STM32L4 sigma delta数字滤波器模块(DFSDM

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数字信号处理

  External Σ∆ modulators on market: – This is external standalone device: ADC converter on sigma delta principle – Analog input (usually differential) and digital output • Precision: ~16-bit resolution – Provides digital output as fast 1-bit data stream =》 serial interface • Up to 20MHz speed of serial data – Wide range of suppliers (ST, TI, Analog Devices) • STM32 interface: DFSDM = Digital Filter for Sigma Delta Modulators Implements complete post-processing from external Σ∆ modulators outputs: • Receiving of data streams from Σ∆ modulators (in various serial data formats) • Digital filtering of data stream (final 24-bit result) • Security/emergency functions Finally acts as internal ADC with external analog front end part

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