ST7LITE05 datasheet(105/122 Pages) STMICROELECTRONICS

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ADC CHARACTERISTICS (Cont’d)

Figure 90. ADC Accuracy Characteristics with Amplifier enabled

Note: When the AMPSEL bit in the ADCDRL register is set, it is mandatory that fADC be less than or equal

to 2 MHz. (if fCPU=8MHz. then SPEED=0, SLOW=1).

Notes:

1) Data based on characterization results over the whole temperature range, not tested in production.

2) For precise conversion results it is recommended to calibrate the amplifier at the following two points:

– offset at VINmin = 0V

– gain at full scale (for example VIN=250mV)

3) Monotonicity guaranteed if VIN increases or decreases in steps of min. 5mV.

1LSBIDEAL

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.

n=Amplifier Offset

Digital Result ADCDR

n+5

n+4

n+3

n+2

n+1

n+7

n+6

12345

100 101 102 103

(1)

(2)

(3)

250 mV

VSS

1LSB

IDE AL

DDA

SSA

–

103

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

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VDD(AMP)

Amplifier operating voltage

4.5

5.5

VIN

Amplifier input voltage

VDD=5V

250

VOFFSET

Amplifier offset voltage

200

VSTEP

Step size for monotonicity3)

5mV

Linearity

Output Voltage Response

Linear

Gain factor

Amplified Analog input Gain2)

71)

891)

Vmax

Output Linearity Max Voltage

VINmax = 250mV,

VDD=5V

2.05

2.2

2.4

Vmin

Output Linearity Min Voltage

01)

0.22

0.25

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