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NOS R-2R DAC

k16shikano·r2r-dac·kicad/S2_CONTROL/S2_CONTROL.kicad_pcb

NOS R-2R DAC PCB layout, top view — open source Microchip SAM board by k16shikano
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About the NOS R-2R DAC PCB

NOS R-2R DAC is an open source Microchip SAM PCB design by k16shikano, published on GitHub. It is a 4-layer board measuring 75 × 154 mm, with 19 components from 11 distinct parts.

Its main chip is the ATSAMD21G18A-AU, from the Microchip SAM family. Other key parts include the SN74LVC1G08DBVR. By type, the board carries 8 resistors, 7 capacitors, 2 ICs and 2 connectors.

From the project

16ビットR-2RラダーによるDAコンバーターの設計

- TOSリンク（S/PDIF）からの44.1kHz入力 - ノンオーバーサンプリング - 左右2チャンネル - カードケージ構成（同一回路を1枚にまとめた SINGLEBOARD` あり）

DACCHANNEL と DACCHANNELAXIAL は同一の電気設計**で、S3 / S5 のどちらにも挿さります。 ラダー抵抗の実装方法だけが違います。

SINGLEBOARD もカードケージと同一の電気設計です。JBP とバックプレーンは無く、 R チャネルは 8xxx 参照（U8001 など）。±VREF はチャネルごとにローカル生成のままです。 信号層は F.Cu / In2.Cu / In3.Cu / B.Cu、In1.Cu と In4.Cu が GND ベタ（ラダー下は抜き）。 JRAW ヘッダ（J401 / J402` およびチャネル側）は基板上配線のタップとして残しています。

Main components on the NOS R-2R DAC

ATSAMD21G18A-AUSN74LVC1G08DBVR

NOS R-2R DAC bill of materials (BOM)

19 components, 11 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATSAMD21G18A-AU
U201
1
SN74LVC1G08DBVR
U202
1
JBP_2x18_AB
J201
1
SWD_1x5
J202
1
10UF
100nF
C201
4
100nF
C202, C203, C206, C207
2
1uF
C204, C205
3
10K
150R
R211, R212, R213
2
10K
10k
R214, R216
2
10K
100k
R215, R218
1
10K
100R
R217

NOS R-2R DAC design files

The KiCad project lives in the k16shikano/r2r-dac repository on GitHub; these links point at the commit this page was built from.

NOS R-2R DAC: common questions

What microcontroller does the NOS R-2R DAC use?

The NOS R-2R DAC is built around the ATSAMD21G18A-AU, from the Microchip SAM family.

How big is the NOS R-2R DAC PCB?

The NOS R-2R DAC measures 75 × 154 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the NOS R-2R DAC?

19 components, from 11 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the NOS R-2R DAC design files?

From the k16shikano/r2r-dac repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the NOS R-2R DAC design in my own project?

The repository has no license, so all rights stay with k16shikano. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the NOS R-2R DAC without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug Microchip SAM firmware against it before you order a PCB.

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