STM8AF5269 datasheet(85/125 Pages) STMICROELECTRONICS

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STM8AF526x/8x/Ax STM8AF6269/8x/Ax

Electrical characteristics

114

10.3.11

10-bit ADC characteristics

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

specified.

Figure 43. Typical application with ADC

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

Table 43. 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)

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

tS(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

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