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AD9122BCPZ Fiches technique(PDF) 1 Page - Analog Devices

No de pièce AD9122BCPZ
Description  Dual, 16-Bit, 1200 MSPS, TxDAC짰 Digital-to-Analog Converter
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

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Dual, 16-Bit, 1200 MSPS,
TxDAC+® Digital-to-Analog Converter
AD9122
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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
©2009 Analog Devices, Inc. All rights reserved.
FEATURES
Flexible LVDS interface allows word, byte, or nibble load
Single-carrier W-CDMA ACLR = 82 dBc @ 122.88 MHz IF
Analog output: adjustable 8.7 mA to 31.7 mA, RL = 25 Ω to 50 Ω
Novel 2×/4×/8× interpolator/complex modulator allows
carrier placement anywhere in the DAC bandwidth
Digital gain and phase adjustment for sideband suppression
Multiple chip synchronization interfaces
High performance, low noise PLL clock multiplier
Digital inverse sinc filter
Flexible LVDS interface allows word, byte, or nibble load
Low power: 1.5 W @ 1.2 GSPS, 800 mW @ 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 AD9122 is a dual 16-bit, high dynamic range, digital-to-
analog converter (DAC) that provides a sample rate of 1200 MSPS,
permitting a multicarrier generation up to the Nyquist frequency.
It includes features optimized for direct conversion transmit
applications, including complex digital modulation, 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 programming/readback of many
internal parameters. Full-scale output current can be programmed
over a range of 8.7 mA to 31.7 mA. The AD9122 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.
2.
A proprietary DAC output switching technique enhances
dynamic performance.
3.
The current outputs are easily configured for various
single-ended or differential circuit topologies.
4.
Flexible LVDS digital interface allows the standard 32-wire
bus to be reduced to ½ or ¼ of the width.
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
Figure 1.


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