The reference voltage for the device is derived from an internal band-gap reference. A buffered version of the reference voltage is available at the BG pin for user convenience. This output has an output-current capability of ±100 µA. The BG output must be buffered if more current is required. No provision exists for the use of an external reference voltage, but the full-scale input voltage can be adjusted through the full-scale-range register settings. Note that the VA11 supply voltage should be used to set the output common-mode voltage of a front-end fully-differential amplifier and the BG output should not be used for this purpose.