With the RSS error of the voltage reference, the ADC error needs also needs to be calculated using the RSS

method as seen in Equation 6. Equation 7 can then be used to sum both errors. It is important to make sure that

only the applicable voltage reference error in relation to the measured signal is used.

ADC Total

2

2

2

2

Total Unadjusted Error

Error

Gain Error

Offset Error

INL Error

DNL Error

(6)

2

2

VREF ADC Total

VREF@ AIN Total

ADC Total

Error

Error

Error

(7)

11.2.2.4 Enable Feature in ADAS

In ADAS applications it is important to have a low quiescent current when the automotive application does not

require the ADAS system to be in use. This creates a need for a low standby power so the battery life is

preserved but there is also need for the system to still be readily available to start-up with minimal delays. In

such situations the MCU and other systems will go into a standby mode to ensure that the power consumption is

lowered to the absolute minimum. The REF3425-Q1 offers an enable pin that can be controlled by the MCU to

activate shutdown mode with causes the REF3425-Q1 to go into stand by and consume 3 μA (maximum) and

allow for a longer battery life.

REF34-Q1

SBAS901C – JULY 2018 – REVISED OCTOBER 2020

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