36.1 Independent Gain Amplifiers
The output of the FVR is routed through two independent programmable gain amplifiers. Each amplifier can be programmed for a gain of 1x, 2x or 4x, to produce the three possible voltage levels.
The ADFVR bits
are used to enable and configure the gain amplifier settings for the reference supplied to
the ADC module. Refer to the “ADC - Analog-to-Digital Converter with Computation
Module” chapter for additional information.
The CDAFVR
bits are used to enable and configure the gain amplifier settings for the reference
supplied to the DAC and comparator modules. Refer to the “DAC - Digital-to-Analog
Converter Module” and “CMP - Comparator Module” chapters for additional
information.
Refer to the figure below for the block diagram of the FVR module.
Important: Changing an analog peripheral's reference voltage
while the peripheral is enabled may cause undesirable behavior, including device resets,
oscillator drift, or reliability issues. If the analog peripheral's reference voltage must
be changed, disable the peripheral, update the reference voltage, and then re-enable the
peripheral. This applies to all analog peripherals, such as the ADC, DAC, Comparator,
etc.