SBOU024C august 2004 – july 2023 PGA309
A dedicated circuit with a 7-bit + sign DAC for sensor voltage excitation and linearization is provided on the PGA309. This block scales the reference voltage and sums it with a portion of the PGA309 output to compensate the positive or negative bow-shaped nonlinearity exhibited by many sensors over their applied pressure range. Sensors not requiring linearization can be connected directly to the supply (VSA) or to the VEXC pin with the Linearization DAC (Lin DAC) set to zero.