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Overview
Features and Benefits
- Single, low phase noise, fully integrated VCO/fractional-N PLL core
- VCO range: 2375 MHz to 2725 MHz
- Integrated loop filter (requires a single external capacitor)
- 2 differential, XTAL, or single-ended reference inputs
- Reference monitoring capability
- Automatic redundant XTAL switchover
- Minimal transient, smooth switching
- Typical RMS jitter
- <0.3 ps (12 kHz to 20 MHz), integer-N translations
- <0.5 ps (12 kHz to 20 MHz), fractional-N translations
- Input frequency
- 8 kHz, 1.544 MHz, 2.048 MHz, and 10 MHz to 325 MHz
- Preset frequency translations via pin strapping (PPRx)
- Using a 25 MHz input reference
- 24.576 MHz, 25 MHz, 33.33 MHz, 50 MHz, 70.656 MHz, 100 MHz, 125 MHz, 148.5 MHz, 156.25 MHz, 161.1328 MHz, 312.5 MHz, 322.2656 MHz, 625 MHz, or 644.5313 MHz
- Using a 19.44 MHz input reference
- 50 MHz, 100 MHz, 125 MHz, 156.25 MHz, 161.1328 MHz, or 644.5313 MHz
- Using a 30.72 MHz input reference
- 25 MHz, 50 MHz, 100 MHz, 125 MHz, or 156.25 MHz
- Using a 25 MHz input reference
- Single, general-purpose, fully integrated VCO/integer-N PLL core
- VCO range: 750 MHz to 825 MHz
- Integrated loop filter
- Independent, duplicate reference input or operation from the fractional-N PLL active reference input
- Input frequency: 25 MHz
- Preset frequency translations via pin strapping (PPRx)
- 25 MHz, 33.33 MHz, 50 MHz, 66.67 MHz, 100 MHz, 133.33 MHz, 200 MHz, or 400 MHz
- Up to 3 copies of reference clock output
- 11 pairs of configurable differential outputs
- Output drive formats
- 3 outputs: HSTL, LVDS, HCSL, 1.8 V CMOS, 2.5 V/3.3 V CMOS
- 8 outputs: HSTL, LVDS, or 1.8 V CMOS
- 2.5 V or 3.3 V single-supply operation
Product Details
The AD9576 provides a multiple output clock generator function comprising two dedicated phase-locked loop (PLL) cores with flexible frequency translation capability, optimized to serve as a robust source of asynchronous clocks for an entire system, providing extended operating life within frequency tolerance through monitoring of and automatic switchover between redundant crystal (XTAL) inputs with minimized switching, induced transients. The fractional-N PLL design is based on the Analog Devices, Inc., proven portfolio of high performance, low jitter frequency synthesizers to maximize network performance, whereas the integer-N PLL provides general-purpose clocks for use as CPU and field-programmable gate array (FPGA) reference clocks.
The AD9576 uses pin strapping to select among a multitude of power-on ready configurations for its 11 output clocks, which require only the connection of external pull-up or pull-down resistors to the appropriate pin program reader pins (PPRx). These pins provide control of the internal dividers for establishing the desired frequency translations, clock output functionality, and input reference functionality. These parameters can also be manually configured through a serial port interface (SPI).
The AD9576 is packaged in a 64-lead, 9 mm × 9 mm LFCSP, requiring only a single 2.5 V or 3.3 V supply. The operating temperature range is −40°C to +85°C.
Each OUTx output is differential and contains two pins: OUTx and OUTx. For simplicity, the term OUTx refers to the functional output block containing these two pins..
Applications
- Ethernet line cards, switches, and routers
- Baseband units
- SATA and PCI express
- Low jitter, low phase noise clock generation
- Asynchronous clock generation
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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.
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Evaluation Boards
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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.