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AD9856:  CMOS 200 MHz Quadrature Digital Upconverter

Product Details

The AD9856 integrates a high-speed direct-digital synthesizer (DDS), a high-performance, high-speed 12-bit Digital-to-Analog converter (DAC), clock multiplier circuitry, digital filters, and other DSP functions onto a single chip, to form a complete quadrature digital upconverter device. The AD9856 is primarily intended to function as a universal upstream and downstream I/Q modulator for interactive HFC cable network applications, where cost, size, power dissipation, and dynamic performance are critical attributes.


  • Universal Low Cost Modulator Solution for Communications Applications
  • DC to 80 MHz Output Bandwidth
  • Integrated 12-Bit D/A Converter
  • Programmable Sample Rate Interpolation Filter
  • Programmable Reference Clock Multiplier
  • Internal SIN(x)/x Compensation Filter
  • >52 dB SFDR @ 40 MHz AOUT
  • +3 V Single Supply Operation
  • >48 dB SFDR @ 70 MHz AOUT
  • >80 dB Narrowband SFDR @ 70 MHz AOUT
  • Space-Saving Surface-Mount Packaging
  • Bidirectional Control Bus Interface

Functional Block Diagram for AD9856


Title Content Type File Type
AD9856: CMOS 200 MHz Quadrature Digital Upconverter Data Sheet  (Rev C, 01/2005) (pdf, 959 kB) Data Sheets PDF
AN-922: Digital Pulse-Shaping Filter Basics  (pdf, 1582 kB) Application Notes PDF
AN-924: Digital Quadrature Modulator Gain  (pdf, 105 kB) Application Notes PDF
AN-837: DDS-Based Clock Jitter Performance vs. DAC Reconstruction Filter Performance  (pdf, 313 kB) Application Notes PDF
AN-772: A Design and Manufacturing Guide for the Lead Frame Chip Scale Package (LFCSP)  (pdf, 439 kB) Application Notes PDF
AN-823: Direct Digital Synthesizers in Clocking Applications Time  (pdf, 115 kB)
Jitter in Direct Digital Synthesizer-Based Clocking Systems
Application Notes PDF
AN-851: A WiMax Double Downconversion IF Sampling Receiver Design  (pdf, 262 kB) Application Notes PDF
AN-237: Choosing DACs for Direct Digital Synthesis  (pdf, 1156 kB) Application Notes PDF
A Technical Tutorial on Digital Signal Synthesis  (pdf, 901 kB)
Copyright © 1999 Analog Devices, Inc.
Design Handbooks PDF
Fundamentals of Frequency Synthesis, Part 2: Direct Digital Synthesis (DDS)
This month we conclude our two-part series on frequency synthesis, with an introduction to Direct Digital Synthesis. We will give a basic review of how a direct digital synthesis system works, touching on the inner workings of the DDS engine at a relatively high level. We will also discuss the tradeoffs between PLL and DDS technology as a base choice for frequency synthesis needs.
Webcasts WEBCAST
Performance Clocks: Demystifying Jitter
Join us as we delve into the realm of sub-picosecond jitter clocks. The relationship between jitter and phase noise will be explored in detail and methods for measuring sub-picosecond jitter and ultra low phase noise will be presented and discussed.
Webcasts WEBCAST
Speedy A/Ds Demand Stable Clocks
by Jeff Keip, Analog Devices, Inc. (EE Times, 3/18/04)
Technical Articles HTML
Improved DDS Devices Enable Advanced Comm Systems
by Valoree Young, Analog Devices
(Electronic Products, September 2006)
Technical Articles HTML
Introducing Digital Up/Down Converters: VersaCOMM™ Reconfigurable Digital Converters  (pdf, 63 kB)
Revolutionize your radio architectures
Technical Articles PDF
Digital Up/Down Converters: VersaCOMM™ White Paper  (pdf, 97 kB) Technical Articles PDF
Basics of Designing a Digital Radio Receiver (Radio 101)  (pdf, 77 kB) Technical Articles PDF
The Year of the Waveform Generator
(Test & Measurement World, 12/1/2005)
Technical Articles HTML
DDS Simplifies Polar Modulation
By Ken Gentile, Analog Devices ... Basic modulation mathematics and DDS (direct digital synthesis) provide designers with an all-digital technique for generating polar-encoded carrier signals. (EDN, 8/5/2004)
Technical Articles HTML
Ask The Application Engineer—33: All About Direct Digital Synthesis
(Analog Dialogue, Vol. 38, August 2004)
Analog Dialogue HTML
Free Direct Digital Synthesis IC Evaluation Tool
(Control Engineering, 9/14/2006)
Product Reviews HTML
On-Line Evaluation Tool Simplifies Implementing DDS Semiconductors
(eeProductCenter, 8/16/2006)
Product Reviews HTML
Are there any specific recommendations for material in the vias of the circuit board for the thermally enhanced package styles in which some ADI DDS' are available? FAQs/RAQs HTML
I have limited experience working with thermally enhanced packages. Where can I get information concerning the proper techniques for soldering and assembly? FAQs/RAQs HTML
I need to operate my DDS part above the rated temperature range. Can you give me any reliability data? FAQs/RAQs HTML
Are any of your DDS products space qualified? FAQs/RAQs HTML
Why did the model numbers change on the AD9852 and AD9854 products? I thought they were available in the ASQ package. FAQs/RAQs HTML
If the port has a differential REF CLK, and I want to use a single-ended clock, what do I do with the other differential input? FAQs/RAQs HTML
If I violate the proper logic level of the REF CLK (that is, underdrive or overdrive it), what can I expect? FAQs/RAQs HTML
What type of signal source is recommended? FAQs/RAQs HTML
Why does spectral performance degrade when using larger values of multiplication on the clock multiplier? FAQs/RAQs HTML
Can the DDS evaluation boards be integrated directly into a system project? FAQs/RAQs HTML
I am having problems getting my evaluation software to see my evaluation board; what should I do to correct the problem? FAQs/RAQs HTML
Is all DDS software supplied by Analog Devices compatible with all WinXX versions? FAQs/RAQs HTML
What is the proper termination for the DAC outputs for the DDS products? FAQs/RAQs HTML
Why can't I see a signal at the output of my DDS when it is unterminated? (I'm setting everything correctly, but I'm just probing the output pins of the DDS which have nothing connected to them.) FAQs/RAQs HTML
How can I synchronize multiple DDS parts? FAQs/RAQs HTML
Can I gate the REF CLK on and off? FAQs/RAQs HTML
What kind of problems can I expect from exceeding the maximum clock rate? (power dissipation, spectral problems) FAQs/RAQs HTML
What is the effect of REF CLK jitter on the DDS? FAQs/RAQs HTML
What are the proper logic input levels for the DDS parts? FAQs/RAQs HTML
What are the advantages and disadvantages of serial and parallel mode? FAQs/RAQs HTML
Can I read back data at the same rate that I can write the data to the DDS device? FAQs/RAQs HTML
What logic families can interface with our parts? FAQs/RAQs HTML
What is the maximum speed I can write to the part? FAQs/RAQs HTML
I would like to update the FTW of my DDS, but only a single byte of the FTW needs to change. Can the frequency tuning word of a DDS be partially updated a byte at a time? FAQs/RAQs HTML
What layout recommendations do you have for the power supply pins of the DDS device? FAQs/RAQs HTML
What is the effect of increasing my supply voltage beyond the nominal recommended value? FAQs/RAQs HTML
I have limited power to supply to the part. What can I do to reduce the power consumption of the device and thus ensure that my supply is adequate? FAQs/RAQs HTML
Do you recommend a linear or switching power supply? FAQs/RAQs HTML
Should I separate digital and analog ground planes on my evaluation board? FAQs/RAQs HTML
Can I use the same power supply for AVDD and DVDD? FAQs/RAQs HTML
What is the ratio between the analog and digital currents drawn by the DDS devices? FAQs/RAQs HTML
I'm not using all the blocks of the AD9858. What do I do with the unused inputs of these sections? FAQs/RAQs HTML
What causes a Quadrature Digital Upconverter (AD9856, AD9857) to go into a CIC overflow condition? FAQs/RAQs HTML
How do I use a DDS for a clock driver? FAQs/RAQs HTML
How do I perform amplitude modulation on the output? FAQs/RAQs HTML
How can I control the envelope of the output? FAQs/RAQs HTML
How do I change the phase of my output signal? FAQs/RAQs HTML
Are frequency changes of a DDS phase coherent? FAQs/RAQs HTML
What type of frequency sweeping is available? FAQs/RAQs HTML
What type of automatic frequency sweeping modes does each of your DDS parts support? FAQs/RAQs HTML
Does Analog Devices offer a list of manufacturers of oscillators for DDS devices? FAQs/RAQs HTML
Where can I find some good background material on direct digital synthesis? FAQs/RAQs HTML
Do you have a DDS overview? FAQs/RAQs HTML
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Evaluation Kits & Symbols & Footprints

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

SampleSample & Buy

Price, packaging, availability

AD9856 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD9856AST Status: Obsolete 48 ld LQFP 48 Ind Tray, 250 - - N  Material Info Notify Me Contact ADI
AD9856ASTZ Status: Production 48 ld LQFP 48 Ind Tray, 250 $35.07 $29.81 Y  Material Info PCN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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