CM-MMCX User Guide: Clock I/O

The CM-MMCX clock module routes external clock signals to MMCX connectors. There are four connectors on the module:

Connector	Signal	WARP v3 Connection
RF Ref Out	RF reference clock output	RF ref clock buffer (U20) CLKOUT0
RF Ref In	RF reference clock Input	RF ref clock buffer (U20) CLKIN2
Samp Out	Sampling clock output	Sampling clock buffer (U46) CLKOUT1
Samp In	Sampling clock Input	Sampling clock buffer (U46) CLKIN2

The frequency of each clock signal will depend on the configuration of the corresponding clock buffer on the host WARP v3 board. Refer to the WARP v3 Clocking user guide for details.

Connectors

The MMCX connectors are standard-polarity, standard-gender 50-ohm MMCX connectors.

The CM-MMCX PCB can be assembled with either MMCX jacks or MMCX plugs, illustrated in the figure below. For connections between WARP v3 kits we recommend CM-MMCX modules with MMCX jacks, which will allow use of readily available cable assemblies with MMCX plugs (like ​Digi-Key J731-ND).