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Class D Switching Power Amplifiers and Power D/A conversion

STA350BW - Quite interesting
STA350BW - Quite interesting
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Old 17th May 2011, 05:17 PM   #1
Shatronics is offline Shatronics  Denmark
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Join Date: May 2011
Default STA350BW - Quite interesting

Hello DIY'ers,

I have just received a email from ST Microelectronics about their new class-d amplifier with digital audio processing on chip.
I must say: It looks quite interesting for a compact amplifier solution.
Please take a look

STA350BW - STMicroelectronics


Simon H.A.
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Old 19th May 2011, 10:12 AM   #2
studiotan is offline studiotan
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Join Date: Apr 2011
Default Forget STA350BW


(I'm french)

you have to purchase at least 1000 units....

There are no samples...

it's a "DDX" ternary techno with crossover

I hope we can snatch these chips, i think so

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Old 22nd August 2011, 06:14 PM   #3
jtrantow is offline jtrantow  United States
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Now available in single quantity. (digikey)
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Old 23rd August 2011, 08:37 AM   #4
trevmar is offline trevmar  United States
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Join Date: Jan 2011
A fascinating chip, 8 biquads per channel is enough. But darn! I just purchased a spare miniDSP this week This chip would be ideal for my new suitcase-portable system...

I see the heatsink is facing down to the PCB, that is bad - this is intended for low-power applications only. Additionally, the distortion is high, rather like the TDA7498 I just struggled with for so long, just trying to achieve the results published on their data sheet.

The chip is the same (tiny) size as the TDA7498. Just a barely adequate HiFi power amplifier. Not audiophile.

I also note that there is no distortion vs frequency curve given. This was the area where the TDA7498 got into real trouble, with excessive distortion above 1KHz.
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Old 23rd August 2011, 10:18 AM   #5
trevmar is offline trevmar  United States
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Join Date: Jan 2011
Actually, this new ST product range is looking quite interesting. They are obviously going after compact HiFi and active speakers in a big way. The STA350 can drive two stereo speakers plus a subwoofer, two stereo channels, or a mono channel. Quite a nice idea, this 'FFX'. Here is the press release: STMicroelectronics News: STA350BW Sound Terminal 2.1-channel high-efficiency digital audio system

They are consumer chips, but the Application note provided the data I was looking for, and the performance is actually much higher fidelity than the TDA7498. I attach the distortion vs frequency curve below.

The DSP is 24-28bit, less than the 48 bits of the MiniDSP, but probably adequate for their target market.

So where do I buy an application board? Where do I get the GUI control software they talk about in the application note? I have an application ready to drop this chip straight in
Attached Images
File Type: gif THD_vs_Distortion_STA350.gif (43.5 KB, 314 views)

Last edited by trevmar; 23rd August 2011 at 10:34 AM. Reason: typo
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Old 23rd August 2011, 11:01 AM   #6
trevmar is offline trevmar  United States
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Join Date: Jan 2011
Information on the APworkbench software is at:
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