ST7L09 datasheet(91/104 Pages) STMICROELECTRONICS

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ST7L05, ST7L09

91/104

ADC CHARACTERISTICS (Cont’d)

13.11 8-BIT ADC CHARACTERISTICS

Subject to general operating conditions for VDD, fOSC and TA (-40 to +105°C), unless otherwise specified.

Notes:

1. Unless otherwise specified, typical data is based on TA = 25°C and VDD -VSS = 5V. They are given only as design

guidelines and are not tested.

2. Data based on characterization results, not tested in production.

3. 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.

4. The stabilization time of the AD converter is masked by the first tLOAD. The first conversion after the enable is then

always valid.

Figure 68. Typical Application with ADC

Symbol

Parameter

Conditions

Min2) Typ1) Max2)

Unit

fADC

ADC clock frequency

MHz

VAIN

Conversion voltage range

VSS

VDD

RAIN

External input resistor

103)

Ω

CADC

Internal sample and hold capacitor

VDD = 5V

tSTAB

Stabilization time after ADC enable

fCPU = 8 MHz, fADC = 4 MHz

04)

µs

tCONV

Conversion time (tSAMPLE +tHOLD)3

tSAMPLE

Sample capacitor loading time

1/fADC

tHOLD

Hold conversion time

AINx

ST7XX

VDD

±1µA

0.6V

CADC

3pF

VAIN

RAIN

8-bit A/D

Conversion

Ω(max)

CAIN

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