ST7263B datasheet(120/132 Pages) STMICROELECTRONICS

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ST7263B

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8-BIT ADC CHARACTERISTICS (Cont’d)

ADC Accuracy with VDD=5V, fCPU=8 MHz, fADC=4 MHz RAIN< 10kΩ

Figure 79. 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 1 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

Min

Max

|ET|

Total unadjusted error 1)

Offset error 1)

-0.5

Gain Error 1)

-1.5

|ED|

Differential linearity error 1)

1.5

|EL|

Integral linearity error 1)

1.5

1LSBIDEAL

1LSB

IDE AL

DDA

SSA

–

256

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

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

255

254

253

123

456

253 254 255 256

(1)

(2)

(3)

VDDA

VSSA

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