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MCP3909 датащи(PDF) 29 Page - Microchip Technology |
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MCP3909 датащи(HTML) 29 Page - Microchip Technology |
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29 / 44 page ![]() © 2009 Microchip Technology Inc. DS22025B-page 29 MCP3909 5.6 Filter Input Mode The filter input mode allows the user to feed the MCP3909 device an input to the LPF1. Data is received MSB first. The MCP3909 will treat this data as if it were the output of the multiplier and will LPF and D-F the result as normal, giving the resulting output frequency on HFOUT, FOUT0 and FOUT1. See Tables 4-2 and 4-3 for transfer functions of the output frequencies. When using filter input mode, the user must wait for the data ready flag (DR) to appear on SDO before attempting to clock in data to the device. The user can not access either the multiplier output or the dual channel output while in this mode. FIGURE 5-6: Filter Input Mode. D3 D2 D1 D0 Hi-z D16 D18 D17 1 23 17 18 19 20 X 20 X 20 4 D19 Hi-z DR F1 / SDI F2 / SCK NEG / SDO F0 / CS |
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