# dsp ## Description Welcome to your new project. Imagine what you can build here. ## Project Details - **Owner:** ajey - **Created:** 3/16/2026 - **Last Updated:** 3/23/2026 - **Visibility:** Public - **Routing Discipline - DAC Diff Pairs:** AK4458 differential outputs must be routed as tightly coupled pairs with consistent spacing and equal length. Keep entirely inside analog region and away from digital signals. - **Design Intent:** 16-channel automotive audio DSP main board; strict analog/digital partitioning; low-noise clocking; modular balanced output connector - **Routing Discipline - Output Channel Mirroring:** Keep channel-to-channel topology consistent from DAC -> RC -> OPA1652 -> output protection -> connector. Mirror routing patterns when possible; keep lengths consistent; avoid sharp corners in analog paths. - **Decoupling Preparation:** Per IC power pin: local 0.1uF to GND placed at pin; per-rail local bulk near each IC cluster (e.g., 10uF) and additional bulk near regulator outputs. Clock XO and clock buffer on +3V3_CLK with local 0.1uF + 1uF. DSP/DACs require dedicated local decoupling on each supply pin plus nearby bulk. - **Net Naming Conventions:** Digital nets: MCLK, TDM_BCLK, TDM_LRCLK, TDM_DATA, I2S_BCLK, I2S_LRCLK, I2S_DATA, I2C_SCL, I2C_SDA. DAC differential outputs: DACx_CHy_P and DACx_CHy_N where x=1..2, y=1..8. - **System Architecture:** flowchart TD subgraph Power [Power Tree] VIN12["VIN_12V Automotive In"] --> TVS["TVS Clamp"] --> Buck5V["Buck +5V_MAIN"] Buck5V --> LDO33DSP["LDO +3V3_DSP_DIG"] Buck5V --> LDO33MCU["LDO +3V3_MCU"] Buck5V --> LDO33AUD["LDO +3V3_DIG_AUDIO"] Buck5V --> LDO12["LDO +1V2_DSP_CORE"] Buck5V --> LDO33CLK["LDO +3V3_CLK_LN"] Buck5V --> ANA5V["+5V_DAC_ANA_LN (TBD: low noise) "] Buck5V --> OPAMP12["+12V_OPAMP (pass-through from VIN or local) "] end subgraph Inputs [Digital Inputs] SPDIFCoax["Coax SPDIF In"] --> SPDIFRX["CS8416-CSZ TEMP"] SPDIFRX --> I2Sbus["I2S: BCLK LRCLK DATA"] end subgraph Clock [Quiet Clock Corridor] XO["24.576MHz XO NSA3579D TEMP"] --> Fanout["NB3L553 Fanout"] Fanout --> DSPMCLK["DSP MCLK"] Fanout --> DAC1MCLK["DAC1 MCLK"] Fanout --> DAC2MCLK["DAC2 MCLK"] end subgraph Core [DSP Core] SPDIFRX --> DSP["ADAU1467 DSP"] Flash["W25Q64 SPI Flash"] --> DSP DSP --> TDM["TDM8 Corridor: BCLK LRCLK DATA"] end subgraph DACs [DAC Conversion] TDM --> DAC1["AK4458 DAC CH1-8"] TDM --> DAC2["AK4458 DAC CH9-16"] DAC1 --> DacOut1["DAC Diff Out P/N"] DAC2 --> DacOut2["DAC Diff Out P/N"] end subgraph Analog [Analog Output Buffer] DacOut1 --> Buf["OPA1678IDR TEMP x8 dual"] DacOut2 --> Buf Buf --> OutConn["Output Connector J3"] end subgraph Control [MCU Control and Isolation] MCU["ESP32-WROOM-32E"] -->|"I2C SDA SCL"| DSP MCU --> UART["UART Debug Header"] MCU --> GPIO["Spare IO / Test"] end - **Placement Zones Intent:** Power corner; Digital Input edge; DSP+Flash center; Clock Island adjacent to DSP/DACs and isolated from MCU and switching; DAC section adjacent to DSP; Analog Output section near output connector edge; ESP32 control section far from analog and clock - **Routing Discipline - TDM8 Bus:** Route ADAU1467<->AK4458x2 TDM8 as a grouped bus in a single dedicated corridor. Keep all TDM lines similar length, avoid stubs, avoid unnecessary vias, prefer symmetric topology to both DACs. - **PCB Stackup:** 4-layer: L1 signals/components, L2 continuous GND, L3 power planes, L4 secondary signals - **Net Labeling Strategy:** Explicit labels: MCLK, TDM_BCLK, TDM_LRCLK, TDM_DATA (and optional TDM_DATA2 if needed), I2S_BCLK, I2S_LRCLK, I2S_DATA, I2C_SCL, I2C_SDA, SPI_SCK, SPI_MOSI, SPI_MISO, SPI_CS, UART_TX, UART_RX. DAC outputs named DACx_CHy_P and DACx_CHy_N. - **Routing Discipline - Clock Corridor:** Dedicated quiet clock corridor: Oscillator -> NB3L553 -> DSP + DAC1 + DAC2. Keep traces short/direct over continuous L2 GND, minimize vias, avoid proximity/parallelism to switching regulator nodes and other digital buses, keep away from ESP32 region. - **Routing Discipline - ESP32 Isolation:** ESP32/control region must be physically separated from analog output and clock island. Do not route MCU signals through analog region. Keep MCU signals away from the clock corridor/clock island. - **Stackup:** Standard 4 Layer (L2 continuous GND intent) - **Routing Constraints:** TDM8 corridor: route as grouped bus, length-similar, avoid stubs/vias, single corridor DSP->DACs, symmetric topology to both DACs. Clock corridor: Oscillator->NB3L553->DSP/DACs, short/direct over continuous GND, avoid buck/ESP32, avoid parallel to digital buses, minimize vias. DAC analog outputs: tightly coupled diff pairs, equal length, consistent spacing, stay in analog region. Analog shielding: no digital through analog, guard traces/via fence where possible, continuous GND reference. Connector consistency: mirror channel routing, consistent lengths, avoid sharp turns. ESP32 isolation: keep MCU and its signals away from clock island and analog output region. - **Routing Discipline:** TDM8 routed as grouped bus with length-similar lines, single corridor DSP->DAC1/DAC2, symmetric topology, minimize vias and stubs; clock corridor XO->NB3L553->DSP/DACs short/direct over continuous GND, avoid buck/ESP32 and avoid parallel to digital buses, minimize vias; DAC outputs tightly coupled differential pairs, equal length, consistent spacing, stay in analog region; no digital through analog region; guard traces/ground via shielding where possible; output channels mirrored/consistent topology; ESP32 isolated from analog and clock region - **Routing Discipline - Analog Shielding:** No digital signals in analog output region. Maintain continuous ground reference under analog routing (L2 unbroken). Use ground guard traces where possible and via fencing around sensitive analog traces. - **Board Outline:** 100mm x 100mm rectangle, 2mm corner radius - **Power Tree Rails:** VIN_12V (automotive), +12V_OPAMP, (optional -12V_OPAMP), +5V_MAIN (buck output), +5V_DAC_ANA_LN, +3V3_DSP_DIG, +3V3_MCU, +3V3_DIG_AUDIO, +3V3_CLK_LN, +1V2_DSP_CORE. Ferrite bead isolation between digital and analog/clock rails. - **Stackup Intent:** 4-layer: L1 components/high-speed, L2 continuous GND, L3 power planes, L4 secondary signals - **Board Size:** 100mm x 100mm ## Key Components ### D1 — [SMBJ16A](https://www.flux.ai/adrian95/smbj16a~yj0.md) - Manufacturer Name: Littelfuse Inc. - Role Details: VIN_12V transient clamp (automotive load dump/ESD) ahead of buck input - Datasheet URL: https://www.littelfuse.com/~/media/electronics/datasheets/tvs_diodes/littelfuse_tvs_diode_smbj_datasheet.pdf.pdf - Role: Protection - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Diode - Manufacturer Part Number: SMBJ16A - Package: DO-214AA (SMBJ) **Pins:** - A [pin 2] - K [pin 1] ### D2 — [SS14L](https://www.flux.ai/lcsc/ss14l~7qe0.md) - Package or Case Code: SOD-123F_L2.8-W1.8-LS3.7-RD - Package: SOD-123F - Role: Protection - JLCPCB Part Class: Extended Part - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2204281430_Guangdong-Hottech-SS14L_C190475.pdf - Manufacturer Name: Hottech(合科泰) - LCSC Part Number: C190475 - Role Details: Schottky diode placeholder for protection/ORing as required - Product Info Url: https://lcsc.com/product-detail/Others_SS14L_C190475.html - Part Type: Schottky Barrier Diodes (SBD) - Manufacturer Part Number: SS14L **Pins:** - A [pin 2] - K [pin 1] ### FB1 — [2508056017Y2](https://www.flux.ai/adrian95/2508056017y2~n1q.md) - Manufacturer Part Number: 2508056017Y2 - Package: 0805 - Role: Filter - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://fair-rite.com/print_product.php?pid=33610 - Part Type: Ferrite Bead - Manufacturer Name: Fair-Rite Products Corp. - Role Details: 600 ohm @100MHz ferrite bead for rail isolation between domains **Pins:** - 1 [pin 1] - 2 [pin 2] ### FB2 — [2508056017Y2](https://www.flux.ai/adrian95/2508056017y2~n1q.md) - Manufacturer Name: Fair-Rite Products Corp. - Part Type: Ferrite Bead - Role: Filter - Package: 0805 - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://fair-rite.com/print_product.php?pid=33610 - Manufacturer Part Number: 2508056017Y2 - Role Details: 600 ohm @100MHz ferrite bead for rail isolation between domains **Pins:** - 1 [pin 1] - 2 [pin 2] ### FB3 — [2508056017Y2](https://www.flux.ai/adrian95/2508056017y2~n1q.md) - Part Type: Ferrite Bead - Manufacturer Name: Fair-Rite Products Corp. - Role Details: 600 ohm @100MHz ferrite bead for rail isolation between domains - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://fair-rite.com/print_product.php?pid=33610 - Package: 0805 - Manufacturer Part Number: 2508056017Y2 - Role: Filter **Pins:** - 1 [pin 1] - 2 [pin 2] ### FB4 — [2508056017Y2](https://www.flux.ai/adrian95/2508056017y2~n1q.md) - Manufacturer Name: Fair-Rite Products Corp. - Part Type: Ferrite Bead - Role Details: 600 ohm @100MHz ferrite bead for rail isolation between domains - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://fair-rite.com/print_product.php?pid=33610 - Package: 0805 - Role: Filter - Manufacturer Part Number: 2508056017Y2 **Pins:** - 1 [pin 1] - 2 [pin 2] ### FB5 — [2508056017Y2](https://www.flux.ai/adrian95/2508056017y2~n1q.md) - Datasheet URL: https://fair-rite.com/print_product.php?pid=33610 - License: https://creativecommons.org/licenses/by/4.0/ - Package: 0805 - Role: Filter - Manufacturer Part Number: 2508056017Y2 - Manufacturer Name: Fair-Rite Products Corp. - Part Type: Ferrite Bead - Role Details: 600 ohm @100MHz ferrite bead for rail isolation between domains **Pins:** - 1 [pin 1] - 2 [pin 2] ### FB6 — [2508056017Y2](https://www.flux.ai/adrian95/2508056017y2~n1q.md) - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://fair-rite.com/print_product.php?pid=33610 - Package: 0805 - Manufacturer Part Number: 2508056017Y2 - Role: Filter - Role Details: 600 ohm @100MHz ferrite bead for rail isolation between domains - Part Type: Ferrite Bead - Manufacturer Name: Fair-Rite Products Corp. **Pins:** - 1 [pin 1] - 2 [pin 2] ### IC1 — [MCP1825S-3302E/DB](https://www.flux.ai/adrian95/mcp1825s-3302edb~3re.md) - Manufacturer Name: Microchip - Role Details: 3x 3.3V LDOs for separate rails: +3V3_DSP_DIG, +3V3_MCU, +3V3_DIG_AUDIO (isolate domains with beads) - License: https://creativecommons.org/licenses/by/4.0/ - Role: Regulator - Part Type: Power Management - Package or Case Code: SOT230P700X180-4N - Manufacturer Part Number: MCP1825S-3302E/DB - Datasheet URL: https://datasheet.datasheetarchive.com/originals/distributors/SFDatasheet-4/sf-00090042.pdf - Package: SOT-223 **Pins:** - GND_(TAB)_1 [pin 2] - GND_(TAB)_2 [pin 4] - VIN [pin 1] - VOUT [pin 3] ### IC2 — [MCP1825S-3302E/DB](https://www.flux.ai/adrian95/mcp1825s-3302edb~3re.md) - Datasheet URL: https://datasheet.datasheetarchive.com/originals/distributors/SFDatasheet-4/sf-00090042.pdf - Package or Case Code: SOT230P700X180-4N - Manufacturer Part Number: MCP1825S-3302E/DB - Package: SOT-223 - Role: Regulator - Role Details: 3x 3.3V LDOs for separate rails: +3V3_DSP_DIG, +3V3_MCU, +3V3_DIG_AUDIO (isolate domains with beads) - Manufacturer Name: Microchip - Part Type: Power Management - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - GND_(TAB)_1 [pin 2] - GND_(TAB)_2 [pin 4] - VIN [pin 1] - VOUT [pin 3] ### IC3 — [MCP1825S-3302E/DB](https://www.flux.ai/adrian95/mcp1825s-3302edb~3re.md) - Manufacturer Name: Microchip - License: https://creativecommons.org/licenses/by/4.0/ - Package: SOT-223 - Part Type: Power Management - Manufacturer Part Number: MCP1825S-3302E/DB - Package or Case Code: SOT230P700X180-4N - Datasheet URL: https://datasheet.datasheetarchive.com/originals/distributors/SFDatasheet-4/sf-00090042.pdf - Role: Regulator - Role Details: 3x 3.3V LDOs for separate rails: +3V3_DSP_DIG, +3V3_MCU, +3V3_DIG_AUDIO (isolate domains with beads) **Pins:** - GND_(TAB)_1 [pin 2] - GND_(TAB)_2 [pin 4] - VIN [pin 1] - VOUT [pin 3] ### J1 — [282837-2](https://www.flux.ai/vasy_skral/282837-2~69k.md) - Manufacturer Part Number: 282837-2 - Part Type: Connector - Role Details: 12V automotive input (VIN_12V and GND) - Package: THT 5.08mm - Manufacturer Name: TE Connectivity AMP Connectors - Role: Connector - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=282837&DocType=Customer+Drawing&DocLang=English **Pins:** - 1 [pin 1] - 2 [pin 2] ### J2 — [RCJ-041](https://www.flux.ai/adrian95/rcj-041~n1m.md) - License: https://creativecommons.org/licenses/by/4.0/ - Role: Connector - Part Type: Connector - Datasheet URL: https://www.cuidevices.com/product/resource/rcj-04x.pdf - Role Details: Coax SPDIF input; connect to CS8416 input network - Package: RCA jack - Manufacturer Part Number: RCJ-041 - Manufacturer Name: CUI Devices **Pins:** - 1 [pin 1] - 2 [pin 2] ### J3 — [DF40HC(3.0)-100DS-0.4V(51)](https://www.flux.ai/jecstronic/df40hc3p0-100ds-0p4v51~a1a.md) - Datasheet URL: https://www.mouser.com/datasheet/2/185/DF40_Catalog_D31649_en-2301840.pdf - Package: Mezzanine 100pos 0.4mm - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Hirose Electric Co Ltd - Manufacturer Part Number: DF40HC(3.0)-100DS-0.4V(51) - Part Type: Connector - Role Details: Output connector to external RCA board; placeholder high-density mezzanine; map DACx_CHy_P/N consistently - Role: Connector **Pins:** - 1 [pin 1] - 10 [pin 10] - 100 [pin 100] - 11 [pin 11] - 12 [pin 12] - 13 [pin 13] - 14 [pin 14] - 15 [pin 15] - 16 [pin 16] - 17 [pin 17] - 18 [pin 18] - 19 [pin 19] - 2 [pin 2] - 20 [pin 20] - 21 [pin 21] - 22 [pin 22] - 23 [pin 23] - 24 [pin 24] - 25 [pin 25] - 26 [pin 26] - 27 [pin 27] - 28 [pin 28] - 29 [pin 29] - 3 [pin 3] - 30 [pin 30] - 31 [pin 31] - 32 [pin 32] - 33 [pin 33] - 34 [pin 34] - 35 [pin 35] - 36 [pin 36] - 37 [pin 37] - 38 [pin 38] - 39 [pin 39] - 4 [pin 4] - 40 [pin 40] - 41 [pin 41] - 42 [pin 42] - 43 [pin 43] - 44 [pin 44] - 45 [pin 45] - 46 [pin 46] - 47 [pin 47] - 48 [pin 48] - 49 [pin 49] - 5 [pin 5] - 50 [pin 50] - 51 [pin 51] - 52 [pin 52] - 53 [pin 53] - 54 [pin 54] - 55 [pin 55] - 56 [pin 56] - 57 [pin 57] - 58 [pin 58] - 59 [pin 59] - 6 [pin 6] - 60 [pin 60] - 61 [pin 61] - 62 [pin 62] - 63 [pin 63] - 64 [pin 64] - 65 [pin 65] - 66 [pin 66] - 67 [pin 67] - 68 [pin 68] - 69 [pin 69] - 7 [pin 7] - 70 [pin 70] - 71 [pin 71] - 72 [pin 72] - 73 [pin 73] - 74 [pin 74] - 75 [pin 75] - 76 [pin 76] - 77 [pin 77] - 78 [pin 78] - 79 [pin 79] - 8 [pin 8] - 80 [pin 80] - 81 [pin 81] - 82 [pin 82] - 83 [pin 83] - 84 [pin 84] - 85 [pin 85] - 86 [pin 86] - 87 [pin 87] - 88 [pin 88] - 89 [pin 89] - 9 [pin 9] - 90 [pin 90] - 91 [pin 91] - 92 [pin 92] - 93 [pin 93] - 94 [pin 94] - 95 [pin 95] - 96 [pin 96] - 97 [pin 97] - 98 [pin 98] - 99 [pin 99] ### J4 — [Pin Header 01x03 2.54mm Horizontal](https://www.flux.ai/adrian95/pin-header-01x03-254mm-horizontal~tgh.md) - License: https://creativecommons.org/licenses/by/4.0/ - Package: THT 2.54mm 1x3 - Role Details: UART debug header: GND, UART_TX, UART_RX - Role: Connector - Part Type: Connector **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] ### J5 — [2x5 Pin Shrouded Header](https://www.flux.ai/rex-flux/2x5-pin-shrouded-header~tg.md) - Role: Connector - Manufacturer Name: Würth Elektronik - Role Details: Optional I2S header: MCLK, I2S_BCLK, I2S_LRCLK, I2S_DATA, 3V3, GND - Datasheet URL: https://www.we-online.com/catalog/datasheet/61201021621.pdf - Package: THT 2.54mm 2x5 - Manufacturer Part Number: 61201021621 - Part Type: Connector **Pins:** - P1 [pin 1] - P10 [pin 10] - P2 [pin 2] - P3 [pin 3] - P4 [pin 4] - P5 [pin 5] - P6 [pin 6] - P7 [pin 8] - P7 [pin 7] - P9 [pin 9] ### U1 — [ADAU1467WBCPZ300](https://www.flux.ai/lcsc/adau1467wbcpz300~pfpy.md) - LCSC Part Number: C654415 - Package: LFCSP-88 - Manufacturer Name: ADI(亚德诺)/LINEAR(凌特) - Role Details: ADAU1467 SigmaDSP; TDM8 out to 2x DAC; I2C control from ESP32; SPI boot from flash - JLCPCB Part Class: Extended Part - Role: DSP - Manufacturer Part Number: ADAU1467WBCPZ300 - Package or Case Code: LFCSP-88_L12.0-W12.0-P0.50-BL-EP5.3 **Pins:** - ~{RESET} [pin 28] - AGND [pin 8] - AUXADC0 [pin 10] - AUXADC1 [pin 11] - AUXADC2 [pin 12] - AUXADC3 [pin 13] - AUXADC4 [pin 14] - AUXADC5 [pin 15] - AUXADC6 [pin 16] - AUXADC7 [pin 17] - AVDD [pin 9] - BCLK_IN0 [pin 73] - BCLK_IN1 [pin 76] - BCLK_IN2 [pin 81] - BCLK_IN3 [pin 84] - BCLK_OUT0 [pin 48] - BCLK_OUT1 [pin 51] - BCLK_OUT2 [pin 56] - BCLK_OUT3 [pin 59] - CLKOUT [pin 27] - DGND [pin 66] - DGND [pin 88] - DGND [pin 36] - DGND [pin 29] - DGND [pin 1] - DGND [pin 45] - DGND [pin 23] - DGND [pin 67] - DGND [pin 21] - DGND [pin 44] - DVDD [pin 65] - DVDD [pin 43] - DVDD [pin 87] - DVDD [pin 24] - EP [pin 89] - IOVDD [pin 37] - IOVDD [pin 68] - IOVDD [pin 22] - IOVDD [pin 46] - IOVDD [pin 2] - LRCLK_IN0/MP10 [pin 74] - LRCLK_IN1/MP11 [pin 77] - LRCLK_IN2/MP12 [pin 82] - LRCLK_IN3/MP13 [pin 85] - LRCLK_OUT0/MP4 [pin 47] - LRCLK_OUT1/MP5 [pin 50] - LRCLK_OUT2/MP8 [pin 55] - LRCLK_OUT3/MP9 [pin 58] - MISO/SDA [pin 38] - MOSI_M/MP1 [pin 33] - MOSI/ADDR1 [pin 40] - MP14 [pin 6] - MP15 [pin 7] - MP6 [pin 53] - MP7 [pin 54] - PGND [pin 18] - PLLFILT [pin 20] - PVDD [pin 19] - SCL_M/SCLK_M/MP2 [pin 34] - SCL2_M/MP24 [pin 30] - SCLK/SCL [pin 39] - SDA_M/MISO_M/MP3 [pin 35] - SDA2_M/MP25 [pin 31] - SDATA_IN0 [pin 75] - SDATA_IN1 [pin 78] - SDATA_IN2 [pin 83] - SDATA_IN3 [pin 86] - SDATA_OUT0 [pin 49] - SDATA_OUT1 [pin 52] - SDATA_OUT2 [pin 57] - SDATA_OUT3 [pin 60] - SDATAIO0/MP16 [pin 72] - SDATAIO1/MP17 [pin 71] - SDATAIO2/MP18 [pin 70] - SDATAIO3/MP19 [pin 69] - SDATAIO4/MP20 [pin 64] - SDATAIO5/MP21 [pin 63] - SDATAIO6/MP22 [pin 62] - SDATAIO7/MP23 [pin 61] - SELFBOOT [pin 42] - SPDIFIN [pin 4] - SPDIFOUT [pin 5] - SS_M/MP0 [pin 32] - SS/ADDR0 [pin 41] - THD_M [pin 79] - THD_P [pin 80] - VDRIVE [pin 3] - XTALIN/MCLK [pin 25] - XTALOUT [pin 26] ### U10 — [OPA1678IDR](https://www.flux.ai/jecstronic/opa1678idr~6jl.md) - Package: SOIC-8 - Role: Temporary Placeholder - Manufacturer Part Number: OPA1678IDR - Part Type: Operational Amplifier (OP-AMP) - Role Details: Placeholder for OPA1652 dual op-amp; 8x dual provides 16 channels buffering; to be replaced later - Manufacturer Name: Texas Instruments - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fopa1678 **Pins:** - -IN A [pin 2] - -IN B [pin 6] - +IN A [pin 3] - +IN B [pin 5] - OUT A [pin 1] - OUT B [pin 7] - V- [pin 4] - V+ [pin 8] ### U11 — [OPA1678IDR](https://www.flux.ai/jecstronic/opa1678idr~6jl.md) - Role: Temporary Placeholder - Manufacturer Name: Texas Instruments - Role Details: Placeholder for OPA1652 dual op-amp; 8x dual provides 16 channels buffering; to be replaced later - Package: SOIC-8 - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fopa1678 - Manufacturer Part Number: OPA1678IDR - Part Type: Operational Amplifier (OP-AMP) **Pins:** - -IN A [pin 2] - -IN B [pin 6] - +IN A [pin 3] - +IN B [pin 5] - OUT A [pin 1] - OUT B [pin 7] - V- [pin 4] - V+ [pin 8] ### U12 — [OPA1678IDR](https://www.flux.ai/jecstronic/opa1678idr~6jl.md) - Manufacturer Name: Texas Instruments - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fopa1678 - Role: Temporary Placeholder - Role Details: Placeholder for OPA1652 dual op-amp; 8x dual provides 16 channels buffering; to be replaced later - Manufacturer Part Number: OPA1678IDR - Part Type: Operational Amplifier (OP-AMP) - Package: SOIC-8 **Pins:** - -IN A [pin 2] - -IN B [pin 6] - +IN A [pin 3] - +IN B [pin 5] - OUT A [pin 1] - OUT B [pin 7] - V- [pin 4] - V+ [pin 8] ### U13 — [OPA1678IDR](https://www.flux.ai/jecstronic/opa1678idr~6jl.md) - Manufacturer Name: Texas Instruments - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fopa1678 - Part Type: Operational Amplifier (OP-AMP) - Manufacturer Part Number: OPA1678IDR - Package: SOIC-8 - Role: Temporary Placeholder - Role Details: Placeholder for OPA1652 dual op-amp; 8x dual provides 16 channels buffering; to be replaced later **Pins:** - -IN A [pin 2] - -IN B [pin 6] - +IN A [pin 3] - +IN B [pin 5] - OUT A [pin 1] - OUT B [pin 7] - V- [pin 4] - V+ [pin 8] ### U14 — [OPA1678IDR](https://www.flux.ai/jecstronic/opa1678idr~6jl.md) - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fopa1678 - Manufacturer Name: Texas Instruments - Package: SOIC-8 - Role Details: Placeholder for OPA1652 dual op-amp; 8x dual provides 16 channels buffering; to be replaced later - Manufacturer Part Number: OPA1678IDR - Role: Temporary Placeholder - Part Type: Operational Amplifier (OP-AMP) **Pins:** - -IN A [pin 2] - -IN B [pin 6] - +IN A [pin 3] - +IN B [pin 5] - OUT A [pin 1] - OUT B [pin 7] - V- [pin 4] - V+ [pin 8] ### U15 — [OPA1678IDR](https://www.flux.ai/jecstronic/opa1678idr~6jl.md) - Manufacturer Name: Texas Instruments - Role: Temporary Placeholder - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fopa1678 - Role Details: Placeholder for OPA1652 dual op-amp; 8x dual provides 16 channels buffering; to be replaced later - Package: SOIC-8 - Part Type: Operational Amplifier (OP-AMP) - Manufacturer Part Number: OPA1678IDR **Pins:** - -IN A [pin 2] - -IN B [pin 6] - +IN A [pin 3] - +IN B [pin 5] - OUT A [pin 1] - OUT B [pin 7] - V- [pin 4] - V+ [pin 8] ### U16 — [AP2127N3-1.2](https://www.flux.ai/kicad-part-library/ap2127n3-1p2~f5b.md) - Role: Regulator - Role Details: +1V2_DSP_CORE LDO (from +5V_MAIN) for ADAU1467 core supply - Manufacturer Name: Texas Instruments Inc. - Package or Case Code: TSOT-23 - Manufacturer Part Number: AP2127N3-1.2 - Package: SOT-23-3 - Datasheet URL: https://www.diodes.com/assets/Datasheets/AP2127.pdf **Pins:** - GND [pin 1] - VI [pin 3] - VO [pin 2] ### U17 — [TPS7A0533PDBVT](https://www.flux.ai/adrian95/tps7a0533pdbvt~ul1.md) - Datasheet URL: https://www.ti.com/lit/ds/symlink/tps7a05.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Role: Regulator - Part Type: Integrated Circuit - Manufacturer Name: Texas Instruments - Role Details: +3V3_CLK_LN low-noise rail for NSA3579D oscillator and NB3L553 clock buffer - Manufacturer Part Number: TPS7A0533PDBVT - Package: SOT-23-5 **Pins:** - EN [pin 3] - GND [pin 2] - IN [pin 1] - NC [pin 4] - OUT [pin 5] ### U18 — [ESP32-WROOM-32E](https://www.flux.ai/vasyl/esp32-wroom-32e~epi.md) - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32_datasheet_en.pdf - Manufacturer Name: Espressif Systems - Package: Module - Manufacturer Part Number: ESP32-WROOM-32 - Part Type: Integrated Circuit - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: ESP32 controller; I2C master to ADAU1467; UART debug; keep RF zone isolated from clock island and analog outputs - Role: MCU **Pins:** - EN [pin 3] - GND [pin 38] - GND [pin 39] - GND [pin 15] - GND [pin 1] - IO0 [pin 25] - IO12 [pin 14] - IO13 [pin 16] - IO14 [pin 13] - IO15 [pin 23] - IO16 [pin 27] - IO17 [pin 28] - IO18 [pin 30] - IO19 [pin 31] - IO2 [pin 24] - IO21 [pin 33] - IO22 [pin 36] - IO23 [pin 37] - IO25 [pin 10] - IO26 [pin 11] - IO27 [pin 12] - IO32 [pin 8] - IO33 [pin 9] - IO34 [pin 6] - IO35 [pin 7] - IO4 [pin 26] - IO5 [pin 29] - NC [pin 32] - RXD0/IO3 [pin 34] - SCK/CLK [pin 20] - SCS/CMD [pin 19] - SDI/SD1 [pin 22] - SDO/SD0 [pin 21] - SENSOR_VN [pin 5] - SENSOR_VP [pin 4] - SHD/SD2 [pin 17] - SWP/SD3 [pin 18] - TXD0/IO1 [pin 35] - VDD [pin 2] ### U2 — [W25Q64JVSSIQ](https://www.flux.ai/lcsc/w25q64jvssiq~ias3.md) - JLCPCB Part Class: Extended Part - Voltage Supply: 2.7 ~ 3.6V - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/1912211532_Winbond-Elec-W25Q64JVSSIQ_C179171.pdf - Role Details: SPI NOR flash for ADAU1467 boot image - Operating Temperature: -40°C ~ 85°C (TA) - Role: Memory - Frequency: 133MHz - Package or Case Code: SOIC-8_L5.3-W5.3-P1.27-LS8.0-BL - Part Type: NOR FLASH - Product Info Url: https://lcsc.com/product-detail/New-Arrivals_Winbond-Elec-W25Q64JVSSIQ_C179171.html - Manufacturer Part Number: W25Q64JVSSIQ - LCSC Part Number: C179171 - Package: SOIC-8 - Manufacturer Name: WINBOND(华邦) **Pins:** - ~{CS} [pin 1] - CLK [pin 6] - DI(IO0) [pin 5] - DO(IO1) [pin 2] - GND [pin 4] - HOLD#orRESET#(IO3) [pin 7] - VCC [pin 8] - WP#(IO2) [pin 3] ### U3 — [CS8416-CSZ](https://www.flux.ai/lcsc/cs8416-csz~ccg1.md) - Manufacturer Name: Cirrus Logic(凌云) - JLCPCB Part Class: Extended Part - Package or Case Code: SOIC-28_L17.9-W7.5-P1.27-LS10.3-BL - Role: Temporary Placeholder - LCSC Part Number: C1519978 - Role Details: Placeholder for AK4118 SPDIF receiver; use for schematic connectivity only; to be replaced later - Manufacturer Part Number: CS8416-CSZ - Package: CSZ **Pins:** - ~{RST} [pin 9] - AD0/~{CS} [pin 14] - AD1/CDIN [pin 15] - AD2/GPO2 [pin 18] - AGND [pin 7] - DGND [pin 22] - FILT [pin 8] - GPO0 [pin 20] - GPO1 [pin 19] - OLRCK [pin 28] - OMCK [pin 25] - OSCLK [pin 27] - RMCK [pin 24] - RXN [pin 5] - RXP0 [pin 4] - RXP1 [pin 3] - RXP2 [pin 2] - RXP3 [pin 1] - RXP4 [pin 10] - RXP5 [pin 11] - RXP6 [pin 12] - RXP7 [pin 13] - SCL/CCLK [pin 16] - SDA/CDOUT [pin 17] - SDOUT [pin 26] - VA [pin 6] - VD [pin 23] - VL [pin 21] ### U4 — [AK4458VN](https://www.flux.ai/jecstronic/ak4458vn~ynx.md) - Package: AK4458VN - Manufacturer Part Number: AK4458VN - Role: DAC - Role Details: AK4458 DAC; one device for CH1-8, one for CH9-16; receives TDM8 from ADAU1467 - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.akm.com/content/dam/documents/products/audio/audio-dac/ak4458vn/ak4458vn-en-datasheet.pdf - Manufacturer Name: Asahi Kasei Microdevices/AKM - Part Type: Integrated Circuit **Pins:** - AVDD [pin 31] - AVSS [pin 30] - BICK/DCLK [pin 2] - CAD0-I2C/CSN/DIF [pin 15] - CAD1/DCHAIN [pin 12] - DSDL4 [pin 9] - DSDR3 [pin 8] - DSDR4 [pin 10] - DVSS [pin 46] - DZF/SMUTE [pin 11] - I2C [pin 17] - LDOE [pin 44] - LRCK [pin 3] - MCLK [pin 1] - OUTL1- [pin 19] - OUTL1+ [pin 18] - OUTL2- [pin 25] - OUTL2+ [pin 24] - OUTL3- [pin 33] - OUTL3+ [pin 32] - OUTL4- [pin 39] - OUTL4+ [pin 38] - OUTR1- [pin 22] - OUTR1+ [pin 23] - OUTR2- [pin 28] - OUTR2+ [pin 29] - OUTR3- [pin 36] - OUTR3+ [pin 37] - OUTR4- [pin 42] - OUTR4+ [pin 43] - PDN [pin 48] - PS/CAD0-SPI [pin 16] - SCL [pin 14] - SDA [pin 13] - SDTI1 [pin 4] - SDTI2 [pin 5] - SDTI3 [pin 6] - SDTI4 [pin 7] - TVDD [pin 45] - VDD18 [pin 47] - VREFH1 [pin 21] - VREFH2 [pin 27] - VREFH3 [pin 34] - VREFH4 [pin 40] - VREFL1 [pin 20] - VREFL2 [pin 26] - VREFL3 [pin 35] - VREFL4 [pin 41] ### U5 — [AK4458VN](https://www.flux.ai/jecstronic/ak4458vn~ynx.md) - Role: DAC - Package: AK4458VN - Manufacturer Part Number: AK4458VN - Manufacturer Name: Asahi Kasei Microdevices/AKM - Datasheet URL: https://www.akm.com/content/dam/documents/products/audio/audio-dac/ak4458vn/ak4458vn-en-datasheet.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Integrated Circuit - Role Details: AK4458 DAC; one device for CH1-8, one for CH9-16; receives TDM8 from ADAU1467 **Pins:** - AVDD [pin 31] - AVSS [pin 30] - BICK/DCLK [pin 2] - CAD0-I2C/CSN/DIF [pin 15] - CAD1/DCHAIN [pin 12] - DSDL4 [pin 9] - DSDR3 [pin 8] - DSDR4 [pin 10] - DVSS [pin 46] - DZF/SMUTE [pin 11] - I2C [pin 17] - LDOE [pin 44] - LRCK [pin 3] - MCLK [pin 1] - OUTL1- [pin 19] - OUTL1+ [pin 18] - OUTL2- [pin 25] - OUTL2+ [pin 24] - OUTL3- [pin 33] - OUTL3+ [pin 32] - OUTL4- [pin 39] - OUTL4+ [pin 38] - OUTR1- [pin 22] - OUTR1+ [pin 23] - OUTR2- [pin 28] - OUTR2+ [pin 29] - OUTR3- [pin 36] - OUTR3+ [pin 37] - OUTR4- [pin 42] - OUTR4+ [pin 43] - PDN [pin 48] - PS/CAD0-SPI [pin 16] - SCL [pin 14] - SDA [pin 13] - SDTI1 [pin 4] - SDTI2 [pin 5] - SDTI3 [pin 6] - SDTI4 [pin 7] - TVDD [pin 45] - VDD18 [pin 47] - VREFH1 [pin 21] - VREFH2 [pin 27] - VREFH3 [pin 34] - VREFH4 [pin 40] - VREFL1 [pin 20] - VREFL2 [pin 26] - VREFL3 [pin 35] - VREFL4 [pin 41] ### U6 — [NB3L553MNR4G](https://www.flux.ai/lcsc/nb3l553mnr4g~1hps.md) - Package or Case Code: DFN-8_L2.0-W2.0-P0.50-BL-EP - Part Type: Clock Buffers, Drivers - Role: Clock Buffer - JLCPCB Part Class: Extended Part - Package: DFN-8 - Manufacturer Name: onsemi(安森美) - LCSC Part Number: C603351 - Product Info Url: https://lcsc.com/product-detail/Pre-ordered-Products_ON-Semiconductor-ON-NB3L553MNR4G_C603351.html - Role Details: Quiet clock corridor: Oscillator -> NB3L553 -> ADAU1467 + both AK4458 - Datasheet URL: https://assets.lcsc.com/datasheet/szlcsc/Download-ISO9001-Certification.pdf - Manufacturer Part Number: NB3L553MNR4G **Pins:** - EP [pin 9] - GND [pin 4] - ICLK [pin 5] - OE [pin 8] - Q0 [pin 2] - Q1 [pin 3] - Q2 [pin 6] - Q3 [pin 7] - VDD [pin 1] ### U7 — [NSA3579D](https://www.flux.ai/lcsc/nsa3579d~kjdp.md) - Manufacturer Name: NDK - LCSC Part Number: C669228 - Manufacturer Part Number: NZ2520SH-24.576MHZ/NSA3579D - Role: Temporary Placeholder - Package or Case Code: OSC-SMD_4P-L2.5-W2.0-BL - Package: 2520 4-pad - Role Details: Placeholder for NDK NZ2520SD 24.576 MHz oscillator; feeds NB3L553 MCLK fanout; to be replaced later **Pins:** - GND [pin 2] - OUTPUT [pin 3] - STAND-BY [pin 1] - VCC [pin 4] ### U8 — [OPA1678IDR](https://www.flux.ai/jecstronic/opa1678idr~6jl.md) - Role Details: Placeholder for OPA1652 dual op-amp; 8x dual provides 16 channels buffering; to be replaced later - Manufacturer Name: Texas Instruments - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fopa1678 - Part Type: Operational Amplifier (OP-AMP) - Manufacturer Part Number: OPA1678IDR - Package: SOIC-8 - Role: Temporary Placeholder **Pins:** - -IN A [pin 2] - -IN B [pin 6] - +IN A [pin 3] - +IN B [pin 5] - OUT A [pin 1] - OUT B [pin 7] - V- [pin 4] - V+ [pin 8] ### U9 — [OPA1678IDR](https://www.flux.ai/jecstronic/opa1678idr~6jl.md) - Part Type: Operational Amplifier (OP-AMP) - Manufacturer Part Number: OPA1678IDR - Manufacturer Name: Texas Instruments - Package: SOIC-8 - Role Details: Placeholder for OPA1652 dual op-amp; 8x dual provides 16 channels buffering; to be replaced later - Role: Temporary Placeholder - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fopa1678 **Pins:** - -IN A [pin 2] - -IN B [pin 6] - +IN A [pin 3] - +IN B [pin 5] - OUT A [pin 1] - OUT B [pin 7] - V- [pin 4] - V+ [pin 8] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/ajey/dsp~iz](https://www.flux.ai/ajey/dsp~iz).* --- *Generated from [https://www.flux.ai/ajey/dsp~iz](https://www.flux.ai/ajey/dsp~iz)*