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  2. Clock and Timing
  3. Clock Generation and Distribution
  4. Clock Distribution Devices
  5. AD9508


Features and Benefits

  • 1.65 GHz differential clock inputs/outputs
  • 10-bit programmable dividers, 1 to 1024, all integers
  • Up to 4 differential outputs or 8 CMOS outputs
  • Pin strapping capability for hardwired programming at power-up
  • <115 fs rms broadband random jitter
  • Additive output jitter: 41 fs rms typical (12 kHz to 20 MHz)
  • Excellent output-to-output isolation
  • Automatic synchronization of all outputs
  • Single 2.5 V/3.3 V power supply
  • Internal LDO (low drop-out) voltage regulator for enhanced power supply immunity
  • Phase offset select for output-to-output coarse delay adjust
  • 3 programmable output logic levels, LVDS, HSTL, and CMOS
  • Serial control port (SPI/I2C) or pin-programmable mode
  • Space-saving 24-lead LFCSP
AD9508-EP supports defense and aerospace applications (AQEC standard)
  • Download AD9508-EP data sheet (pdf)
  • Extended temperature range: −55°C to +105°C
  • Controlled manufacturing baseline
  • One assembly/test site
  • One fabrication site
  • Enhanced product change notification
  • Qualification data available on request
  • V62/13626 DSCC Drawing Number

Product Details

The AD9508 provides clock fanout capability in a design that emphasizes low jitter to maximize system performance. This device benefits applications like clocking data converters with demanding phase noise and low jitter requirements.

There are four independent differential clock outputs, each with various types of logic levels available. Available logic types include LVDS (1.65 GHz), HSTL (1.65 GHz), and 1.8 V CMOS (250 MHz). In 1.8 V CMOS output mode, the differential output becomes two CMOS single-ended signals. The CMOS outputs are 1.8 V logic levels, regardless of the operating supply voltage.

Each output has a programmable divider that can be bypassed or be set to divide by any integer up to 1024. In addition, the AD9508 supports a coarse output phase adjustment between the outputs.

The device can also be pin programmed for various fixed configurations at power-up without the need for SPI or I2C programming.

The AD9508 is available in a 24-lead LFCSP and operates from a either a single 2.5 V or 3.3 V supply. The temperature range is −40°C to +85°C.


  • Low jitter, low phase noise clock distribution
  • Clocking high speed ADCs, DACs, DDSs, DDCs, DUCs, MxFEs
  • High performance wireless transceivers
  • High performance instrumentation
  • Broadband infrastructure

Product Lifecycle icon-recommended 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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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
AD9508BCPZ Material Declaration Reliability Data 24-Lead LFCSP (4mm x 5mm w/ EP)
AD9508BCPZ-REEL7 Material Declaration Reliability Data 24-Lead LFCSP (4mm x 5mm w/ EP)
AD9508SCPZ-EP Material Declaration Reliability Data 24-Lead LFCSP (4mm x 4mm w/ EP)
AD9508SCPZ-EP-R7 Material Declaration Reliability Data 24-Lead LFCSP (4mm x 4mm w/ EP)
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.