AD9859(RevB) View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

AD9859
(Rev.:RevB)

400 MSPS, 10-Bit, 1.8 V CMOS Direct Digital Synthesizer

Analog Devices 

Data Sheet

SUGGESTED APPLICATION CIRCUITS

RF/IF INPUT

MODULATED/

DEMODULATED

SIGNAL

AD9859

LPF

REFCLK

Figure 25. Synchronized LO for Up Conversion/Down Conversion

REF

SIGNAL

PHASE

COMPARATOR

LOOP

FILTER

FILTER

AD9859

VCO

TUNING

WORLD

Figure 26. Digitally Programmable Divide-by-N Function in PLL

AD9859

FREQUENCY PHASE

TUNING

OFFSET

WORD

WORD 1

I/I

BASEBAND

REFCLK

CRYSTAL

IOUT

AD9859 DDS IOUT

LPF

REFCLK

CRYSTAL OUT SYNC OUT

RF OUT

SYNC IN

AD9859 DDS IOUT

LPF

IOUT

REFCLK

FREQUENCY

TUNING

WORD

PHASE

OFFSET

WORD 2

Q/Q

BASEBAND

Figure 27. Two AD9859s Synchronized to Provide I and

Q Carriers with Independent Phase Offsets for Nulling

Rev. B | Page 23 of 24

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