STM32F398VE datasheet(21/151 Pages) STMICROELECTRONICS

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STM32F398VE

Functional overview

3.15

Digital-to-analog converter (DAC)

Two 12-bit buffered DAC channel can be used to convert digital signals into analog voltage

signal outputs. The chosen design structure is composed of integrated resistor strings and

an amplifier in inverting configuration.

This digital interface supports the following features:



Two DAC output channel



8-bit or 10-bit monotonic output



Left or right data alignment in 12-bit mode



Synchronized update capability



Noise-wave generation



Triangular-wave generation



Dual DAC channel independent or simultaneous conversions



DMA capability (for each channel)



External triggers for conversion



Input voltage reference VREF+

3.16

Operational amplifier (OPAMP)

The STM32F398VE embeds four operational amplifiers with external or internal follower

routing and PGA capability (or even amplifier and filter capability with external components).

When an operational amplifier is selected, an external ADC channel is used to enable

output measurement.

The operational amplifier features:



8.2 MHz bandwidth



0.5 mA output capability



Rail-to-rail input/output



In PGA mode, the gain can be programmed to be 2, 4, 8 or 16.

3.17

Ultra-fast comparators (COMP)

The STM32F398VE embeds seven ultra-fast rail-to-rail comparators with programmable

reference voltage (internal or external) and selectable output polarity.

The reference voltage can be one of the following:



External I/O



DAC output pin



Internal reference voltage or submultiple (1/4, 1/2, 3/4). Refer to Table 20: Embedded

internal reference voltage

for the value and precision of the internal reference voltage.

All comparators can wake up from STOP mode, generate interrupts and breaks for the

timers. and can be also combined per pair into a window comparator.

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