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 Post subject: uda1305
PostPosted: Wed Oct 27, 2010 5:53 am 
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Does anyone have a datasheet for this dac? Philips uda1305
Cheers
Alex


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 Post subject: Re: uda1305
PostPosted: Wed Oct 27, 2010 10:15 am 
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alexandre wrote:
Does anyone have a datasheet for this dac? Philips uda1305
Cheers
Alex

I think the TDA1305 was ment...
I could not find any UDA1305 on the Net


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 Post subject: Re: uda1305
PostPosted: Wed Oct 27, 2010 2:05 pm 
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I think I have that datasheet at home, I'll search tonight.

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 Post subject: Re: uda1305
PostPosted: Wed Oct 27, 2010 2:12 pm 
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carlosfm wrote:
I think I have that datasheet at home, I'll search tonight.

Would be great, Thorstens's mystery chip!
http://www.amr-audio.co.uk/html/cd777_individual.html


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 Post subject: Re: uda1305
PostPosted: Wed Oct 27, 2010 5:37 pm 
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Yes, from the description it looks similar to tda1545:
"Amongst its features are a continuous calibration concept, fast settling time to enable 2, 4 and 8 times oversampling (serial input), adjustable bias current for maximum dynamic range, internal timing and control circuits, I-squared-S bus input format (time multiplex, two’s complement, TTL up to 384KHz), no zero crossing distortion, low power consumption and low total harmonic distortion. Full-scale output is 2mA, THD at 0dB is -90dB, A-weighted S/N ratio is -101dB and current settling time to ±1 LSB 200ns."

It still amazes me how nice of a sound you can get from these Philips single supply chips, especially the tda1545 and tda1387. I'd like to parallel 8-16 of these and maybe do the moving average thing as well (linear interpolation).

Have fun,
Alex


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 Post subject: Re: uda1305
PostPosted: Wed Oct 27, 2010 6:05 pm 
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Sorry, my confusion.
The "similar" datasheets that I have are:

- UDA1351TS (96Khz bitstream dac with S/PDIF input)
- UDA1330ATS - some cheapo bitstream dac for PC audio and car audio applications.

This UDA1305 is a mystery.

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"Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius - and a lot of courage - to move in the opposite direction." Albert Einstein


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 Post subject: Re: uda1305
PostPosted: Wed Oct 27, 2010 7:46 pm 
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I'll add my echo to the UDA1305AT being a mystery. The only reference to such a chip which I could find via google was in regards to the AMR-777 CD player. I have a copy of the Philips "Audio IC" product line catalog from 1997 and it makes no mention of such a DAC, the TDA1305AT being the closest named device.

Because Thorsten Loesch is a staunch proponenet of non-OS D/A conversion I doubt whether it is actually the TDA1305AT which AMR is using. The TDA1305AT features a built in oversampling filter which doesn't 'appear' to have a bypass mode.


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 Post subject: Re: uda1305
PostPosted: Wed Oct 27, 2010 8:12 pm 
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...and the TDA1305 is bitstream.

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"Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius - and a lot of courage - to move in the opposite direction." Albert Einstein


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 Post subject: Re: uda1305
PostPosted: Wed Oct 27, 2010 10:25 pm 
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carlosfm wrote:
...and the TDA1305 is bitstream.


Hi Carlos,

Yes, the TDA1305 data sheet calls it a bitstream DAC while AMR calls the mysterious UDA1305 a multi bit DAC. This is further confused by the fact that the TDA1305 data sheet shows that device to contain dual 4-bit converters, one per signal phase, per channel. So the device is a multibit DAC, though one of very low resolution. A 2nd order noise-shaper is then employed to obtain an 16-bit effective performance. Such a course, multi bit converters + noise-shaping, is typical of about every monolithic sigma-delta audio DAC in production, excluding PWM DACs. Even most DSD application DACs appear to convert DSD to a low multi bit format within the DAC chip prior to conversion. i'm not sure whether any commercial chip vendor currently still produces a single-bit bitstream DAC chip intended for high quality audio.

-Ken


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 Post subject: Re: uda1305
PostPosted: Thu Oct 28, 2010 5:15 pm 
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Think it's a typo and UDA1350 is meant.

Using crossref on UDA135.. on the NXP site, this chip exists (no longer produced).

Trying crossref on UDA130.. there are no hits.

:doh:


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 Post subject: Re: uda1305
PostPosted: Thu Oct 28, 2010 6:37 pm 
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guido wrote:
Think it's a typo and UDA1350 is meant.

Using crossref on UDA135.. on the NXP site, this chip exists (no longer produced).

Trying crossref on UDA130.. there are no hits.

:doh:

Yeah but what typo??
TDA1305 ment or UDA1350?
In view of Thorsten's mix up of the TDA1541 inputs long time ago I consider the latter...
Quote from UDA1350ATS datasheet: "The UDA1350ATS is a low cost audio IEC958 decoder with an on-board DAC. The minimum audio input sampling frequency conforming to the EC958 standard is 28.0kHz and the maximum audio sampling frequency is 54.0kHz. "


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 Post subject: Re: uda1305
PostPosted: Fri Oct 29, 2010 4:58 pm 
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hI,

Elso Kwak wrote:
Yeah but what typo?


I know, I is lysdexic, this case, no typo.

If you bought a few thousand chips from your usual sources, they can get you the data-sheets. Mine did.

May the road rise to meet your steps.

Ciao T

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Practice is when everything works but you don't know why.
Guruhood is when you know everything and everything works accordingly.


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 Post subject: Re: uda1305
PostPosted: Thu Nov 04, 2010 2:44 pm 
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Kuei Yang Wang wrote:
hI,

Elso Kwak wrote:
Yeah but what typo?


I know, I is lysdexic, this case, no typo.

If you bought a few thousand chips from your usual sources, they can get you the data-sheets. Mine did.

May the road rise to meet your steps.

Ciao T

Back to square one. Anyway it's not a top-of-the-line DAC.
(And Kusunoki was wrong ;))


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 Post subject: Re: uda1305
PostPosted: Thu Nov 04, 2010 8:25 pm 
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It may not be a top of the line dac, but from that you can't figure out how it sounds.

If nobody asks, I will.
Thorsten, could you please post the datasheet?

Thanks. :thumbsup:

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Carlos Filipe

"Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius - and a lot of courage - to move in the opposite direction." Albert Einstein


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 Post subject: Re: uda1305
PostPosted: Sat Nov 06, 2010 10:40 am 
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carlosfm wrote:
It may not be a top of the line dac, but from that you can't figure out how it sounds.

If nobody asks, I will.
Thorsten, could you please post the datasheet?

Thanks. :thumbsup:

That was exactly the 1st post in this tread: asking for the UDA1305 datasheet!

For an overview of Philips DACs in it's high days see:
http://www.nxp.com/acrobat_download2/va ... IGITAL.pdf


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