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CCRT-33S6E-D Datasheet(PDF) 7 Page - Teledyne Technologies Incorporated |
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CCRT-33S6E-D Datasheet(HTML) 7 Page - Teledyne Technologies Incorporated |
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7 / 8 page  © 2013 TELEDYNE RELAYS (800) 284-7007 • www.teledynecoax.com CCRT-33S/CRT-33S Page 7 CCRT-33S\CRT-33S\082013\Q3 Series CCRT-33S/CRT-33S Internal 50 Ω Termination DC–18 GHz/DC-22 GHz Latching SPDT Coaxial Switch COAX SWITCHES 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. 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 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. 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, bi-directional switch that can be used as having one input and two outputs or two inputs and one output. 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. Performance Parameters vs Frequency Generally speaking, the RF 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 electro-mechanical 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 I A [1 + .00385 (T-20)] Where: I T = Actuator current at temperature, T I A = Room temperature actuator current – see data sheet T = Temperature of interest in °C I T = Carrier Frequency 1 Carrier Frequency 2 PIM 3rd Order Frequency PIM 5th Order Fre- quency 870 MHz 893 MHz 847 MHz 824 MHz 3rd Order Intermodulation 5th Order Intermodulation SPDT –91 dBm –110 dBm –134 dBc –153 dBc SPECIAL FEATURE Switching High-Power or Highly Sensitive Signals Ensure the most linear response with the best galvanically matched contact system in the industry. Extremely low passive intermodulation is standard on all of our switches. |
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Similar Description - CCRT-33S6E-D |
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