Application Notes (25)
- AN-953: Direct Digital Synthesis (DDS) with a Programmable Modulus (pdf, 112 kB)
- AN-939: Super-Nyquist Operation of the AD9912 Yields a High RF Output Signal (pdf, 221 kB)
- AN-927: Determining if a Spur is Related to the DDS/DAC or to Some Other Source (For Example, Switching Supplies) (pdf, 170 kB)
- AN-873: Lock Detect on the ADF4xxx Family of PLL Synthesizers (pdf, 207 kB)
- AN-851: A WiMax Double Downconversion IF Sampling Receiver Design (pdf, 262 kB)
- AN-847: Measuring a Grounded Impedance Profile Using the AD5933 (pdf, 294 kB)
- AN-843: Measuring a Loudspeaker Impedance Profile Using the AD5933 (Rev. A, 6/07) (pdf, 284 kB)
- AN-837: DDS-Based Clock Jitter Performance vs. DAC Reconstruction Filter Performance (pdf, 313 kB)
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AN-823: Direct Digital Synthesizers in Clocking Applications Time
(pdf, 115 kB)
Jitter in Direct Digital Synthesizer-Based Clocking Systems - AN-772: A Design and Manufacturing Guide for the Lead Frame Chip Scale Package (LFCSP) (pdf, 439 kB)
- AN-769: Generating Multiple Clock Outputs from the AD9540 (pdf, 0)
- AN-756: Sampled Systems and the Effects of Clock Phase Noise and Jitter (pdf, 291 kB)
- AN-632: Provisionary Data Rates Using the AD9951 DDS as an Agile Reference Clock for the ADN2812 Continuous-Rate CDR (pdf, 138 kB)
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AN-621: Programming the AD9832/AD9835
(pdf, 202 kB)
This application note details how to program 5 MHz on the output of the AD9832/AD9835 parts. The frequency register,defer register,and command sequence are explained in detail. - AN-605: Synchronizing Multiple AD9852 DDS-Based Synthesizers (pdf, 527 kB)
- AN-587: Synchronizing Multiple AD9850/AD9851 DDS-Based Synthesizers (pdf, 116 kB)
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AN-557: An Experimenter's Project:
(pdf, 368 kB)
Incorporating the AD9850 Complete DDS Device as a Digital LO Function in an Amateur Radio Transceiver -
AN-543: High Quality, All-Digital RF Frequency Modulation Generation with the ADSP-2181 and the AD9850 DDS
(pdf, 49 kB)
- AN-543 - Monaural FM Transmitter (dsp, 20 kB)
- AN-543 - Stereo FM Transmitter (dsp, 25 kB)
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AN-501: Aperture Uncertainty and ADC System Performance
(pdf, 227 kB)
A Key Concern in IF Sampling is that of Aperture Uncertainty (Jitter) - AN-423: Amplitude Modulation of the AD9850 Direct Digital Synthesizer (pdf, 37 kB)
- AN-419: A Discrete, Low Phase Noise, 125 MHz Crystal Oscillator for the AD9850 (pdf, 101 kB)
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AN-345: Grounding for Low-and-High-Frequency Circuits
(pdf, 455 kB)
Know Your Ground and Signal Paths for Effective Designs. Current Flow Seeks Path of Least Impedance-Not Just Resistance.... -
AN-342: Analog Signal-Handling for High Speed and Accuracy.
(pdf, 468 kB)
Signal handling techniques for optimizing DAC and ADC performance. -
AN-280: Mixed Signal Circuit Technologies
(pdf, 2101 kB)
Considers problems which arise when reality (& Murphy) intervene in a design which otherwise seems satisfactory in terms of theory and modeling. - AN-237: Choosing DACs for Direct Digital Synthesis (pdf, 1156 kB)
Technical Articles (29)
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400-MSample DDSs Run On Only +1.8 VDC
... This line of highly integrated DDS ICs features on-board RAM and crystal-oscillator circuitry to simplify the generation of agile and exotic waveforms. (Microwaves & RF Cover Story, 12/2002) -
AD9858: Flexible Integrated Synthesizer For Wireless
... The most important feature of the AD9858 is its ability to change frequency in less than 5 ns, meaning that there is virtually no application left where you will need to go the expense of switching between two separate synthesizers. (AnalogZone, RF/IF Zone Products for the Week of 9/23/2002) -
ADI Buys Korean Mobile TV Chip Maker
(EE Times, 6/7/2006) - Basics of Designing a Digital Radio Receiver (Radio 101) (pdf, 77 kB)
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Clock Requirements For Data Converters
(Electronic Design, 2/2005) -
DDS Applications
by Eva Murphy and Colm Slattery, Analog Devices, Inc. (EETimes, 9/26/2005) -
DDS Circuit Generates Precise PWM Waveforms
by Colm Slattery, Analog Devices, Inc. (EDN, 10/2/2003) -
DDS Design
By David Brandon, Analog Devices, Inc.
Direct digital synthesizers are known for their highly accurate digital tuning, low noise figure, and phase-continuous frequency-hopping capabilities, which make them more attractive than alternative analog frequency-synthesis solutions.
(EDN, 5/13/2004) -
DDS Device Produces Sawtooth Waveform
Ramp or sawtooth waveforms are useful for a broad range of applications, including automatic-test equipment, benchtest equipment, and actuator control. (EDN Design Idea, 7/10/2003) -
DDS Device Provides Amplitude Modulation
by Mary McCarthy, Analog Devices, Inc.
(EDN, September 2, 1999) -
DDS IC Initiates Synchronized Signals
(Microwaves & RF Cover Story, July 2005) -
DDS IC Plus Frequency-To-Voltage Converter Make Low-Cost DAC
by Noel McNamara, Analog Devices, Inc. (EDN Design Idea, 2/5/2004) -
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) -
DDS Tackles BaseStations Head On
... This High-Performance, Low-Power Integrated Hybrid Synthesizer Flaunts A 10-b Digital-To-Analog Converter That Operates At Up To 1 GSample/s.
(Wireless Systems Design, September 2002) -
Design A Clock-Distribution Strategy With Confidence
by Demetrios Efstathiou (Electronic Design, April 27, 2006) -
Digital Potentiometers Vary Amplitude In DDS Devices
(Electronic Design, Ideas for Design, 5/29/2000) - Digital Up/Down Converters: VersaCOMM™ White Paper (pdf, 97 kB)
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Digital Waveform Generator Provides Flexible Frequency Tuning for Sensor Measurement
by Colm Slattery, Analog Devices (EDN, 12/17/2004) -
Improved DDS Devices Enable Advanced Comm Systems
by Valoree Young, Analog Devices
(Electronic Products, September 2006) -
Integrated DDS Chip Takes Steps To 2.7 GHz
This highly integrated 2.7-GHz source includes all essential DDS circuitry along with a clock driver, divider, high-resolution DAC, and combination phase detector/charge pump. (ED Online, April 2004) -
Introducing Digital Up/Down Converters: VersaCOMM™ Reconfigurable Digital Converters
(pdf, 63 kB)
Revolutionize your radio architectures - Low-power direct digital synthesizer cores enable high level of integration
-
Simple Circuit Controls Stepper Motors
by Noel McNamara, Analog Devices, Inc. (EDN Design Idea, 1/8/04) -
Speedy A/Ds Demand Stable Clocks
by Jeff Keip, Analog Devices, Inc. (EE Times, 3/18/04) -
Synchronized Synthesizers Aid Multichannel Systems
by David Brandon and John Kornblum, Analog Devices, Inc. (Microwaves & RF, 9/2005) -
The Year of the Waveform Generator
(Test & Measurement World, 12/1/2005) -
Two DDS ICs Implement Amplitude-shift Keying
by Noel McNamara, Analog Devices, Inc. (EDN Design Idea, 12/25/2003) -
Understand the Effects of Clock Jitter and Phase Noise on Sampled Systems
... Much of your system's performance depends on jitter specifications, so careful assessment is critical.
by Brad Brannon, Analog Devices (EDN, 12/7/2004) -
Video Portables and Cameras Get HDMI Outputs
By Doug Bartow, Analog Devices, Inc.
Analog Dialogue (1)
-
Ask The Application Engineer—33: All About Direct Digital Synthesis
(Analog Dialogue, Vol. 38, August 2004)
Data Sheets (1)
- Are outputs short-circuit protected?
- Are the ADI clock parts stand-alone clock sources or do I still have to buy a clock source to drive these parts?
- Are the CMOS drivers on the clock devices complementary?
- Can I get two clock outputs from the AD9540?
- Can I run CMOS outputs at 5V?
- Can I shift the threshold on clocks for single-ended inputs?
- Can I tri-state the AD9510 outputs?
- Can I use different power supply voltages for the PECL output drivers?
- Can I use the 951X clocks to drive a mixer (RF LO)?
- Do different divide ratios cause variations in jitter?
- Do divide ratios change the propagation delay?
- Do VCXOs have better phase noise and jitter performance than VCOs?
- Do you guarantee performance shown in ADIsimCLK?
- Does Analog Devices offer a list of manufacturers of oscillators for DDS devices?
- Does jitter vary with different clock frequencies? How about phase noise?
- Does the AD9510 support 2.5V PECL?
- Does the fine delay adjust affect the jitter?
- Help! My PLL came unlocked over temperature.
- How can I determine the die temperature of your device?
- How do harmonic spurs in the output spectrum affect jitter (random or deterministic)?
- How do I choose between active and passive filter in PLL loop?
- How do I determine if a VCO is good enough for my purpose?
- How do I feed a single-ended signal into a differential input?
- How do I get two AD951x (with PLL) to synchronize to the same reference input edge?
- How do I know which VCO will work best with the AD9510?
- How do I optimize my PLL loop for the best phase noise and/or jitter?
- How do I synchronize multiple clock devices?
- How do I use a VCO with a supply greater than 5V?
- How do I use the clock part for jitter clean-up?
- How do the PLLs in the AD951x parts compare to other ADI PLLs?
- How do you determine the bandwidth over which phase noise is integrated to obtain jitter?
- How do you specify jitter?
- How does the clock clean-up function of the AD951x parts work?
- How good does my input signal need to be?
- How long does it take for the PLL to lock?
- How much bandwidth is required to process a PECL or LVDS output?
- I am not using the CLK1 input on the AD9510. Can I just leave it floating?
- I changed the coarse phase adjust in the evaluation software, but nothing happened. What's going on?
- I have a clocking scheme which requires several different division ratios simultaneously. I have a frequency plan, but I'm concerned about crosstalk. How much of a problem is this with your clock distribution chips?
- I have an input present at the clock input, but I'm not seeing an output?
- I have pulled SYNCB low, but I still have output from a channel. Why?
- I ran the AD9510 outputs at 1.4 GHz and they seem to work fine. Is there a problem running them at 1.4 GHz?
- I really need >10 clock outputs. Can I use multiple chips together and still guarantee that all output clocks are synchronized to REFIN?
- I sure can't measure jitter with femtosecond resolution on my scope! How do you do it? How much confidence do you have in the jitter figures that you are quoting for these parts?
- I turned off my reference but the Digital Lock Detect (DLD) still says I'm locked.
- I want to use the phase offset feature on the AD9510 dividers to generate two signals 90° out of phase. How accurate is the phase offset?
- I want to use the variable delay adjust, but the jitter is too high. What can I do?
- I'm trying to write to the part in single-byte mode, but I can't write anything. What am I doing wrong?
- I'm working with optical networks - SONET/SDH. Do ADI's clock chips support these applications?
- If I change the level of PECL output, does it affect the jitter?
- If I use only one of the PECL differential outputs and the unused output is terminated in 50Ω, how will this affect the phase noise or jitter of the single-ended output?
- If jitter can be calculated from phase noise measurements, is it possible to calculate phase noise from jitter numbers?
- Is .01 uF sufficient for power supply pin bypass?
- Is it ok for me to connect the same power supply to both the charge pump and distribution power supply pins?
- Is it okay to AC-couple PECL or LVDS outputs?
- Is it possible to impedance match a clock output if it is heavily loaded? (e.g. CL=100pF)
- Is there a way to cause Input/Output rising edges to be synchronous (zero delay) with the AD9510/11?
- Is there an advantage to running a higher VCO frequency than the output frequency?
- Is there any difference between the nature of an oscillator's phase noise and the phase noise from a clock chip?
- Is there any reason to use a transformer on a differential clock output to obtain a "clean" single-ended clock output?
- May I use the AD9540 for spread spectrum clocking?
- My application has pretty tight power consumption requirements. I am very interested in the capabilities of the AD9510, but I don't need every feature. Is it possible to turn off the unused features and save power?
- My applications are RF, not for clocking data converters. Can ADI's 951X ICs be used for RF applications?
- My circuit board has both an analog GND and a digital GND. How should I connect the AD9510 pins labeled GND?
- My evaluation board is not working; the software is reporting a USB Communication Error. I verified that the evaluation board is connected to the PC and powered. What else can I check?
- My loop is not locking. How do I debug this?
- On my board, I can't get the same low jitter numbers that are shown in the datasheet. Am I doing something wrong?
- On the AD9510, how can I make sure that the duty cycle of output clocks stays within 40% to 60% duty cycle window?
- On the AD9510, what is the relationship between clock output jitter and CLK1/CLK2 input slew rate?
- On the AD951x clock ICs, does the phase offset (coarse delay) affect the jitter?
- Should I reference the passive filter to ground? or supply?
- Should I tie my loop filter to ground or PLL supply?
- Should I use the minimum charge pump current settings in order to minimize power?
- Some of the schematics in the AD951x data sheets show an LVPECL termination scheme which is different from the classic termination often seen (50 Ω to Vs - 2V, or the Thevenin equivalent thereof). How does this work, and how did you chose 200 Ω for the resistors? Can I use 100 ohms to improve the slew rate (or jitter)?
- The AD9510 datasheet says to use an external pull-up resistor on the FUNCTION pin. Why do I need this and what range of resistors will work?
- The loop filter was working great until I changed the divide ratio in PLL. What happened?
- The reference input is differential, but my reference is single-ended. Do I need to convert to differential to drive the AD9510?
- Using the "ADC SNR method", what is the equivalent bandwidth for the jitter specification?
- What are some of the advantages/disadvantages of using LVPECL vs. LVDS outputs?
- What are the best clock sources for a distribution-only design?
- What clock frequency comes out of the AD9510 outputs when you first apply power to the device?
- What happens if I run the part in an ambient environment which exceeds 85°C?
- What happens to the AD9510/11 clock outputs if the Reference Input (REFIN) signal goes away?
- What is the best way to terminate LVPECL outputs to get lowest jitter?
- What is the difference between the coarse phase adjust and the fine delay adjust?
- What is the effect of distributing harmonically related clocks (on chip or on board) in terms of jitter?
- What is the fan-out capability of the CMOS, LVDS, and LVPECL outputs?
- What is the fine delay adjust which is available on certain LVDS/CMOS outputs?
- What is the proper termination (value and location) for outputs?
- What PCB layout recommendations do you have for the of the exposed paddle on the bottom side of the LFCSP package?
- What should I do with unused channels on the AD9510?
- What suppliers do you recommend for VCO/VCXOs?
- What's the advantage of a DDS-based clock generator?
- When a jitter number is specified without an associated bandwidth, what bandwidth should be assumed?
- Where can I find some good background material on direct digital synthesis?
- Which provides better performance - a clock source with sinewave output, or one with differential square wave outputs?
- Who do I contact for technical support on ADIsimCLK?
- Why can I not get the same output amplitude or rise and fall times as stated in your datasheet?
- Why can't I use a bandpass filter for my loop filter?
- Why do I see reference spurs?
- Why do I want to run a fast PFD frequency?
- Why do you recommend AC coupling, rather than DC coupling, at the clock inputs?
- Why does the AD9540 require special filtering on its analog output. What are the requirements of this filter?
- Why doesn't the mini-divider support the divide ratio I want?
- Why doesn't the PLL make my reference input and the clock outputs line up?
- Why don't you spec psrr and cmrr in the datasheet?
- Why is my phase noise shape changing when I change the PLL settings?
- Why is the fine delay adjust not available on all the outputs?
- Why should I use differential rather than single-ended?
- Will differential or single-ended inputs/outputs improve my jitter?
- Will the AD9510 work without a reference input signal?
Glossary (1)
Overview (6)
- Clock and Timing ICs (pdf, 4970 kB)
- Expanding Family of Integrated Clock ICs
- Leading Inside Advertorials: Single-Chip Clock Generator with 14-Channel Distribution Solves Timing Challenges in Networks (pdf, 64 kB)
-
Optical and High Speed Networking
(pdf, 2236 kB)
Analog Devices’ optical and high speed networking ICs solve a depth and breadth of challenges faced by today’s designers of datacom and telecom systems, optical modules, and subsystems. Analog Devices products address a wide range of networking applications from O/E/O conversion, clock recovery, and backplane transmission to monitoring and control of optical power, power management, and clock generation and distribution. -
Reset your thinking about clocks.
(pdf, 153 kB)
... In precision timing, analog is everywhere. -
RF Source Booklet
(pdf, 815 kB)
RF IC Product Overview - Version O (11/2012)
Product Reviews (7)
-
Circuit Simulation Tool Simplifies Clock Designs
(eeProductCenter, 8/23/2005) -
Clock-circuit-design Tool Recovers Engineer Time
(EDN, 8/23/2005) -
Free Direct Digital Synthesis IC Evaluation Tool
(Control Engineering, 9/14/2006) -
Low Jitter Clock Generator for Data Converters
... Analog Devices' first dedicated clocking product supporting the stringent needs of high performance data converters. (AVNET Technology Review, November 2004, Vol. 10, Issue 11) -
On-Line Evaluation Tool Simplifies Implementing DDS Semiconductors
(eeProductCenter, 8/16/2006) -
Ultra-low Jitter Performance Marks Analog Devices' Entry into the Clock IC Market
(eeProductCenter, 12/8/04) -
Where Analog Really Meets Digital
(EE Time, 8/29/2005)
Technical Documentation (1)
-
Analog-to-Digital Converter Clock Optimization: A Test Engineering Perspective
(pdf, 909 kB)
By Rob Reeder, Wayne Green, and Robert Shillito
