ST72361 datasheet(205/224 Pages) STMICROELECTRONICS

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ST72361

205/224

ADC CHARACTERISTICS (Cont’d)

Figure 119. RAIN Max vs fADC with CAIN = 0pF

1)2)

Figure 120. Recommended CAIN/RAIN Values

Figure 121. Typical Application with ADC

Notes:

1. 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.

2. 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.

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

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

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

ST72361 Datasheet(PDF) 205 Page - STMicroelectronics

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