# USB Measurement Audio Interface ## Description High-end 2-channel USB Audio Class 2.0 measurement interface for Smaart/REW use, with XMOS digital audio, isolated converter domain, smart encoder/LED UI, precision mic input, DAC line output, loopback ADC, phantom power, and protected USB-C power input. ## Project Details - **Owner:** feritja2 - **Created:** 7/21/2026 - **Last Updated:** 7/21/2026 - **Visibility:** Public - **Implementation Details:** XMOS UAC2, isolated I2S/I2C, precision ADC/DAC, phantom power - **Power Requirements:** USB - **Human Interface:** Rotary encoder - **Domain:** Scientific - **Connectivity:** USB ## Key Components ### D1 — [TPD2E2U06DCKR](https://www.flux.ai/lcsc/tpd2e2u06dckr~6ori.md) - Role: Protection - License: https://creativecommons.org/licenses/by/4.0/ - JLCPCB Part Class: Extended Part - Manufacturer Name: TI(德州仪器) - Datasheet URL: https://www.ti.com/lit/ds/symlink/tpd2e2u06.pdf?HQS=dis-dk-null-digikeymode-dsf-pf-null-wwe&ts=1779250564192&ref_url=https%253A%252F%252Fwww.ti.com%252Fgeneral%252Fdocs%252Fsuppproductinfo.tsp%253FdistId%253D10%2526gotoUrl%253Dhttps%253A%252F%252Fwww.ti.com%252Flit%252Fgpn%252Ftpd2e2u06 - Manufacturer Part Number: TPD2E2U06DCKR - Role Details: USB 2.0 D+/D- low-capacitance ground-referenced TVS; avoids connecting USBLC6 VBUS reference pin to 15V PD VBUS - Package or Case Code: SC-70-3_L2.0-W1.3-P0.65-LS2.1-BL - Functional Group: USB-C PD Front-End - Part Type: TVS - LCSC Part Number: C1855726 **Pins:** - GND [pin 3] - IO1 [pin 1] - IO2 [pin 2] ### D10 — [1N4148W-13-F](https://www.flux.ai/lcsc/1n4148w-13-f~5cuh.md) - Product Info Url: https://lcsc.com/product-detail/Switching-Diode_DIODES_1N4148W-13-F_1N4148W-13-F_C112342.html - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Diodes-Incorporated-1N4148W-13-F_C112342.pdf - Role Details: 1N4148 input steering diode per THAT1580 phantom application guidance - LCSC Part Number: C112342 - Functional Group: Mic Input + Phantom Injection - Package or Case Code: SOD-123_L2.7-W1.6-LS3.7-RD - Role: Protection - JLCPCB Part Class: Extended Part - Manufacturer Name: DIODES(美台) - Part Type: Switching Diode - Manufacturer Part Number: 1N4148W-13-F **Pins:** - 1 [pin 1] - 2 [pin 2] ### D11 — [BZT52C12-7-F](https://www.flux.ai/lcsc/bzt52c12-7-f~p7ye.md) - Role Details: 12 V zener clamps Q1 VGS; cathode to +48 V source, anode to Q1 gate - Product Info Url: https://lcsc.com/product-detail/Zener-Diodes_DIODES_BZT52C12-7-F_BZT52C12-7-F_C124196.html - Part Type: Zener Diodes - JLCPCB Part Class: Extended Part - LCSC Part Number: C124196 - Package or Case Code: SOD-123_L2.7-W1.6-LS3.7-RD - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/user-uploaded/e61ab987678771beec3696d1c7c275077dbd85f43b0d1d018c1cb2a70c76f48f.pdf - Manufacturer Name: DIODES(美台) - Manufacturer Part Number: BZT52C12-7-F - Functional Group: Mic Input + Phantom Injection - Role: Protection **Pins:** - A [pin 2] - C [pin 1] ### D12 — [BAS70L,315](https://www.flux.ai/lcsc/bas70lc315~ioyb.md) - JLCPCB Part Class: Extended Part - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Nexperia-BAS70L-315_C456141.pdf - Role: Logic-level Shifting - Manufacturer Name: Nexperia(安世) - Role Details: Diode-AND reset clamp: anode to XMOS_RST_N, cathode to PGOOD_XMOS_1V0 - Part Type: Schottky Barrier Diodes (SBD) - Product Info Url: https://lcsc.com/product-detail/Schottky-Barrier-Diodes-SBD_Nexperia-BAS70L-315_C456141.html - Manufacturer Part Number: BAS70L,315 - Package or Case Code: SOD-882_L1.0-W0.6-RD - LCSC Part Number: C456141 **Pins:** - 1 [pin 1] - 2 [pin 2] ### D13 — [BAS70L,315](https://www.flux.ai/lcsc/bas70lc315~ioyb.md) - LCSC Part Number: C456141 - Role Details: Diode-AND reset clamp: anode to XMOS_RST_N, cathode to PGOOD_3V3_DIG - Manufacturer Part Number: BAS70L,315 - Package or Case Code: SOD-882_L1.0-W0.6-RD - Role: Logic-level Shifting - Product Info Url: https://lcsc.com/product-detail/Schottky-Barrier-Diodes-SBD_Nexperia-BAS70L-315_C456141.html - Part Type: Schottky Barrier Diodes (SBD) - Manufacturer Name: Nexperia(安世) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Nexperia-BAS70L-315_C456141.pdf - JLCPCB Part Class: Extended Part **Pins:** - 1 [pin 1] - 2 [pin 2] ### D2 — [SMBJ24A-TR](https://www.flux.ai/lcsc/smbj24a-tr~hqz2.md) - LCSC Part Number: C133668 - JLCPCB Part Class: Extended Part - Product Info Url: https://lcsc.com/product-detail/TVS_STMicroelectronics_SMBJ24A-TR_SMBJ24A-TR_C133668.html - Manufacturer Name: ST(意法半导体) - Role Details: 24V standoff-class TVS on raw USB-C VBUS for 20V-capable PD protection margin - Functional Group: USB-C PD Front-End - Role: TVS Protection - Part Type: TVS - Manufacturer Part Number: SMBJ24A-TR - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_STMicroelectronics-SMBJ24A-TR_C133668.pdf - Package or Case Code: SMB_L4.6-W3.6-LS5.3-RD **Pins:** - A [pin 2] - K [pin 1] ### D3 — [MBR2H100SFT3G](https://www.flux.ai/rohit297/mbr2h100sft3g~th.md) - Manufacturer Name: onsemi(安森美) - Package or Case Code: SOD-123F_L2.8-W1.8-LS3.7-RD - Role Details: LT8330 boost rectifier diode; 100V rating for ~51V phantom preregulator output - Datasheet URL: https://www.lcsc.com/datasheet/lcsc_datasheet_1811131655_onsemi-MBR2H100SFT3G_C96515.pdf - Role: Rectification - Manufacturer Part Number: MBR2H100SFT3G - LCSC Part Number: C96515 - Part Type: Schottky Barrier Diodes (SBD) - Product Info Url: https://lcsc.com/product-detail/Others_ON-Semicon_MBR1H100SFT3G_ON-Semicon-ON-MBR1H100SFT3G_C235757.html - Functional Group: +48V Phantom Rail - JLCPCB Part Class: Extended Part **Pins:** - A [pin 2] - C [pin 1] ### D4 — [SMAJ58A-TR](https://www.flux.ai/lcsc/smaj58a-tr~x4k8.md) - Role: Protection - Part Type: TVS - Functional Group: +48V Phantom Rail - Product Info Url: https://lcsc.com/product-detail/TVS_STMicroelectronics_SMAJ58A-TR_SMAJ58A-TR_C132936.html - Manufacturer Name: ST(意法半导体) - Package or Case Code: SMA_L4.4-W2.8-LS5.4-RD - JLCPCB Part Class: Extended Part - Role Details: 58V standoff TVS on +48V phantom rail; stays off during normal P48 operation and clamps transients - Manufacturer Part Number: SMAJ58A-TR - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_STMicroelectronics-SMAJ58A-TR_C132936.pdf - LCSC Part Number: C132936 **Pins:** - A [pin 2] - K [pin 1] ### D5 — [S1DB-13-F](https://www.flux.ai/lcsc/s1db-13-f~fi6l.md) - Functional Group: Mic Input + Phantom Injection - Package or Case Code: SMB_L4.6-W3.6-LS5.3-RD - Product Info Url: https://lcsc.com/product-detail/Diodes-General-Purpose_DIODES_S1DB-13-F_S1DB-13-F_C151585.html - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Diodes-Incorporated-S1DB-13-F_C151585.pdf - Part Type: Diodes - General Purpose - Manufacturer Name: DIODES(美台) - Manufacturer Part Number: S1DB-13-F - JLCPCB Part Class: Extended Part - Role: Protection - Role Details: THAT1580 input fault clamp diode per THAT phantom application guidance - LCSC Part Number: C151585 **Pins:** - A [pin 2] - K [pin 1] ### D6 — [S1DB-13-F](https://www.flux.ai/lcsc/s1db-13-f~fi6l.md) - Manufacturer Part Number: S1DB-13-F - JLCPCB Part Class: Extended Part - Role Details: THAT1580 input fault clamp diode per THAT phantom application guidance - Manufacturer Name: DIODES(美台) - LCSC Part Number: C151585 - Role: Protection - Functional Group: Mic Input + Phantom Injection - Part Type: Diodes - General Purpose - Package or Case Code: SMB_L4.6-W3.6-LS5.3-RD - Product Info Url: https://lcsc.com/product-detail/Diodes-General-Purpose_DIODES_S1DB-13-F_S1DB-13-F_C151585.html - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Diodes-Incorporated-S1DB-13-F_C151585.pdf **Pins:** - A [pin 2] - K [pin 1] ### D7 — [S1DB-13-F](https://www.flux.ai/lcsc/s1db-13-f~fi6l.md) - Role: Protection - Part Type: Diodes - General Purpose - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Diodes-Incorporated-S1DB-13-F_C151585.pdf - Functional Group: Mic Input + Phantom Injection - Product Info Url: https://lcsc.com/product-detail/Diodes-General-Purpose_DIODES_S1DB-13-F_S1DB-13-F_C151585.html - Package or Case Code: SMB_L4.6-W3.6-LS5.3-RD - JLCPCB Part Class: Extended Part - Manufacturer Part Number: S1DB-13-F - Manufacturer Name: DIODES(美台) - Role Details: THAT1580 input fault clamp diode per THAT phantom application guidance - LCSC Part Number: C151585 **Pins:** - A [pin 2] - K [pin 1] ### D8 — [S1DB-13-F](https://www.flux.ai/lcsc/s1db-13-f~fi6l.md) - Part Type: Diodes - General Purpose - Role Details: THAT1580 input fault clamp diode per THAT phantom application guidance - Package or Case Code: SMB_L4.6-W3.6-LS5.3-RD - Product Info Url: https://lcsc.com/product-detail/Diodes-General-Purpose_DIODES_S1DB-13-F_S1DB-13-F_C151585.html - Functional Group: Mic Input + Phantom Injection - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Diodes-Incorporated-S1DB-13-F_C151585.pdf - Manufacturer Part Number: S1DB-13-F - JLCPCB Part Class: Extended Part - Role: Protection - Manufacturer Name: DIODES(美台) - LCSC Part Number: C151585 **Pins:** - A [pin 2] - K [pin 1] ### D9 — [1N4148W-13-F](https://www.flux.ai/lcsc/1n4148w-13-f~5cuh.md) - Manufacturer Part Number: 1N4148W-13-F - Role: Protection - Part Type: Switching Diode - JLCPCB Part Class: Extended Part - Manufacturer Name: DIODES(美台) - Role Details: 1N4148 input steering diode per THAT1580 phantom application guidance - Package or Case Code: SOD-123_L2.7-W1.6-LS3.7-RD - Functional Group: Mic Input + Phantom Injection - LCSC Part Number: C112342 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Diodes-Incorporated-1N4148W-13-F_C112342.pdf - Product Info Url: https://lcsc.com/product-detail/Switching-Diode_DIODES_1N4148W-13-F_1N4148W-13-F_C112342.html **Pins:** - 1 [pin 1] - 2 [pin 2] ### J1 — [USB4105-GF-A](https://www.flux.ai/adrian95/usb4105-gf-a~im9.md) - Manufacturer Name: GCT - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: USB C - Functional Group: USB-C PD Front-End - Role Details: USB-C receptacle; VBUS/CC/D+/D-/shield entry point - Manufacturer Part Number: USB4105-GF-A - Datasheet URL: https://gct.co/files/specs/usb4105-spec.pdf - Symbol Style: parametric-v1 - Role: Connector - Manufacturer Name: GCT **Pins:** - CC1 [pin A5] - CC2 [pin B5] - DN1 [pin A7] - DN2 [pin B7] - DP1 [pin A6] - DP2 [pin B6] - GND [pin A1_B12] - GND__1 [pin B1_A12] - SBU1 [pin A8] - SBU2 [pin B8] - SHELL_GND [pin SH1] - SHELL_GND__1 [pin SH2] - SHELL_GND__2 [pin SH3] - SHELL_GND__3 [pin SH4] - VBUS [pin A4_B9] - VBUS__1 [pin B4_A9] ### J2 — [NC3FAH2](https://www.flux.ai/adrian95/nc3fah2~apk.md) - Role Details: Female 3-pin XLR mic input; pin 1 shield/chassis, pins 2/3 balanced audio with phantom injection - Manufacturer Name: Neutrik - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.neutrik.com/en/product/NC3FAH2.pdf - Functional Group: Mic Input + Phantom Injection - Part Type: Connector - Connector Gender: Female - Manufacturer Part Number: NC3FAH2 - Connector Type: XLR Connector - Role: Connector **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - G [pin G] ### J3 — [ARM JTAG SWD 10Pin 0.1" Connector](https://www.flux.ai/vasy_skral/arm-jtag-swd-10pin-01-connector~wke.md) - Functional Group: XMOS / Debug - Part Type: Connector - Role: Debug Connector - Role Details: JTAG-only debug/programming access for XU208; compact substitute for unavailable 20-pin xSYS header **Pins:** - ~RESET~ [pin 10] - GND [pin 5] - GND [pin 3] - GNDDetect [pin 9] - NC [pin 7] - NC/TDI [pin 8] - SWDCLK/TCK [pin 4] - SWDIO/TMS [pin 2] - SWO/TDO [pin 6] - VTref [pin 1] ### J4 — [NC3MAH](https://www.flux.ai/adrian95/nc3mah~osp.md) - Connector Gender: Male Receptacle - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.neutrik.com/en/product/nc3mah - Functional Group: DAC / Line Output - Part Type: Connector - Role: Connector - Connector Type: XLR Connector - Manufacturer Part Number: NC3MAH - Manufacturer Name: Neutrik - Role Details: Balanced line output XLR; pin 2 hot, pin 3 cold, pin 1 shield/chassis **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - G1 [pin G1] ### J5 — [NC3MAH](https://www.flux.ai/adrian95/nc3mah~osp.md) - Part Type: Connector - Role Details: Balanced line output XLR; pin 2 hot, pin 3 cold, pin 1 shield/chassis - Datasheet URL: https://www.neutrik.com/en/product/nc3mah - Connector Gender: Male Receptacle - License: https://creativecommons.org/licenses/by/4.0/ - Role: Connector - Manufacturer Name: Neutrik - Manufacturer Part Number: NC3MAH - Functional Group: DAC / Line Output - Connector Type: XLR Connector **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - G1 [pin G1] ### Q1 — [ZVP3310FTA](https://www.flux.ai/adrian95/zvp3310fta~3y1.md) - Manufacturer Part Number: ZVP3310FTA - Datasheet URL: https://www.diodes.com/assets/Datasheets/ZVP3310F.pdf - Role: Switching - Role Details: High-side 100 V P-MOSFET switches +48 V phantom to matched 6.81 kΩ feed resistors; source to raw +48 V, drain to switched phantom rail - Part Type: Transistor - License: https://creativecommons.org/licenses/by/4.0/ - Functional Group: Mic Input + Phantom Injection - Manufacturer Name: Diodes Incorporated **Pins:** - D [pin 3] - G [pin 2] - S [pin 1] ### Q2 — [MMBT5551LT3G](https://www.flux.ai/lcsc/mmbt5551lt3g~mh.md) - Part Type: Bipolar Transistors - BJT - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2410010304_onsemi-MMBT5551LT3G_C152516.pdf - Product Info Url: https://lcsc.com/product-detail/Transistors-NPN-PNP_ON_MMBT5551LT3G_MMBT5551LT3G_C152516.html - JLCPCB Part Class: Extended Part - LCSC Part Number: C152516 - Role Details: 160 V NPN pulls P-MOS gate down from MCU enable through current-limited path; emitter to GND, collector to gate-drive node - Package or Case Code: SOT-23-3_L2.9-W1.6-P1.90-LS2.8-BR - Manufacturer Name: onsemi(安森美) - Functional Group: Mic Input + Phantom Injection - Role: Switching - Manufacturer Part Number: MMBT5551LT3G **Pins:** - B [pin 1] - C [pin 3] - E [pin 2] ### U1 — [STUSB4500QTR](https://www.flux.ai/kicad-part-library/stusb4500qtr~tgl.md) - Datasheet URL: https://www.st.com/resource/en/datasheet/stusb4500.pdf - Manufacturer Part Number: STUSB4500QTR - Role Details: Autonomous PD sink controller; NVM PDOs 15V preferred / 9V fallback / 5V limited; I2C status to MCU - Functional Group: USB-C PD Front-End - Package or Case Code: QFN-24-1EP_4x4mm_P0.5mm_EP2.7x2.7mm - Role: USB-C PD Controller **Pins:** - A_B_SIDE [pin 17] - ADDR0 [pin 12] - ADDR1 [pin 13] - ALERT [pin 19] - ATTACH [pin 11] - CC1 [pin 2] - CC1DB [pin 1] - CC2 [pin 4] - CC2DB [pin 5] - DISCH [pin 9] - GND [pin 25] - GND [pin 10] - GPIO [pin 15] - NC [pin 3] - POWER_OK2 [pin 20] - POWER_OK3 [pin 14] - RESET [pin 6] - SCL [pin 7] - SDA [pin 8] - VBUS_EN_SNK [pin 16] - VBUS_VS_DISCH [pin 18] - VDD [pin 24] - VREG_1V2 [pin 21] - VREG_2V7 [pin 23] - VSYS [pin 22] ### U10 — [W25Q32JVZP](https://www.flux.ai/kicad-part-library/w25q32jvzp~v2.md) - Functional Group: XMOS / Boot - Datasheet URL: http://www.winbond.com/resource-files/w25q32jv%20revg%2003272018%20plus.pdf - Role Details: QSPI flash for XU208 xflash boot; boot-strap-aware wiring required - Package or Case Code: WSON-8-1EP_6x5mm_P1.27mm_EP3.4x4.3mm - Manufacturer Part Number: W25Q32JVZP - Role: Boot Flash **Pins:** - ~{CS} [pin 1] - CLK [pin 6] - DI(IO0) [pin 5] - DO(IO1) [pin 2] - EP [pin 9] - GND [pin 4] - IO2 [pin 3] - IO3 [pin 7] - VCC [pin 8] ### U11 — [LMR33630ADDA](https://www.flux.ai/lcsc/lmr33630adda~mf4w.md) - Datasheet URL: https://www.ti.com/lit/ds/symlink/lmr33630.pdf?HQS=dis-dk-null-digikeymode-dsf-pf-null-wwe&ts=1780495101449&ref_url=https%253A%252F%252Fwww.ti.com%252Fgeneral%252Fdocs%252Fsuppproductinfo.tsp%253FdistId%253D10%2526gotoUrl%253Dhttps%253A%252F%252Fwww.ti.com%252Flit%252Fgpn%252Flmr33630 - Symbol Style: parametric-v1 - JLCPCB Part Class: Extended Part - LCSC Part Number: C2866787 - Part Type: DC-DC Converters - Role: Power Conversion - Manufacturer Name: TI(德州仪器) - Role Details: 15V/9V protected PD input to XMOS_1V0_CORE, target >=0.5A, 400kHz variant chosen for 15V-to-1V min-on-time margin - Functional Group: Low Voltage Power - Package or Case Code: ESOP-8_L4.9-W3.9-P1.27-LS6.0-BL-EP-1 - Manufacturer Part Number: LMR33630ADDA **Pins:** - BOOT [pin 7] - EN [pin 3] - EP [pin 9] - FB [pin 5] - PG [pin 4] - PGND [pin 1] - SW [pin 8] - VCC [pin 6] - VIN [pin 2] ### U12 — [LMR33630BDDAR](https://www.flux.ai/lcsc/lmr33630bddar~o51d.md) - Manufacturer Name: TI(德州仪器) - Role Details: 15V/9V protected PD input to 3V3_DIG, target >=1A design margin - Functional Group: Low Voltage Power - Role: Power Conversion - LCSC Part Number: C544370 - Datasheet URL: https://www.ti.com/lit/ds/symlink/lmr33630.pdf - Package or Case Code: SOIC-8_L4.9-W3.9-P1.27-LS6.0-BL-EP2.8-1 - Part Type: DC-DC Converters - JLCPCB Part Class: Extended Part - Manufacturer Part Number: LMR33630BDDAR **Pins:** - BOOT [pin 7] - EN [pin 3] - EP [pin 9] - FB [pin 5] - PG [pin 4] - PGND [pin 1] - SW [pin 8] - VCC [pin 6] - VIN [pin 2] ### U13 — [PCM5242RHBR](https://www.flux.ai/lcsc/pcm5242rhbr~j0wb.md) - Role Details: Stereo DAC, hardware I2S slave mode from XMOS, single-ended outputs feed balanced line drivers - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/1912251810_Texas-Instruments-PCM5242RHBR_C471871.pdf - Functional Group: DAC / Line Output - Package or Case Code: VQFN-32_L5.0-W5.0-P0.50-BL-EP - Manufacturer Name: TI(德州仪器) - Part Type: Digital To Analog Converters (DACs) - JLCPCB Part Class: Extended Part - Role: Signal Conversion - Manufacturer Part Number: PCM5242RHBR - Product Info Url: https://lcsc.com/product-detail/Digital-To-Analog-Converters-DACs_Texas-Instruments-Texas-Instruments-PCM5242RHBR_C471871.html - LCSC Part Number: C471871 **Pins:** - ADR1/MISO/FMT [pin 32] - ADR2/GPIO2/GPO [pin 22] - AGND [pin 15] - AVDD [pin 14] - BCK [pin 27] - CAPM [pin 8] - CAPP [pin 6] - CPGND [pin 7] - CPVDD [pin 5] - DGND [pin 3] - DIN [pin 28] - DVDD [pin 4] - GPIO3/AGNS [pin 21] - GPIO4/MAST [pin 20] - GPIO5/ATT0 [pin 19] - GPIO6/FLT [pin 25] - LDOO [pin 2] - LRCK [pin 31] - MODE1 [pin 23] - MODE2/MS [pin 24] - NC [pin 30] - NC [pin 29] - OUTLN [pin 11] - OUTLP [pin 10] - OUTRN [pin 12] - OUTRP [pin 13] - PAD [pin 33] - SCK [pin 26] - SCL/MC/ATT1 [pin 18] - SDA/MOSI/ATT2 [pin 17] - VCOM [pin 16] - VNEG [pin 9] - XSMT [pin 1] ### U14 — [DRV134UA/1K](https://www.flux.ai/jecstronic/drv134ua1k~9dk.md) - Datasheet URL: https://www.ti.com/lit/ds/symlink/drv134.pdf - Role Details: Mono balanced line driver on ±15VA rails; one per DAC output channel - Manufacturer Name: Texas Instruments - Manufacturer Part Number: DRV134UA/1K - License: https://creativecommons.org/licenses/by/4.0/ - Role: Amplification - Part Type: Integrated Circuit - Functional Group: DAC / Line Output **Pins:** - -SENSE [pin 4] - -VO [pin 3] - +SENSE [pin 13] - +VO [pin 14] - GND [pin 5] - V- [pin 11] - V+ [pin 12] - VIN [pin 6] ### U15 — [DRV134UA/1K](https://www.flux.ai/jecstronic/drv134ua1k~9dk.md) - Manufacturer Name: Texas Instruments - Functional Group: DAC / Line Output - Datasheet URL: https://www.ti.com/lit/ds/symlink/drv134.pdf - Role Details: Mono balanced line driver on ±15VA rails; one per DAC output channel - Role: Amplification - Part Type: Integrated Circuit - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: DRV134UA/1K **Pins:** - -SENSE [pin 4] - -VO [pin 3] - +SENSE [pin 13] - +VO [pin 14] - GND [pin 5] - V- [pin 11] - V+ [pin 12] - VIN [pin 6] ### U16 — [CCG15-24-15D](https://www.flux.ai/adrian95/ccg15-24-15d~8xp.md) - Part Type: Power Source - Role: Power Conversion - Package or Case Code: CCG152403S - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: TDK-Lambda CCG15-24-15D isolated DC/DC, 9–36 V input, ±15 V outputs at 0.5 A/rail; RC left open for standard positive-logic ON state - Manufacturer Name: TDK Lambda - Manufacturer Part Number: CCG15-24-15D - Datasheet URL: https://product.tdk.com/system/files/dam/doc/product/power/switching-power/dc-dc-converter/catalog/ccg_e.pdf **Pins:** - -VIN [pin 2] - -VOUT [pin 6] - +VIN [pin 1] - +VOUT [pin 4] - COM [pin 5] - RC [pin 3] ### U2 — [TPS25940LRVCR](https://www.flux.ai/adrian95/tps25940lrvcr~ojd.md) - Role Details: 15V PD eFuse/load switch; target input path 15V/1.5A with 15W+ margin, OVP/UVLO/inrush/current limit to be set by support passives - Functional Group: USB-C PD Front-End - Role: Power Path Protection - Manufacturer Part Number: TPS25940LRVCR - Datasheet URL: https://www.ti.com/lit/ds/symlink/tps25940.pdf - Part Type: Integrated Circuit - License: https://creativecommons.org/licenses/by/4.0/ - Symbol Style: parametric-v1 - Manufacturer Name: Texas Instruments **Pins:** - ~FLT [pin 20] - DEVSLP [pin 1] - DVDT [pin 18] - EN [pin 14] - EP [pin 21] - GND [pin 16] - ILIM [pin 17] - IMON [pin 19] - IN_1 [pin 9] - IN_2 [pin 10] - IN_3 [pin 11] - IN_4 [pin 12] - IN_5 [pin 13] - OUT_1 [pin 4] - OUT_2 [pin 5] - OUT_3 [pin 6] - OUT_4 [pin 7] - OUT_5 [pin 8] - OVP [pin 15] - PGOOD [pin 2] - PGTH [pin 3] ### U3 — [LT8330IS6#TRMPBF](https://www.flux.ai/lcsc/lt8330is6trmpbf~co6t.md) - Manufacturer Part Number: LT8330IS6#TRMPBF - LCSC Part Number: C580286 - Role Details: LT8330 boost preregulator; 15V input to ~51V at 10-15mA phantom budget, kept below 60V switch limit - Manufacturer Name: ADI(亚德诺) - Package or Case Code: TSOT-23-6_L2.9-W1.6-P0.95-LS2.8-BR - Role: Power Conversion - Functional Group: +48V Phantom Rail **Pins:** - EN/UVLO [pin 4] - FBX [pin 3] - GND [pin 2] - INTVCC [pin 5] - SW [pin 1] - VIN [pin 6] ### U4 — [TPS7A4001DGNT](https://www.flux.ai/lcsc/tps7a4001dgnt~xnhs.md) - JLCPCB Part Class: Extended Part - Product Info Url: https://lcsc.com/product-detail/Linear-Voltage-Regulators_Texas-Instruments-Texas-Instruments-TPS7A4001DGNT_C469888.html - Datasheet URL: https://assets.lcsc.com/datasheet/szlcsc/Download-ISO9001-Certification.pdf - Manufacturer Name: TI(德州仪器) - Functional Group: +48V Phantom Rail - Role Details: TPS7A4001 100V/50mA LDO set to +48V; ~51V input, 10-15mA phantom budget, low dissipation - Manufacturer Part Number: TPS7A4001DGNT - Package or Case Code: SOP-8_L3.0-W3.0-P0.65-LS4.9-BL-EP - Role: Power Filtering - Part Type: Linear Voltage Regulators (LDO) - LCSC Part Number: C469888 **Pins:** - EN [pin 5] - EP [pin 9] - FB [pin 2] - GND [pin 4] - IN [pin 8] - NC [pin 7] - NC [pin 3] - NC [pin 6] - OUT [pin 1] ### U5 — [THAT1580](https://www.flux.ai/vasyl/that1580~y4p.md) - Role Details: THAT1580 low-noise differential mic preamp; ±15V analog supplies, inputs protected for phantom faults - Datasheet URL: http://www.thatcorp.com/datashts/THAT_1580_Datasheet.pdf - Part Type: Integrated Circuit - Role: Amplification - Manufacturer Part Number: THAT1580 - Manufacturer Name: THAT Corporation - Functional Group: Mic Input + Phantom Injection **Pins:** - 1 [pin 3] - 2 [pin 2] - IN1 [pin 7] - IN2 [pin 10] - Rg1 [pin 6] - Rg2 [pin 15] - V- [pin 17] - V- [pin 12] - V+ [pin 13] ### U6 — [THAT5171](https://www.flux.ai/vasyl/that5171~8pw.md) - Manufacturer Name: THAT Corporation - Manufacturer Part Number: THAT5171 - Functional Group: Mic Input + Phantom Injection - Datasheet URL: http://www.thatcorp.com/datashts/THAT_5171_Datasheet.pdf - Role: Amplification - Part Type: Integrated Circuit - Role Details: THAT5171 digital preamp controller; SPI-controlled gain network and servo for THAT1580 **Pins:** - ~CS [pin 16] - ~RST [pin 15] - AGND [pin 10] - AGND [pin 28] - BSY [pin 22] - DGND [pin 12] - DGND [pin 20] - DIN [pin 18] - DOUT [pin 19] - GPO0 [pin 23] - GPO1 [pin 24] - GPO2 [pin 25] - GPO3 [pin 26] - IN1 [pin 4] - IN2 [pin 5] - NC [pin 1] - NC [pin 2] - NC [pin 7] - NC [pin 8] - NC [pin 27] - PAD [pin 33] - Rg1 [pin 3] - Rg2 [pin 6] - SCAP1 [pin 29] - SCAP2 [pin 30] - SCLK [pin 17] - SOUT1 [pin 31] - SOUT2 [pin 32] - TRC [pin 14] - VCC [pin 9] - VDD [pin 21] - VDD [pin 13] - VEE [pin 11] ### U7 — [AK5574EN](https://www.flux.ai/lcsc/ak5574en~f9xd.md) - Datasheet URL: https://www.akm-semi.com/pdf-66/ak5574en.pdf - JLCPCB Part Class: Extended Part - Manufacturer Part Number: AK5574EN - Package or Case Code: QFN-48_L7.0-W7.0-P0.50-BL-EP5.1 - Part Type: Integrated Circuit - Functional Group: ADC Front End - Role: Signal Conversion - LCSC Part Number: C2651665 - Role Details: AKM premium 4-channel differential audio ADC; CH1 driven from OPA1632 mic preamp driver, CH2 reserved for loopback/reference path - Manufacturer Name: AKM **Pins:** - AIN1N [pin 48] - AIN1P [pin 47] - AIN2N [pin 4] - AIN2P [pin 5] - AIN3N [pin 9] - AIN3P [pin 8] - AIN4N [pin 13] - AIN4P [pin 14] - AVDD [pin 6] - AVSS [pin 7] - BICK/DCLK [pin 25] - CKS0/SDA/CDTI [pin 31] - CKS1/CAD0_I2C/CSN [pin 32] - CKS2/SCL/CCLK [pin 33] - CKS3/CAD1 [pin 34] - DIF0/DSDSEL0 [pin 37] - DIF1/DSDSEL1 [pin 38] - DP [pin 43] - DVSS [pin 18] - EP [pin 49] - HPFE/DCKS [pin 44] - I2C [pin 42] - LDOE [pin 45] - LRCK/DSDOL1 [pin 26] - MCLK [pin 16] - MSN [pin 24] - NC [pin 1] - NC [pin 12] - ODP [pin 46] - OVF [pin 30] - PDN [pin 20] - PSN/CAD0_SPI [pin 41] - PW0 [pin 21] - PW1 [pin 22] - PW2 [pin 23] - SD/PMOD [pin 36] - SDTO1/DSDOL2 [pin 28] - SDTO2/DSDOR2 [pin 29] - SLOW/DCKB [pin 35] - TDM0 [pin 39] - TDM1 [pin 40] - TDMIN/DSDOR1 [pin 27] - TEST [pin 15] - TVDD [pin 17] - VDD18 [pin 19] - VREFH1 [pin 3] - VREFH2 [pin 10] - VREFL1 [pin 2] - VREFL2 [pin 11] ### U8 — [OPA1632DR](https://www.flux.ai/vasy_skral/opa1632dr~yx9.md) - Manufacturer Name: Texas Instruments - Datasheet URL: https://www.ti.com/lit/ds/symlink/opa1632.pdf - Functional Group: ADC Front End - Role Details: OPA1632 fully differential audio ADC driver; attenuates/buffers THAT1580 outputs and biases output common-mode from AK5574 VCOM - Role: Amplification - Manufacturer Part Number: OPA1632DR - Part Type: Operational Amplifier (OP-AMP) **Pins:** - ENABLE [pin 7] - V- [pin 6] - V+ [pin 3] - VIN- [pin 1] - VIN+ [pin 8] - VOCM [pin 2] - VOUT- [pin 5] - VOUT+ [pin 4] ### U9 — [XU208-128-TQ64-C10](https://www.flux.ai/lcsc/xu208-128-tq64-c10~m4d9.md) - Datasheet URL: https://www.lcsc.com/datasheet/C2640133.pdf?spm=wm.sxq.inf.ggs&lcsc_vid=FgRaVVdXRFFZBFZfQlEIUFAAQVVXUAZeQAVWVAVTTlgxVlNRQ1laX1VVR1NbVjsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D - Role: USB Audio Processor - Manufacturer Part Number: XU208-128-TQ64-C10 - JLCPCB Part Class: Extended Part - Package or Case Code: TQFP-64_L10.0-W10.0-P0.50-LS12.0-BL-EP5.3 - LCSC Part Number: C2640133 - Manufacturer Name: XMOS - Part Type: Microcontroller - Functional Group: XMOS / Digital Audio - Role Details: XMOS XU208 core processor for UAC2, ADC/DAC serial audio, clocking and USB data - Symbol Style: parametric-v1 **Pins:** - CLK [pin 58] - EP [pin 65] - NC [pin 33] - OTP_VCC [pin 55] - PLL_AGND [pin 54] - PLL_AVDD [pin 53] - RST_N [pin 57] - TCK [pin 61] - TDI [pin 62] - TDO [pin 63] - TMS [pin 60] - USB_DM [pin 26] - USB_DP [pin 25] - USB_ID [pin 21] - USB_RTUNE [pin 24] - USB_VBUS [pin 23] - USB_VDD [pin 27] - USB_VDD33 [pin 22] - VDD [pin 40] - VDD [pin 20] - VDD [pin 31] - VDD [pin 59] - VDD [pin 9] - VDD [pin 52] - VDD [pin 41] - VDD [pin 10] - VDD [pin 39] - VDD [pin 56] - VDDIOL [pin 3] - VDDIOL [pin 13] - VDDIOR [pin 44] - VDDIOR [pin 34] - X0D00 [pin 14] - X0D01 [pin 11] - X0D04 [pin 15] - X0D05 [pin 17] - X0D06 [pin 18] - X0D07 [pin 19] - X0D10 [pin 12] - X0D11 [pin 16] - X0D14 [pin 28] - X0D15 [pin 29] - X0D16 [pin 35] - X0D17 [pin 36] - X0D18 [pin 37] - X0D19 [pin 38] - X0D20 [pin 30] - X0D21 [pin 32] - X0D27 [pin 45] - X0D28 [pin 47] - X0D29 [pin 49] - X0D30 [pin 50] - X0D31 [pin 51] - X0D32 [pin 46] - X0D33 [pin 48] - X0D35 [pin 42] - X0D36 [pin 1] - X0D36 [pin 43] - X0D37 [pin 64] - X0D38 [pin 2] - X0D39 [pin 4] - X0D40 [pin 5] - X0D41 [pin 6] - X0D42 [pin 7] - X0D43 [pin 8] ### Y1 — [ECS-3225Q-33-240-DP-TR](https://www.flux.ai/adrian95/ecs-3225q-33-240-dp-tr~x2o.md) - Datasheet URL: https://ecsxtal.com/store/pdf/ECS-3225Q.pdf - Role: Clock Source - License: https://creativecommons.org/licenses/by/4.0/ - Functional Group: XMOS / Clocking - Manufacturer Part Number: ECS-3225Q-33-240-DP-TR - Manufacturer Name: ECS Inc. - Part Type: Oscillator - Role Details: 24 MHz XU208 PLL/USB reference oscillator **Pins:** - GND [pin 2] - OUTPUT [pin 3] - TRI-STATE [pin 1] - VDD [pin 4] ### Y2 — [CCHD-957-25-24.576](https://www.flux.ai/adrian95/cchd-957-25-24p576~ol8.md) - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.digikey.ph/en/products/detail/crystek-corporation/CCHD-957-25-24-576/2742156?msockid=39f1ec84d77b6f4428b7f904d6676eed - Manufacturer Part Number: CCHD-957-25-24.576 - Role Details: 48 kHz-family low-jitter audio master clock source - Manufacturer Name: Crystek Corporation - Functional Group: XMOS / Clocking - Role: Clock Source - Mount: Surface Mount - Part Type: Oscillators **Pins:** - E/D [pin 1] - GND [pin 2] - OUT [pin 3] - VCC [pin 4] ### Y3 — [ASELJ-E-22.5792MHZ-L-R-T](https://www.flux.ai/adrian95/aselj-e-22p5792mhz-l-r-t~oqi.md) - Datasheet URL: https://abracon.com/datasheets/ASELJ.pdf - Part Type: Oscillator - Role: Clock Source - Package or Case Code: ASELJE225792MHzLRT - Functional Group: XMOS / Clocking - Manufacturer Name: Abracon LLC - Role Details: 44.1 kHz-family low-jitter audio master clock source - Manufacturer Part Number: ASELJ-E-22.5792MHZ-L-R-T - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - GND [pin 2] - OE [pin 1] - OUTPUT [pin 3] - VDD [pin 4] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/feritja2/usb-measurement-audio-interface~w2](https://www.flux.ai/feritja2/usb-measurement-audio-interface~w2).* --- *Generated from [https://www.flux.ai/feritja2/usb-measurement-audio-interface~w2](https://www.flux.ai/feritja2/usb-measurement-audio-interface~w2)*