Alpha Industries, Inc. [781] 935-5150 •Fax [978] 241-7906 •Email sales@alphaind.com •www.alphaind.com 1
Specifications subject to change without notice. 8/01A
PHEMT GaAs IC High Power
SP3T Switch DC–2 GHz
Features
■Positive Low Voltage Control
(0/2.75 V Operation)
■Low Insertion Loss (< 0.6 dB @ 2 GHz)
■High Isolation (30 dB at 1 and 2 GHz)
■Excellent Harmonics Performance
(65 dBc @ 2.75 V 1 GHz PIN = 34 dBm)
■Miniature MLP-12 Plastic Package
■PHEMT Process
MLP-12
AS202-321
0.008 (0.20 mm)
SEATING PLANE
0.118 (3.00 mm)
PIN 1
INDICATOR
PIN 1
INDICATOR
0.118
(3.00 mm)
0.001
(0.02 mm)
0.030
(0.75 mm)
± 0.002
(0.05 mm)
EXPOSED
PAD
0.029
(0.73 mm)
0.0196
(0.50 mm) BSC
0.057 (1.45 mm) SQ.
+ 0.004 (0.10 mm)
- 0.006 (0.15 mm)
0.009 (0.23 mm)
+ 0.003 (0.07 mm)
- 0.002 (0.05 mm)
Description
The AS202-321 is a PHEMT GaAs IC SP3T antenna
switch operating in the 900 MHz and 1800 MHz
frequency bands. Switching between the antenna and
TX/RXports is accomplished with 3 control inputs. When
the control inputs are driven with the appropriate voltages,
a low insertion loss path is provided from an antenna
port to an RXor TXport, while the other ports have
high attenuation.
Parameter Frequency Min. Typ. Max. Unit
Insertion Loss Ant-RF1, RF2, RF3 0.1–0.5 GHz 0.55 0.75 dB
0.5–1.0 GHz 0.60 0.80 dB
1.0–2.0 GHz 0.80 1.10 dB
Isolation Ant-RF1, RF2, RF3 0.1–0.5 GHz 25 28 dB
0.5–1.0 GHz 22 25 dB
1.0–2.0 GHz 22 25 dB
Return Loss Ant-RF1, RF2, RF3 0.1–0.5 GHz 18 dB
0.5–1.0 GHz 18 dB
1.0–2.0 GHz 14 dB
Electrical Specifications at 25°C (0, +2.75 V)
Preliminary
Parameter Condition Frequency Min. Typ. Max. Unit
2nd Harmonic 34 dBm In @ 2.75 V 1 GHz 72 dBc
3rd Harmonic 34 dBm In @ 2.75 V 1 GHz 65 dBc
2nd Harmonic 32 dBm In @ 2.75 V 2 GHz 70 dBc
3rd Harmonic 32 dBm In @ 2.75 V 2 GHz 65 dBc
Gate Leakage Current 34 dBm In @ 2.75 V 0.030 mA
Control Voltages VHigh -0.25 0 0.25 V
VLow 2.60 2.75 5.00 V
Operating Characteristics at 25°C (0, +2.75 V)
PHEMT GaAs IC High Power SP3T Switch DC–2 GHz AS202-321
2Alpha Industries, Inc. [781] 935-5150 •Fax [978] 241-7906 •Email sales@alphaind.com •www.alphaind.com
Specifications subject to change without notice. 8/01A
V1
RF1
GND
V2
RF2
GND
ANT
GND
N/C
V3
RF3
GND
CBL
CBL
CBL CBL
Pin Out
Typical Performance Data (0, +2.75 V, CBL = 47 pF)
Insertion Loss vs. Frequency
Frequency (GHz)
Insertion Loss (dB)
-2.0
-1.6
-1.2
-0.8
-0.4
0
0.4
0.8
1.2
1.6
2.0
0 0.5 1.0 1.5 2.0 2.5 3.0
Ant-RF1
Ant-RF2
Ant-RF3
Isolation vs. Frequency
Frequency (GHz)
Isolation (dB)
-50
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
0 0.5 1.0 1.5 2.0 2.5 3.0
Ant-RF1
Ant-RF2
Ant-RF3
Return Loss vs. Frequency
Frequency (GHz)
Return Loss (dB)
-25
-20
-15
-10
-5
0
0 0.5 1.0 1.5 2.0 2.5 3.0
Ant-RF1
Ant-RF2
Ant-RF3
2nd and 3rd Harmonics
vs. Control Voltage
0
10
20
30
40
50
60
70
80
90
2.0 2.5 3.0 3.5 4.0 4.5
Control Voltage (V)
2nd and 3rd Harmonics (dBc)
2nd Harmonic
3rd Harmonic
V1V2V3Ant-RF1 Ant-RF2 Ant-RF3
VHigh VLow VLow Ins. Loss Isolation Isolation
VLow VHigh VLow Isolation Ins. Loss Isolation
VLow VLow VHigh Isolation Isolation Ins. Loss
Truth Table
VLow = 0–0.2 V.
VHigh = 2.75–5 V.
DC blocks required. CBL = 47 pF for operation >500 MHz.
