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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

I think I have that datasheet at home, I'll search tonight.

_________________
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

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

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

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.

_________________
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

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.

...and the TDA1305 is bitstream.

_________________
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

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

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.

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. "

hI,



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

_________________
Theory is when you know everything but nothing works.
Practice is when everything works but you don't know why.
Guruhood is when you know everything and everything works accordingly.

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

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.

_________________
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

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