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AD8108:  325 MHz, 8 x 8 Buffered Video Crosspoint Switch (Gain = 1)

Product Details

The AD8108/AD8109 are high speed 8 x 8 video crosspoint switch matrices. They offer a –3 dB signal bandwidth greater than 250 MHz and channel switch times of less than 25 ns with 1% settling. With –83 dB of crosstalk and –98 dB isolation (@ 5 MHz), the AD8108/AD8109 are useful in many high speed applications. The differential gain and differential phase of better than 0.02% and 0.02°, respectively, along with 0.1 dB flatness out to 60 MHz, make the AD8108/AD8109 ideal for video signal switching.

The AD8108/AD8109 is packaged in an 80-lead LQFP package and is available over the extended industrial temperature range of -40°C to +85°C.

An evaluation board is available for this product and may be ordered using the following product number: AD8108-EB and AD8109-EB. Schematic and layout for this evaluation board is contained in the product datasheet.


  • 8 x 8 High-speed nonblocking switch arrays
    AD8108: G = 1
    AD8109: G = 2
  • Serial or parallel programming of switch array
  • Serial data out allows daisy-chaining of multiple 8 x 8 arrays to create larger switch arrays
  • Output disable allows connection of multiple devices
  • Pin-compatible with AD8110/AD8111 16 x 8 switch arrays
    For 16 x 16 arrays see AD8116
  • Complete solution
    Buffered inputs
    Eight output amplifiers, AD8108 (G = 1)
    Drives 150 Ω loads
  • Excellent video performance
    60 MHz 0.1 dB gain flatness
    0.02%/0.02° differential gain/differential
    phase error
  • Excellent ac performance
    -3 dB bandwidth: 325 MHz (8108), 250 MHz (AD8109)
    Slew rate: 400 V/µs (AD8108), 480 V/µs (AD8109)
  • Low power of 45 mA
  • Low all hostile crosstalk of -83 dB @ 5 MHz
  • Reset pin allows disabling of all outputs (connected through a capacitor to ground provides power-on reset capability)
  • Excellent ESD rating: exceeds 4000 V human body model

Functional Block Diagram for AD8108


Title Content Type File Type
AD8108/AD8109: 325 MHz, 8 x 8 Buffered Video Crosspoint Switches Data Sheet (Rev B, 03/2011) (pdf, 972 kB) Data Sheets PDF
AN-282: Fundamentals of Sampled Data Systems  (pdf, 2131 kB) Application Notes PDF
AN-214: Ground Rules for High Speed Circuits  (pdf, 356 kB)
Layout and Wiring Are Critical in Video Converter Circuits.
Application Notes PDF
Data-acquisition system uses fault protection
By Catherine Redmond, Analog Devices, Inc. (EDN, 4/15/2004)
Technical Articles HTML
CMOS Switches Offer High Performance in Low Power, Wideband Applications  (pdf, 320 kB)
by Theresa Corrigan and Ray Goggin, Analog Devices, Inc. (High Frequency Electronics, February 2004)
Technical Articles PDF
Enhanced Multiplexing for MEMS Optical Cross Connects
by James Caffrey (Fiberoptic Product News, 8/2003)
Technical Articles HTML
High Speed Switches  (pdf, 63 kB) Product Selection Guide PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

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Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

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Price, packaging, availability

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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.

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