Where can I find the ADC voltage reference?

The options available for ADC voltage reference for a device are usually specified in its datasheet under the ADC block diagram as well as in the ADC voltage reference chapter.

Some devices, besides VREF+ and VDD, also provide a Fixed Voltage Reference (FVR) as an option. It has a set voltage independent of VDD and offers selectable output levels of 1.024 V, 2.048 V or 4.096 V. The output of the FVR can be configured to supply a reference voltage to the ADC. Note that the FVR generally has a very limited current output and if you choose to use it externally, it will likely require buffering. Refer to the device data sheet for full details and specifications.

© 2024 Microchip Technology, Inc.
Notice: ARM and Cortex are the registered trademarks of ARM Limited in the EU and other countries.
Information contained on this site regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights.