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

The AD8108/AD8109 are high speed 8 × 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 (at 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 and AD8109 include eight independent output buffers that can be placed into a high impedance state for paralleling crosspoint outputs so that off channels do not load the output bus. The AD8108 has a gain of 1, while the AD8109 offers a gain of 2. They operate on voltage supplies of ±5 V while consuming only 45 mA of idle current. The channel switching is performed via a serial digital control (which can accommodate daisy-chaining of several devices) or via a parallel control allowing updating of an individual output without reprogramming the entire array.

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

Applications

Features and Benefits
  • 8 × 8 high speed nonblocking switch arrays: G = 1
  • Serial or parallel programming of switch array
  • Serial data out allows daisy-chaining of multiple 8 × 8 arrays to create larger switch arrays
  • Output disable allows connection of multiple devices
  • Pin-compatible with AD8110/AD8111 16 × 8 switch arrays
  • For 16 × 16 arrays see AD8116
  • Complete solution
    • Buffered inputs
    • Eight output amplifiers: G = 1
    • Drives 150 Ω loads
  • Buffered inputs
  • Eight output amplifiers: 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 (RL = 150 Ω)
  • 60 MHz 0.1 dB gain flatness
  • 0.02%/0.02° differential gain/differential phase error (RL = 150 Ω)
  • Excellent ac performance
    • −3 dB bandwidth: 325 MHz
    • Slew rate: 400 V/µs
  • −3 dB bandwidth: 325 MHz
  • Slew rate: 400 V/µs
  • Low power of 45 mA
  • Low all hostile crosstalk of −83 dB at 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
  • 80-lead LQFP (12 mm × 12 mm)
  • Switches & Multiplexers
    Data Sheets
    Documentnote
    AD8108/AD8109: 325 MHz, 8 x 8 Buffered Video Crosspoint Switches Data Sheet (Rev. C)PDF 462.27 K
    Application Notes
    Documentnote
    AN-282: Fundamentals of Sampled Data SystemsPDF 2131 kB
    AN-214: Ground Rules for High Speed CircuitsPDF 356 kB
    Order Information
    Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
    AD8108ASTZ Production80 ld LQFP (12x12x1.4mm)OTH 119-40 to 85C23.7820.22Y
    Reference Materials
    AD8108/AD8109: 325 MHz, 8 x 8 Buffered Video Crosspoint Switches Data Sheet (Rev. C) ad8108
    AN-282: Fundamentals of Sampled Data Systems ad1674
    AN-214: Ground Rules for High Speed Circuits ad1674
    AN-282: 采样数据系统基本原理[中文版] (Rev. A) ad75019
    High Speed Switches ad75019
    CMOS Switches Offer High Performance in Low Power, Wideband Applications ad75019