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AD9689-2000EBZ Datasheet(PDF) 48 Page - Analog Devices

Part # AD9689-2000EBZ
Description  Dual Analog-to-Digital Converter
PDF  134 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD9689-2000EBZ Datasheet(HTML) 48 Page - Analog Devices

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AD9689
Data Sheet
Rev. A | Page 48 of 134
NCO FREQUENCY TUNING WORD (FTW) SELECTION
48-BIT NCO FTW = MIXING FREQUENCY/ADC SAMPLE RATE × 248
QUADRATURE ANALOG MIXER +
2 ADCs + QUADRATURE DIGITAL
MIXER + NCO
COMPLEX INPUT—SAMPLED AT
fS
–
fS/32
fS/32
DC
BANDWIDTH OF
INTEREST
POSITIVE FTW VALUES
IMAGE DUE TO
ANALOG I/Q
MISMATCH
REAL
I
Q
QUADRATURE MIXER
I
Q
I
–
+
Q
Q
I
Q
+
+
Q
I
I
COMPLEX
I
Q
ADC
SAMPLING
AT
fS
ADC
SAMPLING
AT
fS
90°
PHASE
48-BIT
NCO
90°
0°
48-BIT NCO FTW =
ROUND ((
fS/3)/fS × 248) = +9.382513
(0x5555_5555_5555)
–
fS/2
–
fS/3
–
fS/4
–
fS/8
fS/16
fS/8
fS/4
fS/3
fS/2
–
fS/16
–
fS/32
fS/32
DC
Figure 112. DDC NCO Frequency Tuning Word Selection—Complex Inputs



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