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Circuit Atlas · HUSH M4 · Rev 2027.4 draft

S10 USB-C interface (optional tap)

Schematic for S10 USB-C interface (optional tap). Design targets and calculations, no measurements.

IN DEVELOPMENT · REV 2027.4 (DRAFT) · DESIGN TARGETS, NOT MEASUREMENTS

HUSH M4 is in development. This draft is published on zakkhutoretsky.com; it has no price and no ordering. Figures marked design target are goals for the finished product. Figures marked calculated come from the published formulas. No value on these pages was measured on a built unit. Interviews are cited as the design brief, not as an endorsement.

See this control USB-C on the mixer page

S10 USB-C interface (optional tap)

USB-C 32-bit float interface (optional tap)Four channel taps and the master pair pass through buffers into two four-channel ADCs, which feed a USB Audio Class 2.0 device controller on a USB-C connector. A separate DAC set returns host audio to rear line outputs. The tap is off the analogue signal path.S10 USB-C INTERFACE — optional record and playback tap, design targetCH1 tapBufferunity, 47ΩCH2 tapBufferunity, 47ΩCH3 tapBufferunity, 47ΩCH4 tapBufferunity, 47ΩMASTER L tapBufferunity, 47ΩMASTER R tapBufferunity, 47ΩADC AES9842PRO, CH1–4ADC BES9842PROmaster L / R + 2 spareTDMXU316USB Audio Class 2.0, asyncIsolatordigital, design targetUSB-Cto computerDAC sethost playbackRear line outsplayback onlyWhat this is, and is notThe analogue strips, isolators, filters and master run as in S1–S9 with the board removed or switched off: the interface only listens.ADC: 4-channel PCM, dynamic range +122 dB in 4-channel mode (+128 dB mono), THD+N -116 dB (datasheet figures, not measured here).122 dB ≈ 20.3 effective bits. 32-bit float is a file and transport format: its 24-bit significand covers that range without rounding.The converters deliver integer words; the host converts them to 32-bit float when it writes the file.Raw stream at 96 kHz, 8 channels, 32-bit words: 24.6 Mbit/s (49.2 at 192 kHz); USB 2.0 high speed carries 480 Mbit/s.Tap point per channel: before the fader (default) or after it, by a jumper. Own audio clock; USB is asynchronous.The real range is set by the analogue noise floor and the ADC, not by the float format.Design target. Parts named as reference choices from their datasheets; nothing here has been built or measured.
S10 USB-C interface (optional tap) (schematic) Swipe sideways to pan on a phone.
ItemValue / formula
PurposeRecord the four channels and the master over one USB-C cable, and play host audio back to rear line outputs. A tap: it listens to the analogue path and is not part of it. The mixer works with the board removed or switched off
ConvertersTwo ES9842PRO 4-channel ADCsR14: eight record channels (CH1–4, master L and R, two spare). Datasheet figures: dynamic range +122 dB in 4-channel mode (+128 dB mono), THD+N -116 dB, PCM / TDM words up to 32 bit. The ES9843PRO is an alternativeR15
USB deviceXMOS XU316 running USB Audio Class 2.0, asynchronous, as in the XK-AUDIO-316-MC reference (8 in / 8 out, up to 384 kHz, 32-bit)R16. The playback DAC part is not chosen in this draft
32-bit floatA file and transport format. The converters output integer words; the host converts to 32-bit float when it writes the file. Float has a 24-bit significand (about 144 dB), which holds the 122 dB converter range (about 20.3 effective bits) without rounding. The real dynamic range is whatever the datasheet and the analogue noise floor give; float does not add range to the analogue path
Data rateEight channels of 32-bit words: 24.6 Mbit/s at 96 kHz, 49.2 Mbit/s at 192 kHz (calculated); USB 2.0 high speed carries 480 Mbit/s
GroundingA digital isolator between the USB side and the audio ground (design target). Converters run from the board’s own audio clock
Not claimedNo measured figure for the assembled interface; the datasheet figures are the converter alone

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