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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 30th November 2020, 04:59 PM   #1
1z2a3y is offline 1z2a3y  United Kingdom
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Default Philips tda1305 (hybrid multi-bit/bitstream DAC with interpolation)

Seems as if the mid-1990s-designed Philips tda-1305 has gained a cult following in the Chinese diy community, and maybe certain UK high-end manufs, too.

Current AMR cd player that uses tda 1305:
CD-777 SE Compact Disk Processor by AMR Audio

Legacy AMR cd player (used tda 1541a; AMR later switched to tda1305):
CD-77 Compact Disk Processor by AMR Audio

Legacy Naim CD 3.5 CD player from 1998:
Naim CD 3.5 CD player | Stereophile.com

Various low-cost TDA1305 Chinese kits on Ali and eBay including this USD $31 2x TDA1305 device:
Dual TDA1305 DAC chip + CS8412 Digital reception + CM108 USB Fever Class HIFI DAC Decoder board With usb fiber coaxial input|dac decoder board|dac decoderhifi dac - AliExpress

....and this USD $30 TDA1315H+TDA1305T device on eBay:
TDA1315H+TDA1305T Decoders Fiber Coaxial To AnalogAudio Signal DAC ZJ-64 | eBay

And indiv. 1305 chips are readily avail and dirt cheap on eBay and Ali.

tda1305 datasheet:
http://www.acoustica.org.uk/t/naim/data/TDA1305.PDF
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Old 30th November 2020, 06:45 PM   #2
1z2a3y is offline 1z2a3y  United Kingdom
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Just looking at the TDA1305 PDF data sheet .... either it is deliberately overwritten .... or this device really is complex. Any Philips insiders here want to weigh in? Was the 1305 a low-end or high-end project. For example, the tda1543 and 1545 were mostly for low-cost devices.
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Old 1st December 2020, 08:25 AM   #3
abraxalito is offline abraxalito  United Kingdom
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Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
UDA1305 is what's used in the AMR CD players, not TDA1305. They're rather different - we can be sure of this because the upsampling digital filters on TDA1305 cannot be bypassed but those players offer NOS mode.
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Old 1st December 2020, 03:01 PM   #4
1z2a3y is offline 1z2a3y  United Kingdom
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Default The mysterious "UDA1305"

Quote:
Originally Posted by abraxalito View Post
UDA1305 is what's used in the AMR CD players, not TDA1305. They're rather different - we can be sure of this because the upsampling digital filters on TDA1305 cannot be bypassed but those players offer NOS mode.
If you are "sure of this", please find the datasheet for the "UDA1305" device, and provide a link.
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Old 1st December 2020, 05:51 PM   #5
rfbrw is offline rfbrw
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As soon as you show a TDA1305 with 8 pins.
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Old 1st December 2020, 08:09 PM   #6
1z2a3y is offline 1z2a3y  United Kingdom
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Googling TDA1305, it seems as if Philips intended it to be used as their Continuous Calibration dac for higher-end devices (Cambridge Audio, Naim, etc are some of the manufs that have used the 1305). Meanwhile, budget devices (soundcards, etc) has cost-effectiveness of TDA1543, -45 and TDA1387.
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Old 1st December 2020, 08:58 PM   #7
rfbrw is offline rfbrw
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Google notwithstanding, the device in the AMR is the UDA1305AT.
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Old 1st December 2020, 09:34 PM   #8
1z2a3y is offline 1z2a3y  United Kingdom
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Default The mysterious "UDA1305"

Quote:
Originally Posted by rfbrw View Post
Google notwithstanding, the device in the AMR is the UDA1305AT.
Was this some sort of limited, experimental DAC that Philips never officially released?
The "1305"-based CD player from AMR has been around since at least 2011. On diyhifi.org, there's a thread about AMR's mysterious 1305 Philips dac chip.

Close-up photos of the AMR's stuffed PCB would be helpful. As, of course, the elusive datasheet or other references.
It could also be a deliberate obfuscation by AMR to protect their IP. Nothing wrong with that! Many manuf's grind out their IC's printed surfaces for a similar end goal.
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Old 1st December 2020, 09:49 PM   #9
rfbrw is offline rfbrw
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There is no obligation on the part of the manufacturer or end user to provide datasheets to all and sundry. The designer has stated that the terms under which the datasheet was acquired precludes sharing and that is fine by me. There are many devices out there that do not have a freely available datasheet and the UDA1305AT is just one more.
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Old 1st December 2020, 09:55 PM   #10
martin clark is offline martin clark  Europe
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The original TDA1305 is a moderately- to really-enjoyably-good dac - of 20+yrs ago. Philips took what they'd learned in dumbing-down their 'continuous calibration' ideas (started with the TDA1541) translated into trying to deal with the Vref -sensitivity of much cheaper-to-make cmos, bitstream, single-5v supply dacs for mass market. It was one of several such approaches they made; also, capable of very good performance when well-implemented. But creamed by the Phillips high-end - bitstream 7 ' series devices.

Anything like a 'tda1305' of rather fewer pins is going to be even less flexible, markedly crappier as a result, and really ought to be cheap, cents each now; - probably the source of any such current 'popularity'.

Seriously - for comparable budget and effort you've better choices to make at this distance.

What are you trying to achieve?

(eta: disclosure - the old acoustica pages are mine)
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