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Old 6th March 2006, 02:42 PM   #1
jkeny is offline jkeny  Ireland
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Default New TI digital input audio amplifier

Has anybody seen these new 20 Watt digital Input audio amplifiers from TI - free samples at the moment.

24 bit resolution, up to 200 kHz sampling and I2S digital input.
I'm not an expert but THD looks reasonable only up to about 6 Watts.


Samples oredred - I was wondering about running these from USB to I2S Pcm2707 chip.

Any opinions?

John
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Old 6th March 2006, 02:43 PM   #2
jkeny is offline jkeny  Ireland
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Forgot to add link : http://focus.ti.com/docs/prod/folder...tpa3200d1.html
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Old 6th March 2006, 11:07 PM   #3
BWRX is offline BWRX  United States
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It looks to have performance very similar to the current low power Tripath chips. It certainly has potential, especially if you want to use dsp before the amp.
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Old 6th March 2006, 11:27 PM   #4
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Jkeny - from a quick look at the datasheet, the THD vs power charts reflect a 12V supply, not an 18V supply. Still, you won't get 20 clean watts out of this into 8 ohms even with an 18V supply.

It's somewhat interesting that they didn't build this on their Equibit technology, but seem to be using a more conventional DAC+analog-input modulator. FWIW the Equibit stuff runs quite nicely off battery power as well, although it's obviously a more complex solution with separate modulator/driver/mosfets.
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Old 7th March 2006, 12:25 AM   #5
jkeny is offline jkeny  Ireland
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That's why I like this chips possibility - simplicity.

It also gives the potential to try USB to I2S(PCM2707) to TI amp(TPA3200D1) directly with a simple pathway and 24kHz/192k

I know there is a lot of talk on this and other forums about the jitter of USB - technically it seems to have more but different spectrum of jitter than SPDIF - but concensus(?) seems to suggest that USB sounds better. Nobody disputes the superiority of I2S or do they? Anyway this avoides the use of external DAC and all the possibilities for error in implementation (DAC type, I/V stage, etc). It depends on how good the internal DAC is.

Only element missing is the ability to go non-oversampling. If it had this I'm sure we would all be dooling with anticipation.

If it gives the performance of a tripath with direct digital input I think it could be a candidate for next "chip of the month" - just wonder how it sounds?

John
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Old 9th October 2006, 01:30 AM   #6
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I'm ressurecting this thread. I don't need more than 5-10w, and why bother with a discrete DAC when you can have one built-in that works just as well?
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Old 9th October 2006, 06:40 AM   #7
Gorilla is offline Gorilla  United Kingdom
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Quote:
Only element missing is the ability to go non-oversampling.
Surely oversampling is a good thing?
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Old 9th October 2006, 06:57 AM   #8
peufeu is offline peufeu  France
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The chip contains a DAC and an oldskool PWM digital amplifier with sawtooth comparator. It stands no chance against UcD.
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Old 10th October 2006, 02:58 AM   #9
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Quote:
Originally posted by peufeu
The chip contains a DAC and an oldskool PWM digital amplifier with sawtooth comparator. It stands no chance against UcD.

Perhaps you can reccomend an alternate solution?
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