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AD9083BBCZ Datasheet(PDF) 44 Page - Analog Devices |
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AD9083BBCZ Datasheet(HTML) 44 Page - Analog Devices |
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44 / 93 page  AD9083 Data Sheet Rev. 0 | Page 44 of 93 fC Calculation from FTW The actual fC from the example above can be calculated as follows: 7 _ _ 2 IN C NCO FTW f Actual f × = For the example listed above, the actual tuning frequency is 7 2 GHz 26 4 _ 101.5625 MHz 2 × = = C Actual f The example in this section shows that, even though the requested frequency is 100 MHz, the actual tuning frequency is about 1.5% off the actual value. It is important that the system designer be aware of this phenomenon and adjust the frequency plan of the logic device. One way to increase this resolution is to increase the CIC decimation ratio. In the previous example, if the CIC decimation ratio is increased to 8 (instead of 4), the NCO_FTW results in a value of 51, which calculates to 99.6094 MHz. This frequency only varies from the actual requested frequency of 100 MHz by ~0.4%. However, choosing this frequency plan results in an increased CIC filter droop, as shown in Figure 78. Therefore, care must be taken to choose the appropriate ADC sample rates, CIC decimation ratio, and the NCO frequency tuning word. |
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