[sdiy] Low voltage synthesis?

Mike Bryant mbryant at futurehorizons.com
Fri Jan 14 12:19:22 CET 2022


Cut out the middle bit :-)

BD28623MUV<https://www.rohm.com/products/audio-video/audio-amplifiers/speaker-amplifiers/bd28623muv-product>

These modulate the PDM directly from the I2S input, so there's no analogue on-chip at all.

TI, ST, NXP and Infineon have similar parts for different power levels.


From: Tom Wiltshire [mailto:tom at electricdruid.net]
Sent: 14 January 2022 10:27
To: cheater cheater; cheater cheater via Synth-diy
Cc: Mike Bryant
Subject: Re: [sdiy] Low voltage synthesis?

I'd guess:

DAC -> Class D amp -> Outside world.

Not a lot of scope for noise in that very short signal chain.



On 13 Jan 2022, at 23:45, cheater cheater via Synth-diy <synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org>> wrote:

I wonder what's being used in places like
mobile phones or wireless earbuds for example, they can't be running
+/-5V op amps or LV op amps with major crossover distortion.

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