ST72325AR7-Auto datasheet(219/243 Pages) STMICROELECTRONICS

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Electrical characteristics

Doc ID 13770 Rev 3

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19.12

10-bit ADC characteristics

Subject to general operating conditions for VDD, fCPU, and TA unless otherwise specified.

Table 137.

10-bit ADC characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fADC

ADC clock frequency

0.4

MHz

VAREF

Analog reference voltage

0.7*VDD < VAREF < VDD

3.8

VDD

VAIN

Conversion voltage range(1)

VSSA

VAREF

Ilkg

Input leakage current for analog

input(2)

-40°C < TA < 85°C range

±250

Other TA ranges

±1

µA

RAIN

External input impedance

See

Figure 95

and

Figure 96



CAIN

External capacitor on analog input

fAIN

Variation frequency of analog input

signal

CADC

Internal sample and hold capacitor

tADC

Conversion time (Sample + Hold)

fCPU = 8 MHz, speed = 0,

fADC =2MHz

7.5

µs

tADC

No. of sample capacitor loading

cycles

1/fADC

No. of hold conversion cycles

Any added external serial resistor will downgrade the ADC accuracy (especially for resistance greater than 10k

). Data

based on characterization results, not tested in production.

Injecting negative current on adjacent pins may result in increased leakage currents. Software filtering of the converted

analog value is recommended.

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