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45 Gbps Fanout Buffer with Programmable Output Voltage

Product Details

Data Sheet
Package Layout
Tape & Reel

Quality & Reliability

Environmental Data Sheet
Qualification Test Reports

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Product Press Release

Life Cycle Status

Production, Recommended for New Designs

Data / Clock Rate (Gbps/GHz) Function Rise / Fall Time (ps) Differential Output Swing (Vp-p) DC Power Consumption (mW) DC Power Supply (Vdc) Package
45 / 28 1:2 Fanout Buffer w/ Adj. Vout 11 / 11 0.4 - 1.2 465 -3.3 LC4B


• Supports Clock Frequencies
   up to 28 GHz
• Independent Programmable
   Output Swing for
   Each Channel: 400 - 1200 mVp-p Diff.
• Single-Ended or Differential Operation
• Power Consumption: 465 mW
• Less than 500 fs Additive RMS Jitter
• Fast Rise and Fall Times: <12 ps
• 24 Lead 4x4mm SMT Package: 16mm²

Typical Applications

• OC-768 & SDH STM-256 Equipment
• RF ATE Applications
• Short, intermediate, & Long Haul
   Fiber Optic Applications
• Broadband Test & Measurement
• Serial Data Transmission
   up to 45 Gbps
• Clock Buffering up to 28 GHz


Functional Diagram

HMC842LC4B Functional Diagram

General Description

The HMC842LC4B is a 1:2 Fanout Buffer designed to support data transmission rates up to 45 Gbps. The device can also operate with clock signals up to 28 GHz. During normal operation, input data (or clock) is transferred to both output channels. Differential input and output signals of the HMC842LC4B are terminated with 50 Ohms to ground on-chip, and may be either AC or DC coupled. The Outputs can be connected directly to a 50 Ohms-to-ground terminated system, while DC blocking capacitors should be used if the terminating system is 50 Ohms to a non-ground DC voltage.

The HMC842LC4B also features two separate output level control pins, VAC1 and VAC2 which provide loss compensation and signal level optimization for each output channel independently. The HMC842LC4B operates from a single -3.3V DC supply and is available in a ceramic RoHS compliant 4x4 mm SMT package.