ST72324 datasheet(142/163 Pages) STMICROELECTRONICS

142 / 163 page

ST72324

142/163

12.13 10-BIT ADC CHARACTERISTICS

Subject to general operating conditions for VDD, fCPU, and TA unless otherwise specified.

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.For Flash devices: injecting negative current on any of the analog input pins significantly reduces the accuracy of any

conversion being performed on any analog input. Analog pins of ST72F324 devices can be protected against negative

injection by adding a Schottky diode (pin to ground). Injecting negative current on digital input pins degrades ADC accu-

racy especially if performed on a pin close to the analog input pins. Any positive injection current within the limits specified

for IINJ(PIN) and ΣIINJ(PIN) in Section 12.9 does not affect the ADC accuracy.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fADC

ADC clock frequency

0.4

MHz

VAREF

Analog reference voltage

0.7*VDD ≤VAREF ≤VDD

3.8

VDD

VAIN

Conversion voltage range 1)

VSSA

VAREF

Ilkg

Positive input leakage current for analog

input2)

-40°C

≤T

A≤+85°C

±250

+85°C

≤T

A≤+125°C

±1

µA

RAIN

External input impedance

see

Figure 83

and

Figure

842)3)4)

Ω

CAIN

External capacitor on analog input

fAIN

Variation freq. of analog input signal

CADC

Internal sample and hold capacitor

tADC

Conversion time (Sample+Hold)

fCPU=8MHz, SPEED=0 fADC=2MHz

7.5

µs

tADC

- No of sample capacitor loading cycles

- No. of Hold conversion cycles

1/fADC

ST72324 데이터시트(PDF) 142 Page - STMicroelectronics

ST72324 데이터시트(HTML) 142 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

데이터시트 다운로드

링크 URL