610 which is the DAC. The mulitiplexer after it is also set up as a R-2R DAC in a clever arrangement.

So you can not replace just the UPC610 chip, you would have to replace the whole DAC section. And I do not think there is an off the shelf chip that would drop right in.

I'd say keep it as it is. It's vintage!
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Old 27th January 2016, 11:40 PM   #4
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I'd improve the analog output stage (improve power supplies and change filter components to higher impedance) before going anywhere near the DAC chip. Those opamp filters have to be the weakest link right now.
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