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AD9125 Arkusz danych(PDF) 1 Page - Analog Devices

Numer części AD9125
Szczegółowy opis  Dual, 16-Bit, 1000 MSPS, TxDAC Digital-to-Analog Converter
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Strona internetowa  http://www.analog.com
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AD9125 Arkusz danych(HTML) 1 Page - Analog Devices

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Dual, 16-Bit, 1000 MSPS,
TxDAC+ Digital-to-Analog Converter
AD9125
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
©2010 Analog Devices, Inc. All rights reserved.
FEATURES
Flexible CMOS interface allows dual-word, word, or byte load
Single-carrier W-CDMA ACLR = 80 dBc at 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
Gain and phase adjustment for sideband suppression
Multichip synchronization interface
High performance, low noise PLL clock multiplier
Digital inverse sinc filter
Low power: 900 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
Cable modem termination systems
GENERAL DESCRIPTION
The AD9125 is a dual, 16-bit, high dynamic range TxDAC+®
digital-to-analog converter (DAC) that provides a sample rate of
1000 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 allows programming/readback of many inter-
nal parameters. Full-scale output current can be programmed
over a range of 8.7 mA to 31.7 mA. The AD9125 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.
The flexible CMOS digital interface allows the standard
32-wire bus to be reduced to a 16-wire bus.
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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