ST72321R7-Auto datasheet(216/243 Pages) STMICROELECTRONICS

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Electrical characteristics

ST72321xx-Auto

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Doc ID 13829 Rev 1

19.12

10-bit ADC characteristics

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

Table 135.

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

Positive input leakage current for

analog input

-40°C < TA < 85°C range

±250

Other TA ranges

±1

µA

Ilkg

Negative input leakage current on

robust analog pins(2)

VIN <VSS, | IIN |< 400µA

on adjacent robust analog

µA

RAIN

External input impedance(3)

See

Figure 97

and

Figure 98



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 any of the analog input pins significantly reduces the accuracy of any conversion being

performed on any analog input. Analog pins of Flash devices 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

I

INJ(PIN) in Section 19.8 does not affect the ADC accuracy.

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.

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