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AD8156:  6.25 Gbps, 4 × 4, Digital Crosspoint Switch with EQ

Product Details

The AD8156, a member of the Xstream line of products, is a high speed, fully differential, digital crosspoint switch. The part can function as a 4 × 4 crosspoint switch with double-latched memory, allowing simultaneous updates, or as a dual 2 × 2 with direct output control. The AD8156 has low power dissipation, typically 700 mW on 3.3 V with all outputs and input equalizers active. It operates at any data rate from dc to 6.25 Gbps per port.

Each input channel on the AD8156 has a programmable input equalizer to compensate for signal loss over a backplane.

The AD8156 high speed inputs are compatible with both ac-coupled and dc-coupled 3.3 V, 2.5 V, or 1.8 V CML, as well as 3.3 V LVPECL data levels. The control interface is LVTTL- and LVCMOS-compatible at 3.3 V. All input and output termination resistors are integrated for ease of layout and to minimize impedance mismatch. Input equalization and unused outputs can be individually disabled to minimize power dissipation.

The AD8156 is packaged in a 49-ball, 8 mm × 8 mm, BGA package with a 1 mm ball pitch. It operates over the industrial temperature range of −40°C to 85°C.


  • Gigabit Ethernet
  • XAUI
  • Fibre Channel


  • 4 × 4, fully differential, nonblocking array
  • Configurable for dual 2 × 2 operation
  • DC to 6.25 Gbps per channel, NRZ data rate
  • Programmable input equalization compensates for over 40” of FR-4 at 6.25 Gbps
  • Multicast and broadcast modes of operation
  • Programmable output swing
    100 mV p-p to 1.6 V p-p differential
  • Power supply: 3.3 V (±10%)
  • Low power
    No EQ: 400 mW typical
    Maximum EQ: 700 mW typical
  • Inputs: ac-coupled or dc-coupled
  • Wide set of dc-coupled input standards
    3.3 V/2.5 V/1.8 V CML or 3.3 V LVPECL
  • Control: LVTTL- or LVCMOS-compatible
  • Low additive jitter: 25 ps p-p typical

Functional Block Diagram for AD8156


Title Content Type File Type
AD8156: XstreamTM 6.25 Gbps, 4 4, Digital Crosspoint Switch with EQ Data Sheet (Rev 0, 05/2007) (pdf, 527 kB) Data Sheets PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

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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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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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