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AD9545 Datasheet(PDF) 122 Page - Analog Devices |
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AD9545 Datasheet(HTML) 122 Page - Analog Devices |
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122 / 157 page  AD9545 Data Sheet Rev. A | Page 122 of 157 For example, given fS = 2.4 GHz, S = 6, and E = 2, then Pulse Width = (96/fS) × (1 + S × 2(E + 5)) = (96/(2.4 × 109)) × (1 + 6 × 2(2 + 5)) = (96/(2.4 × 109)) × (1 + 6 × 27) = 30.76 µs The user must ensure the programmed pulse width is less than the fundamental period of the auxiliary NCO. For this example, 30.76 µs is the maximum allowable fundamental period. Therefore, the corresponding fundamental frequency (fNCO_MAX) must satisfy fNCO_MAX < 1/(Pulse Width) < 1/(30.76 µs) < 32.51 kHz The key point is that the output frequency of the auxiliary NCO and the pulse width of its physical output signal are independently programmable parameters. The user can route the output pulse signal to any one of the Mx pins by defining the desired Mx pin as an output and selecting the desired auxiliary NCO as the output source (see the Status and Control Pins section). Although the user has the option of generating pulses on tagged time stamps (see the Tagged Auxiliary NCO Time Stamps section), the maximum pulse duration is the fundamental period of the auxiliary NCO. |
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