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| UM9401 / UM9402 / UM9415 COMMERCIAL TWO-WAY RADIO ANTENNA SWITCH DIODES DESCRIPTION Microsemi offers a series of PIN diodes specifically designed and characterized for solid state antenna switches in commercial two-way radios. Antenna switches using the UM9401 and UM9415 series PIN diodes provide high isolation, low loss and low distortion characteristics formerly possible only with electromechanical relay type switches. The UM9401 and the UM9402 diodes can handle 100 W of transmitter power, while The UM9415 will handle over 1000 W. The extensive characterization of these PIN diodes in antenna switch applications has resulted in guaranteed low distortion specifications under transmit and receive conditions. These diodes also feature low forward bias resistance and high zero bias impedance which are required for low loss, high isolation and wide bandwidth antenna switch performance. KEY FEATURES WWW .Microsemi .C OM High transmitter power UM9401/UM9402 => 100 W UM9415 => 1000 W Low harmonic distortion Low third order distortion High carrier lifetime Non cavity design Thermally matched configuration Low capacitance at 0 V bias Low conductance at 0 V bias Compatible with automatic insertion equipment IMPORTANT: For the most current data, consult MICROSEMI's website: http://www.microsemi.com ABSOLUTE MAXIMUM RATINGS AT 25 C (UNLESS OTHERWISE SPECIFIED) Package Reverse Voltage Average Power Dissipation (PA) Condition @ Ir = 10 uA 1/2 in. total length to 25 C Contact 25 oC (Package Flange Temperature Free Air O UM9401 50 V 5.5 W UM9402 50 V UM9415 50 V 10 W 10 W 1.5 W 2.5 W APPLICATIONS/BENEFITS Isolated stud package available Surface mount package available UM9401 / UM9402 / UM9415 UM9401 / UM9402 / UM9415 Copyright 2005 Rev. 0, 2005-09-15 Microsemi Page 1 UM9401 / UM9402 / UM9415 COMMERCIAL TWO-WAY RADIO ANTENNA SWITCH DIODES WWW .Microsemi .C OM UM9401/UM9402 Parameter Reverse Current Series Resistance Capacitance Parallel Resistance Carrier Lifetime Forward Voltage Transmit Harmonic Distortion Receive Third Order Distortion UM9415 Min 10 1.0 4 1k 5.0 1.0 80 60 Typ Max Units Symbol IR RS CT RP Conditions Vr = 50 V If = 50 mA, F= 100 MHz VR = 0 V, F = 100 MHZ VR = 0 V, F = 100 MHz IF = 10 mA If = 50 mA Pin = 50 W f = 50 MHz, If = 50 mA Pin = 10 W, 0 V Bias fA = 50 MHz, fB = 51 MHz Min 10 1.0 1.5 5k 2.0 1.0 80 60 Typ Max uA Ohm pF Ohms us V -dB -dB Vf R2A/A R3A/A R2AB/A Rs versus If TYPICAL 103 f = 100 MHz 102 UM9401/UM9402 Rs (Ohms) UM9415 101 0 10 10-1 10-5 10-4 10-3 10-2 10-1 100 ELECTRICALS ELECTRICALS If (A) Copyright 2005 Rev. 0, 2005-09-15 Microsemi Page 2 UM9401 / UM9402 / UM9415 COMMERCIAL TWO-WAY RADIO ANTENNA SWITCH DIODES Ct versus f TYPICAL 10 8 7 6 5 Vr = 0 V WWW .Microsemi .C OM Ct (pF) 4 UM9415 3 Vr = 50 V 2 Vr = 0 V UM9401/UM9402 Vr = 50 V 1 10 100 1000 f (MHz) Vf versus If TYPICAL 100 10-1 10 -2 If (A) UM9415 10 -3 UM9401/UM9402 ELECTRICALS ELECTRICALS 10-4 10 -5 0.0 0.2 0.4 0.6 0.8 1.0 1.2 Vf (V) Copyright 2005 Rev. 0, 2005-09-15 Microsemi Page 3 UM9401 / UM9402 / UM9415 COMMERCIAL TWO-WAY RADIO ANTENNA SWITCH DIODES Rp versus f TYPICAL 103 WWW .Microsemi .C OM 102 Rp (kOhms) 101 UM9401/UM9402 Vr = 50 V UM9415 Vr = 50 V UM9401/UM9402 Vr = 0 V UM9415 Vr = 0 V 100 101 102 103 104 f (MHz) ELECTRICALS ELECTRICALS Copyright 2005 Rev. 0, 2005-09-15 Microsemi Page 4 UM9401 / UM9402 / UM9415 COMMERCIAL TWO-WAY RADIO ANTENNA SWITCH DIODES WWW .Microsemi .C OM MAXIMUM TRANSMITTER POWER UM9415 Zo = 50 Ohms, L = 1/2", SWR = INFINITE 3000 Maximum Transmitter Power (W) 1000 If = 1 A If = 500 mA 100 If = 200 mA ELECTRICALS ELECTRICALS If = 100 mA If = 50 mA 10 25 50 75 100 125 o 150 175 200 Lead Temperature ( C) Copyright 2005 Rev. 0, 2005-09-15 Microsemi Page 5 UM9401 / UM9402 / UM9415 COMMERCIAL TWO-WAY RADIO ANTENNA SWITCH DIODES MAXIMUM TRANSMITTER POWER UM9401/UM9402 1000 Zo = 50 Ohms, L = 1/2", SWR = INFINITE WWW .Microsemi .C OM Maximum Transmitter Power (W) 100 If = 200 mA If = 100 mA 10 If = 50 mA If = 20 mA If = 10 mA 1 25 50 75 100 125 o 150 175 200 Lead Temperature ( C) ELECTRICAL ELECTRICAL ELECTRICALSS ELECTRICALSS Maximum Transmitter Power Copyright 2005 Rev. 0, 2005-09-15 Microsemi Page 6 UM9401 / UM9402 / UM9415 COMMERCIAL TWO-WAY RADIO ANTENNA SWITCH DIODES WWW .Microsemi .C OM The maximum CW transmitter power, PT(max), a PIN diode antenna switch can handle depends on the diode resistance, RS, power dissipation, PD, antennae SWR, , and the nominal impedance, ZO. The expression is as follows: is less than 0.3 dB. This performance is achievable across a 20 % bandwidth at center frequencies ranging from 10 to 500 MHz. Characteristic curves are shown in the data section which gives both the maximum and typical diode resistance, RS as a function of forward current. The maximum power dissipation rating of the PIN diode depends both on the length of the diode leads and the temperature of the contacts to which the leads are connected. A graph defining the maximum power dissipation at various combinations of overall lead length (L) and lead temperature (TL) is given in the data section. From these curves and the above equation, the power handling capability of the PIN diode may be computed for a specific application. Curves are also presented which show the maximum transmitter power that an antenna switch using UM9401s and UM9415s can safely handle for various forward currents and lead temperatures. These curves are based on a typical design condition of a 1/2 in. total overall lead length, 50 line impedance, and a totally mismatched antenna ( = ). For the case of a perfectly matched antenna, the maximum transmitter power can be increased by a factor of 4. Design Information A circuit configuration for a two-way radio antenna switch using PIN diodes consists of a diode placed in series with the transmitter and a shunt diode placed a quarter wavelength from the antenna in the direction of the receiver as shown. For low frequency operation, the quarter wave line may be simulated by lumped elements. Typical performance of antenna switches using PIN diodes forward biased at 100 mA is less than 0.2 dB insertion loss and 30 dB isolation during transmit; at zero bias the receive insertion loss Copyright 2005 Rev. 0, 2005-09-15 DC SUPPLY ANTENNA D1 /4 TRANSMITTER D2 RECEIVER DC SUPPLY ANTENNA D1 L D2 TRANSMITTER RECEIVER L = ZO / 2 fO (H) C = 1/2 fO ZO (F) L C C Microsemi Page 7 UM9401 / UM9402 / UM9415 COMMERCIAL TWO-WAY RADIO ANTENNA SWITCH DIODES WWW .Microsemi .C OM STYLE "UM9401B" STYLE "UM9415B" STYLE "UM9401SM" STYLE "UM9415SM" MECHANICAL MECHANICAL Copyright 2005 Rev. 0, 2005-09-15 Microsemi Page 8 UM9401 / UM9402 / UM9415 COMMERCIAL TWO-WAY RADIO ANTENNA SWITCH DIODES WWW .Microsemi .C OM UM9401 STYLE "SM" FOOTPRINT NOTES: 1. These dimensions will match the terminals and provide for additional solder fillets at the outboard ends at least as wide as the terminals themselves, assuming accuracy of placement within 0.005" 2. If the mounting method chosen requires use of an adhesive separate from the solder compound, a round (or square) spot of cement as shown should be centrally located. MECHANICAL MECHANICAL UM9415 STYLE "SM" FOOTPRINT Copyright 2005 Rev. 0, 2005-09-15 Microsemi Page 9 UM9401 / UM9402 / UM9415 COMMERCIAL TWO-WAY RADIO ANTENNA SWITCH DIODES WWW .Microsemi .C OM Copyright 2005 Rev. 0, 2005-09-15 Microsemi Page 10 UM9401 / UM9402 / UM9415 COMMERCIAL TWO-WAY RADIO ANTENNA SWITCH DIODES NOTES: WWW .Microsemi .C OM NOTES NOTES Copyright 2005 Rev. 0, 2005-09-15 Microsemi Page 11 |
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