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AD9787 Datasheet دیتاشیت PDF دانلود

دیتاشیت - Analog Devices - Dual 12-/14-/16-Bit 800 MSPS DAC

شماره قطعه AD9787
شرح مفصل Dual 12-/14-/16-Bit 800 MSPS DAC
تولید کننده Analog Devices 
آرم Analog Devices 


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AD9787 شرح
Data Sheet
Dual 12-/14-/16-Bit 800 MSPS DAC
with Low Power 32-Bit Complex NCO
AD9785/AD9787/AD9788
FEATURES
Analog output: adjustable 8.7 mA to 31.7 mA,
RL = 25 Ω to 50 Ω
Low power, fine complex NCO allows carrier placement
anywhere in DAC bandwidth while adding <300 mW power
Auxiliary DACs allow I and Q gain matching and offset control
Includes programmable I and Q phase compensation
Internal digital upconversion capability
Multiple chip synchronization interface
High performance, low noise PLL clock multiplier
Digital inverse sinc filter
100-lead, exposed pad TQFP package
APPLICATIONS
Wireless infrastructure
W-CDMA, CDMA2000, TD-SCDMA, WiMAX, GSM
Digital high or low IF synthesis
Transmit diversity
Wideband communications
LMDS/MMDS, point-to-point
GENERAL DESCRIPTION
The AD9785/AD9787/AD9788 are 12-bit, 14-bit, and 16-bit,
high dynamic range TxDAC® devices, respectively, that provide
a sample rate of 800 MSPS, permitting multicarrier generation
up to the Nyquist frequency. Features are included for optimizing
direct conversion transmit applications, including complex
digital modulation, as well as gain, phase, and offset compens-
ation. The DAC outputs are optimized to interface seamlessly
with analog quadrature modulators, such as the ADL5375
family from Analog Devices, Inc. A serial peripheral interface
(SPI) provides for programming and readback of many internal
parameters. Full-scale output current can be programmed over
a range of 10 mA to 30 mA. The AD9785/AD9787/AD9788
family is manufactured on a 0.18 μm CMOS process and operates
from 1.8 V and 3.3 V supplies. It is enclosed in a 100-lead TQFP
package.
PRODUCT HIGHLIGHTS
1. Low noise and intermodulation distortion (IMD) enable
high quality synthesis of wideband signals from baseband
to high intermediate frequencies.
2. Proprietary DAC output switching technique enhances
dynamic performance.
3. CMOS data input interface with adjustable setup and hold.
4. Low power complex 32-bit numerically controlled
oscillators (NCOs).
COMPLEX I AND Q
DC
FPGA/ASIC/DSP
TYPICAL SIGNAL CHAIN
QUADRATURE
MODULATOR/
MIXER/
AMPLIFIER
DC
LO
DIGITAL INTERPOLATION FILTERS
I DAC
Q DAC
POST DAC
ANALOG FILTER
A
Figure 1.
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 for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. 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 ©2008–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com

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