High-Resolution: Low-Drift: Precision Weigh-Scale Reference Design with AC Bridge Excitation
This precision weigh-scale reference design achieves greater than 50:000 noise-free counts of resolution. Offset and offset drift errors are nearly eliminated by ac bridge excitation. This design takes advantage of the high-resolution ADS1262 delta-sigma ADC.
>50:000 noise-free count weigh-scale solution Operating temperature range: -40 ᵒC to +125 ᵒC Less than 1 μV total error across temperature range ADC Supply and Bridge Excitation Voltage: 5V Bridge Output: 0 V to 10 mV Firmware provides ADS1262 example code This robust circuit reference design includes theory: complete error analysis: component selection: simulation: PCB design: example code: and measured data that correlates with the theory and simulation.