ALPHA AS209-321 Datasheet

Alpha Industries, Inc. [978] 241-7000 • Fax [978] 241-7906 • Email [e-mail] • www.alphaind.com 1

Specifications subject to change without notice. 1/02A

GaAs IC Reflective SPDT DC–6 GHz

Features

■ Single Broadband Design Covers

802.11a, 802.11b and 3.5 GHz Fixed
Wireless Applications

■ Positive Voltage Control (0, +5 V)

■ Low Insertion Loss Thru 6 GHz

■ High Linearity

■ QFN-12 3 x 3 mm Package

■ Low Cost

AS209-321

Description

The AS209-321 is a GaAs PHEMT reflective SPDT
switch that has been designed for WLAN TX/R

X

applications. This device has been optimized to provide
excellent performance from DC–6 GHz.The AS209-321’s
high frequency, low loss and high linearity make it an
ideal choice for 802.11a, 802.11b and 3.5 GHz fixed
wireless LAN applications.

Parameter Frequency Min. Typ. Max. Unit

Insertion Loss DC–2 GHz 0.7 1.0 dB

DC–3 GHz 0.8 1.2 dB
DC–4 GHz 1.1 1.4 dB
DC–6 GHz 1.2 1.5 dB

Isolation DC–2 GHz 30 34 dB

DC–3 GHz 28 32 dB
DC–4 GHz 25 29 dB
DC–6 GHz 20 24 dB

Return Loss (On State) DC–2 GHz 15 18 dB

DC–3 GHz 12 15 dB
DC–4 GHz 10 13 dB
DC–6 GHz 10 13 dB

Electrical Specifications at 25°C (0, +5 V)

Preliminary

Parameter Condition Frequency Min. Typ. Max. Unit

Switching Characteristics Rise, Fall (10/90% or 90/10% RF) 30 ns

On, Off (50% CTL to 90/10% RF) 50 ns
Video Feedthru 25 mV

Input Intermodulation Intercept Point (IIP3) 0/+5 V 1–4 GHz 46 dBm

Control Voltages VC1or VC2= “0” 0 0.5 V

V

C1

or VC2= “1” with @ 200 µA Max. 3.5 5.0 V

Operating Characteristics at 25°C (0, +5 V)

Characteristic Value

RF Input Power 1 W Max. > 500 MHz

Control Voltage -0.2 V, +6 V

Operating Temperature -40°C to +85°C

Storage Temperature -65°C to +150°C

Absolute Maximum Ratings

GaAs IC Reflective SPDT DC–6 GHz AS209-321

2 Alpha Industries, Inc. [978] 241-7000 • Fax [978] 241-7906 • Email [e-mail] • www.alphaind.com

Specifications subject to change without notice. 1/02A

V

C2

J

2

N/C

N/C

N/C

N/C

J

1

VC

1

N/C

N/C

J

3

N/C

C

BL

C

BL

C

BL

Pin Out

Typical Performance Data (0, +5 V, C

BL

= 47 pF)

Insertion Loss vs. Frequency

Frequency (GHz)

Insertion Loss (dB)

01234 657

-2.50

-2.25

-2.00

-1.75

-1.50

-1.25

-1.00

-0.75

-0.50

-0.25

0

Isolation vs. Frequency

Frequency (GHz)

Isolation (dB)

01234 657

-50

-40

-30

-20

-10

0

J

2

Return Loss vs. Frequency

Frequency (GHz)

Return Loss (dB)

01234 657

-20

-15

-10

-5

0

J

1

J

2

Input IP3 vs. Frequency

Frequency (GHz)

Input IP3 (dBm)

45

46

47

48

49

50

3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9

V

C1

V

C2

J1–J

2

J1–J

3

0 1 Insertion Loss Isolation

1 0 Isolation Insertion Loss

Truth Table

DC blocks required. CBL= 47 pF for operation >500 MHz.