AD9854ASQ Analog Devices Inc, AD9854ASQ Datasheet - Page 17

• Manufacturer Part Number: AD9854ASQ
• Manufacturer: Analog Devices Inc

Specifications of AD9854ASQ

• Lead Free Status / RoHS Status: Not Compliant

DDS – LO
NOTES
1. FLIP DDS QUADRATURE SIGNALS TO SELECT ALTERNATE SIDEBAND. ADJUST DDS
CLOCK
Figure 32. Differential Output Connection for Reduction of Common-Mode Signals
SINE OR COSINE SIGNAL AMPLITUDE FOR GREATEST SIDEBAND SUPPRESSION.
DDS DAC OUTPUTS MUST BE LOW-PASS FILTERED PRIOR TO USE WITH THE AD8346.
REF
REFERENCE
CLOCK
REFERENCE
LO
CLOCK
REJECTION
Figure 29. Programmable Fractional Divide-by-N Synthesizer
AD9854
TUNING
DAC OUT
WORD
TYPICAL
DDS
FILTER
36dB
DDS
+ LO
SSB
Figure 30. Agile High Frequency Synthesizer
AD9854
Figure 31. Single Sideband Upconversion
DDS
V
50Ω
AD8346 QUADRATURE
FILTER
OUT
COMPARATOR
AD9854
TUNING
PHASE
WORD
MODULATOR
TRANSFORMER-COUPLED
DDS
Σ
Rev. D | Page 17 of 52
(MINICIRCUITS T1-1T)
I
I
OUT
OUT
1:1 TRANSFORMER
DIFFERENTIAL
SPLITTER
COMPARATOR
PHASE
DIVIDE-BY-N
OUTPUT
PHASE
50Ω
LO
LO
PROGRAMMABLE
DIVIDE-BY-N FUNCTION
(WHERE N = 2
REF CLK IN
90
0
FILTER
LOOP
COSINE (DC TO 70MHz)
SINE (DC TO 70MHz)
2.5GHz
0.8 TO
FILTER
FILTER
LOOP
48
/TUNING WORD)
VCO
FREQUENCY
QUADRATURE
AD9854
OUT
RF
VCO
50Ω
DDS
FREQUENCY
OUT
RF
AD9854