For being short answers they do open doors rfbw Â¡Â¡.
I'd still need to read on (and on and on) the various app notes, datasheets and related papers. So far the best candidate looks like it is TAS3103A...
However as the info settles together, I am also realizing quite a better picture about DSP digital amplification, which I understand still needs resampling, though looks much better than Digital/analog convertion, if given the choice.
If Ti products here are indication of what has been recently happening in the audio processors industry, its no wonder that back at 2000/1 the DJ Digital mixers opted for the analoge gain stage at their inputs...
Around that time, I exchanged emails with the Redsound people and they said that the best choice would be to bypass the Trim stage altogether.
Took me a long road to understand a little of what has happened...
The first two chips of this Ti family were only released back at March/April 2001(judging from the datasheet date).
.::TAS3002 works with 16-24 bits and 44-48KHz data, has Data processing at 32 bits and DACs at 24 bits.
.::TAS3004 works with the same resolution and bits, and has the same DSP capacities except it also allows for a stereo analog output, where 3002 mixes both channels into a subwoofer monoaural out.
These ICs main job is to equalize, loudness and vol control in the digital domain, the EQ may be bypassed, plus the DAC out could? be used for a preEQ metering.
TAS3103 came out at Feb2004, looks like a revamped version of the previous chips. Processes at 48 bit and uses Infinite IIR filtering(16), since Tas3002/4 units doesnt say, I assume the later use FIR instead or less filters. Hence all indicates this new "3100" line sounds better.
Plus support 8-98 KHz sample rates, 4 inputs, 3 outputs serial, VU metering output, soft mutes/unmutte,etc.
It looks much more developed, though its controlling is done with specific software and might be complex to do/program???. It does talk of it as being fully configurable and a (PC) GUI-based software development package that is available...
TAS3103A released at Feb2006 looks in the datasheet as the perfect candidate of the four. it has plenty of inf support and evaluation boards,
same capacities as TAS3103, with two years of experience...
However the difference between both is in the errata info Â¡Â¡Â¡
After reading the both TAS3103 and TAS3103A erratas PDF. I just can't believe what I've read there.
Actually it is not just that the best and newest IC of the line(TAS3103A) has possible gross malfunctioning, but learning that ALL of the released Ti chips in this line of product have consistent errors.
I did know that digital equipment sometimes(usually because of weird electric feed)behaves strangely and has to be reset to get it well functioning again. I also did know that comercial software has to be patched and upgraded often because of bugs, as I know about jitter into digital sound as a manegeable error between certain boundaries, also the notion that ICs have a % of errors increasing with temperature...
But i didnt expected to find that chips like this could be rendered unuseful while at work and hence force the device to be reset: I just hope that "a device reset" means a power off/on of the whole machine.
///////////////Ok, that learnt, I will concentrate here on the latest/best one from Ti, to find out if -yet- this choice is too risky or not... as only a few months after its release have passed and there is already a problem found. What else could come later? though the two years of experience might count in its favor. Maybe this addition needs a dedicated on/off switch, just in case, so the rest of the mixer keeps on functioning while reseting the chip
The errata PDF mentions that a change in the MCLK, if it is restarted, stopped or the frequency changes, the chip goes into indeterminate state.
As system impact it says that I2S communication stops(control stops functioning?) and the device might not operate correctly
Since the chip has many operations it may be the case that the volume is not compromised...
As a workaround it only talks about reseting the device when any of that change in the MCLK occurs.
And so before getting into the actual implementation, questions arise...(and please anyone correct me here -even- at formulating the questions, I do have good intentions and try to put up a good effort, but no grounds to back them): If the clock is taken from the source(has master/slave), when the CD player stops(because the user wants to change the CD, -which happens plenty of times with a mixer-)then the MCLK stops in the sense the errata mentions? Is the case that are there alternatives to set the master clock in a more stable configuration? I guess the change in freq, might not be a problem since the gear to connect to the mixer's added-input-board, would be plugged-on from begining to end of the session.
It does look like a Ferrari though.