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MASW-000822-12770T Datasheet(PDF) 10 Page - Tyco Electronics |
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MASW-000822-12770T Datasheet(HTML) 10 Page - Tyco Electronics |
10 / 10 page HMICTM PIN Diode SP2T 8 Watt Switch for 0.05 – 6.0 GHz Higher Power Applications M/A-COM Inc. and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. M/A-COM makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does M/A-COM assume any liability whatsoever arising out of the use or application of any product(s) or information. • North America Tel: 800.366.2266 / Fax: 978.366.2266 • Europe Tel: 44.1908.574.200 / Fax: 44.1908.574.300 • Asia/Pacific Tel: 81.44.844.8296 / Fax: 81.44.844.8298 Visit www.macom.com for additional data sheets and product information. Rev 1.0 10 MASW-000822-12770T RoHS Compliant Driver and SP2T Schematic with Positive and Negative Voltage Notes for TTL Compatible Driver Functionality using +Vcc and –Vee. 1. The Mode Control defines the Type of TTL Logic. Grounding the Mode Control produces Inverting Logic: TTL 0 ( Input ) = +V , + I ( Output ), and TTL 1 ( Input ) = -V, -I ( Output ). Consequently Connecting the Mode Control to +5V , produces Non- Inverting Logic: TTL 0 ( Input ) = -V , - I ( Output ), and TTL 1 ( Input ) = +V, +I ( Output ). 2. Open circuit output voltage ~ ( +Vcc-0.8V ) or( –Vee + 0.8V ). Diode Forward Voltage , ∆Vd @ 50 mA ~ 1.0 V. 3. Rbias is used to build reverse D.C.voltage for the isolated , “ OFF “ , Series diode to Improve RF Linearity under High RF Signal. Available Negative Bias Current = ( -Vee + ∆Vbe + ∆Vce + ∆Vd) / ( 75Ω + Rbias ) = ( -Vee + 0.3 V + 0.7+ 1.0 V ) / ( 75Ω + Rbias ). As example, using –Vee = -12V for -50 mA bias current to forward Biased PIN Diode, Rbias = [ ( -12V + 2.0 V ) / - 0.05 A ] – 75Ω = 125 Ω. In this example, using Rbias = 120 Ω ,Tx Bias Voltage ~ - [ (120 Ω*0.05A ) + 1.0 V ] ~ -7.0 V. Using + Vcc = + 5V, the “ OFF “ Series Diode will have a Back Biased Voltage ~ | -6.0 V - ( 5 - 0.8 ) V | = | -10.2 V |. 4. The SP2T Switch can be operated from –Vee = -5V with slightly degraded Tx linearity. RF State TTL & D.C. Bias Conditions Voltage at Common Anode Rbias = 120Ω - I bias = - 50 mA Low Loss Tx-Ant & Isolation Tx-Rx TTL = 1 -12V @ -50mA ( Tx ), + 5V @ 0 mA ( Rx ) - 6.0 V Low Loss Ant-Rx & Isolation Rx-Tx TTL = 0 -12V @ -50mA ( Rx ), + 5V @ 0 mA ( Tx ) - 6.0 V D.C. Bias to RF Truth Table |
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