CCRT-40K60-R datasheet(5/5 Pages) TELEDYNE

5 / 5 page

SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE

Page 5

CCRT-40\CRT-40\032023

Series CCRT-40/CRT-40

DC–40 GHz, Terminated

Latching SPDT Coaxial Switch

COAX SWITCHES

+1 (800) 284-7007 • www.teledynerelays.com

Actuator

An actuator is the electromechanical

mechanism that transfers the RF

contacts from one position to another

upon DC command.

Arc Suppression Diode

A diode is connected in parallel with

the coil. This diode limits the “reverse

EMF spike” generated when the coil

de-energizes to 0.7 volts. The diode

cathode is connected to the positive

side of the coil and the anode is

connected to the negative side.

Date Code

All switches are marked with either a

unique serial number or a date code.

Date codes are in accordance with

MIL-STD-1285 Paragraph 5.2.5 and

consist of four digits. 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.

Fail-safe

A fail-safe switch reverts to the default

or fail-safe 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).

Latching

A latching switch remains in the

selected position whether or not

voltage is maintained. This can be

accomplished with either a magnetic or

mechanical latching mechanism.

Indicator

Indicators tell the system which

position the switch is in. Other names

for indicators are telemetry contacts or

tell back 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.

Internal Termination

Unselected

ports

are

internally

terminated to a matched load. The load

is 50Ω resistive device. The max RF

power rating is 2 Watts CW. Without

the internal termination option, the

unselected ports are open circuits.

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.

Self-Cutoff

The self-cutoff option disables the

actuator current on 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.

SPDT Switch

A single-pole-double-throw, has one

input and two output ports.

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 fail-safe

and latching switches, which are

compatible with industry-standard low-

power Schottky TTL circuits.

Performance Parameters vs

Frequency

Generally

speaking,

the

performance of coaxial switches is

frequency dependent. With increasing

frequency, VSWR 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 used over a narrow

frequency band, better performance

can be achieved.

Actuator Current vs Temperature

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

current. For switches operating at 28

VDC, the approximate actuator drive

current at temperature, T, can be

calculated using the equation:

Magnetic Sensitivity

An electromechanical switch can be

sensitive to ferrous 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 density of less than 5

Gauss.

GLOSSARY

[1 + .00385 (T-20)]

Where:

T = Actuator current at temperature, T

A = Room temperature actuator current –

see data sheet

T = Temperature of interest in °C

T =

CCRT-40K60-R 数据表(PDF) 5 Page - Teledyne Technologies Incorporated

CCRT-40K60-R 数据表(HTML) 5 Page - Teledyne Technologies Incorporated

Html Pages

1 2 3 4 5

数据表下载