Gain and Offset Calibration of the Analog Signal Conditioning (OPAMP) Peripheral

A new feature introduced in the AVR® DB MCU is the Analog Signal Conditioning (OPAMP) peripheral. The OPAMP peripheral can be configured as a PGA, in this example the internal DAC and ADC are used to calibrate gain and offset for the PGA. For more information on the calibration procedure, see the application note.

Related Documentation

• AN3633 - Gain and Offset Calibration of the Analog Signal Conditioning (OPAMP) Peripheral
• AVR128DB48 Curiosity Nano User Guide
• AVR128DB48 Device Page

Software Used

• Atmel Studio 7.0.2397 or later
• Atmel Studio AVR-Dx_DFP version 1.3.67 or later
• For the MPLAB X version of this project, please go to this repository

Hardware Used

• AVR128DB48 Curiosity Nano

Setup

• No external hardware setup needed

Operation

• Connect the AVR128DB48 Curiosity Nano to a computer using a USB cable
• Download the zip file or clone the example to get the source code
• Open the .atsln file with Atmel Studio
• Press Start Without Debugging (CTRL+ALT+F5) to run the application

Conclusion

After going through this example you should be able to calibrate the gain and offset of the OPAMP configured as a PGA.