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AD9577:  Clock Generator with Dual PLLs, Spread Spectrum, and Margining

Product Details

Product Status:Recommended for New Designs

The AD9577 provides a multioutput clock generator function along with two on-chip phase-locked loop cores, PLL1 and PLL2, optimized for network clocking applications. The PLL designs are based on Analog Devices, Inc., proven portfolio of high performance, low jitter frequency synthesizers to maximize network performance. The PLLs have I2C programmable output frequencies and formats. The fractional-N PLL can support spread spectrum clocking for reduced EMI radiated peak power. Both PLLs can support frequency margining.

The first integer-N PLL section (PLL1) consists of a phase frequency detector (PFD), a charge pump (CP), a low noise voltage controlled oscillator (VCO), a programmable feedback divider, and two independently programmable output dividers. By connecting an external crystal or reference clock to the REFCLK pin, frequencies up to 637.5 MHz can be synchronized to the input reference. Each output divider and feedback divider ratio can be factory or I2C programmed for the required output rates.

A second fractional-N PLL (PLL2) with a programmable modulus allows VCO frequencies that are fractional multiples of the reference frequency to be synthesized. Each output divider and feedback divider ratio can be factory programmed for the required output rates, up to 637.5 MHz. This fractional-N PLL can also operate in integer-N mode for the lowest jitter.

Up to four differential output clock signals can be configured as either LVPECL or LVDS signaling formats. Alternatively, each output pair can be configured for up to eight CMOS outputs. Combinations of these formats are supported. No external loop filter components are required, thus conserving valuable design time and board space. The AD9577 is available in a 40-lead, 6 mm × 6 mm LFCSP package and can operate from a single 3.3 V supply. The operating temperature range is −40°C to +85°C.

APPLICATIONS

  • Low jitter, low phase noise multi-output clock generator for data communications applications including Ethernet, Fibre Channel, SONET, SDH, PCI-e, SATA, PTN, OTN, ADC/DAC, and digital video
  • Spread spectrum clocking

FEATURES and BENEFITS

  • Fully integrated dual PLL/VCO cores
  • 1 integer-N and 1 fractional-N PLL
  • Continuous frequency coverage from 11.2 MHz to 200 MHz
    -- Most frequencies from 200 MHz to 637.5 MHz available
  • PLL1 phase jitter
    (12 kHz to 20 MHz):
    460 fs rms typical
  • PLL2 phase jitter (12 kHz to 20 MHz)
    - Integer-N mode: 470 fs rms typical
    - Fractional-N mode: 660 fs rms typical
  • Input crystal or reference clock frequency
  • Spread spectrum: downspread [0, −0.5]%
  • 2 pin controlled frequency maps: margining
  • Integrated loop filters
  • See datasheet for additional features

Functional Block Diagram for AD9577

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.

Product Recommendations & Reference Designs

Companion Products

Suggested Companion Products


Recommended Clock Drivers for the AD9577

Recommended Linear Regulator for the AD9577
  • For a low noise, low dropout, high output current, we recommend the ADP7104.
Recommended Switching Controller for the AD9577
  • For a versatile and synchronous PWM buck controller, we recommend the ADP1828.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD9577 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD9577BCPZ Status: Production 40 ld LFCSP (6x6mm w/4.6mm pad) 40 Ind Tray, 490 $5.10 $4.34 Y  Material Info PCN Purchase Sample
AD9577BCPZ-R7 Status: Production 40 ld LFCSP (6x6mm w/4.6mm pad) 40 Ind Reel, 750 $5.10 $4.34 Y  Material Info PCN Purchase Sample
AD9577BCPZ-RL Status: Production 40 ld LFCSP (6x6mm w/4.6mm pad) 40 Ind Reel, 2500 - $4.34 Y  Material Info PCN Purchase
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.

AD9577 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD9577-EVALZ Status: Production Evaluation Board $581.90 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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