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AMagk.1
AMagk.1
Associate
November 16, 2022
Question

Maximum frequency of DAC's external trigger

  • November 16, 2022
  • 1 reply
  • 853 views

Hello, my NUCLEO-H723ZG is running at 550 MHz and using maximum 137.5 MHz TIM for DAC triggering but I want triggering faster than this so, can I use external clk with frequency more than 137.5 MHz?

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1 reply

Michal Dudka
Michal Dudka
Lead
November 16, 2022

Maximum DAC sample rate is abour 51.1Msps (limited by data transfer from memory to DAC).

https://www.st.com/resource/en/application_note/an4566-extending-the-dac-performance-of-stm32-microcontrollers-stmicroelectronics.pdf

Faster triggering is meaningless (why to trigger DAC conversions with the same value ?).

Another topic is limited slewrate and bandwidth of embedded DAC output buffer (if you are using it).

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