HardLabs

ADC pHAT AFE

kelu124·0xa5eded·hardware/v2.1/ADC_pHAT_AFE.kicad_pcb

ADC pHAT AFE PCB layout, top view — open source RP2040/RP2350 board by kelu124

About the ADC pHAT AFE PCB

ADC pHAT AFE is an open source RP2040/RP2350 PCB design by kelu124, published on GitHub under the TAPR-OHL-1.0 license. It is a 2-layer board measuring 65 × 30 mm, with 61 components from 34 distinct parts.

Its main chip is the Pico, from the RP2040/RP2350 family. Other key parts include the ADC08100CIMTCX/NOPB(TSSOP-24), LM27762, ADG621, OPA830 and TPH2501. By type, the board carries 25 capacitors, 18 resistors, 10 ICs, 3 connectors, 3 diodes and 2 inductors.

It belongs with the wearables designs in this gallery.

From the project

sha1(pHATrick)

Beware - these need to be updated with actual assembled board. v2 includes sees top going bottom and vice versa.

Signal coming out of a cheap DSO, should be around square, 4MHz

Remove i2c to something simpler - MCP40D17T Let user choose offset or not Check OPAMP capa to get a 60MHz cutoff BAV / MD0100 to be removed * Putting the rp2040 under the board, to expose the beautiful art to users

ADC pHAT AFE, from the project README
From the project README

Main components on the ADC pHAT AFE

PicoADC08100CIMTCX/NOPB(TSSOP-24)LM27762ADG621OPA830TPH2501LMH6629DAC5571TLV271LM4040DBZ-2.0

ADC pHAT AFE bill of materials (BOM)

61 components, 34 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
Pico
U1
1
ADC08100CIMTCX/NOPB(TSSOP-24)
U2
1
LM27762
U3
1
ADG621
U4
1
OPA830
U5
1
TPH2501
U6
1
LMH6629
U7
1
DAC5571
U8
1
TLV271
U9
1
LM4040DBZ-2.0
U10
1
CONN_01X02_MALE
Conn_01x02_Male
J1
1
CONN_02X20_ODD_EVEN
Conn_02x20_Odd_Even
J2
1
Conn_Coaxial
J3
3
D
D1, D2, D3
2
FerriteBead_Small
FB1, FB2
3
22UF
22uF
C1, C3, C4
5
100NF
100nF
C2, C5, C6, C7, C11
4
2.2U
2.2u
C8, C12, C13, C14
7
100N
100n
C9, C16, C17, C19, C20, C24, C25
1
1u
C10
Show 14 more
QtyPartRefs
1
4.7U
4.7u
C15
1
1p
C18
1
10N
10n
C21
1
6.8P
6.8p
C22
1
160P
160p
C23
2
87K
87k
R1, R3
1
10K
R2
2
50K
50k
R4, R7
4
1k
R5, R17, R18, R19
1
47
R8
5
100
R9, R11, R13, R14, R16
1
680
R10
1
680K
680k
R12
1
100K
100k
R15

ADC pHAT AFE design files

The KiCad project lives in the kelu124/0xa5eded repository on GitHub; these links point at the commit this page was built from.

ADC pHAT AFE: common questions

What microcontroller does the ADC pHAT AFE use?

The ADC pHAT AFE is built around the Pico, from the RP2040/RP2350 family.

How big is the ADC pHAT AFE PCB?

The ADC pHAT AFE measures 65 × 30 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the ADC pHAT AFE?

61 components, from 34 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 ADC pHAT AFE design files?

From the kelu124/0xa5eded 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 ADC pHAT AFE design in my own project?

Yes, under the terms of its TAPR-OHL-1.0 license, which kelu124 chose for the repository.

Can I test firmware for the ADC pHAT AFE without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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