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AD6654/PCB 数据表(PDF) 41 Page - Analog Devices |
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AD6654/PCB 数据表(HTML) 41 Page - Analog Devices |
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41 / 88 page  AD6654 Rev. 0 | Page 41 of 88 INTERMEDIATE DATA ROUTER Following the FIR-HB cascade filters is the intermediate data router. This data router consists of muxes that allow the I and Q data from any channel front end (input port + NCO + CIC + FIRHB) to be processed by any channel back end (MRCF + DRCF + CRCF). The choice of channel front end is made by programming a 3-bit MRCF data select word in the MRCF control register. The valid values for this word and their corresponding settings are listed in Table 19. Table 19. Data Router Select Settings MRCF Data Select[2:0] Data Source 000 Channel 0 001 Channel 1 010 Channel 2 011 Channel 3 1x0 Channel 4 1x1 Channel 5 Allowing different channel back ends to select different channel front ends is useful in the polyphase implementation of filters. When multiple AD6654 channels are used to process a single carrier, a single-channel front end feeds more than one channel back end. After processing through the channel back ends (RCF filters), the data is interleaved back from all the polyphased channels. |
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