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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AD7760BCP датащи(PDF) 19 Page - Analog Devices |
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AD7760BCP датащи(HTML) 19 Page - Analog Devices |
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19 / 22 page  Preliminary Technical Data AD7760 Rev. PrN | Page 19 of 22 Table 11 shows the Hex values (in sign and magnitude format) that are downloaded to the AD7760 to realize this filter. The table is also split into the bytes which are all summed to produce the checksum. The checksum generated from these coefficients is 0x0E6B. Table 11. Filter Hex Values Coeff Word 1 Word 2 Byte 1 Byte 2 Byte 3 Byte 4 1 03 2B 96 88 2 01 BF 18 3C 3 00 15 66 26 4 04 A8 1E 6A 5 04 5F 2A 96 6 00 2C 49 C2 7 00 50 E9 F6 8 00 10 DB D8 9 04 2F DE 54 10 04 37 44 5A 11 04 1B 7D 6E 12 04 04 3B 5F What follows is a list of 16-bit words that the user would write to the AD7760 to set up the ADC and download this filter assuming an output data rate of 1.25MHz has already been selected. 0x0001 Address of Control Register 1 0x8079 Control Reg Data; DL Filter, Set Filter Length = 24, Set Output Data Rate = 1.25MHz 0x032B First Coefficient, Word 1 0x9688 First Coefficient, Word 2 0x01BF Second Coefficient, Word 1 0x183C Second Coefficient, Word 2 … … 0x0404 Twelfth (Final) Coefficient, Word 1 0x3B5F Final Coefficient, Word 2 0x0E6B Checksum Wait TBD xS for AD7760 to fill remaining unused coefficients with zeros. 0x0001 Address of Control Register 0x0879 Control Reg Data; Set Read Status and maintain filter length and decimation settings. Read contents of Status Register. Check Bit 7 (DL_OK) to determine that the filter was downloaded correctly. |
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