Features and Benefits
- 4 synchronized DDS channels at 500 MSPS
- Independent frequency/phase/amplitude control between channels
- Matched latencies for frequency/phase/amplitude changes
- Excellent channel-to-channel isolation (>65 dB)
- Linear frequency/phase/amplitude sweeping capability
- Up to 16 levels of frequency/phase/amplitude modulation (pin-selectable)
- 4 integrated 10-bit digital-to-analog converters (DACs)
- Individually programmable DAC full-scale currents
- 0.12 Hz or better frequency tuning resolution
- 14-bit phase offset resolution
- 10-bit output amplitude scaling resolution
- Serial I/O port interface (SPI) with enhanced data throughput
- Software-/hardware-controlled power-down
- Dual supply operation (1.8 V DDS core/3.3 V serial I/O)
- Multiple device synchronization
- Selectable 4× to 20× REFCLK multiplier (PLL)
- Selectable REFCLK crystal oscillator
- 56-lead LFCSP package
The AD9959 consists of four direct digital synthesizer (DDS) cores that provide independent frequency, phase, and amplitude control on each channel. This flexibility can be used to correct imbalances between signals due to analog processing, such as filtering, amplification, or PCB layout-related mismatches. Because all channels share a common system clock, they are inherently synchronized. Synchronization of multiple devices is supported.
The AD9959 can perform up to a 16-level modulation of fre- quency, phase, or amplitude (FSK, PSK, ASK). Modulation is performed by applying data to the profile pins. In addition, the AD9959 also supports linear sweep of frequency, phase, or amplitude for applications such as radar and instrumentation.
The AD9959 serial I/O port offers multiple configurations to provide significant flexibility. The serial I/O port offers an SPI- compatible mode of operation that is virtually identical to the SPI operation found in earlier Analog Devices, Inc., DDS products. Flexibility is provided by four data pins (SDIO_0/SDIO_1/SDIO_2/SDIO_3) that allow four programmable modes of serial I/O operation.
The AD9959 uses advanced DDS technology that provides low power dissipation with high performance. The device incorporates four integrated, high speed 10-bit DACs with excellent wideband and narrow-band SFDR. Each channel has a dedicated 32-bit frequency tuning word, 14 bits of phase offset, and a 10-bit output scale multiplier.
The DAC outputs are supply referenced and must be terminated into AVDD by a resistor or an AVDD center-tapped transformer. Each DAC has its own programmable reference to enable different full-scale currents for each channel.
The DDS acts as a high resolution frequency divider with the REFCLK as the input and the DAC providing the output. The REFCLK input source is common to all channels and can be driven directly or used in combination with an integrated REFCLK multiplier (PLL) up to a maximum of 500 MSPS. The PLL multiplication factor is programmable from 4 to 20, in integer steps. The REFCLK input also features an oscillator circuit to support an external crystal as the REFCLK source. The crystal must be between 20 MHz and 30 MHz. The crystal can be used in combination with the REFCLK multiplier.
The AD9959 comes in a space-saving 56-lead LFCSP package. The DDS core (AVDD and DVDD pins) is powered by a 1.8 V supply. The digital I/O interface (SPI) operates at 3.3 V and requires DVDD_I/O (Pin 49) be connected to 3.3 V.
The AD9959 operates over the industrial temperature range of −40°C to +85°C.
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
The AD9959 is a multichannel frequency synthesizer that incorporates four synchronous direct digital synthesis (DDS) cores with many user-programmable functions. The evaluation board software provides a graphical user interface for easy communication with the device along with many user-friendly features such as the “mouse-over effect.” Many elements of the software can be clarified by placing your mouse over the element. Figure 19 in the user guide shows how this feature works when users place their mouse over the Ref Clock box. The user guide is intended for use in conjunction with the AD9959 data sheet.
Documentation & Resources
AN-769: Generating Multiple Clock Outputs from the AD9540 (Rev. 0)2/14/2015
AN-939: Super-Nyquist Operation of the AD9912 Yields a High RF Output Signal (Rev. 0)2/14/2015
AN-837: DDS-Based Clock Jitter Performance vs. DAC Reconstruction Filter Performance (Rev. 0)2/14/2015
AN-557: An Experimenter's Project: (Rev. 0)2/14/2015
AN-419: A Discrete, Low Phase Noise, 125 MHz Crystal Oscillator for the AD98502/14/2015
AN-237: Choosing DACs for Direct Digital Synthesis2/14/2015
AN-423: Amplitude Modulation of the AD9850 Direct Digital Synthesizer2/14/2015
AN-345: Grounding for Low-and-High-Frequency Circuits2/14/2015
AN-342: Analog Signal-Handling for High Speed and Accuracy2/14/2015
AN-823: Direct Digital Synthesizers in Clocking Applications Time (Rev. 0)2/14/2015
AN-280: Mixed Signal Circuit Technologies2/14/2015
AN-605: Synchronizing Multiple AD9852 DDS-Based Synthesizers (Rev. 0)2/14/2015
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
AN-587: Synchronizing Multiple AD9850/AD9851 DDS-Based Synthesizers (Rev. 0)2/14/2015
AN-953: Direct Digital Synthesis (DDS) with a Programmable Modulus (Rev. B)3/27/2008
AN-851: A WiMax Double Downconversion IF Sampling Receiver Design (Rev. 0)7/26/2006
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
AN-543: High Quality, All-Digital RF Frequency Modulation Generation with the ADSP-2181 and the AD9850 DDS9/12/2002
• AN-543 - Monaural FM Transmitter
• AN-543 - Stereo FM Transmitter
Multichannel DDS Enables Phase-Coherent FSK Modulation11/1/2010 Analog Dialogue
Video Portables and Cameras Get HDMI Outputs4/13/2007
Improved DDS Devices Enable Advanced Comm Systems9/1/2006
ADI Buys Korean Mobile TV Chip Maker6/7/2006
The Year of the Waveform Generator12/1/2005
Synchronized Synthesizers Aid Multichannel Systems9/20/2005
Direct Digital Synthesis (DDS) Controls Waveforms in Test, Measurement, and Communications8/1/2005 Analog Dialogue
DDS IC Initiates Synchronized Signals7/20/2005
Digital Waveform Generator Provides Flexible Frequency Tuning for Sensor Measurement12/7/2004
DDS Simplifies Polar Modulation8/5/2004
Integrated DDS Chip Takes Steps To 2.7 GHz4/28/2004
Speedy A/Ds Demand Stable Clocks3/22/2004
DDS IC Plus Frequency-To-Voltage Converter Make Low-Cost DAC2/5/2004
Simple Circuit Controls Stepper Motors1/8/2004
Two DDS ICs Implement Amplitude-shift Keying12/25/2003
DDS Circuit Generates Precise PWM Waveforms10/2/2003
DDS Device Produces Sawtooth Waveform7/10/2003
400-MSample DDSs Run On Only +1.8 VDC12/1/2002
Digital Potentiometers Vary Amplitude In DDS Devices5/29/2000
DDS Device Provides Amplitude Modulation9/2/1999
Basics of Designing a Digital Radio Receiver (Radio 101)3/6/1998
Tools & Simulations
AD9959 IBIS Models
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.
Reference Designs (1)
CN0186Phase Coherent FSK Modulator
CN0186Phase Coherent FSK Modulator
Features & Benefits
- Switch frequencies without losing phase information
- Precision tuning range with digital programming
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|
|AD9959BCPZ||Material Declaration||Reliability Data||56-Lead LFCSP (8mm x 8mm)|
|AD9959BCPZ-REEL7||Material Declaration||Reliability Data||56-Lead LFCSP (8mm x 8mm)|
|Wafer Fabrication Data|
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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.