ST7MC1K2-Auto datasheet(351/371 Pages) STMICROELECTRONICS

351 / 371 page

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Electrical characteristics

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Figure 162. ADC accuracy characteristics

ADC accuracy vs. Negative injection current:

For IINJ- = 0.8mA, the typical leakage induced inside the die is 1.6µA and the effect on the ADC accuracy is a loss of 4 LSB

for each 10K

Ω increase of the external analog source impedance. This effect on the ADC accuracy has been observed

under worst-case conditions for injection:

- negative injection

- injection to an input with analog capability, adjacent to the enabled analog input

- at 5V VDD supply, and worst case temperature.

Data based on characterization results with TA =25°C.

Data based on characterization results over the whole temperature range, monitored in production.

1LSBIDEAL

1LSB

IDEAL

DDA

SSA

–

1024

-----------------------------------------

Vin (LSBIDEAL)

(1) Example of an actual transfer curve

(2) The ideal transfer curve

(3) End point correlation line

ET = Total unadjusted error: maximum deviation

between the actual and the ideal transfer curves.

EO = Offset error: deviation between the first actual

transition and the first ideal one.

EG = Gain error: deviation between the last ideal

transition and the last actual one.

ED = Differential linearity error: maximum deviation

between actual steps and the ideal one.

EL = Integral linearity error: maximum deviation

between any actual transition and the end point

correlation line.

Digital result ADCDR

1023

1022

1021

234567

1021 1022 1023 1024

(1)

(2)

(3)

VAREF

VSSA

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