Fermion: MCP3424 18-Bit ADC-4 Channel with Programmable Gain Amplifier for Raspberry Pi (Breakout)
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Description
The Fermion MCP3424 breakout is a low-noise, four-channel 18-bit delta-sigma analogue-to-digital converter designed to bring high-precision analogue measurements to Raspberry Pi and Arduino boards. It is ideal for makers, students, and engineers developing sensitive data logging, instrumentation, and scientific measurement systems.
High-resolution delta-sigma conversion
The module features four differential input channels with selectable 12, 14, 16, or 18-bit resolution. Data sampling rates adjust according to precision, supporting 240 SPS at 12-bit down to 3.75 SPS at full 18-bit accuracy.
Integrated programmable gain amplifier
An on-board PGA offers gain selections of x1, x2, x4, and x8 to amplify weak input signals before conversion. This provides a differential input full scale range from plus-minus 2.048V down to plus-minus 0.512V at x4 gain.
Low-drift reference and self-calibration
A precision 2.048V on-board reference with low 15 PPM per degree Celsius drift ensures dependable baseline accuracy. The chip automatically self-calibrates internal offset and gain on every conversion cycle.
Versatile continuous and one-shot modes
Users can select between continuous sampling or power-saving one-shot conversion. In one-shot mode, the board automatically returns to a low-power standby state drawing just 300nA at 5V.
Compact I2C interface
Operating across 2.7V to 5.5V, the compact 27x16mm breakout communicates via a standard 2.54mm header I2C interface. It is suited for RTDs, thermocouples, strain gauges, weigh scales, and battery fuel gauges.
Downloads & documentation
Specifications
| Operating Voltage | 2.7 - 5.5V |
| Standy Current | 300nA （5V） |
| Operating Temperature | -40°C ~ +125°C |
| On-Board Voltage Reference | 2.048V ± 0.05%, Drift 15 PPM /°C |
| Differential Input Full Scale Range | -2.048V / PGA ~ 2.048V / PGA (e.g., PGA=4, Range is -0.512 ~ 0.512V) |
| Programmable Resolution | 12, 14, 16, 18bits |
| Programmable Data Rate | 240, 60, 15, 3.75 SPS |
| Gain Error | 0.05% (PGA = 1, 18bits) |
| Offset Error | 15uV (PGA = 1, 18bits) |
| Input Interface | 4 differential channels, PIN header of 2.54mm spacing |
| Output Interface | I2C, PIN header of 2.54mm spacing |
| Size | 27x16mm(1.06x0.63") |
In the box
| MCP3424 18-Bit ADC-4 Channel with Programmable Gain Amplifier | 1 |
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