CST12.0MTWA datasheet(139/153 Pages) STMICROELECTRONICS

139 / 153 page

ST72334J/N, ST72314J/N, ST72124J

139/153

8-BIT ADC CHARACTERISTICS (Cont’d)

ADC Accuracy

Figure 99. 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.

Symbol

Parameter

VDD=5V,

fCPU=1MHz

VDD=5.0V,

fCPU=8MHz

VDD=3.3V,

fCPU=8MHz

Unit

Typ.

Max

Typ.

Max

Typ

Max

|ET|

Total unadjusted error 1)

2.0

LSB

Offset error 1)

1.5

Gain Error 1)

1.5

|ED|

Differential linearity error 1)

1.5

|EL|

Integral linearity error 1)

1.5

1LSBIDEAL

1LSB

IDEAL

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

1234

567

253 254 255 256

(1)

(2)

(3)

VDDA

VSSA

CST12.0MTWA Datasheet(PDF) 139 Page - STMicroelectronics

CST12.0MTWA Datasheet(HTML) 139 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Descarga

Enlace URL