MUXPOS - Non-Inverting (+) Input Selection

As shown in Figure 1, the non-inverting (+) input of an op amp is connected to an analog multiplexer that allows one input source to be selected out of a variety of input sources. The source selection is configured using the MUXPOS bit field of the Op Amp n Input Multiplexer (OPAMP.OPnINMUX) register. If the OPnINMUX register is changed while the OPn output is enabled, a glitch will occur on the output signal due to the opening and closing of analog switches, and some time will elapse before the output settles to the new value.

The following non-inverting input options are available for OPn:

INP (OPnINP) - Positive input pin for OPn
WIP (OPnWIP) - Wiper from OPn’s resistor ladder
DAC - DAC output (DAC and DAC output buffer must be enabled)
GND - Ground
VDDDIV2 - V_DD/2

OP1 has the following additional input available:

LINKOUT (OP0OUT) - OP0 output

OP2 has the following additional inputs available:

LINKOUT (OP1OUT) - OP1 output
LINKWIP (OP0WIP) - Wiper from OP0’s resistor ladder