Figure 170. Pga Mode, Internal Gain Setting (X2/X4/X8/X16/X32/X64); Inverting Input Not Used - ST STM32G4 Series Reference Manual

Advanced arm-based 32-bit mcus

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Programmable gain amplifier mode

The procedure to use the OPAMP as programmable gain amplifier is presented hereafter.

configure VM_SEL bits as "Feedback resistor is connected to OPAMPx_VINM input",

configure PGA_GAIN bits as "internal Gain 2, 4, 8, 16,32, or 64", 00000 to 00101

configure VP_SEL bits as "GPIO connected to OPAMPx_VINP", 00

As soon as the OPAEN bit is set, the voltage on pin OPAMPx_VINP is amplified by the

selected gain and visible on pin OPAMPx_VOUT.

To avoid saturation, the input voltage should stay below V

VINP3 or DACx_CHy

1. opamp_out can be redirected internally to an ADC channel by setting OPAINTOEN bit.

In this case, the I/O on which is mapped the OPAMPx_VOUT is free and can be used for another purpose.

Figure 170. PGA mode, internal gain setting (x2/x4/x8/x16/x32/x64),

RM0440 Rev 1

Operational amplifiers (OPAMP)

divided by the selected gain.

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