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ADC3683 Datasheet(PDF) 27 Page - Texas Instruments

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Part # ADC3683
Description  ADC3683-SP Space Grade 18-Bit 1 to 65MSPS, Low Noise, Ultra-low Power Dual Channel ADC
PDF  70 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

ADC3683 Datasheet(HTML) 27 Page - Texas Instruments

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For this example there are actually four ways to program the NCO and achieve the desired output frequency as
shown in Table 7-2.
Table 7-2. NCO Value Calculations Example
Alias or negative image
fNCO
NCO Value
Mixer Phase
Frequency translation for fOUT
fIN = –10MHz
fNCO = 10MHz
660764199
as is
fOUT = fIN + fNCO = –10MHz +10MHz = 0MHz
fIN = 10MHz
fNCO = –10MHz
3634203097
fOUT = fIN + fNCO = 10MHz + (–10MHz) = 0MHz
fIN = 10MHz
fNCO = 10MHz
660764199
inverted
fOUT = fIN – fNCO = 10MHz – 10MHz = 0MHz
fIN = –10MHz
fNCO = –10MHz
3634203097
fOUT = fIN – fNCO = –10MHz – (–10MHz) = 0MHz
www.ti.com
ADC3683-SP
SBASAB5 – MARCH 2024
Copyright © 2024 Texas Instruments Incorporated
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