ST72325S6B5(2007) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST72325S6B5
(Rev.:2007)

8-bit MCU with 16 to 60K Flash/ROM, ADC, CSS, 5 timers, SPI, SCI, I2C interface

STMicroelectronics 

ADC CHARACTERISTICS (Cont’d)

Figure 95. RAIN max. vs fADC with CAIN=0pF1)

45

40

35

2 MHz

30

1 MHz

25

20

15

10

5

0

0

10

30

70

CPARASITIC (pF)

Figure 97. Typical A/D Converter Application

VAIN

RAIN

AINx

CAIN

Figure

96.

Recommended

CAIN

&

RAIN

2)

values.

1000

Cain 10 nF

100

Cain 22 nF

Cain 47 nF

10

1

0.1

0.01

0.1

1

10

fAIN(KHz)

VDD

VT

0.6V

VT

0.6V

ST72XXX

2kΩ(max)

10-Bit A/D

Conversion

IL

±1µA

CADC

12pF

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. 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).

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