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STM32L471RG 数据表(PDF) 41 Page - STMicroelectronics |
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STM32L471RG 数据表(HTML) 41 Page - STMicroelectronics |
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41 / 218 page  DocID027226 Rev 1 41/218 STM32L471xx Functional overview 55 3.21 Digital filter for Sigma-Delta Modulators (DFSDM) The device embeds one DFSDM with 4 digital filters modules and 8 external input serial channels (transceivers) or alternately 8 internal parallel inputs support. The DFSDM peripheral is dedicated to interface the external Σ∆ modulators to microcontroller and then to perform digital filtering of the received data streams (which represent analog value on Σ∆ modulators inputs). DFSDM can also interface PDM (Pulse Density Modulation) microphones and perform PDM to PCM conversion and filtering in hardware. DFSDM features optional parallel data stream inputs from microcontrollers memory (through DMA/CPU transfers into DFSDM). DFSDM transceivers support several serial interface formats (to support various Σ∆ modulators). DFSDM digital filter modules perform digital processing according user selected filter parameters with up to 24-bit final ADC resolution. |
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