STM8AF6268 datasheet(69/89 Pages) STMICROELECTRONICS

69 / 89 page

STM8AF61xx, STM8AF62xx

Electrical characteristics

Doc ID 14952 Rev 6

69/89

10.3.11

10-bit ADC characteristics

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

specified.

Figure 40.

Typical application with ADC

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

Table 42.

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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