Nice layout doctor mord. I can see that you have made line length matching. Impedance match as well? 
I do have the licenses from TI. It takes a week to get. To use them you well need to have the EVM board before being able to do header files export. But the PCM5242EVM is not that expensive.
I have got different EVM boards here. TAS5624A, TPA3251A, TAS5548 and PCM5242.
The TAS5624A and TAS5548 stuff is mostly that some of my customers believes it is better to stay in the Digital domain than going to Analog domain and use TPA325X series.
But a bad layout in the digital domain where we send the PCM can destroy the performance to a lot worse than TPA325X.
I am glad that you use Wurth inductors. They are really good and as the TI application note points out, they perform well.
BR
Sonny
I do have the licenses from TI. It takes a week to get. To use them you well need to have the EVM board before being able to do header files export. But the PCM5242EVM is not that expensive.
I have got different EVM boards here. TAS5624A, TPA3251A, TAS5548 and PCM5242.
The TAS5624A and TAS5548 stuff is mostly that some of my customers believes it is better to stay in the Digital domain than going to Analog domain and use TPA325X series.
But a bad layout in the digital domain where we send the PCM can destroy the performance to a lot worse than TPA325X.
I am glad that you use Wurth inductors. They are really good and as the TI application note points out, they perform well.
BR
Sonny
Nice layout doctor mord. I can see that you have made line length matching. Impedance match as well?
Data lines all have single series "termination", masterclock is series terminated ("impedance matched") at source and all sink points.
Well, i wouldn't call them any better than the usual oem stuff, as Wurth only "rebrands" - you mainly pay for their R&D + QS. You can get the same performance from "cheaper" parts, you just have to find them and deal with the tolerances.
The other point with Wurth is, they sell from qty 1+. (Not i.e. 1000 min qty)Ever heard of Codaca?
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In china they have 3 factories, in different cities than Codaca, but some of the inductors (I used) are made in thailand, those bodies look like some of Codaca inductors too.
Also the big inductors in first pictures, that coilcraft also sells, the wuerths have black lacquered body, inside and outside, I don't think they take a complete inductor, take it apart and paint and reassemble it. The "rebranding" of oem parts would suggest that??
Also the big inductors in first pictures, that coilcraft also sells, the wuerths have black lacquered body, inside and outside, I don't think they take a complete inductor, take it apart and paint and reassemble it. The "rebranding" of oem parts would suggest that??
Wurth is not manufacturing anything on their own, they put their name on it and care about R&D, QC, QS and distribution channels.
Of course, they wont take inductors apart to pain them. They have their contract manufacturers to make the products. What i wanted to say is, inductor making is no "rocket science". You can buy cores, wires and the machine. If geometry, core material, flux, wire diameter etc. is the same, their wont be any difference in performance.
Regarding the Codaca indutors, i have those shown on the first picture. They are mechanically equivalent to the Wurth, inductance differs a bit (7uH vs 6u8H nominal). Also they are wound "mirrored" compared to the Wurth and without painting on the outside.
Of course, they wont take inductors apart to pain them.
They have their contract manufacturers to make the products. What i wanted to say is, inductor making is no "rocket science". You can buy cores, wires and the machine. If geometry, core material, flux, wire diameter etc. is the same, their wont be any difference in performance.Regarding the Codaca indutors, i have those shown on the first picture. They are mechanically equivalent to the Wurth, inductance differs a bit (7uH vs 6u8H nominal). Also they are wound "mirrored" compared to the Wurth and without painting on the outside.
Number of turns the same for Codaca and Wuerths ? The coilcraft version has different amount of turns, so different core. And like I said bodyparts look painted on inside too.
Yes I think they all buy same bodyshape outside shell of inductors.
Production Plants | Wrth Elektronik: Electronic & Electromechanical Components - Standard Parts > About us > Production Plants
Yes I think they all buy same bodyshape outside shell of inductors.
Production Plants | Wrth Elektronik: Electronic & Electromechanical Components - Standard Parts > About us > Production Plants
The pictures are just examples.
In this case, the Codaca 6u8H is 11 turns, while the Wurth 7uH is 9 turns, BUT, i have a measurement plot for the 7uH Wurth which measured just 6u2H (Plot made by Wurth).
So there is:
Wurth: 6u2H/9 = 0.689uH/t
Codaca: 6u8H/11 = 0.619uH/t
Little bit different.
In this case, the Codaca 6u8H is 11 turns, while the Wurth 7uH is 9 turns, BUT, i have a measurement plot for the 7uH Wurth which measured just 6u2H (Plot made by Wurth).
So there is:
Wurth: 6u2H/9 = 0.689uH/t
Codaca: 6u8H/11 = 0.619uH/t
Little bit different.
No, the TPA3132 measurements were only done for filterless and ferrite+C filters. Never used "real" inductors with the 3132 chips.
For a difference between 3132 and 3251/5 .. haven't done a (direct) comparison yet.
We had done measurements for different inductors on the 3251 boards, thd varies with inductors and coupling caps.
(But we need to do some measurements again, as there were problems with the AP analyzer. So the EVM didn't measured like specs shown in the manual.)
Do you want to see any specific measurement? Maybe i have a proper plot.
For a difference between 3132 and 3251/5 .. haven't done a (direct) comparison yet.
We had done measurements for different inductors on the 3251 boards, thd varies with inductors and coupling caps.
(But we need to do some measurements again, as there were problems with the AP analyzer. So the EVM didn't measured like specs shown in the manual.)
Do you want to see any specific measurement? Maybe i have a proper plot.
Do you have filterless tpa3132 thd graph with same equipement/more or less same conditions (comparable gainsetting/noiselevel) as your big coilcraft inductor tpa32xx graphs. I was wondering how different that would look. I think datasheet tpa3132 shows full outputfilter thd graphs, because frequencyrespons 8 ohm has some peaking.
graph with same equipement/more or less same conditions (comparable gainsetting/noiselevel) as your big coilcraft inductor tpa32xx graphs. I was wondering how different that would look. I think datasheet tpa3132 shows full outputfilter thd graphs, because frequencyrespons 8 ohm has some peaking.
No, i'm sorry.
The only graphs i actually found where FFT plots for "filterless" (Ferrite+C) and 47uH+220n classic filter. (both into 8R+47uH)
"filterless":
LC-Filter:
THD vs. F (no load) is pretty much like datasheet. (filterless)
The only graphs i actually found where FFT plots for "filterless" (Ferrite+C) and 47uH+220n classic filter. (both into 8R+47uH)
"filterless":
LC-Filter:
THD vs. F (no load) is pretty much like datasheet. (filterless)
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Addition:
Comparison of different modulators at 12V with no load:
(The MAX9709 is running in spread-spectrum-mode, thats why there's much more modulation. TPA3132 is Ferrite+C, MAX9709 is completely filterless, TA2024 is with standard LC-Filter.)
Comparison of different modulators at 12V with no load:
(The MAX9709 is running in spread-spectrum-mode, thats why there's much more modulation. TPA3132 is Ferrite+C, MAX9709 is completely filterless, TA2024 is with standard LC-Filter.)
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No diodes whatsoever, it's one of the cheap TA2024 boards with those red "audiophool" foil input caps.
Like this: MKll Tripath TA2024 Amplifier Board Module 2x15watt tested Audio Power HIFI NEW | eBay
(No need for tube buffer)
Like this: MKll Tripath TA2024 Amplifier Board Module 2x15watt tested Audio Power HIFI NEW | eBay
The MAX9709 is loved by everyone, maybe due to modulation products resulting from SSM.
(No need for tube buffer)
Data lines all have single series "termination", masterclock is series terminated ("impedance matched") at source and all sink points.
Well, i wouldn't call them any better than the usual oem stuff, as Wurth only "rebrands" - you mainly pay for their R&D + QS. You can get the same performance from "cheaper" parts, you just have to find them and deal with the tolerances.
Ever heard of Codaca?
Exactly würth sells in small qty. And buying directly from them than through a distributor gives you really good prices.
No, i have not heard about them.
- Sonny