CSRA6620 looks promising, and unlike Zetex this one is a single-chip solution.
As I see I can buy CSRA6620 for about $5 from Arrow, however, Qualcomm makes from that chip a military-like secret. Any ideas?
Documentation | CSRA6620 | Qualcomm
As I see I can buy CSRA6620 for about $5 from Arrow, however, Qualcomm makes from that chip a military-like secret. Any ideas?
Documentation | CSRA6620 | Qualcomm
Hi IVX!
Very interesting chip.
To access the documentation, you need to be a company and sign an NDA
Very interesting chip.
To access the documentation, you need to be a company and sign an NDA
not only, they simply refuse your request if you are not big enough. I did ask some US company to help me to get app info but Qualcomm refused their request as well.
drMordor, so just to pay for $6000 Arrow and get 1KU of CSRA6620, next praying for pdf? Nice ))
Actually, I suspect CSRA6620 not so good as we can expect. Seems THD+N at 6kHz .01%, and no any details regarding the load used.
Actually, I suspect CSRA6620 not so good as we can expect. Seems THD+N at 6kHz .01%, and no any details regarding the load used.
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Here's the data sheet for CSRA6620 board ? maybe.
Look for the 1.22mb attachment link near bottom of page. Full Range Amp with Switching Power | Taiwantrade.com
Look for the 1.22mb attachment link near bottom of page. Full Range Amp with Switching Power | Taiwantrade.com
stuartlew, ok but there are no more details that Qualcomm gave in thier breif. I would like to see THD vs power sweep, and THD vs frequency sweep at -3db and -20db, Zout vs freq. I can see in the pdf you reffered that SNR(-105db or -108db(A)) and THD+N(.01%@1kHz@-3db, perhaps close to .1% at 6.3kHz) noticeable worse than Quallcomm promised.
But it's also a very different layout from the evaluation module, impossible to say for sure.
The Taiwantrade board also has onboard PSU.
Shame the evaluation kit is so pricy (800$), most developers will probably prefer the TAS3251 since that eval kit is only 249$ and it has more features(?).
https://www.ti.com/store/ti/en/p/product/?p=TAS3251EVM
Interesting controller. Made mostly to save BOM cost, nothing a x1 32bit MCU and x2 IRS2093MPBF cannot do.
I can only imagine what that meeting looked like when the engineering R&D group pitched it to the black suit in the meeting room. This is purely made for high high "volume" customers 😀, Qualcomm is not in the business dealing with us small fry.
I can only imagine what that meeting looked like when the engineering R&D group pitched it to the black suit in the meeting room. This is purely made for high high "volume" customers 😀, Qualcomm is not in the business dealing with us small fry.
thank you for the input, however, it is far not enough without internal registers description. As I see, the chip actually doesn't take FB from the output directly, only like a mix before/after output filter. I have tried Ti TPA3251 with similar "FB after LC", that chip shows about Ok THD at the resistor load but at the real speaker load THD drops to .05% anyway even at 1kHz + awful clipping.