ST7MC1K2TC datasheet(283/308 Pages) STMICROELECTRONICS

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10-BIT ADC CHARACTERISTICS (Cont’d)

ADC Accuracy with VDD=5.0V

Notes:

1. ADC Accuracy vs. Negative Injection Current: Injecting negative current may reduce the accuracy of the conversion

being performed on another analog input. The effect of negative injection current on analog pins is specified in Section

12.14.

Any positive injection current within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in Section 12.8 does not affect the ADC

accuracy.

2. Data based on characterization results, monitored in production to guarantee 99.73% within ± max value from -40°C

to 125°C (± 3

σ distribution limits).

Figure 161. ADC Accuracy Characteristics

Notes:

1. 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.

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

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

Symbol

Parameter

Conditions

Typ

Max 2)

Unit

|ET|

Total unadjusted error 1)

VAREF=3.0V to 5.0V, fCPU=8MHz,

fADC=4MHz, RAIN<10kΩ

LSB

|EO|Offset error

2.5

|EG|

Gain Error 1)

|ED|

Differential linearity error 1)

24.5

|EL|

Integral linearity error 1)

24.5

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

4567

1021 1022 1023 1024

(1)

(2)

(3)

VAREF

VSSA

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