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AD9121 Arkusz danych(PDF) 1 Page - Analog Devices

Numer części AD9121
Szczegółowy opis  TxDAC Digital-to-Analog Converter
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Strona internetowa  http://www.analog.com
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AD9121 Arkusz danych(HTML) 1 Page - Analog Devices

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Dual, 14-Bit, 1230 MSPS,
TxDAC+ Digital-to-Analog Converter
Data Sheet
AD9121
Rev. B
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor foranyinfringementsofpatentsorother
rights of third parties that may result from its use. Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks arethe propertyoftheir respectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2012 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
FEATURES
Flexible LVDS interface allows word or byte load
Single-carrier W-CDMA ACLR = 82 dBc at 122.88 MHz IF
Analog output: adjustable 8.7 mA to 31.7 mA,
RL = 25 Ω to 50 Ω
Integrated 2×/4×/8× interpolator/complexmodulatorallows
carrier placement anywhere in the DAC bandwidth
Gain, dc offset, and phase adjustment for sideband
suppression
Multiple chip synchronization interfaces
High performance, lownoise PLL clock multiplier
Digital inverse sinc filter
Lowpower: 1.5 W at 1.2 GSPS, 800 mW at 500 MSPS,
full operating conditions
72-lead, exposed paddle LFCSP
APPLICATIONS
Wireless infrastructure
W-CDMA, CDMA2000, TD-SCDMA, WiMAX, GSM, LTE
Digital high or low IF synthesis
Transmit diversity
Wideband communications: LMDS/MMDS, point-to-point
GENERAL DESCRIPTION
The AD9121 is a dual, 14-bit, high dynamic range digital-to-
analog converter (DAC) that provides a sample rate of 1230 MSPS,
permitting multicarrier generation up to the Nyquist frequency.
The AD9121 TxDAC+® includes features optimized for direct
conversion transmit applications, including complex digital mod-
ulation, and gain and offset compensation. The DAC outputs
are optimized to interface seamlessly with analog quadrature
modulators, such as the ADL537x F-MOD series from Analog
Devices, Inc. A 4-wire serial port interface provides for program-
ming/readback of many internal parameters. Full-scale output
current can be programmed over a range of 8.7 mA to 31.7 mA.
The AD9121 comes in a 72-lead LFCSP.
PRODUCT HIGHLIGHTS
1. Ultralow noise and intermodulation distortion (IMD)
enable high quality synthesis of wideband signals from
baseband to high intermediate frequencies (IF).
2. Proprietary DAC output switching technique enhances
dynamic performance.
3. Current outputs are easily configured for various single-
ended or differential circuit topologies.
4. Flexible LVDS digital interface allows the standard 28-wire
bus to be reduced to one-half of the width.
COMPANION PRODUCTS
IQ Modulators: ADL5370, ADL537x family
IQ Modulatorswith PLLand VCO: ADRF6701, ADRF670x family
Clock Drivers: AD9516, AD951x family
Voltage Regulator Design Tool: ADIsimPower
TYPICAL SIGNAL CHAIN
NOTES
1. AQM = ANALOG QUADRATURE MODULATOR.
COMPLEX BASEBAND
DC
COMPLEX IF
fIF
RF
LO – fIF
DIGITAL
BASEBAND
PROCESSOR
PA
I DAC
Q DAC
2
2
2/4
2/4
ANTIALIASING
FILTER
AQM
LO
SIN
COS
AD9121
Figure 1.


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