4 layers51 × 77 mm
2 layers10 × 10 mm
Ads1220
badjeff/ads1220-pcb8Texas Instruments ADS1220 ADC sensor breakout board.
- Size
- 10 × 10 mm
- Copper layers
- 2
- Thickness
- 1 mm
- Parts
- 18
- Nets
- 18
- Pads
- 55
- Tracks, vias
- 149, 12
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 12 May 2026
- Updated
- 17 Oct 2026
Overview
Ads1220 is an open-source printed circuit board by badjeff, from the badjeff/ads1220-pcb repository on GitHub. It is a 2-layer board of 10 × 10 mm with 18 parts on 18 nets, routed with 149 tracks and 12 vias.
It is built around the ADS1220IRVAR. Its parts include 11 resistors, 4 connectors, 2 capacitors and 1 IC. It belongs with the sensors and measurement and interfaces and adapters boards of this library.
Main components
1README
README.mdADS1220 PCB
Texas Instruments ADS1220 ADC sensor breakout board.
- Designed for measuring wheatstone bridge circuit on Lenovo ThinkPad T440 series trackpoint sensor.
- Be operated with 3.3V voltage level ONLY.
- Unipolar Analog Power Supply ONLY.
- Outlined as small as possible for bottom mount on low profile keyboards.
- Designed for driving trackpoint sensor on ZMK with ads1220-zephyr-module and analog-axis-hires-input-zephyr-module.
Figure 1: Size comparing to Thinkpad T440 trackpoint sensor. See the wiring here
PCB
Online preview avaliable here, powered by KiCanvas.
Figure 2: PCB edgecuts dimension
Figure 3: PCB 3D View - 1.0mm FR4
Figure 4: Schematic
BOM
| Designator | Footprint | Quantity | Value | LCSC Part # |
|---|---|---|---|---|
| C1,C2 | SMD 0402 | 2 | 100nF | C1525 |
| R1,R2,R3,R4 | SMD 0402 | 4 | 47R | C137973 |
| R5,R6 | SMD 0402 | 2 | 2K4 (for V+ Ref) | C112296 |
| R7 | SMD 0402 | 1 | 0R (for V- Ref) | C106231 |
| U1 | ADS1220IRVAR | 1 | VQFN-16-EP(3.5x3.5) | C2651338 |
| J1 | 1.27mm Pin header | 1 | 1x5 | - |
| J2,J4 | 1.27mm Pin header | 2 | 1x2 | - |
| J3 | 1.27mm Pin header | 1 | 1x4 | - |
- SMD 0402 (Imperial) aka 1005 Metric.
Board Characteristics
- Copper layer count: 2
- Board thickness: 1.0 mm
- Board overall dimensions: 10.0 x 10.0 mm
License
Available under the CERN-OHL-P v2 permissive license.
Parts
18| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 0R | Resistor_SMD:R_0402_1005Metric | R7, R8, R9, R10, R11 |
| 4 | 47R | Resistor_SMD:R_0402_1005Metric | R1, R2, R3, R4 |
| 2 | 0.1uF | Capacitor_SMD:C_0402_1005Metric | C1, C2 |
| 2 | 2K4 | Resistor_SMD:R_0402_1005Metric | R5, R6 |
| 2 | Conn_01x02_Socket | Connector_PinHeader_1.27mm:PinHeader_1x02_P1.27mm_Vertical | J2, J4 |
| 1 | ADS1220IRVAR | ads1220:QFN50P350X350X100-17N | U1 |
| 1 | Conn_01x05_Socket | Connector_PinHeader_1.27mm:PinHeader_1x05_P1.27mm_Vertical | J1 |
| 1 | Conn_01x06_Socket | Connector_PinHeader_1.27mm:PinHeader_1x04_P1.27mm_Vertical | J3 |
Questions
How big is the Ads1220 PCB?
It measures 10 × 10 mm and has 2 copper layers, 1 mm thick.
What parts does the Ads1220 use?
18 parts, built around the ADS1220IRVAR. 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 Ads1220 KiCad files?
From the badjeff/ads1220-pcb repository on GitHub, at the commit this page was made from: the board is ads1220.kicad_pcb and its schematic ads1220.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Ads1220 design in my own project?
Its repository states no licence, so its author keeps all rights: ask badjeff before reusing the design.
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