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AD9122 Arkusz danych(PDF) 1 Page - Analog Devices

Numer części AD9122
Szczegółowy opis  High Dynamic Range RF Transmitter Signal Chain Using Single External Frequency Reference for DAC Sample Clock and IQ Modulator LO Generation
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AD9122 Arkusz danych(HTML) 1 Page - Analog Devices

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Circuit Note
CN-0243
Circuits from the Lab™ reference circuits are
engineered and testedfor quickandeasy
system integrationtohelpsolvetoday’sanalog,
mixed-signal, and RF design challenges.
For more informationand/or support,visit
www.analog.com/CN0243.
Devices Connected/Referenced
ADRF6702
1200 MHz to 2400 MHz Quadrature
Modulator with1550 MHz to 2150 MHz
Fractional-N PLL and Integrated VCO
AD9122
Dual, 16-Bit, 1230 MSPS, TxDAC®
AD9516-0/AD9516-1/
AD9516-2/AD9516-3/
AD9516-4
Clock Generator with Integrated VCO
with Various Frequency Range Options
from 1.45 GHz to 2.95 GHz
High Dynamic Range RF Transmitter Signal Chain Using Single External Frequency
Reference for DAC Sample Clock and IQ Modulator LO Generation
Rev.0
CircuitsfromtheLab™circuitsfromAnalogDeviceshavebeendesignedandbuiltbyAnalogDevices
engineers. Standard engineering practices have been employed in the design and construction of
eachcircuit,andtheirfunctionandperformancehavebeentestedandverifiedinalabenvironmentat
room temperature. However, you are solely responsible for testing the circuit and determining its
suitabilityandapplicabilityforyouruseandapplication.Accordingly,innoeventshallAnalogDevices
be liable for direct, indirect, special, incidental, consequential or punitive damages due to any cause
whatsoeverconnectedtotheuseofanyCircuitsfromtheLabcircuits. (Continuedonlastpage)
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2011 Analog Devices, Inc. All rights reserved.
EVALUATION AND DESIGN SUPPORT
Circuit Evaluation Boards
CN-0243 Circuit Evaluation Board (EVAL-CN0243-EB1Z)
Design and Integration Files
Schematics, Layout Files, Bill of Materials
CIRCUIT FUNCTION AND BENEFITS
The combination of the ADRF6702 IQ modulator and the
AD9122 16-bit dual 1.2 GSPS TxDAC has the dynamic range
necessary for a modern high level QAM or OFDM based
wireless transmitter as shown in Figure 1. The dynamic range
EXTERNAL
FREQUENCY
REFERENCE
INPUT
DUAL MODULUS PLL
WITH ON CHIP VCO
EXTERNAL LOOP
FILTER
EXTERNAL LOOP
FILTER
AD9516
AD9122
ADRF6702
PLL REFERENCE
INPUT
PROGRAMMABLE DIVIDER
PROGRAMMABLE DIVIDER
OPTIONAL
EXTERNAL
2 × LO (I/O)
INTERNALLY
GENERATED
2 × LO
ADRF6702
RF OUTPUT
AD9122 DAC
SAMPLE CLOCK
IDAC
I CHANNEL PASSIVE INTERFACE FILTER
QDAC
Q CHANNEL PASSIVE INTERFACE FILTER
16-BIT
DATA BUS
(I)
16-BIT
DATA BUS
(Q)
32-BIT NCO
2×/4×/8×
INTERPOLATION
FILTERS
2×/4×/8×
INTERPOLATION
FILTERS
INTERNAL LO
SYNTHESIZER/PLL
INTERNAL
VCO
÷2
MODULATOR
CORE
PLL CORE (PFD, CHARGE
PUMP, DIVIDER)
Figure 1. AD9122, ADRF6702, and AD9516 Used in a High Dynamic Range Transmitter


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