Cascaded Inverting PGA

The OPAMPs can be configured as three cascaded, inverting PGAs using these settings in OPAMPCTRLx:

Table 1. Cascade of three inverting PGAs (Example: R1=4R, R2=12R)
  MUXPOS MUXNEG RES1MUX POTMUX RES2VCC RES2OUT RES1EN ANAOUT
OPAMP0 011 001 01 100 0 1 1 0
OPAMP1 011 001 10 100 0 1 1 0
OPAMP2 011 001 10 100 0 1 1 0
Figure 1. Cascaded Inverting PGA
Parent topic: Built-in Modes