RF2425 9 4-PORT TRANSFER SWITCH Typical Applications • Cordless Phones • General Purpose RF Switching • Wireless Computer Peripherals • Commercial and Consumer Systems • Wireless Security Systems Product Description The RF2425 is a very low-cost single-throw, double-pole GaAs MESFET switch. There are two bidirectional input/ output channels which can be turned off or on by a single logic control line. Two of the ports may be tied together externally to make a transmit/receive switch. The device can handle power levels as high as +32dBm and spans a frequency range from DC to 2000MHz. The switch will operate from power supply voltages as low as 1.5V and as high as 6V with a CMOS logic driver for the control input. .004 MIN .156 .152 .017 1 .195 .191 .050 .240 .232 .056 .052 5° Optimum Technology Matching® Applied Si BJT GaAs HBT Si Bi-CMOS SiGe HBT ü ATTENTUATORS AND SWITCHES 9 .022 .018 .008 Package Style: SOP-8 GaAs MESFET Si CMOS Features • Single Power Supply of 1.5V to 6.0V • Low Current Consumption • 0.5dB Insertion Loss at 900MHz • 24dB Crosstalk Isolation at 900MHz IN1 1 8 OUT1 GND 2 7 GND VDD 3 6 CTRL OUT2 4 5 IN2 • +31dBm Output P1dB Ordering Information RF2425 RF2425 PCBA Functional Block Diagram Rev A1 010228 4-Port Transfer Switch Fully Assembled Evaluation Board RF Micro Devices, Inc. 7625 Thorndike Road Greensboro, NC 27409, USA Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com 9-19 RF2425 Absolute Maximum Ratings Parameter Supply Voltage Control Voltage Input RF Power Operating Ambient Temperature Storage Temperature Parameter Rating Unit 0 to +8.0 -1.0 to +6.0 +33 -40 to +85 -40 to +150 VDC VDC dBm °C °C Specification Min. Typ. Max. Caution! ESD sensitive device. RF Micro Devices believes the furnished information is correct and accurate at the time of this printing. However, RF Micro Devices reserves the right to make changes to its products without notice. RF Micro Devices does not assume responsibility for the use of the described product(s). Unit T=25 °C, VDD =3.0V, Freq=900MHz Overall Frequency Range Insertion Loss Isolation “On” Input VSWR “Off” Input VSWR Output P1dB Condition 20 20 DC to 2000 0.5 24 24 1:1 100:1 +31 1 MHz dB dB dB CTRL=“Low;” IN1 to OUT2 crosstalk CTRL=“High;” IN2 to OUT1 crosstalk Input of active channel Input of inactive channel (open circuit) dBm Control Logic CTRL Logic “Low” Voltage CTRL Logic “High” Voltage 0 0.7 V V 3 1.5 to 6 1 2 V V mA mA Channel 1 On, Channel 2 Off Channel 2 On, Channel 1 Off Power Supply Voltage Current 2 2.5 ATTENTUATORS AND SWITCHES 9 Specifications Operating Limits CTRL=“Low” CTRL=“High” 9-20 Rev A1 010228 RF2425 Pin 1 Function IN1 2 GND 3 4 VDD OUT2 5 IN2 6 CTRL 7 8 GND OUT1 Description Interface Schematic Input pin for Channel 1. Channel 1 is chosen with a logic level “Low” on pin 6, CTRL. The input VSWR is 1:1 when this channel is active and highly capacitive (open circuit) when this channel is inactive. Since both channels of the switch are bidirectional, this pin may be used as an output with OUT1 as its input depending on layout preference. Ground connection. Keep traces physically short and connect immediately to the ground plane for best performance. Power supply. An external RF bypass capacitor is recommended. Output pin for Channel 2. This pin may be used as the channel 2 input instead; see pin 5 description. Input pin for Channel 2. Channel 2 is chosen with a logic level “High” on pin 6, CTRL. The input VSWR is 1:1 when this channel is active and highly capacitive (open circuit) when this channel is inactive. Since both channels of the switch are bidirectional, this pin may be used as an output with OUT2 as its input depending on layout preference. Control pin. This pin chooses which channel is active. A “Low” level chooses Channel 1; a “High” level chooses Channel 2. CMOS logic may be used to drive the control input. Same as pin 2. Output pin for Channel 1. This pin may be used as the channel 1 input instead; see pin 1 description. Evaluation Board Schematic (Download Bill of Materials from www.rfmd.com.) P1 P1-3 9 1 VDD 2 GND 3 CTRL ATTENTUATORS AND SWITCHES P1-1 2425400IN1 J1 50 Ω µstrip C5 1 µF C1 15 pF C6 15 pF VDD OUT2 J2 Rev A1 010228 C4 15 pF 1 8 2 7 3 6 4 5 50 Ω µstrip CTRL 50 Ω µstrip 50 Ω µstrip C2 15 pF OUT1 J4 C3 15 pF IN2 J3 9-21 RF2425 Evaluation Board Layout Board Size 1.236” x 1.186” ATTENTUATORS AND SWITCHES 9 9-22 Rev A1 010228