Features and Benefits
- Low phase noise, phase-locked loop (PLL)
- On-chip VCO tunes from 2.53 GHz to 2.95 GHz
- Optional external 3.3 V/5 V VCO/VCXO to 2.4 GHz
- 1 differential or 2 single-ended reference inputs
- Accepts CMOS, LVDS, or LVPECL references to 250 MHz
- Accepts 16.62 MHz to 33.3 MHz crystal for reference input
- Optional reference clock doubler
- Reference monitoring capability
- Automatic/manual reference holdover and reference switchover modes, with revertive switching
- Glitch-free switchover between references
- Automatic recovery from holdover
- Digital or analog lock detect, selectable
- Optional zero delay operation
- Twelve 1.6 GHz LVPECL outputs divided into 4 groups
- Each group of 3 outputs shares a 1-to-32 divider with phase delay
- Additive output jitter as low as 225 fs rms
- Channel-to-channel skew grouped outputs < 16 ps
- Each LVPECL output can be configured as 2 CMOS outputs (for fOUT ≤ 250 MHz)
- Automatic synchronization of all outputs on power-up
- Manual output synchronization available
- SPI- and I2C-compatible serial control port
- 64-lead LFCSP
- Nonvolatile EEPROM stores configuration settings
The AD9520-0 provides a multi-output clock distribution function with sub-picosecond jitter performance, along with an on-chip PLL and VCO. The on-chip VCO tunes from 2.53 GHz to 2.95 GHz. An external 3.3 V/5 V VCO/VCXO of up to 2.4 GHz can also be used.
The AD9520-0 serial interface supports both SPI and I2C ports. An in-package EEPROM, which can be programmed through the serial interface, can store user-defined register settings for power-up and chip reset.
The AD9520-0 features 12 LVPECL outputs in four groups. Any of the 1.6 GHz LVPECL outputs can be reconfigured as two 250 MHz CMOS outputs. If an application requires LVDS drivers instead of LVPECL drivers, refer to the AD9522-0.
Each group of three outputs has a divider that allows both the divide ratio (from 1 to 32) and the phase offset or coarse time delay to be set.
The AD9520-0 is available in a 64-lead LFCSP and can be operated from a single 3.3 V supply. The external VCO can have an operating voltage of up to 5.5 V. A separate output driver power supply can be from 2.375 V to 3.465 V.
The AD9520-0 is specified for operation over the standard industrial range of −40°C to +85°C.
- Low jitter, low phase noise clock distribution
- Clock generation and translation for SONET, 10Ge, 10GFC, Synchronous Ethernet, OTU2/3/4
- Forward error correction (G.710)
- Clocking high speed ADCs, DACs, DDSs, DDCs, DUCs, MxFEs
- High performance wireless transceivers
- ATE and high performance instrumentation
- Broadband infrastructures
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 AD9520-x (hereafter referred to as AD9520) is a very low noise PLL clock synthesizer featuring an integrated VCO, clock dividers, and up to 24 outputs. The AD9520 features automatic holdover and a flexible reference input circuit allowing for very smooth reference clock switching. The AD9520 family also features the necessary provisions for an external VCXO.
The AD9520 evaluation board is a compact, easy-to-use platform for evaluating all features of the AD9520.
Features & Benefits
- Simple power connection using 6 V wall adapter and on-board LDO voltage regulators
- LDOs are easily bypassed for power measurements
- 5 ac-coupled differential LVPECL SMA connectors
- 7 LVPECL differential headers for additional outputs
- SMA connectors for
2 reference inputs
Charge pump output
Clock distribution input
- USB connection to PC
- Microsoft Windows-based evaluation software with simple graphical user interface
- On-board PLL loop filter
- Easy access to digital I/O and diagnostic signals via
- I/O header
- Status LEDs for diagnostic signals
Documentation & Resources
CN-0186: Phase Coherent FSK Modulator1/11/2011
Resolution vs. ENOB – Still Hazy After All These Years2/1/2013
Considerations on High-Speed Converter PCB Design, Part 4: Plane Coupling2/1/2012
Balancing Phase in High-Speed Converters8/1/2011
Considerations on High-Speed Converter PCB Design, Part 3: The E-Pad Low Down5/1/2011
Considerations on High-Speed Converter PCB Design, Part 2: Power and Ground Planes.2/1/2011
Considerations on High-Speed Converter PCB Design, Part 1: Power and Ground Planes.11/1/2010
Watch for Those Multiple Clocking Edges!8/1/2010
Taming A/D Converter Power Supplies3/1/2010
What’s the (Converter) Frequency Kenneth?9/1/2009
Keeping Common Modes Common4/1/2009
Are Your Filters Filtering?2/1/2009
Multichannel DDS Enables Phase-Coherent FSK Modulation11/1/2010 Analog Dialogue
Tools & Simulations
AD9520-x IBIS Models
ADIsimCLK is the design tool developed specifically for Analog Devices' range of ultra-low jitter clock distribution and clock generation products. Whether your application is in wireless infrastructure, instrumentation, networking, broadband, ATE or other areas demanding predictable clock performance, ADIsimCLK will enable you to rapidly develop, evaluate and optimize your design.
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.
Sample & Buy
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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.