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AD8158:  6.5 Gbps Quad Buffer Mux/Demux

Product Details

The AD8158 is an asynchronous, protocol-agnostic, quad-lane 2:1 switch with a total of 12 differential CML inputs and 12 differential CML outputs. The signal path supports NRZ signaling with data rates up to 6.5 Gbps per lane. Each lane offers programmable receive equalization, programmable output pre-emphasis, programmable output levels, and loss-of-signal detection.

The nonblocking switch-core of the AD8158 implements a 2:1 multiplexer and 1:2 demultiplexer per lane and supports independent lane switching through the four select pins, SEL[3:0]. Each port is a four-lane link. Every lane implements an asynchronous path supporting dc to 6.5 Gbps NRZ data, fully independent of other lanes. The AD8158 has low latency and very low lane-to-lane skew.

The main application of the AD8158 is to support redundancy on both the backplane and the line interface sides of a serial link. The demultiplexing path implements unicast and bicast capability, allowing the part to support either 1 + 1 or 1:1 redundancy.

The AD8158 is also suited for testing high speed serial links because of its ability to duplicate incoming data. In a port-monitoring application, the AD8158 can maintain link-connectivity with a pass-through connection from Port C to Port A while sending a duplicate copy of the data to test equipment on Port B.

The rich feature set of the AD8158 can be controlled either through external toggle pins or by setting on-chip control registers through the I2C interface.


  • Low cost redundancy switch
  • SONET OC48/SDH16 and lower data rates
  • XAUI/GbE/FC/Infiniband over backplane
  • OIF CEI 6.25 Gbps over backplane
  • Serial data-level shift
  • 4-/8-/12-lane equalizers or redrivers


  • Quad 2:1 mux/1:2 demux
  • Optimized for dc to 6.5 Gbps NRZ data
  • Per-lane P/N pair inversion for routing ease
  • Programmable input equalization
      Compensates up to 40 inches of FR4
  • Loss-of-signal detection
  • Programmable output pre-emphasis up to 12 dB
  • Programmable output levels with squelch and disable
  • See data sheet for additional features

AD8158 Functional Block Diagram


Title Content Type File Type
AD8158: X-stream ™ 6.5 Gbps Quad Buffer Mux/Demux Data Sheet (Rev B, 12/2009) (pdf, 702 kB) Data Sheets PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD8158 Power Calculator  (xls, 35 kB)
This spreadsheet will assist the user in calculating power supply requirements and total device power dissipation.
Design Calculators XLS
AD8158 SPICE Macro Model SPICE Models HTML

Evaluation Kits & Symbols & Footprints

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

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

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Price, packaging, availability

Price Table Help

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.

AD8158 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
AD8158-EVALZ Status: Production Evaluation Board $860.20 Yes - Contact ADI

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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