Overview
Features and Benefits
- 125 MHz Clock Rate
- On-Chip High Performance DAC and High Speed Comparator
- DAC SFDR > 50 dB @ 40 MHz AOUT
- 32-Bit Frequency Tuning Word
- Simplified Control Interface: Parallel Byte or Serial Loading Format
- Phase Modulation Capability
- 3.3 V or 5 V Single-Supply Operation
- Low Power: 380 mW @ 125 MHz (5 V)
- 155 mW @ 100 MHz (3.3 V)
- Power-Down Function
- Ultrasmall 28-Lead SSOP Packaging
Product Details
The AD9850 is a highly integrated device that uses advanced DDS technology coupled with an internal high speed, high performance, D/A converter and comparator, to form a complete digitally programmable frequency synthesizer and clock generator function. When referenced to an accurate clock source, the AD9850 generates a spectrally pure, frequency/ phase-programmable, analog output sine wave. This sine wave can be used directly as a frequency source or converted to a square wave for agile-clock generator applications. The AD9850’s innovative high speed DDS core provides a 32-bit frequency tuning word, which results in an output tuning resolution of 0.0291 Hz, for a 125 MHz reference clock input. The AD9850’s circuit architecture allows the generation of output frequencies of up to one-half the reference clock frequency (or 62.5 MHz), and the output frequency can be digitally changed (asynchronously) at a rate of up to 23 million new frequencies per second. The device also provides five bits of digitally controlled phase modulation, which enables phase shifting of its output in increments of 180°, 90°, 45°, 22.5°, 11.25° and any combination thereof. The AD9850 also contains a high speed comparator that can be configured to accept the (externally) filtered output of the DAC to generate a low jitter square wave output. This facilitates the device’s use as an agile clock generator function.
The frequency tuning, control, and phase modulation words are loaded into the AD9850 via a parallel byte or serial loading format. The parallel load format consists of five iterative loads of an 8-bit control word (byte). The first byte controls phase modulation, power-down enable, and loading format; bytes 2–5 comprise the 32-bit frequency tuning word. Serial loading is accomplished via a 40-bit serial data stream on a single pin. The AD9850 Complete-DDS uses advanced CMOS technology to provide this breakthrough level of functionality and performance on just 155 mW of power dissipation (+3.3 V supply).
The AD9850 is available in a space saving 28-lead SSOP, surface mount package. It is specified to operate over the extended industrial temperature range of –40°C to +85°C
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
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AN-769: Generating Multiple Clock Outputs from the AD9540 (Rev. 0)2/14/2015
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AN-939: Super-Nyquist Operation of the AD9912 Yields a High RF Output Signal (Rev. 0)2/14/2015
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AN-837: DDS-Based Clock Jitter Performance vs. DAC Reconstruction Filter Performance (Rev. 0)2/14/2015
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AN-557: An Experimenter's Project: (Rev. 0)2/14/2015
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AN-419: A Discrete, Low Phase Noise, 125 MHz Crystal Oscillator for the AD98502/14/2015
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AN-237: Choosing DACs for Direct Digital Synthesis2/14/2015
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AN-423: Amplitude Modulation of the AD9850 Direct Digital Synthesizer2/14/2015
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AN-345: Grounding for Low-and-High-Frequency Circuits2/14/2015
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AN-342: Analog Signal-Handling for High Speed and Accuracy2/14/2015
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AN-823: Direct Digital Synthesizers in Clocking Applications Time (Rev. 0)2/14/2015
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AN-280: Mixed Signal Circuit Technologies2/14/2015
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AN-605: Synchronizing Multiple AD9852 DDS-Based Synthesizers (Rev. 0)2/14/2015
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AN-927: Determining if a Spur is Related to the DDS/DAC or to Some Other Source (For Example, Switching Supplies) (Rev. 0)2/14/2015
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AN-587: Synchronizing Multiple AD9850/AD9851 DDS-Based Synthesizers (Rev. 0)2/14/2015
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AN-953: Direct Digital Synthesis (DDS) with a Programmable Modulus (Rev. B)3/27/2008
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AN-843: Measuring a Loudspeaker Impedance Profile Using the AD5933 (Rev. A)6/27/2007
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AN-851: A WiMax Double Downconversion IF Sampling Receiver Design (Rev. 0)7/26/2006
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AN-847: Measuring a Grounded Impedance Profile Using the AD5933 (Rev. A)6/20/2006
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AN-632: Provisionary Data Rates Using the AD9951 DDS as an Agile Reference Clock for the ADN2812 Continuous-Rate CDR (Rev. 0)9/25/2003
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AN-543: High Quality, All-Digital RF Frequency Modulation Generation with the ADSP-2181 and the AD9850 DDS9/12/2002
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• AN-543 - Monaural FM Transmitter
DSP -
• AN-543 - Stereo FM Transmitter
DSP
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FAQs7/26/2017
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Video Portables and Cameras Get HDMI Outputs4/13/2007
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Improved DDS Devices Enable Advanced Comm Systems9/1/2006
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ADI Buys Korean Mobile TV Chip Maker6/7/2006
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The Year of the Waveform Generator12/1/2005
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DDS Applications9/26/2005
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Synchronized Synthesizers Aid Multichannel Systems9/20/2005
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DDS IC Initiates Synchronized Signals7/20/2005
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Digital Waveform Generator Provides Flexible Frequency Tuning for Sensor Measurement12/7/2004
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DDS Simplifies Polar Modulation8/5/2004
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DDS Design5/13/2004
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Integrated DDS Chip Takes Steps To 2.7 GHz4/28/2004
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Speedy A/Ds Demand Stable Clocks3/22/2004
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DDS IC Plus Frequency-To-Voltage Converter Make Low-Cost DAC2/5/2004
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Simple Circuit Controls Stepper Motors1/8/2004
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Two DDS ICs Implement Amplitude-shift Keying12/25/2003
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DDS Circuit Generates Precise PWM Waveforms10/2/2003
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DDS Device Produces Sawtooth Waveform7/10/2003
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400-MSample DDSs Run On Only +1.8 VDC12/1/2002
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Digital Potentiometers Vary Amplitude In DDS Devices5/29/2000
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DDS Device Provides Amplitude Modulation9/2/1999
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Basics of Designing a Digital Radio Receiver (Radio 101)3/6/1998
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Single-Chip Direct Digital Synthesis vs. the Analog PLL7/1/1996 Analog Dialogue
Tools & Simulations
Design Tool
ADIsimDDS (Direct Digital Synthesis)
ADIsimDDS uses mathematical equations to model and illustrate the overall performance of the selected device. ADIsimDDS calculates the required FTW, given the reference clock frequency and desired output frequency. This tool also models an estimate of the overall spectral performance, and allows the user to explore the effects of external reconstruction filters.
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| AD9850BRS | Material Declaration | Reliability Data | 28-Lead SSOP | |
| AD9850BRSZ | Material Declaration | Reliability Data | 28-Lead SSOP | |
| AD9850BRSZ-REEL | Material Declaration | Reliability Data | 28-Lead SSOP | |
| Wafer Fabrication Data |
PCN-PDN Information
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Support & Discussions
AD9850 Discussions
Sample & Buy
Ordering FAQs
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Buy Now Pricing
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List Pricing
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Lead Times
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Sampling
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