Series CCP-37S
Miniature DC–3 GHz
Low PIM Latching TRANSFER Coaxial Switch
COAX SWITCHES
GLOSSARY
Actuator
input and ending with the completion of the switch transfer,
An actuator is the electromechanical mechanism that including contact bounce. It consists of three parts: (1)
transfers the RF contacts from one position to another upon inductive delay in the coil, (2) transfer time of the physical
DC command.
movement of the contacts, and (3) the bounce time of the
RF contacts.
Arc Suppression Diode
A diode is connected in parallel with the coil. This diode TTL Switch Driver Option
limits the “reverse EMF spike” generated when the coil de- As a special option, switch drivers can be provided for both
energizes to 0.7 volts. The diode cathode is connected to failsafe and latching switches, which are compatible with
the positive side of the coil and the anode is connected to industry-standard low-power Schottky TTL circuits.
the negative side.
Performance Parameters vs Frequency
Date Code
Generally speaking, the RF performance of coaxial switches
All switches are marked with either a unique serial number is frequency dependent. With increasing frequency, VSWR
or a date code. Date codes are in accordance with MIL- and insertion loss increase while isolation decreases. All
STD-1285 Paragraph 5.2.5 and consist of four digits. data sheets specify these three parameters as “worst case”
The first two digits define the year and the last two digits at the highest operating frequency. If the switch is to be
define the week of the year (YYWW). Thus, 1032 identifies used over a narrow frequency band, better performance
switches that passed through final inspection during the can be achieved.
32nd week of 2010.
Actuator Current vs Temperature
Latching
The resistance of the actuator coil varies as a function of
A latching switch remains in the selected position whether temperature. There is an inverse relationship between the
or not voltage is maintained. This can be accomplished operating temperature of the switch and the actuator drive
with either a magnetic or mechanical latching mechanism.
current. For switches operating at 28 VDC, the approximate
actuator drive current at temperature, T, can be calculated
using the equation:
Indicator
I
A
Indicators tell the system which position the switch is in.
Other names for indicators are telemetry contacts or tellback
circuit. Indicators are usually a set of internally mounted DC
contacts linked to the actuator. They can be wired to digital
input lines, status lights, or interlocks. Unless otherwise
specified, the maximum indicator contact rating is 30 Vdc,
50 mA, or 1.5 Watts into a resistive load.
I
=
T
[1 + .00385 (T-20)]
Where:
I
I
=
=
Actuator current at temperature, T
T
Room temperature actuator current –
see data sheet
A
Isolation
T
=
Temperature of interest in °C
Isolation is the measure of the power level at the output
connector of an unconnected RF channel as referenced to Magnetic Sensitivity
the power at the input connector. It is specified in dB below An electro-mechanical switch can be sensitive to ferrous
the input power level.
materials and external magnetic fields. Neighboring ferrous
materials should be permitted no closer than 0.5 inches and
adjacent external magnetic fields should be limited to a flux
Self-Cutoff
The self-cutoff option disables the actuator current on density of less than 5 Gauss.
completion of actuation. Either a series contact (linked
to the actuator) or an IC driver circuit provides the current
cutoff. This option results in minimum power consumption
by the RF switch. Cutthroat is another name used in the
industry for this option. Pulse latching is a term used to
describe a switch without this feature.
TRANSFER Switch
A four-port switch consisting of two independent pairs of
RF paths. These pairs are actuated simultaneously. This
actuation is similar to that of a double-pole double-throw
switch.
Switching Time
Switching time is the total interval beginning with the arrival
of the leading edge of the command pulse at the switch DC
© 2013 TELEDYNE RELAYS
(800) 284-7007 • www.teledynecoax.com
CCP-37S Page 5
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