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ADC12J1600 Datasheet(PDF) 39 Page - Texas Instruments |
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ADC12J1600 Datasheet(HTML) 39 Page - Texas Instruments |
39 / 98 page ![]() ADC12J1600, ADC12J2700 www.ti.com SLAS969C – JANUARY 2014 – REVISED JULY 2015 7.3.6.3 Decimation Filters The decimation filters are arranged to provide a programmable overall decimation of 4, 8, 10, 16, 20, or 32. The input and output of each filter is complex. The output data consists of 15-bit complex baseband information. Table 7 lists the effective output sample rates. Table 7. Output Sample Rates COMPLEX SAMPLE OUTPUT RATE AND RESULTING BANDWIDTH (OUTPUT SAMPLE = 15-BIT I + 15-BIT Q + 2-BIT OR) ƒ(DEVCLK) ƒ(DEVCLK) = 4000 MHz DECIMATION ALIAS ALIAS SETTING RAW OUTPUT RAW OUTPUT OUTPUT RATE PROTECTED OUTPUT RATE PROTECTED BANDWIDTH BANDWIDTH (MSPS) BANDWIDTH (MSPS) BANDWIDTH (MHz) (MHz) (MHz) (MHz) 4 ƒ(DEVCLK) / 4 ƒ(DEVCLK) / 4 0.8 × ƒ(DEVCLK) / 4 1000 1000 800 8 ƒ(DEVCLK) / 8 ƒ(DEVCLK)N / 8 0.8 × ƒ(DEVCLK) / 8 500 500 400 10 ƒ(DEVCLK) / 10 ƒ(DEVCLK) / 10 0.8 × ƒ(DEVCLK) / 10 400 400 320 16 ƒ(DEVCLK) / 16 ƒ(DEVCLK) / 16 0.8 × ƒ(DEVCLK) / 16 250 250 200 20 ƒ(DEVCLK) / 20 ƒ(DEVCLK) / 20 0.8 × ƒ(DEVCLK) / 20 200 200 160 32 ƒ(DEVCLK) / 32 ƒ(DEVCLK) / 32 0.8 × ƒ(DEVCLK) / 32 125 125 100 For maximum efficiency a group of high speed filter blocks are implemented with specific blocks used for each decimation setting. The first table below describes the combination of filter blocks used for each decimation setting. The next table lists the coefficient details and decimation factor of each filter block. Table 8. Decimation Mode Filter Usage Decimation Setting Filter Blocks Used 4 CS19, CS55 8 CS11, CS15, CS55 10 CS11, CS139 16 CS7, CS11, CS15, CS55 20 CS7, CS11, CS139 32 CS7, CS7, CS11, CS15, CS55 Copyright © 2014–2015, Texas Instruments Incorporated Submit Documentation Feedback 39 Product Folder Links: ADC12J1600 ADC12J2700 |
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