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AD9873 View Datasheet(PDF) - Analog Devices

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AD9873 Datasheet PDF : 39 Pages
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AD9873
THEORY OF OPERATION
To gain a general understanding of the AD9873 it is helpful
to refer to Figure 1, which displays a block diagram of the device
architecture. The following is a general description of the device
functionality. Later sections will detail each of the data path build-
ing blocks.
Tx IQ
Tx SYNC
MCLK
REF CLK
Rx IQ
DATA
ASSEMBLER
6
I
HALF-BAND HALF-BAND
FILTER #1
FILTER #2
12
12
12
Q
(fMCLK)
12
12
12
(fIQCLK)
،2
،2
R = 2,3,.......,63
،R
CIC
FILTER
QUADRATURE
MODULATOR
AD9873
COS
INV SINC
BYPASS
INV
SINC
12
MUX
DAC
SIN
DDS
(fSYSCLK)
(fOSCIN)
N = 3,4
،N
OSC IN
MULTIPLIER
؋M
M = 1,2,.......,31
3
AD832x CTRL
2
BURST PROFILE
CTRL
4
SERIAL
INTERFACE
4
MUX
CONTROL WORD 0 12
-
،8
CONTROL WORD 1 12
-
،2
(fOSCIN)
،2
8
ADC
8
ADC
REF-8
FSADJ
Tx
XTAL
OSC IN
SDELTA0
SDELTA1
I INPUT
Q INPUT
Rx SYNC
Rx - ITF
Rx IF
12
،2
(fOSCIN)
MUX
CLAMP LEVEL
10
ADC
REF-10
12
ADC
MUX
DAC
REF-12
IF10 INPUT
IF12 INPUT
VIDEO INPUT
Figure 1. Block Diagram
–20–
REV. 0
 

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