Looking for TAS5100

[Markus2006]

I have quite interesting project of "PurePath Digital" class-D amp but in order to complete it, I need TAS5100 (2 pcs), which is not produced any more by TI. Has anyone got it as a spare part from good, old times?

Marek

 

[Gorilla]

I'm quite sure the TAS5100 series are active. A mate of mine got samples recently (I can't remember of what chip exactly tho). If the specific chip your after is not active you could easily find a suitable replacement within the range.

Even with their latest TAS5261, cause a project done with one of these would be great to see.

 

[Markus2006]

Thank for for your optimism but I'm affraid it's not that easy. TAS5100 is not active any more. Suggested replacement is TAS5111 but it is not compatible with the previous one. I may end up with a new chip but then I need a new board. I'm still counting that someone has old samples.

Marek

 

[thomaseliot]

Hi Markus,

I'm very interested to your TAS5010 PCM-PWM modulator device. Have you a pcb or can you share your project?

I'm in with a group buy for TAS5261 TI Equibit power stage. But it has analogue input. Could your input stage be compatible with TAS5261?

Ciao

Thomas

 

[Markus2006]

Thomas,

The device consists of a preamp (build with DIR1703 and TAS3004), and a power amp (build with TAS5010 and TAS5100). These are two boards and currently what I still don't have are two TAS5100. Most probably I will build power amps based on TAS5261 (see a thread about it) and connect the amps to my board. Im not sure whether I can publish the schematics because both boards were published just few moths ago in Polish magazine "ELEKTRONIKA PRAKTYCZNA" (Practical Electronics). But it is possible that they will be selling the boards (unfortunatelly without chips). Also DIR1703 is very difficult to obtain but it can be replaced with DIR1701. I can ask them about the boards if you want.
Of course, I hope that TAS5010 can be connected to TAS5261 - I have to read the datasheets.

Regards,
Marek

 

[thomaseliot]

Hi,

I'm already on the group buy list for TAS5261. But I'd like a pure digital amp. So I'd like your board with TAS5010: have you one board left to sell?

As pre I will use a PC with I2S output sound card, or a PCM2707 board I have with USB.

I have a couple of questions: what microcontroller do you use for volume control? And what power supply?

I know that Equibit amps need very stable PS and TI recommends power supply volume control.

Ciao

Thomas

 

[FastEddy]

The '5100 is obsolete = TI data: http://focus.ti.com/lit/ds/symlink/tas5111a.pdf

TI's replacement: http://focus.ti.com/lit/ds/symlink/tas5111a.pdf ... not totally functionally equal, but better specs ...

I just this morning received my two '5261 chips from TI ... ordered directly from TI = chip samples on line. (I probably should have just gotten the eval board: http://focus.ti.com/lit/ug/slau193/slau193.pdf )

It appears that all of the major functionallity of the '5100 is in the '5261 ... maybe not enough for your purposes. My plan was to hook it to a FireWire 1394 hub chip somehow and try to make a 24 bit/96k / I2S input ... to 50 watts or so out ... but I'll bet I have to get some more chips and advise from TI or elsewhere.

 

[Markus2006]

Hi,
I'm already on the group buy list for TAS5261. But I'd like a pure digital amp. So I'd like your board with TAS5010: have you one board left to sell?
As pre I will use a PC with I2S output sound card, or a PCM2707 board I have with USB.
I have a couple of questions: what microcontroller do you use for volume control? And what power supply?
I know that Equibit amps need very stable PS and TI recommends power supply volume control.

Thomas,
I don't have spare boards but they promised to manufacture few boards which will be available within 2-3 weeks. If you want, I can buy one for you. But please be aware that, since TAS5100 are not available any more, you will use only small part of it - related to TAS5010 and the rest (70%) will not be used. Unless you decide to assemble the output filters on that board. The power amp board does not contain any volume control - it recieves digital signals from the preamp. I'm also not sure what you mean by "power supply volume control" (could you explain the term "Equibit"?).
The second board is a preamp build with DIR1703, TAS3004, PIC18F252 and MAX202 (and a LCD display). TAS3004 is the volume control (it also contains analog inputs). Power supply of the preamp is +5V and of the power amp is +3.3V and +26V.

Marek

 

[Markus2006]

The '5100 is obsolete = TI data: http://focus.ti.com/lit/ds/symlink/tas5111a.pdf
TI's replacement: http://focus.ti.com/lit/ds/symlink/tas5111a.pdf ... not totally functionally equal, but better specs ...
It appears that all of the major functionallity of the '5100 is in the '5261 ... maybe not enough for your purposes.

I hope that they have exactly the same functionality. The only problem is that I have already the board and of course footprints of each of them are different.

Marek

 

[FastEddy]

" ... I hope that they have exactly the same functionality. ..."

Almost certainly not ... TI says as much in their web pages.

 

[thomaseliot]

Hi Marek,

Equibit is a patented technology by Toccata Denmark, licensed to Texas Instruments that bought Toccata some years ago.

Equibit is a whole digital amp with no feedback, that is that power stage input is a digital stream and output is another digital stream directly connected to speakers: no signal "goes back" to the amp to say what's happening in the real world (speaker).

This also means that power supply variations are reflected entirely to speakers. So PS must be very well regulated and precise, in the order of less than 50mV tolerance.

In a digital amp there is no way to implement an analogue pot. Your solution with TAS3004 is a DSP volume control: it performs mathematical transforms of pcm to modify amplitude of resulting sine waves. Is the same volume control of PC sound cards.

Unfortunately with this method you get much lower resolution of sound, at normal moderated sound levels.

So TI recommends to control the amp volume with a variable power supply: Tact millennium amp (that uses Equibit) use this technique.

Have you a picture of 5010+5100 board?

Ciao

Thomas

 

[Markus2006]

Fast Freddy,

What I need from TAS5261 is that it: "supports Pulse-Width Modulation (PWM) Frame Rates of 192 kHz to 384 kHz". Hopefully, this will allow for connecting it to TAS5010.

Marek

 

[Markus2006]

Thomas,

Thanks for explanations. Now I understand the issue with variable power supply. Such a power supply is not used in case of my amp. Can you point me to TI recomendations regarding this? There could be some application shown.
I don't have pictures of my boards but here: http://www.ep.com.pl/archiwum/07-2006.jpg
you can see how the preamp looks like (at the bottom of the picture). The power amp looks similar (just without LCD).
And here you could actually download the article (first item on the PDF list):
http://www.ep.com.pl/?strona=archiwum.php&r=2006&m=7
but it requires some access code, which you can get by sending a SMS - I never used it and I don't know whether it will work from Italy.
Not long ago there was a reference to similar method on this forum.
It was a thread about EEEngine. Its it what you are talking about?
http://www.diyaudio.com/forums/showthread.php?s=&threadid=88710
and more information from Yamaha:
http://www.yamahaproaudio.com/topics/leading_technology/archives/learn_more_about_eeengine.html

Marek

 

[thomaseliot]

Look this post:

http://www.diyaudio.com/forums/showthread.php?postid=1043870#post1043870

The reference variable power supply from TI is here:

http://focus.ti.com/lit/an/slea038/slea038.pdf

There is an evaluation board from TI with TAS5518+TAS5261 (TAS5518 is the 8 channel version of your 5010):

http://focus.ti.com/docs/toolsw/folders/print/tas5518-5261k2evm.html

Here you'll find complete documentation, user guide and gerber files for the board.

I got some TAS5518 from TI, if you are interested.

 

[Markus2006]

It looks like power supply is very important for TAS5261. But the evaluation board does not contain one. The power supply seems to be to complex for me at the moment.
Do I understand correctly that TI used TAS5518 with 8 channels and TAS5261 with just two outputs on the evaluation board? What happend to the other 6 channels ?

Marek

 

[thomaseliot]

The evaluation board for 8 channels is here:

http://focus.ti.com/docs/toolsw/folders/print/tas5518-5152k8evm.html

in the two ch one, six channels are unused.

Yes, ps is complex enough. It must be a very stable SMPS.

 

[Markus2006]

I'm not sure about the term "stable". It seems to me that the required voltage is calculated based on current power module requirements (either by TAS5518 or dedicated microprocessor), and the output SMPS voltage is changed accordingly. So the voltage changes. I have to read posts by Kim (it's a pitty that he has no time to check this thread - he may be the guy who has TAS5100 ).

Marek

 

[BWRX]

I'm in with a group buy for TAS5261 TI Equibit power stage. But it has analogue input. Could your input stage be compatible with TAS5261?

The board I made has two chips, the TPA2001D1 and the TAS5261. The TPA2001D1 accepts an analog input and will output the PWM signals to control the TAS5261 output stage. Any 0-3.3V PWM signal can be used to control the TAS5261.

Of course, I hope that TAS5010 can be connected to TAS5261 - I have to read the datasheets.

Of course it can. As I said in the TAS5261 thread, I have supplied PWM inputs on the board to jumper in external PWM signals - the same PWM signals your TAS5010 would send to the now obsolete TAS5100.

 

[thomaseliot]

Hi Brian

what do you think about Marek's TAS5010?

When finished with your 5261 board we could try this and build our TACT millennium digital amp.