ADC Frontend with Filtering
Op-amp signal conditioning front-end with anti-aliasing filter and input protection. Designed for interfacing 0–5 V industrial sensors to 3.3 V MCU ADC inputs.
One-time purchase · lifetime updates
What's included
KiCad Schematic (.kicad_sch)
With filter coefficient annotation
KiCad PCB Layout (.kicad_pcb)
Analog ground split, 2-layer
Gerber + drill files
Fab-ready package
BOM (Excel + CSV)
EU distributors
Design Notes PDF
Gain, filter, protection design explanation
Filter calculator spreadsheet (.xlsx)
Recalculate for your cutoff frequency
Don't want to route it yourself?
PCB Composer assembles tiles into a ready-to-order board — no KiCad needed.
Use PCB ComposerTechnical Specifications
| Op-amp | OPA2197 (rail-to-rail, low-offset) |
| Input range | 0 V – 5 V single-ended or ±2.5 V differential |
| Output range | 0 V – 3.3 V (MCU ADC compatible) |
| Anti-aliasing | 4th-order Butterworth, 10 kHz default |
| Input protection | Diode clamps + series R to IEC 61000-4-2 ±2 kV |
| PCB size | 30 × 20 mm, 2-layer |
FAQ
What KiCad version do the files use?
All files are saved in KiCad 8.x format. They open in KiCad 7 with a one-time migration dialog.
Can I use the template in a commercial product?
Yes. Once purchased, you receive a perpetual licence to use and modify the design in any number of products, including commercial ones.
Are the BOMs kept up to date?
We review BOMs quarterly and push updates when components are discontinued or better alternatives become available. All updates are free.
What if my fab parameters differ (e.g. 4-layer board)?
The design notes explain which constraints are fab-specific. Upgrading to a 4-layer stack is straightforward and covered in the integration guide.