SBAS640A January 2018 – June 2020 DRV5055
UNLESS OTHERWISE NOTED, this document contains PRODUCTION DATA.
The DRV5055 has a ratiometric analog architecture that scales the quiescent voltage and sensitivity linearly with the power-supply voltage. For example, the quiescent voltage and sensitivity are 5% higher when VCC = 5.25 V compared to VCC = 5 V. This behavior enables external ADCs to digitize a consistent value regardless of the power-supply voltage tolerance, when the ADC uses VCC as its reference.
Equation 3 calculates the sensitivity ratiometry error:
Equation 4 calculates quiescent voltage ratiometry error: