General Information
Keysight
L7222C Coaxial Transfer Switch Operating
and Service Manual
5
•
Select position A by applying TTL “High” to pin 7 and TTL “High” to
pin 8.
•
Select position B by applying TTL “Low” to pin 7 and TTL “High” to
pin 8.
NOTE
After the RF path is switched and latched, the drive current is interrupted by
the electronic position-sensing circuitry. Pulsed control is not necessary, but
if implemented, the pulse witdth must be 15 ms minimum to ensure that the
switch is fully latched.
Dual Line TTL
Drive
•
Connect pin 1 to supply voltage (+20 Vdc to +32 Vdc) and pin 9 to
ground. See
Figure 3
for connection diagram and
Table 3
for TTL drive
control.
NOTE
For TTL drive, pin 9 must be grounded
In addition to the quiescent current supplying the electronic position-sensing
circuitry, the drive current flows out of pin 9 (during switching) when using
TTL drive.
•
Select position A by applying TTL “High” to pin 7 and TTL “Low” to
pin 8.
•
Select position B by applying TTL “Low” to pin 7 and TTL “High” to
pin 8.
NOTE
After the RF path is switched and latched, the drive current is interrupted by
the electronic position-sensing circuitry. Pulsed control is not necessary, but