4 layers95.2 × 112.5 mm
2 layers83.5 × 49 mm
PCM1681
hana/QuadI2StoAudio- Size
- 83.5 × 49 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 99
- Nets
- 85
- Pads
- 319
- Tracks, vias
- 535, 98
- Pours
- 342
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 12 May 2025
- Updated
- 22 Jun 2025
Overview
PCM1681 is an open-source printed circuit board by hana, from the hana/QuadI2StoAudio repository on GitHub. It is a 2-layer board of 83.5 × 49 mm with 99 parts on 85 nets, routed with 535 tracks and 98 vias.
It is built around the AMS1117-3.3 and PCM1681PWP. Its parts include 46 resistors, 38 capacitors, 9 connectors, 5 ICs and 1 switch.
Main components
2
AMS1117-3.3
SOT-223-40℃~+125℃ 0.003%Vout 1 1.1V@(800mA) 15V 1A 3.3V 5mA 72dB@(120Hz) Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAdvanced Monolithic SystemsVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsPCM1681PWP
HTSSOP-28-EP-40℃~+85℃ 24 4.5V~5.5V 8 SPI、I2C HTSSOP-28-EP ADCs/DACs - Special Purpose ROHSTexas InstrumentsADCs/DACs - Special Purpose
README
README.mdQuadI2StoAudio
Parts
99| Qty | Value | Footprint | References |
|---|---|---|---|
| 15 | 10u | Capacitor_SMD:C_0402_1005Metric | C1, C2, C10, C11, C12, C13, C14, C23, C24, C25, C26, C27, C28, C37, C38 |
| 10 | 5.1k | Resistor_SMD:R_0402_1005Metric | R2, R3, R15, R16, R17, R18, R31, R32, R33, R34 |
| 8 | 47 | Resistor_SMD:R_0603_1608Metric | R27, R28, R29, R30, R43, R44, R45, R46 |
| 8 | 4700p | Capacitor_SMD:C_0402_1005Metric | C15, C16, C17, C18, C29, C30, C31, C32 |
| 8 | 470p | Capacitor_SMD:C_0603_1608Metric | C19, C20, C21, C22, C33, C34, C35, C36 |
| 8 | 560 | Resistor_SMD:R_0603_1608Metric | R23, R24, R25, R26, R39, R40, R41, R42 |
| 8 | 8.2k | Resistor_SMD:R_0603_1608Metric | R19, R20, R21, R22, R35, R36, R37, R38 |
| 7 | 20 | Resistor_SMD:R_0603_1608Metric | R4, R5, R6, R7, R8, R9, R10 |
| 4 | 10n | Capacitor_SMD:C_0402_1005Metric | C5, C7, C8, C9 |
| 4 | AudioJack4 | Connector_Audio:Jack_3.5mm_PJ320D_Horizontal | J6, J7, J8, J9 |
| 3 | 1u | Capacitor_SMD:C_0402_1005Metric | C3, C4, C6 |
| 3 | Conn_01x05_Pin | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | J3, J4, J5 |
| 2 | 220k | Resistor_SMD:R_0603_1608Metric | R13, R14 |
| 2 | OPA1679IRUMx | Package_DFN_QFN:QFN-16-1EP_4x4mm_P0.65mm_EP2.1x2.1mm | U4, U5 |
| 1 | 0 | Resistor_SMD:R_0402_1005Metric | R1 |
| 1 | 10k | Resistor_SMD:R_0402_1005Metric | R11 |
| 1 | 30k | Resistor_SMD:R_0603_1608Metric | R12 |
| 1 | AMS1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U1 |
| 1 | Conn_01x10_Pin | Connector_PinHeader_2.54mm:PinHeader_1x10_P2.54mm_Vertical | J2 |
| 1 | NJW4191M | Package_SO:SOIC-8_5.3x5.3mm_P1.27mm | U2 |
| 1 | PCM1681 | Package_SO:HTSSOP-28-1EP_4.4x9.7mm_P0.65mm_EP2.75x6.2mm | U3 |
| 1 | SW_DIP_x04 | Button_Switch_SMD:SW_DIP_SPSTx04_Slide_KingTek_DSHP04TJ_W5.25mm_P1.27mm_JPin | SW1 |
| 1 | USB_C_Receptacle_PowerOnly_6P | Connector_USB:USB_C_Receptacle_GCT_USB4125-xx-x_6P_TopMnt_Horizontal | J1 |
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Questions
How big is the PCM1681 PCB?
It measures 83.5 × 49 mm and has 2 copper layers, 1.6 mm thick.
What parts does the PCM1681 use?
99 parts, built around the AMS1117-3.3 and PCM1681PWP. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the PCM1681 KiCad files?
From the hana/QuadI2StoAudio repository on GitHub, at the commit this page was made from: the board is PCM1681.kicad_pcb and its schematic LPF.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the PCM1681 design in my own project?
Its repository states no licence, so its author keeps all rights: ask hana before reusing the design.