AD9859 Analog Devices, Inc., AD9859 Datasheet - Page 23

• Manufacturer Part Number: AD9859
• Description: 400 Msps, 10-bit, 1.8 V Cmos Direct Digital Synthesizer
• Manufacturer: Analog Devices, Inc.

SUGGESTED APPLICATION CIRCUITS
SIGNAL
REFCLK
REF
Figure 25. Synchronized LO for Upconversion/Down Conversion
Figure 26. Digitally Programmable Divide-by-N Function in PLL
FILTER
COMPARATOR
AD9859
PHASE
AD9859
RF/IF INPUT
TUNING
WORLD
LPF
FILTER
LOOP
MODULATED/
DEMODULATED
SIGNAL
VCO
Rev. 0 | Page 23 of 24
CRYSTAL
SAW
Figure 27. Two AD9859s Synchronized to Provide I and
Q Carriers with Independent Phase Offsets for Nulling
REFCLK
REFCLK
CRYSTAL OUT
REFCLK
FREQUENCY
FREQUENCY
TUNING
WORD
TUNING
AD9859 DDS
AD9859 DDS
WORD
OFFSET
WORD 1
OFFSET
WORD 2
SYNC OUT
PHASE
PHASE
SYNC IN
IOUT
IOUT
IOUT
IOUT
LPF
LPF
BASEBAND
BASEBAND
Q/Q
I/I
AD9859
RF OUT