Agilent Technologies U2121A-101 RF Operating Manual page 30

20
Pulse drive
Pulse drive method controls the switches using a ~30 ms pulse. As
shown in the figure below, the control signal is applied to one of the
control bit and held for the preset time.
Output
enable
Drive ChA
Drive ChB
General IO
There are three digital outputs and three digital inputs available in
the U2121A- 101 as an auxiliary port. These three output pins are
capable to drive up to 300 mA of load. The digital input pin has a
direct connection to the U2121A.
Controlled supply
From U2121A DO
Output circuit
Drive active
Output
Input
Drive active
To U2121A DI
Input circuit
U2121A-101 Operating Guide