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YChu.7
YChu.7
Visitor II
December 10, 2018
Question

If there are 2x internal DACs in the STM32F407XX MCUs, why does the STM32F407VG Discovery Board need an external DAC for audio applications?

  • December 10, 2018
  • 2 replies
  • 879 views

I'm very new to the STM32, so sorry if this sounds stupid. As far as I could understand looking at the datasheets, the STM32F407XX has 2 DACs, but when embedded in the discovery board an external DAC (CS43L22) is used. Why is that?

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2 replies

Uwe Bonnes
Uwe Bonnes
Chief
December 10, 2018

The internal DAC is noisier, but probably has better DC accuracy.

AvaTar
AvaTar
Senior III
December 10, 2018

The CS43L22 DAC has higher resolution + less noise, and the chip adds headphone/speaker amplifiers.

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