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[design log] Neat 2x170W I2S in, I2C controlled, integrated DSP amp (TAS3251)
[design log] Neat 2x170W I2S in, I2C controlled, integrated DSP amp (TAS3251)
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Old 20th August 2018, 01:10 PM   #21
IVX is offline IVX  Ukraine
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JMF11, I very first time downloaded tas3251.pdf today before lunch and reading through. The datasheet contents all registers list etc, usually, that is enough to start a project. What kinda extra info you may need?
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Old 20th August 2018, 01:24 PM   #22
IVX is offline IVX  Ukraine
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lutkeveld, I really have no idea what you talking about but TAS5558 allow to update any biquad any time(my app dynamically allocate biquads for parametric EQs ether LPF/HPF 12 or 24db/oct), the only problem seems Ti invented for themselves Fs synced DSP update(to avoid clicks, AD inc. calls that "safe load" mode) in 2018 and that indeed implemented in the TAS3251.
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Old 20th August 2018, 01:48 PM   #23
lutkeveld is offline lutkeveld
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My experience is with the TAS5754M, which uses purepath console 2. Maybe it changed in PPC3. If anyone has used PPC3, please correct me if I am wrong.

With previous devices it was only possible to figure out which biquads were linked to which registers by changing a biquad in the GUI and comparing the register dumps. TI does not provide the registers of the biquad coefficients (or other DSP filters for that matter).

This makes a biquad app more difficult, but not impossible.

Also, you first need to enter powerdown before changing any DSP filter settings. But that can be done in ~300mS so almost instantaneously.

But again, I have not fully read all documents regarding the TAS3251, so I could be wrong. I only have experience with older generation devices.
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Old 20th August 2018, 01:57 PM   #24
IVX is offline IVX  Ukraine
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if it so, that's why AD inc and their Sigma DSPs won )) And because of "comprehensive" support as well. I'm asking and waiting for the answer whole August )) TAS5558: TAS5558 Energy Manager Averaging coefficients - Audio Amplifiers Forum - Audio Amplifiers - TI E2E Community
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Last edited by IVX; 20th August 2018 at 02:09 PM.
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Old 20th August 2018, 02:17 PM   #25
lutkeveld is offline lutkeveld
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That is exactly true!

It is not that big of an issue when you are a manufacturer, because you can copy your settings over thousands of products. However, for the DIY market where people want to experiment without spending a lot of money and time, SigmaStudio is the clear winner.

If TI publishes the register maps (or somebody reverse engineers it) it should be possible to make a GUI like SigmaStudio which can change parameters real time. Or some other way to use PPC3 without the EVM.

That would be ideal for the DIY community; hooking up a TAS3251 board via USB, figuring out the wanted parameters and then programming the microcontroller with the header file so it can run stand-alone.
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Old 20th August 2018, 02:24 PM   #26
IVX is offline IVX  Ukraine
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Or better GUI than Sigmastudio YouTube
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Old 20th August 2018, 02:31 PM   #27
TNT is offline TNT  Sweden
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Make a really small version? Maybe limited to say 50watt?

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Old 20th August 2018, 02:43 PM   #28
lutkeveld is offline lutkeveld
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@TNT
I made a PCB based on the TAS5754M that will be released in the near future:
-DSP (biquads, smoothclipping, bass enhancement, limiters etc)
-2x40W or 1x80W class D amplifier
-Bluetooth v4.2 class 1 module

There are some early versions being tested by early adopters and it looks very promising. Once I am ready to sell I will make a dedicated thread. Do not ask too much questions in this thread, I do not mean to hijack this. More so to show what is possible with these kinds of chips.
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Old 20th August 2018, 03:15 PM   #29
JMF11 is offline JMF11  France
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Quote:
Originally Posted by IVX View Post
JMF11, I very first time downloaded tas3251.pdf today before lunch and reading through. The datasheet contents all registers list etc, usually, that is enough to start a project. What kinda extra info you may need?

For me, it is not (yet) complete: I do not see the registers to configure the biquads, and other functions from section 8.5.1 about the DSP programming.


There are a lot about the PLL config, DAC contro, volume. But it seems to me that they are not all here, unfortunately.


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Old 20th August 2018, 03:19 PM   #30
TNT is offline TNT  Sweden
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Quote:
Originally Posted by lutkeveld View Post
@TNT
I made a PCB based...
OK + interesting!

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