Series CCRS-33S/CRS-33S
Miniature DC–18 GHz
COAX SWITCHES
Failsafe 2P3T Coaxial Switch
GLOSSARY
Actuator
Performance Parameters vs Frequency
An actuator is the electromechanical mechanism that Generally speaking, the RF performance of coaxial switches
transfers the RF contacts from one position to another upon is frequency dependent. With increasing frequency, VSWR
DC command.
and insertion loss increase while isolation decreases. All
data sheets specify these three parameters as “worst case”
at the highest operating frequency. If the switch is to be
Arc Suppression Diode
A diode is connected in parallel with the coil. This diode used over a narrow frequency band, better performance
limits the “reverse EMF spike” generated when the coil de- can be achieved.
energizes to 0.7 volts. The diode cathode is connected to
the positive side of the coil and the anode is connected to Actuator Current vs Temperature
the negative side.
The resistance of the actuator coil varies as a function of
temperature. There is an inverse relationship between the
operating temperature of the switch and the actuator drive
Date Code
All switches are marked with either a unique serial number current. For switches operating at 28 VDC, the approximate
or a date code. Date codes are in accordance with MIL- actuator drive current at temperature, T, can be calculated
STD-1285 Paragraph 5.2.5 and consist of four digits. using the equation:
The first two digits define the year and the last two digits
define the week of the year (YYWW). Thus, 1032 identifies
switches that passed through final inspection during the
32nd week of 2010.
I
A
I
=
T
[1 + .00385 (T-20)]
Where:
Failsafe
A failsafe switch reverts to the default or failsafe position
when actuating voltage is removed. This is realized by a
return spring within the drive mechanism. This type of switch
requires the continuous application of operating voltage to
select and hold any position. (Multi-position switches are
normally open with no voltage applied).
I
I
=
=
Actuator current at temperature, T
T
Room temperature actuator current –
see data sheet
A
T
=
Temperature of interest in °C
Indicator
Magnetic Sensitivity
Indicators tell the system which position the switch is in. An electro-mechanical switch can be sensitive to ferrous
Other names for indicators are telemetry contacts or tellback materials and external magnetic fields. Neighboring ferrous
circuit. Indicators are usually a set of internally mounted DC materials should be permitted no closer than 0.5 inches and
contacts linked to the actuator. They can be wired to digital adjacent external magnetic fields should be limited to a flux
input lines, status lights, or interlocks. Unless otherwise density of less than 5 Gauss.
specified, the maximum indicator contact rating is 30 Vdc,
50 mA, or 1.5 Watts into a resistive load.
Isolation
Isolation is the measure of the power level at the output
connector of an unconnected RF channel as referenced to
the power at the input connector. It is specified in dB below
the input power level.
Switching Time
Switching time is the total interval beginning with the arrival
of the leading edge of the command pulse at the switch DC
input and ending with the completion of the switch transfer,
including contact bounce. It consists of three parts: (1)
inductive delay in the coil, (2) transfer time of the physical
movement of the contacts, and (3) the bounce time of the
RF contacts.
TTL Switch Driver Option
As a special option, switch drivers can be provided for both
failsafe and latching switches, which are compatible with
industry-standard low-power Schottky TTL circuits.
© 2012 TELEDYNE RELAYS
(800) 284-7007 • www.teledynecoax.com
CCRS-33S/CRS-33S Page 7
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