AD9083BBCZ datasheet(44/93 Pages) AD

tên linh kiện	AD9083BBCZ

Giải thích chi tiết về linh kiện	16-Channel, 125 MHz Bandwidth, JESD204B Analog-to-Digital Converter

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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:

NCO FTW f

Actual f

For the example listed above, the actual tuning frequency is

2 GHz

101.5625 MHz



× 



Actual

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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