STM8AF6186 datasheet(82/110 Pages) STMICROELECTRONICS

82 / 110 page

Electrical characteristics

STM8AF52/62xx, STM8AF51/61xx

82/110

Doc ID 14395 Rev 9

10.3.11

10-bit ADC characteristics

Subject to general operating conditions for VDDA, fMASTER and TA unless otherwise

specified.

Figure 42.

Typical application with ADC

Legend: RAIN = external resistance, CAIN = capacitors, Csamp = internal sample and hold capacitor.

Table 45.

ADC characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fADC

ADC clock frequency

—

111 kHz

—

4 MHz

kHz/MHz

VDDA

Analog supply

—

5.5

VREF+

Positive reference voltage

—

2.75

—

VDDA

VREF-

Negative reference voltage

—

VSSA

—0.5

VAIN

Conversion voltage range(1)

During the sample time, the sampling capacitance, Csamp (3 pF typ), can be charged/discharged by the

external source. The internal resistance of the analog source must allow the capacitance to reach its final

voltage level within tS. After the end of the sample time tS, changes of the analog input voltage have no

effect on the conversion result.

—VSSA

—VDDA

Devices with

external VREF+/

VREF- pins

VREF-

—VREF+

Csamp

Internal sample and hold capacitor

—

(1)

Sampling time

(3 x 1/fADC)

fADC = 2 MHz

—

1.5

—

µs

fADC = 4 MHz

—

0.75

—

tSTAB

Wakeup time from standby

fADC = 2 MHz

—

fADC = 4 MHz

3.5

tCONV

Total conversion time including

sampling time

(14 x 1/fADC)

fADC = 2 MHz

—

fADC = 4 MHz

—

3.5

—

Rswitch Equivalent switch resistance

—

AINx

STM8A

VDD

0.6V

VAIN

RAIN

10-bit A/D

conversion

CAIN

Csamp

Rswitch

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