ST7LITE20F2 datasheet(144/166 Pages) STMICROELECTRONICS

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Electrical characteristics

ST7LITE20F2 ST7LITE25F2 ST7LITE29F2

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Doc ID 8349 Rev 5

Figure 89. Typical Application with ADC

The stabilization time of the AD converter is masked by the first tLOAD. The first conversion after the enable

is then always valid.

Table 85.

ADC Accuracy with VDD=5.0V

Symbol

Parameter

Conditions

Typ

Max(1)

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

Unit

|ET|

Total unadjusted error(2)

Injecting negative current on any of the analog input pins significantly reduces the accuracy of any

conversion being performed on any analog input.

Analog pins can be protected against negative injection by adding a Schottky diode (pin to ground).

Injecting negative current on digital input pins degrades ADC accuracy especially if performed on a pin

close to the analog input pins.

Any positive injection current within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in Section 13.8: I/O port

pin characteristics does not affect the ADC accuracy.

fCPU=8MHz, fADC=4MHz

(1), VDD=5.0V

LSB

|EO|

Offset error (2)

1.5

|EG|

Gain Error (2)

24.5

|ED|

Differential linearity

error(2)

2.5

4.5

|EL|

Integral linearity error(2)

2.5

4.5

AINx

ST72XXX

VDD

±1

μA

0.6V

CADC

6pF

VAIN

RAIN

10-Bit A/D

Conversion

CAIN

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