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todbot / pico_test_synth

Simple board to help make synths with Raspberry Pi Pico and PCM5102 I2S DAC
MIT License
18 stars 1 forks source link

You might review the PCM5102 Supply Voltage Requirement #2

Open jake653 opened 2 months ago

jake653 commented 2 months ago

(I mentioned elsewhere) The board has 2 - 3.3V regulators, providing better noise isolation for audio section. Sourcing the board with 3.3V will provide somewhat insufficient voltage and less noise reduction. The MicrOne brand ME6211 voltage regulator specs mentions the LDO regulator has a 100mV dropout (@100ma and adequate source voltage) their regulator performance specs are with a 4.3V source. The PCM5102 should be more stable with 5V vin., it's logic interfaces are all 3.3V compatible. TI specifies their PCM5102 chip operating voltage range is Min 3.0, nom 3.3, max 3.6 Probably worth measuring the onboard regulator outputs in your circuit.

todbot commented 4 weeks ago

Thanks. I think you're right. Before I do another run of these boards, I'll test and make changes.