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MAX5855 Datasheet(PDF) 39 Page - Maxim Integrated Products

Part No. MAX5855
Description  16-Bit, 4.9Gsps Wideband Interpolating and Modulating RF DAC with JESD204B Interface
Download  128 Pages
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX5855 Datasheet(HTML) 39 Page - Maxim Integrated Products

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Using equations (3) and (4):
FCW = int
(100390080.00000) = 1001390080
NFW
DFW = rem
(1001390080.00000) = 0.00000
NFW = 0,
DFW = 0
QUADRATURE
NCO
Figure 22. Complex NCO and Modulator
PHASE ACCUMULATOR
NFW
> DFW
-DFW
REG
DFW
REG
+1
TRUNCATE
SIN/COS MAPPING
FUNCTION
SIN
COS
FCW
Figure 23. NCO Block Diagram
The following is example Matlab code for calculating NCO values. When calculating FCW, NFW, and DFW, use long
format types for more precise results.
% Find out MAX5855 NCO values
format long
% Define DAC clock frequency
FDAC = 4915.2e6 x M
MAX5855
16-Bit, 4.9Gsps Wideband Interpolating
and Modulating RF DAC with JESD204B Interface
www.maximintegrated.com
Maxim Integrated | 39


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