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AD9957:  1 GSPS Quadrature Digital Upconverter with 18-Bit IQ Data Path and 14-Bit DAC

Product Details

Product Status:Recommended for New Designs

The AD9957 functions as a universal I/Q modulator and agile upconverter for communications systems where cost, size, power consumption, and dynamic performance are critical. The AD9957 integrates a high speed, direct digital synthesizer (DDS), a high performance, high speed, 14-bit digital-to-analog converter (DAC), clock multiplier circuitry, digital filters, and other DSP functions onto a single chip. It provides baseband upconversion for data transmission in a wired or wireless communications system.

The AD9957 is the third offering in a family of quadrature digital upconverters (QDUCs) that includes the AD9857 and AD9856. It offers performance gains in operating speed, power consumption, and spectral performance. Unlike its predecessors, it supports a 16-bit serial input mode for I/Q baseband data. The device can alternatively be programmed to operate either as a single tone, sinusoidal source or as an interpolating DAC.

The reference clock input circuitry includes a crystal oscillator, a high speed, divide-by-two input, and a low noise PLL for multiplication of the reference clock frequency.

The user interface to the control functions includes a serial port easily configured to interface to the SPORT of the Blackfin® DSP and profile pins to enable fast and easy shift keying of any signal parameter (phase, frequency, or amplitude).


  • HFC data, telephony, and video modems
  • Wireless base station transmissions
  • Broadband communications transmissions
  • Internet telephony


  • Chinese data sheet available
  • 1 GSPS internal clock speed (up to 400 MHz analog output)
  • Integrated 1 GSPS 14-bit DAC
  • 250 MHz I/Q data throughput rate
  • Phase noise ≤ −125 dBc/Hz (400 MHz carrier @ 1 kHz offset)
  • Excellent dynamic performance >80 dB narrow-band SFDR
  • 8 programmable profiles for shift keying
  • Multichip synchronization
  • See Data Sheet for Additional Information

Functional Block Diagram for AD9957


Title Content Type File Type
AD9957: 1 GSPS Quadrature Digital Upconverter with 18-Bit IQ Data Path and 14-Bit DAC Data Sheet (Rev C, 04/2012) (pdf, 1212 kB) Data Sheets PDF
AN-0996: The Advantages of Using a Quadrature Digital Upconverter (QDUC) in Point-to-Point Microwave Transmit Systems  (pdf, 219 kB) Application Notes 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
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
UG-208: Evaluation Board User Guide for AD9957  (pdf, 1296 kB)
1 GSPS Quadrature Digital Upconverter with 14-Bit DAC Evaluation Board
User Guides PDF
Improved DDS Devices Enable Advanced Comm Systems
by Valoree Young, Analog Devices
(Electronic Products, September 2006)
Technical Articles HTML
Free Direct Digital Synthesis IC Evaluation Tool
(Control Engineering, 9/14/2006)
Product Reviews HTML
Analog - Industy's Fastest Digital Synthesizers Integrate 14-Bit DACs
(Electropages, 1/15/2007)
Product Reviews HTML
Specialized Data Converters Move Up The Signal Chain
(Electronic Design, 1/11/2007)
Product Reviews HTML
Synthesizer ICs with On-Chip 14-Bit DACs Tout 1 GSPS Operation
(eeProductCenter, 12/5/2006)
Product Reviews HTML
RAQs index Rarely Asked Questions 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
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD9957 IBIS Model IBIS Models HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

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.

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Price, packaging, availability

AD9957 Model Options
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.

AD9957 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
AD9957/PCBZ Status: Production Evaluation Board $400.00 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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