ST72F262G2B6 datasheet(157/172 Pages) STMICROELECTRONICS

157 / 172 page

ST72260Gx, ST72262Gx, ST72264Gx

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13.12 10-BIT ADC CHARACTERISTICS

VDD= 2.7 to 5.5V, TA = -40°C to 85°C, unless otherwise specified

Figure 97. RAIN max. vs fADC with CAIN=0pF

Figure 98. Recommended CAIN/RAIN values

Figure 99. Analog Input equivalent circuit

Notes:

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

Ω). Data

based on characterization results, not tested in production.

2. CPARASITIC represents the capacitance of the PCB (dependent on soldering and PCB layout quality) plus the pad ca-

pacitance (3pF). A high CPARASITIC value will downgrade conversion accuracy. To remedy this, fADC should be reduced.

3. This graph shows that depending on the input signal variation (fAIN), CAIN can be increased for stabilization time and

decreased to allow the use of a larger serial resistor (RAIN). It is valid for all fADC frequencies ≤ 4MHz.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fADC

ADC clock frequency

0.5

4MHz

VAIN

Conversion voltage range

VSS

VDD

CADC

Internal sample and hold capacitor

tCONV

Conversion time

FLASH, fADC=4MHz

µs

112

1/fADC

ROM, fADC=4MHz

3.5

µs

1/fADC

RAIN

External input impedance

see

Figure 97

and

Figure

981)2)3)

Ω

CAIN

External capacitor on analog input

fAIN

Variation frequency of analog input

signal

010

CPARASITIC (pF)

4 MHz

2 MHz

1 MHz

0.1

100

1000

0.01

0.1

fAIN(KHz)

Cain 10 nF

Cain 22 nF

Cain 47 nF

AINx

ST72XXX

VDD

±1

µA

0.6V

CADC

6pF

VAIN

RAIN

10-Bit A/D

Conversion

Ω(max)

CAIN

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