Datasheet

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34945A/34945EXT microwave switch/attenuator driver
This module allows you to control switches attenuators, and other devices external to the 34980A. The
34945A / 34945EXT provides the power and control signals for many of the most popular microwave
switches and attenuators. One 34945A /34945EXT combination can drive up to 64 switch coils—that’s 32
standard SPDT switches. The 34945A /EXT can be extended by adding additional 34945EXT boards.
The first 34945EXT is powered by the mainframe. You can add up to seven additional 34945EXT boards
with user supplied power. Multiple switch operations are performed in sequential order, or for faster,
simultaneous switching, you can connect an external power supply to the 34945EXT.
The Y1150A-Y1155A distribution boards enable simple connections to the external switches. The
distribution boards plug onto the 34945EXT and are used to route the power and control signals from the
driver module to the switches using standard cables.
The 34945A /34945EXT also has sensing capabilities that allows read back of the actual position of the
switch or attenuator. Drive signals for LED indicators are also provided to give a visual indication of the
switch position.
The following microwave switches and attenuators are supported with the Y1150AY1155A distribution
boards:
• N181x/U9397x series SPDT switches
• 8762/3/4 series SPDT switches (screw terminals)
• 8765x coaxial switches
• 8766x/8767x/8768x multiport switches
• 87104x/106x/L710xx/L720xx multiport switches
• 87406x series matrix switches
• 87204x/206x series multiport switches
• 87606x series matrix switches
• 87222x/L7222 transfer switches
• 849x and 8490x series attenuators
• Other switches and devices through individual screw terminal connections
Figure 16: 34945A/34945EXT