Medium-Speed Clocking Module – Low-Pin-Countfmc406web

The FMC406 is a low-noise clock generation and distribution module with eight clock outputs and eight trigger outputs that are fully synchronized. This module can either distribute an externally supplied clock or a locally generated clock. In the standard configuration, the FMC406 can generate any clock frequency between 34.375 MHz and 250MHz and lock it to an internal or external reference. The maximum clock frequency can be extended to 350MHz as a build option.

A synchronous trigger signal received from the FMC connector is distributed to the eight trigger outputs. Additionally, an external trigger signal can be synchronized to the output clocks and distributed on the eight trigger outputs. Alternatively, it is also possible to distribute the external 1PPS or locally generated 1PPS signal for data time stamping. The FMC406 is recommended for applications that require synchronous A/D or D/A sampling across multiple cards or systems. With a low-pin count connector and front panel I/O, this module can be used in a conduction-cooled environment.

fmc116_connectorThe design is based on Analog Devices’ ADF4351 PLL synthesizer in combination with the Cypress Semiconductor CY29948AXI LVCMOS fan-out buffer. The fan-out buffer outputs eight phase-aligned, low-noise clocks generated from either the external or internal clocks. A GPS module, the LINX RXM-GPS-F4-T, provides the 1PPS signal for clock and trigger synchronization. The FMC406 daughter card is mechanically and electrically compliant with the FMC standard (ANSI/VITA 57.1).



  • External clock input and onboard VCO
  • External reference input and on board reference (30.72MHz)
  • External 1PPS, Sync and Trigger inputs
  • Eight synchronized clock outputs (34.375MHz-250MHz)
  • Eight synchronized trigger or 1PPS outputs
  • Onboard GPS receiver for accurate data time stamping
  • Fully controllable from FMC connector
  • VITA 57.1-2010 compliant
  • LPC (Low-Pin Count) 160-Pin Connector
  • Mil-I-46058c Conformal Coating Compliant – Optional
  • A breakout cable on the front panel makes all clock and trigger signals available on individual SMA sockets.

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