Log in or Sign up. Steve Hoffman Music Forums. Location: Tucson, AZ. I bought one new, sold it, bought another mint one, box, manual and all, sold it. And I just bought another.
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Measurements of TDA by Cyxchen. Thread starter WolfX Start date Nov 20, Nov 20, Last edited: Nov 20, Are you sending 24 bit data to the board and the AK is then truncating to send to the 16 bit converter in the deviation from linearity plot? And the roll-off in FR is not present in the white noise filter plot which appears pretty flat Thread Starter 3.
Are you sending 24 bit data to a 16 bit converter in the deviation from linearity plot? WolfX said:. You are right, I made a stupid mistake. Joined Feb 14, Messages 1, Likes I'm thinking that there's something interesting about your like of wolves.
Care to share? Thread Starter 6. I'm really not sure when Philips stopped manufacture altogether of the A. It's hard to believe it was still coming out of a Taiwan fab plant in I do know most, if not all of the S1 and double crown ones you see are fakes as they are just re-marked s.
If you see a date code after on a crown, it's likely fake. Thread Starter 8. Herbert Active Member Nov 20, Joined Nov 26, Messages Likes Joined Nov 24, Messages 6 Likes 2. Great job! Glad to see the measurements cause I bought one and it has no measurements provided by the seller. Herbert Active Member Nov 24, Google did not help: Where are they for sale?
Herbert said:. Last edited: Nov 24, I did so before asking. Did it again now, sorting by price using options "New" "Buy Now" and "Worldwide". Did not show up. Then searched only for A without any option.
It does now show up, though it is new, sold worldwide and an buy now article. Markings are: On the left: Vertically printed"Taiwan" where you can see a white stripe in the pictures above followed by the Philips logo. No explanation of the markings in the datsheet, "Dutchaudioclassics" or "Diyaudio". Nov 24, Thread Starter But as the DAC seems to measure well, it would be interesting if Philips got the production run well enough to omit the crown markings at one point Herbert Active Member Nov 25, I think early production before sounds better, especially those dated and with Y, Y means development according to Dutchaudioclassics, very early production.
I have one and two 2 Y recently bought from Greece. Their performance is consistent with the data sheet. The crown cannot be omitted. As your TDAs were placed on synthetiic cloth for the photo, I hope tey still are up to the norm Hard to believe that earlier batches sound better, as a lot of experience was gathered and the process better controlled over the years Maybe the uncrowned from are as good as double-crowns from Veri Major Contributor Nov 25, Joined Feb 6, Messages 4, Likes 4, Herbert Active Member Nov 27, So the "old wine" analogy does not fit here - again, as always with Hifi You must log in or register to reply here.
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Overview Philips TDA1541 based cdplayers and D/A converters
The is a monolithic integrated dual bit digital-to-analogue converter DAC designed for use in hi-fi digital audio equipment such as Compact Disc players, digital tape or cassette recorders. Features Selectable two-channel input format: offset binary or two's complement Internal timing and control circuit TTL compatible digital inputs High maximum input bit-rate and fast settling time. AD : 2. Monolithic Construction Fast Conversion: 5. The ADC ADC are bit delta-sigma analogto-digital converters using 64 c oversampling 12 MHz A 5th-order comb filter and a tap FIR decimation filter are used to achieve an output data rate to kHz The combination of oversampling and internal digital filtering greatly reduces the external anti-alias filter requirements to a simple. Internal calibration circuitry corrects linearity and offset errors to maintain the full rated performance over the operating temperature range without external adjustments. The capacitive-DAC.
In praise of the Philips TDA1541/A/S1/S2 chips.
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Measurements of TDA1541 by Cyxchen
Certainly it applied ten years ago in the case of the Philips engineers working on the development of the Compact Disc system. Given a specification that had included a bit data word length, they had duly developed a bit DAC chip, the TDA, only then to be informed that the CD standard decided upon after Sony joined forces with the Dutch company would involve bit data words. Thank goodness! Philips having already committed the bit design to silicon, they would not have a bit DAC ready in time for the medium's launch in the Fall of They were thus faced with the problem of squeezing four times the resolution from their existing bit DAC. The result was an ingenious digital filter that combined 4x-oversampling and noise-shaping—the latter is effectively a digital feedback loop, the error produced when the filtered digital data are truncated to 14 bits being fed back to the beginning—to give a digital system with full bit resolution. Philips's true bit DAC chip, the TDA, followed in , but the seeds of ingenuity had obviously been sown: if the combination of oversampling and noise-shaping can increase the resolution of a DAC using too few bits, then why not go all the way and implement a system that used a simple 1-bit DAC and make up for the shortfall in resolution by taking the oversampling, noise-shaping process to the limit?
Lampization of the TDA chip