1. Products
  2. Clock and Timing
  3. Clock Generation and Distribution
  4. Clock Distribution Devices
  5. ADH987S


Features and Benefits

  • Ultra Low Noise Floor: -155 dBc/Hz @ 2 GHz
  • LVPECL, LVDS, CML & CMOS Compatible Inputs
  • Up to 8 Differential or 16 Single-Ended LVPECL Outputs
  • One Adjustable Power CML/RF Output
  • Serial or Parallel Control, Hardware Chip-Enable
  • Power-Down Current < 1 µA

Product Details

The ADH987S 1-to-9 fanout buffer is designed for low noise clock distribution. It is intended to generate relatively square wave outputs with fast rise / fall times. The low skew outputs of the ADH987S, combined with its fast rise / fall times, leads to controllable low-noise switching of downstream circuits such as mixers, ADCs / DACs or SERDES devices. The noise floor is particularly important in these applications, when the clock network bandwidth is wide enough to allow squarewave switching. Driven at 2 GHz, outputs of the ADH987S have a noise floor of -155 dBc/Hz.

The input stage can be driven single-ended or differentially, in a variety of signal formats (CML, LVDS, LVPECL or CMOS), AC or DC coupled. The input stage also features adjustable input impedance. It has 8 LVPECL outputs, and 1 CML output with adjustable swing/power-level in 3 dB steps.

Individual output stages may be enabled or disabled for power-savings when not required using either hardware control pins, or under control of a serial-port interface.


  • RF/µW
  • Clock Distribution
  • Clock Fanout
  • LO Distribution

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
ADH987G32-EMX Material Declaration Reliability Data CERPAK(HERM CER SRF MOUNT)
ADH987R701G32 Material Declaration Reliability Data 32-lead FLATPACK_RF
Wafer Fabrication Data

Sample & Buy

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Buy Now Pricing

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List Pricing

(*)The 1Ku 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. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


Lead Times

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