CN-0206 is a circuit board which includes AD7793 3-channel, low noise, low power, 24-bit Σ-Δ ADC and ADuC832 precision analog microcontroller. It is used to build a thermocouple measurement system.
This document presents Circuit Note CN-0206, a complete thermocouple measurement system designed for quick system integration. The circuit utilizes the AD7793 24-bit sigma-delta ADC as the analog front end, which includes a programmable gain amplifier, internal reference, and excitation currents to simplify thermocouple design. The system is engineered to measure temperatures from 0°C to +60°C with a peak-to-peak noise of approximately 0.02°C.
| Measurement Range | 0°C to +60°C |
|---|---|
| System Noise | 0.02°C peak-to-peak |
| Power Down Consumption | 1 µA maximum |
| Thermocouple Type | Type T |
| Output Data Rate | 16.7 Hz |
The useful measurement range of the circuit is from 0°C to +60°C because the circuit tested does not include linearization.
The system noise is approximately 0.02°C peak-to-peak.