USB Audio Interface Setup

flux

I found a few good references with visibly inspectable PCB layout around the codec and USB connector.
Best matches

Table

ProjectWhy it’s usefulWhat looks promisingLink
erichVK5/PCM290x-USB-audio-interfaceClosest to a simple stereo USB codec designOpen hardware repo with PCB files, likely easiest to inspect codec-to-USB routinghttps://github.com/erichVK5/PCM290x-USB-audio-interface
skiselev/usb_audioCompact USB audio adapterGood candidate for studying connector placement and short codec routinghttps://github.com/skiselev/usb_audio
Flux reference: USB audio dongle PCM2912Directly relevant to your architectureViewable schematic + PCB in Flux/psuser2024/usb-audio-dongle-pcm2912
Wayne-Weng/-PCB--PCM2912-USB-Codec-with-MEMS-MICSpecifically PCM2912-basedStrong match if you want to compare codec neighborhood and USB entryhttps://github.com/Wayne-Weng/-PCB--PCM2912-USB-Codec-with-MEMS-MIC
UCSD open-source USB audio interface PDFIncludes PCB discussion in a readable documentGood for layout rationale, not just raw fileshttps://kastner.ucsd.edu/ryan/wp-content/uploads/sites/5/2022/06/admin/usb-audio-interface.pdf
Most relevant to your design
For a MacBook Air bus-powered interface like yours, I’d start with:
  1. erichVK5/PCM290x-USB-audio-interface
  2. Flux PCM2912 project
  3. Wayne-Weng/-PCB--PCM2912-USB-Codec-with-MEMS-MIC
What to inspect first

Table

AreaWhat to look for
USB connector entryESD part placement, CC resistor placement, VBUS filtering
USB D+ / D- pairShort path, minimal stubs, consistent spacing, direct route into codec/protection
Codec neighborhoodDecoupling capacitors very close to supply pins, crystal placement, clean ground return
Analog separationInput/output traces kept away from USB pair and VBUS switching/current loops
GroundingContinuous ground reference under USB and codec, controlled analog return paths
If you want, I can do the next step and make a reference-by-reference layout comparison checklist for your current project.
Compare those references
Review my layout
Inspect board first
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U2 EN - C11 P1
U2 EN - C11 P1
U1 VCCR - U1 VCCP
J1 VBUS_4 - D1 VBUS
U2 EN - C11 P1
U2 VOUT - U3 V+
U2 EN - C11 P1
U1 DGND - U1 AGND
U1 DGND - U1 AGND
C11
Capacitance
10uF
C13
Capacitance
10uF
U1 DGND - U1 AGND
C15
Capacitance
10uF
C14
Capacitance
10uF
C12
Capacitance
10uF
U1 DGND - U1 AGND
U1 DGND - U1 AGND
U2

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