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True Digital Audio Amplifier (TDAA)
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Old 25th July 2003, 09:49 AM   #1
DJ is offline DJ  South Africa
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Default True Digital Audio Amplifier (TDAA)

I'm seriously considering to design and build speakers with one TDAA (based on TI's chips) per driver and one "active" digital crossover (implemented by TI's TAS3103 digital audio processor) per speaker. This way I can endlessly (well nearly) tweak the crossover for the best response in my listening room.

Also, it should have less distortion overall than a conventional setup, because the audio signal only becomes analog when it's almost in the driver.

The idea is to then have one audio data cable carrying the digital audio data to each speaker, and one control cable from a central control box controlling volume etc for each speaker. This setup also eliminates the need for a separate DAC/s.

Any suggestions (or advice) are welcome. Anyone interested in doing the same or taking part in the design should also feel free to post a reply.


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Old 25th July 2003, 03:33 PM   #2
MWP is offline MWP  Australia
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Look in this recent thread:

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Old 25th July 2003, 09:05 PM   #3
ojg is online now ojg
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I have also been thinking about using the TAS3103 for a digital x-over. Two TAS3103 controlled by an Atmel AVR with RS232 connection to PC should make a nice stereo 3-way x-over.

S/PDIF receivers (DIR1703) could be included on the board and just use i2s outputs. The hardest part is the software, depending on how fancy one would like to make it.

The TDAA is outside my field of interest for the moment, but that may change

I don't have much time for DIY in the summer, but I could always join in on the thought process
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Old 26th July 2003, 10:28 PM   #4
DJ is offline DJ  South Africa
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MWP, that thread is not very close to what I plan at all. There is a fairly huge difference between a TDAA and a "conventional" digital amp. Thanks anyway.

ojg, thanks for the offer, I'll be sure to call your help in if I run into a problem. As they say, two brains are better than one.

I have ordered samples of the following from TI:
TAS3103 - for the digital crossover as mentioned
TAS5015 - for converting PCM samples to PWM
TAS5111 - output/power stage (perhaps I'll still go discrete)
PLL1708 - for accurate clocks
DIR1703 - for receiving SPDIF

I've also started drawing block diagrams for the design. Can't wait to "get my hands dirty" though...

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Old 4th April 2004, 10:26 PM   #5
Rarkov is offline Rarkov  England
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...and did you get your hands dirty?

Did you try the TAS3103...What were your impressions. Easy to use, sound etc etc?

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Old 4th April 2004, 11:13 PM   #6
TNT is offline TNT  Sweden
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Clock distribution is the challenge or cost depending on strategy !

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