參數(shù)資料
型號: AD9852AST
廠商: ANALOG DEVICES INC
元件分類: XO, clock
英文描述: CMOS 300 MHz Complete-DDS
中文描述: PLL FREQUENCY SYNTHESIZER, 20 MHz, PQFP80
封裝: MS-026BEC, LQFP-80
文件頁數(shù): 12/42頁
文件大?。?/td> 424K
代理商: AD9852AST
AD9852
–12–
REV. 0
FREQUENCY – MHz
1200
0
A
1000
800
600
400
200
0
100
200
300
400
500
MINIMUM COMPARATOR
INPUT DRIVE
V
CM
= 0.5V
Figure 23. Comparator Toggle Voltage Requirement
I
Q
Rx
RF IN
DUAL
8-/10-BIT
ADC
DIGITAL
DEMODULATOR
Rx BASEBAND
DIGITAL DATA
OUT
8
8
I/Q MIXER
AND
LOW-PASS
FILTER
VCA
ADC ENCODE
ADC CLOCK FREQUENCY
LOCKED TO Tx CHIP/
SYMBOL/PN RATE
REFERENCE
CLOCK
48
CHIP/SYMBOL/PN
RATE DATA
AD9852
GENERATOR
Figure 25. Chip Rate Generator in Spread Spectrum Application
50
V
BANDPASS
FILTER
50
V
I
OUT
AD9852
FUNDAMENTAL
F
– F
O
IMAGE
F
CLK
F
+ F
O
IMAGE
BANDPASS
FILTER
F
+ F
O
IMAGE
AD9852
SPECTRUM
FINAL OUTPUT
SPECTRUM
Figure 26. Using an Aliased Image to Generate a High
Frequency
VCO
LOOP
FILTER
PHASE
COMPARATOR
REFERENCE
CLOCK
FILTER
AD9852
DDS
TUNING
WORD
REF CLK IN
RF
FREQUENCY
OUT
DAC OUT
Figure 27. Programmable “Divide-by-N” Synthesizer
LPF
REFCLK
RF/IF
INPUT
AD9852
BASEBAND
SIN
Figure 24. Synthesized L.O. Application for the AD9852
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