Application examples

AN3126

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Doc ID16895 Rev 2

Note:

For right-aligned 12-bit resolution: DAC_MaxDigitalValue = 0xFFF

For right-aligned 8-bit resolution: DAC_MaxDigitalValue = 0xFF

()

3.3Volt

()

0xFFF 1

+

-------------------------------------

=

The table is saved in the memory and transferred by the DMA, the transfer is triggered by

the same timer that triggers the DAC

2.1.3

Fixing the sine wave frequency

To fix the frequency of the sinewave signal, you have to set the frequency of the Timer

Trigger output.

The frequency of the produced sine wave is

------------------------------

=

So, if TIMx_TRGO is 1 MHz, the frequency of the DAC sine wave is 10 kHz.

Note:

To have a high quality sine wave curve, it is recommended to use a high number of samples

Table 4. Digital and analog sample values of the sine wave

Sample

(x)

Digital Sample Value

Analog Sample Value (Volt)

0

2048

1.650

1

3251

2.620

2

3995

3.219

3

3996

3.220

4

3253

2.622

5

2051

1.653

6

847

0.682

7

101

0.081

8

98

0.079

9

839

0.676