Datasheet RF2425, RF2425PCBA Datasheet (RF Micro Devices)

9-19

9

ATTENTUATORSAND

SWITCHES

Product Description

Ordering Information

Typical Applications

Features

Functional Block Diagram

RF Micro Devices, Inc.
7625 ThorndikeRoad
Greensboro,NC 27409, USA

Tel [phone]

Fax [phone]

http://www.rfmd.com

Optimum Technology Matching® Applied

Si BJT GaAs MESFETGaAs HBT
Si Bi-CMOS

ü

SiGe HBT

Si CMOS

1

2

3

4

8

7

6

5

IN1

GND

VDD

OUT2

OUT1

GND

CTRL

IN2

RF2425

4-PORT TRANSFER SWIT CH

• Cordless Phones

• Wireless Computer Peripherals

• Wireless Security Systems

• General Purpose RF Switching

• Commercial and Consumer Systems

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 m ake 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 1.5 V and
as high as 6V with a CMOS logic driver for the control
input.

• Single Power Supply of 1.5V to 6.0V

• Low Current Consumption

• 0.5dB Insertion Loss at 900MHz

• 24dB Crosstalk Isolation at 9 00MHz

• +31dBm Output P1dB

RF2425 4-Port TransferSwitch
RF2425 PCBA Fully Assembled Evaluation Board

9

Rev A1 010228

.156
.152

.022
.018

5°

.056
.052

.195
.191

.240
.232

.050

.008

.004

MIN

.017

1

Package Style: SOP-8

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RF2425

Rev A1 010228

9

ATTENTUATORSAND

SWITCHES

Absolute Maximum Ratings

Parameter Rating Unit

Supply Voltage 0 to +8.0 V

DC

Control Voltage -1.0 to +6.0 V

DC

Input RF Power +33 dBm
Operating Ambient Temperature -40 to +85 °C
Storage Temperature -40 to +150 °C

Parameter

Specification

Unit Condition

Min. Typ. Max.

Overall

T=25°C, VDD=3.0V,Freq=900MHz

Frequency Range DC to 2000 MHz
Insertion Loss 0.5 1 dB
Isolation 20 24 dB CTRL=“Low;” IN1 to OUT2 crosstalk

20 24 dB CTRL=“High;” IN2 to OUT1 crosstalk
“On” Input VSWR 1:1 Input of active channel
“Off” Input VSWR 100:1 Input of inactive channel (open circuit)
Output P1dB +31 dBm

Control Logic

CTRL Logic “Low” Voltage 0 V Channel 1 On, Channel 2 Off
CTRL Logic “High” Voltage 0.7 V Channel 2 On, Channel 1 Off

Power Supply

Voltage 3 V Specifications

1.5 to 6 V Operating Limits

Current 1 2 mA CTRL=“Low”

2 2.5 mA CTRL=“High”

Caution! ESD sensitive device.

RF Micro Devices believes the furnished informationis correct and accurate
at the time ofthis 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).

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RF2425

Rev A1 010228

9

ATTENTUATORSAND

SWITCHES

Evaluation Board Schematic

(Download Bill of Materials from www.rfmd.com.)

Pin Function Description Interface Schematic

1IN1

Input pin for Channel 1. Channel1 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 o f the switch are b idirectional, this pin may be used as
an output with OUT1 as its input depending on layout preference.

2GND

Ground connection. Keep traces physically short and connect immedi­ately to the ground plane for best performance.

3VDD

Power supply. An external RF bypass capacitor is recommended.

4OUT2

Output pin for Channel 2. This pin may be used as the channel 2 input
instead; see pin 5 description.

5IN2

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 o f the switch are b idirectional, this pin may be used as
an output with OUT2 as its input depending on layout preference.

6CTRL

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.

7GND

Same as pin 2.

8OUT1

Output pin for Channel 1. This pin may be used as the channel 1 input
instead; see pin 1 description.

1

2

3

4

8

7

6

5

C1

15 pF

C4

15 pF

C3

15 pF

C2

15 pF

50Ωµstrip

50Ωµstrip50Ωµstrip

50Ωµstrip

IN1

J1

OUT2

J2

VDD

C6

15 pF

C5

1

µ

F

CTRL

OUT1

J4

IN2

J3

2425400-

P1-1

P1-3

P1

VDD
GND

1
2
3

CTRL

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RF2425

Rev A1 010228

9

ATTENTUATORSAND

SWITCHES

Evaluation Board Layout

Board Size 1.236” x 1.186”