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RF2425
9
Typical Applications
* Cordless Phones * Wireless Computer Peripherals * Wireless Security Systems * General Purpose RF Switching * Commercial and Consumer Systems
4-PORT TRANSFER SWITCH
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.
.156 .152 .017 1 .195 .191 .050 .240 .232
.004 MIN
.056 .052
5
9
.008
Optimum Technology Matching(R) Applied
Si BJT Si Bi-CMOS GaAs HBT SiGe HBT
u
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 GND 2 VDD 3 OUT2 4
8 OUT1 7 GND 6 CTRL 5 IN2
* +31dBm Output P1dB
Ordering Information
RF2425 RF2425 PCBA 4-Port Transfer Switch Fully Assembled Evaluation Board
Functional Block Diagram
RF Micro Devices, Inc. 7625 Thorndike Road Greensboro, NC 27409, USA
Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com
Rev A1 010228
9-19
ATTENTUATORS AND SWITCHES
.022 .018
RF2425
Absolute Maximum Ratings Parameter
Supply Voltage Control Voltage Input RF Power Operating Ambient Temperature Storage Temperature
Rating
0 to +8.0 -1.0 to +6.0 +33 -40 to +85 -40 to +150
Unit
VDC VDC dBm C C 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).
Parameter
Overall
Frequency Range Insertion Loss Isolation "On" Input VSWR "Off" Input VSWR Output P1dB
Specification Min. Typ. Max.
DC to 2000 0.5 24 24 1:1 100:1 +31 0 0.7 3 1.5 to 6 1 2
Unit
MHz dB dB dB
Condition
T=25 C, VDD =3.0V, Freq=900MHz
1
20 20
CTRL="Low;" IN1 to OUT2 crosstalk CTRL="High;" IN2 to OUT1 crosstalk Input of active channel Input of inactive channel (open circuit)
dBm V V V V mA mA Channel 1 On, Channel 2 Off Channel 2 On, Channel 1 Off Specifications Operating Limits CTRL="Low" CTRL="High"
Control Logic
CTRL Logic "Low" Voltage CTRL Logic "High" Voltage
Power Supply
Voltage
9
ATTENTUATORS AND SWITCHES
Current
2 2.5
9-20
Rev A1 010228
RF2425
Pin 1 Function IN1 Description
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.
Interface Schematic
2 3 4 5
GND VDD OUT2 IN2
6 7 8
CTRL GND OUT1
Evaluation Board Schematic
(Download Bill of Materials from www.rfmd.com.)
P1 P1-1 1 2 P1-3 3 VDD GND CTRL
9
ATTENTUATORS AND SWITCHES
2425400IN1 J1 50 strip C1 15 pF 1 C5 1 F VDD OUT2 J2 50 strip 4 C2 15 pF 5 C3 15 pF C6 15 pF 2 3 8 7 6 50 strip CTRL IN2 J3 C4 15 pF 50 strip OUT1 J4
Rev A1 010228
9-21
RF2425
Evaluation Board Layout Board Size 1.236" x 1.186"
9
ATTENTUATORS AND SWITCHES
9-22
Rev A1 010228

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