Doc ID16895 Rev 2

13/24

AN3126

DAC main features

23

Figure 9. Triangular waveform with changeable offset

1.8.2

Typical applications

Triangular wave generators are often used in sound synthesis as its timbre is less harsh

than the square wave because the amplitude of its upper harmonics falls off more rapidly.

Triangular wave generator circuits are also used in many modem circuit applications.

1.9

Buffered output

To drive external loads without using an external operational amplifier, DAC channels have

embedded output buffers which can be enabled and disabled depending on the user

application.

When the DAC output is not buffered, and there is a load in the user application circuit, the

voltage output will be lower than the desired voltage. Enabling the buffer, the voltage output

and the voltage desired are similar.

Figure 10. Non buffered channel voltage (with and without load)

Triangular waveform

Pattern waveform (offset)

Result waveform

ai18308

ai18309

DAC

DAC_Channel_1

DOR = 0xFFF



DAC

DAC_Channel_1

DOR = 0xFFF



3.3V

R = 5.1K

GND

1.2 V

1.2 V

3.3 V

3.3 V

3.3 V