AN3023

ADC hardware description

Doc ID 16113 Rev 1

5/23

1.2

ADC operation

The analog-to-digital converter supports two basic conversion modes: single mode and

continuous mode.

Figure 2 and Figure 3 describe single and continuous mode analog-to-digital converter

operation.

In single conversion mode, the analog-to-digital converter performs only one conversion on

the selected channel.

Figure 2.

Single conversion mode

In continuous conversion mode, the analog-to-digital converter starts another conversion as

soon as the previous one is concluded.

Figure 3.

Continuous conversion mode

As shown in these figures, after ADC power on, the analog-to-digital converter needs a

accurately. For subsequent conversions there is no stabilization delay and ADON needs to

be set only once.

conversion time (14 clocks)

1 sync clock

3 clocks sampling time

10 clocks conversion

Power-on ADC

ADON=1

CLK

ADON

EOC

Start conversion

ADON=1 or trigger

End of conversion

Software reads

ADC data

Software clears

EOC bit

Start conversion

ADON=1 or trigger

ADC inactive

next conversion

conversion time (14 clocks)

Power-on ADC

ADON=1

CLK

ADON

EOC

Start conversion

ADON=1 or trigger

End of conversion

Software clears

EOC bit

Next conversion

starts immediately

next conversion time (14 clocks)

Software reads

ADC data