RM0440 Rev 4 725/2126
RM0440 Digital-to-analog converter (DAC)
773
22 Digital-to-analog converter (DAC)
22.1 Introduction
The DAC module is a 12-bit, voltage output digital-to-analog converter. The DAC can be
configured in 8- or 12-bit mode and may be used in conjunction with the DMA controller. In
12-bit mode, the data could be left- or right-aligned. The DAC features up to two output
channels, each with its own converter. In dual DAC channel mode, conversions could be
done independently or simultaneously when both channels are grouped together for
synchronous update operations. An input reference pin, V
REF+
(shared with others analog
peripherals) is available for better resolution. An internal reference can also be set on the
same input. Refer to voltage reference buffer (VREFBUF) section.
The DAC_OUTx pin can be used as general purpose input/output (GPIO) when the DAC
output is disconnected from output pad and connected to on chip peripheral. The DAC
output buffer can be optionally enabled to allow a high drive output current. An individual
calibration can be applied on each DAC output channel. The DAC output channels support
a low power mode, the Sample and hold mode.
22.2 DAC main features
The DAC main features are the following (see Figure 156: Dual-channel DAC block
diagram)
• Up to four DAC interfaces, maximum two output channels each
• Left or right data alignment in 12-bit mode
• Synchronized update capability
• Noise-wave and Triangular-wave generation
• Sawtooth wave generation
• Dual DAC channel for independent or simultaneous conversions
• DMA capability for each channel including DMA underrun error detection
• Double data DMA capability to reduce the bus activity
• External triggers for conversion
• DAC output channel buffered/unbuffered modes
• Buffer offset calibration
• Each DAC output can be disconnected from the DAC_OUTx output pin
• DAC output connection to on chip peripherals
• Sample and hold mode for low power operation in Stop mode
• Input voltage reference,
V
REF+
Figure 156 shows the block diagram of a DAC channel and Table 180 gives the pin
description.
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