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DDF11 Datasheet(PDF) 6 Page - API Technologies Corp |
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DDF11 Datasheet(HTML) 6 Page - API Technologies Corp |
6 / 6 page DD320 DD350 DD420 DD450 DD620 DD650 Three, Four, and Six Channel High Current Drivers M ultiple independent medium speed drivers w ith separate input logic mode controls. Logic inputs are true TTL unit loads. 1. Inputs are inverting w hen M ode control has a logic high input. 2. Inputs are non-inverting w hen M ode control has a logic low input. 3. M ode control and input pins are interchangeable w ithin any one channel. 4. The negative output current does not vary w ith \/ee w hich should not exceed -5V w hen driving grounded anode diodes to avoid high pow er dissi- pation in the drivers. 5. The last tw o digits of the part number signif y out- put current. Other currents are available on special order. APPLICATION NOTES PIN Diode Sw itching Times PIN diodes are used as RF sw itches because of their low of f -capacitance/on-resistance product. How ever, they store a signif icant charge during conduction that must be removed bef ore they w ill turn of f . Typically, this is specif ied as storage time (TS), w hich is made to look better than it might be by rating it w ith a high ratio of reverse (IR) to f orw ard (IF) current. W hen sw itching these diodes w ith a non-spiking driver, the typical TS w ill be multiplied by the specif ied ratio. For example, the M A 47120 has a TS of 12 ns w ith IF=20 mA and IR= 200 mA . W ith symmetrical currents as delivered by high current drivers, the TS becomes 120 ns. High speed drivers supply a spike of several hundred mA at turn-on and turn-of f to shorten the TS of the PIN diode. Heat Sinking The pow er dissipated in PIN diode sw itches is conducted to the bottom of the package. The thin walls leading to the top of the package represent a high thermal resistance. The total pow er in the hybrid is the sum of it own current drain multiplied by the voltage of each supply plus the output current of each driver multiplied by the supply voltage less the V F of the PIN diode. The total can be substantial especially in the multiple high current drivers. If your calculations show that the hybrid should be heat sunk, you may f ind it convenient to place it top dow n on the PC board so that the bottom of the hybrid may be mounted directly to the metal case of your package. Other Diode Drivers +5V Output #1 M ode Control #1 Input #1 Output #2 M ode Control #2 Input #2 Output #3 M ode Control #3 Input #3 Ground 1 11 22 12 645 SQ M A X DD320/420/620 DD320/420/620 X X X X TOP V IEW V ee (-SV to – 15V ) Output #6 M ode Control #6 Input #6 Output #5 M ode Control #5 Input #5 Output #4 M ode Control #4 Input #4 Ground 500 M IN TY P .015 Pkg Bottom .067 .150 M A X M ETA L W ELDED PA CK A GE In addition to these standard circuits, Spectrum Microwave produces a wide range of custom-designed drivers. These include a dual ECL-input driver (DD212) and a 28-channel 50 mA driver (DD2850). Spectrum Microwave is also one of the largest custom hybrid manufacturers in the United States. Please contact the factory or your local representative for a quote on your driver requirements or your own custom hybrid circuit. |
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