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ADS5294IPFPR 数据表(PDF) 55 Page - Texas Instruments |
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ADS5294IPFPR 数据表(HTML) 55 Page - Texas Instruments |
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55 / 81 page  k k 2 y(n) = [x(n) x(n 1)+y(n 1)] 2 +1 - - - ADS5294 www.ti.com SLAS776D – NOVEMBER 2011 – REVISED SEPTEMBER 2015 Table 17. Digital Filters DATA_RAT FILTERn_RA FILTERn_CO USE_FILTE EN_CUSTOM_ DECIMATION TYPE OF FILTER ODD_TAP E> TE EFF_SET R_CHn FILT Built-in low-pass odd-tap filter (pass band = 0 to fS/4) 01 000 000 1 1 0 Decimate by 2 Built-in highpass odd-tap filter (pass band = fS/4 to fS/2 ) 01 000 001 1 1 0 Built-in lowpass even-tap filter (pass band = 0 to fS/8) 10 001 010 0 1 0 Built-in first bandpass even tap filter(pass band = fS/8 to fS/4) 10 001 011 0 1 0 Decimate by 4 Built-in second bandpass even tap filter(pass band = fS/4 to 3 10 001 100 0 1 0 fS/8) Built-in highpass odd tap filter (pass band = 3 fS/8 to fS/2) 10 001 101 1 1 0 Decimate by 2 Custom filter (user-programmable coefficients) 01 000 000 0 and 1 1 1 Decimate by 4 Custom filter (user-programmable coefficients) 10 001 000 0 and 1 1 1 Decimate by 8 Custom filter (user-programmable coefficients) 11 100 000 0 and 1 1 1 Bypass decimation Custom filter (user-programmable coefficients) 0 and 1 1 1 Note: EN_CUSTOM_FILT is the D15 of register 5A (Hex) to B9 (Hex). The choice of the odd or even tap setting, filter coefficient set, and the filter rate uniquely determines the filter to be used. In addition to the preset filter coefficients, the coefficients for each of the eight filter channels can be programmed by the user. Each of the eight channels has 12 programmable coefficients, each 12-bit long. The 96 registers with addresses from 5A (Hex) to B9 (Hex) are used to program these eight sets of 12 programmable coefficients. Registers 5A to 65 are used to program the first filter, with the first coefficient occupying the bits D11..D0 of register 5A, the second coefficient occupying the bits D11..D0 of register 5B, and so on. Similarly registers 66 (Hex) to 71 (Hex) are used to program the second filter, and so on. When programming the filter coefficients, the D15 bit, EN_CUSTOM_FILT, of each of the 12 registers corresponding to that filter should be set to ‘1’. If the D15 bit of these 12 registers is set to ‘0’, then the preset coefficient (as programmed by FILTERn_COEFF_SET<2:0>) is used even if the bits D11..D0 get programmed. By setting or not setting the D15 bits of individual filter channels to ‘1’, some filters can be made to operate with preset coefficient sets, and some others can be made to simultaneously operate with programmed coefficient sets. 9.6.1.10 Highpass Filter Table 18. Highpass Filter ADDR. D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 NAME (HEX) 2E X X X X HPF_corner_CH1 2E X HPF_EN_CH1 2F X X X X HPF_corner_CH2 2F X HPF_EN_CH2 30 X X X X HPF_corner_CH3 30 X HPF_EN_CH3 31 X X X X HPF_corner_CH4 31 X HPF_EN_CH4 32 X X X X HPF_corner_CH5 32 X HPF_EN_CH5 33 X X X X HPF_corner_CH6 33 X HPF_EN_CH6 34 X X X X HPF_corner_CH7 34 X HPF_EN_CH7 35 X X X X HPF_corner_CH8 35 X HPF_EN_CH8 This group of registers controls the characteristics of a digital highpass transfer function applied to the output data, using Equation 4: where Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback 55 Product Folder Links: ADS5294 |
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