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AS7058 数据表(PDF) 53 Page - ams-OSRAM AG |
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AS7058 数据表(HTML) 53 Page - ams-OSRAM AG |
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53 / 199 page  AS7058 Functional description Datasheet • PUBLIC • Document Feedback DS001077 • v2-00 • 2025-Sep-24 53 / 199 / Figure 45: ECG/BioZ signal processing overview 7.8 IIR filter An IIR filter with the parameters shown below in Table 11 is used to realize the notch filter functionality. It is possible to implement other filters by reprogramming the filter coefficients and using two’s complement for math operations. The clock frequency should be 10 MHz. Table 11: IIR filter parameters IIR filter parameter Value MAX_NUM_OF_SOS 12 SAMPLE_BIT_WIDTH 21 COEFF_BIT_WIDTH 16 SCALE_SHIFT 14 RAM_WIDTH 8 MOD 3 SINC Filter 4th/5th Order Decimation Rates: 16; 32; 64; 128; 256 Oversampling Filter Scaling 21 bit signed -> 20 bit unsigned 21 bit IIR Filters 12 Filter bocks 20 bit FIFO I2C Data transfer to host |
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