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Philips tda1305 (hybrid multi-bit/bitstream DAC with interpolation)
Philips tda1305 (hybrid multi-bit/bitstream DAC with interpolation)
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Old 2nd December 2020, 01:42 AM   #11
abraxalito is offline abraxalito  United Kingdom
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Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Quote:
Originally Posted by 1z2a3y View Post
If you are "sure of this", please find the datasheet for the "UDA1305" device, and provide a link.
Nope you've got it the wrong way around. The evidence is that UDA1305 is the chip being used by AMR. You're claiming its really a TDA1305 so then you need to stump up the datasheet to support your claim.
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Old 2nd December 2020, 03:22 AM   #12
1z2a3y is offline 1z2a3y  United Kingdom
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Default AMR's claim

Quote:
Originally Posted by abraxalito View Post
Nope you've got it the wrong way around. The evidence is that UDA1305 is the chip being used by AMR. You're claiming its really a TDA1305 so then you need to stump up the datasheet to support your claim.
Call me confused.
What evidence? .... that what AMR is claiming to use -- a putative Philips UDA1305 dac -- has no Internet-based references? (As the diyhifi thread also acknowledges.)

OTOH, the well-accounted-for Philips dac with a similar model number (tda1305) has plenty of references and multiple sources of datasheets. See my OP. Many links there including the TDA1305 datasheet.
And, ttbomk, AMR is the only audio company that mentions a "Philips uda1305at dac" in their literature.
It's a highly intriguing story, tho'!! Although not always the case (with marketing and selling). I think it is usually best to be honest in the opening act. Otherwise, half-truths and concealments begin to accumulate as probing queries begin. One political lie on top of another are the usual and necessary corporate defence. And, then, the house of cards collapses ... .and there is egg on faces.
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Old 2nd December 2020, 05:22 AM   #13
abraxalito is offline abraxalito  United Kingdom
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Originally Posted by 1z2a3y View Post
Call me confused.
OK - you're confused. You're claiming AMR are using the TDA1305 in two players. Where's your evidence for such a claim?
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Old 2nd December 2020, 06:25 AM   #14
davidsrsb is offline davidsrsb  Malaysia
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Was the AMR UDA1305 a typo for the UDA1350?
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Old 2nd December 2020, 09:30 AM   #15
rfbrw is offline rfbrw
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Old 2nd December 2020, 03:43 PM   #16
1z2a3y is offline 1z2a3y  United Kingdom
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Default 6moons has the scoop

Google searching the topic reveals quite a bit.
6moons reviewed AMR CD-777 a while back. Their comments and photos can CLARIFY the issue.

Let's have squiz, shall we class ...

6moons audio reviews: Abbingdon Music Research CD-777
The review notes:
Quote:
On the main circuit board, AMR stickers conceal the identity of various digital chips to protect specific circuit details.
And here's some damning evidence (photo from 6moons review). The "1305" chip is in the top-middle of the magnified area.
Click the image to open in full size.
================

Anyway, the CD-777 gets decent reviews and that's enough to spark interest in the Philips TDA-1305 continuous calibration dac.
As noted in the OP, both Chinese kits and indiv. TDA1305 chips are dirt cheap and worth DIY experimentation. I think I'll order a few units for further investigation.
The Philips TDA-1305 was possibly intended to be a replacement for 1541A. And most likely a step up from the economy TDA1543 and especially the other budget (8-pin) Continuous Calibration dacs Philips was concurrently offering (tda1545 and tda1387)
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Old 2nd December 2020, 06:06 PM   #17
rfbrw is offline rfbrw
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Beware class, looks like we've got the supply teacher in today.
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Old 20th December 2020, 03:50 PM   #18
1z2a3y is offline 1z2a3y  United Kingdom
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Default The Fever dac.

Just put in an order at Ali for this (about $38 usd total):

"Dual TDA1305 DAC chip + CS8412 Digital reception + CM108 USB Fever Class HIFI DAC Decoder board with usb fiber coaxial input"

Aliexpress product page images below ...



Click the image to open in full size.

Click the image to open in full size.

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Old 6th January 2021, 05:03 PM   #19
1z2a3y is offline 1z2a3y  United Kingdom
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Well, the above board still has not arrived .... but some comments are still in order.
First, it seems that SUPERB tda1305 dac was used in multiple NAIM cd players in the late 90s and early 00's. I'm sure these suberbly-crafted units sounded absolutely superb ... or as they say in the UK .... Seeeeeeeeeuuuu PUHHHHHB.
Naim's superb trick may their superbly-superb use of 7-pole analog output filtering. That in addition to a gazillion regulator stages for each section ICs, etc.

So the above Chinese board may become quite the viral thread here on DIYA, given the potential of this superb DAC.
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Old 6th January 2021, 09:51 PM   #20
diyiggy is offline diyiggy
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lol... few chance imho. The problem is most of the literature is around always the same chips : TDA1541, 1543, few 1545. So few experiences shared with the others Philips chips = you're in the dark or drive alone.


Naims had qualities but mostly a little hard/cold sided... not so good ! Pricey though.
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