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Looking for a new R2R dac chip (maybe make my own?)
Looking for a new R2R dac chip (maybe make my own?)
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Old 5th June 2018, 02:54 PM   #1
Tjj226 is online now Tjj226
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Default Looking for a new R2R dac chip (maybe make my own?)

Hello everyone.

I currently have a Dac End project dac that has been working quite well for several months and recently decided to up and quit on me.

While I am not 100% sure, I am thinking the dac chip probably died on me. Sadly the dac chip is an AD1865 chip and it is near impossible to get a genuine replacement.

I am wondering if there is a more modern R2R dac chip with current out. The only other Dac chips that I know of that will work would be the TDA 1543 or if I were to change the board design, the PCM1704. But both of those chips are just as hard to find as the AD1865 so it doesn't do me a lot of good.

----------------

I am also considering building my own resistor ladder. I know I would have to go through the hassle of getting a good bench multimeter that goes out to some ungodly number of digits to match the resistors well enough to get 16 bit resolution let alone 18 or 20.

However precision resistors will always be around and will only get better and cheaper in time. Going through the hassle of building a ladder once and maintaining it might actually be more feasible and less cumbersome than trying to sort through fake chinese r2r dac chips.

If anyone knows of a good R2R ladder dac schematic, I would love to see it
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Old 5th June 2018, 03:28 PM   #2
abraxalito is offline abraxalito  United Kingdom
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Have you looked at TDA1387? I've not found a fake one yet, not that I'd know how to tell. They sound very good indeed when treated well, and they're seriously cheap.
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Old 5th June 2018, 03:38 PM   #3
Tjj226 is online now Tjj226
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Quote:
Originally Posted by abraxalito View Post
Have you looked at TDA1387? I've not found a fake one yet, not that I'd know how to tell. They sound very good indeed when treated well, and they're seriously cheap.
Hmmm. Well for starters its a delta sigma dac, but I am noticing that its kind of the same deal with the AD1865. All the sources on ebay are from china.

I am really tempted to get something like this. AD AD1865N-K DIP-24 Complete Dual 18-Bit 16 3 FS Audio DAC | eBay

But I too do not know how to check if something like this is fake or not which is part of my hesitation for getting these chinese ebay chips.
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Old 5th June 2018, 03:41 PM   #4
abraxalito is offline abraxalito  United Kingdom
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Nope, its not delta-sigma, though strictly speaking is not R2R either. Yes all the sources are from China, does that mean they're all fake? How would one go about faking such an inexpensive chip though? I reckon the proof of the pudding is in the eating, so if the chip sounds great then does its provenance matter much?
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Old 5th June 2018, 03:44 PM   #5
Tjj226 is online now Tjj226
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Originally Posted by abraxalito View Post
Nope, its not delta-sigma, though strictly speaking is not R2R either. Yes all the sources are from China, does that mean they're all fake? How would one go about faking such an inexpensive chip though? I reckon the proof of the pudding is in the eating, so if the chip sounds great then does its provenance matter much?
True, fair point. I will get a couple. If nothing else I can use them for a different project and keep a small stock.
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Old 5th June 2018, 06:13 PM   #6
Tam Lin is offline Tam Lin  United States
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Originally Posted by Tjj226 View Post
Sadly the dac chip is an AD1865 chip and it is near impossible to get a genuine replacement.
Actually, getting a genuine replacement is very easy if you know where to look.

Rochester Electronics has hundreds of new, never used, AN1865 chips, all grades, PDIP and SOIC, in stock, for sale in quantities of 1 to 1000+, at reasonable prices.

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For over 35 years Rochester, in partnership with over 70 leading semiconductor manufacturers, has provided our valued customers with a continuous source of critical semiconductors. Today the Rochester Semiconductor Lifecycle Solution™ offers the world’s largest range of semiconductors with over 15 billion finished devices in stock, combined with extensive manufacturing capabilities from the world's largest die bank at over 12 Billion.
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Old 5th June 2018, 06:16 PM   #7
Tjj226 is online now Tjj226
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Originally Posted by Tam Lin View Post
Actually, getting a genuine replacement is very easy if you know where to look.

Rochester Electronics has hundreds of new, never used, AN1865 chips, all grades, PDIP and SOIC, in stock, for sale in quantities of 1 to 1000+, at reasonable prices.
Yeup. I already know about these guys, but they have a minimum order quantity of 6. I have a group buy going, but no one is biting.
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Old 10th June 2018, 01:40 PM   #8
miro1360 is offline miro1360  Europe
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go with AD1862 or PCM1704, you can consider PCM1702 (but here I have no experience)
... you are talking that ebay AD1865 are fakes, actually they are not fakes - they are genuine and are digged out from old devices (during recyclation process), you can use DIP chips without problems, strictly avoid SMD chips because SMD are digged out with hot air machines and it will degrade chips (PCM1704 from ebay) ...
you can be fine with AD1865, AD1862, PCM1702 in DIP package from ebay ...

Last edited by miro1360; 10th June 2018 at 01:47 PM.
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Old 10th June 2018, 01:43 PM   #9
miro1360 is offline miro1360  Europe
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or if you aware about genuity so much, there still be last source of R2R chip available, it is this one:
Rochester Electronics
: Part AD1862N


... or alternatively you can looking for PCM1704, sometimes they are available too from trustable source, like this one:
Rochester Electronics
: Part PCM1704U-J


...
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Old 11th June 2018, 12:49 AM   #10
Ken Newton is offline Ken Newton  United States
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Another intriguing option is the still in-production 16-bit PCM56. This chip has been extensively tested and advocated by diyaudio contributor 'Bernhard', who claims that spectrum analyzer measurement reveal it exhibiting superior linerarity to about every other R-2R audio DAC chip, including those of greater bit depth (FYI - I do not have personal experience with the PCM56).

Although not exactly cheap (about $25 ea. in small quantities via Digikey.com and mouser.com) they are much less expensive than the currently in-vogue discrete R-2R modules. Again, the PCM56 is still in-production and readily available from those factory authorized distributors.

PCM56U Texas Instruments | Integrated Circuits (ICs) | DigiKey
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