44.6.10.6 Two OPAMPs Differential Amplifier

In this mode, OPAMP0 can be coupled with OPAMP1 or OPAMP1 with OPAMP2 in order to amplify a differential signal.

To configure OPAMP0 and OPAMP1 as differential amplifier, the OPAMPCTRLx register can be configured as follows:

Table 44-7. OPAMP0 OPAMP1 Differential Amplifier (Example: R1=4R, R2=12R)
MUXPOS MUXNEG RES1MUX POTMUX RES2VCC RES2OUT RES1EN ANAOUT
OPAMP0 0000 011 011 000 0 0 0 0
OPAMP1 0000 001 010 100 0 1 1 0
OPAMP2 0000 000 000 000 0 0 0 0

To configure OPAMP1 and OPAMP2 as differential amplifier, the OPAMPCTRLx register can be configured as follows:

Table 44-8. OPAMP1 OPAMP2 Differential Amplifier (Example: R1=4R, R2=12R)
MUXPOS MUXNEG RES1MUX POTMUX RES2VCC RES2OUT RES1EN ANAOUT
OPAMP0 0000 000 000 000 0 0 0 0
OPAMP1 0000 011 011 000 0 0 0 0
OPAMP2 0000 001 010 100 0 1 1 0
Figure 44-7. OPAMP0 OPAMP1 Differential Amplifier