32849

32849
Preliminary
GaAs IC SPST Switch
Single Positive Control 0.5–2.5 GHz
AS156-73
Features
SOT-6
■ Single Positive Control Voltage
0.074
(1.90 mm REF.)
■ +3 V to +5 V Operation
0.126 (3.20 mm)
0.087 (2.20 mm)
PIN 6
■ Isolation Can be Tuned to Desired
Frequency
0.071 (1.80 mm)
0.052 (1.30 mm)
PIN 1
INDICATOR
PIN 1
■ High Isolation (45 dB at 0.9 GHz with
100 pF Bypass Capacitor)
■ Designed for Use as a LNA Bypass Switch
Description
The AS156-73 is an SPST FET IC switch. The switch
requires external DC blocking capacitors and one
bypass capacitor. Isolation is optimized at 0.9 GHz utilizing
100 pF bypass capacitor and optimized at 1.9 GHz utilizing
a 2.7 pF bypass capacitor. This switch requires a positive
supply and single positive control. The device is mounted
in the SOT-6 package for surface mounting in commercial
switching applications, specifically as a LNA bypass
switch.
0.020 (0.51 mm)
0.014 (0.350 mm)
0.037 (0.95 mm) REF.
0.057 (1.45 mm)
0.035 (0.90 mm)
0.006
(0.15 mm)
0.000
(0.00 mm)
0.012
(0.30 mm)
TYP.
5.0˚ ± 1˚
0.014
(0.26 mm)
0.004
(0.10 mm)
5.0˚ ± 1˚
0.122 (3.10 mm)
0.106 (2.70 mm)
0.022 (0.61 mm)
0.004 (0.10 mm)
Electrical Specifications at 25°C (0, +3 V) CBYPASS = 100 pF
Parameter1
Insertion
Frequency2
Loss3
Min.
0.5–1.4 GHz
1.4–2.0 GHz
2.0–2.5 GHz
Isolation
0.5–1.4 GHz
1.4–2.0 GHz
2.0–2.5 GHz
VSWR
0.5–2.5 GHz
40
23
10
Typ.
Max.
Unit
0.65
0.70
0.75
0.75
0.80
0.90
dB
dB
dB
45
28
15
dB
dB
dB
1.3:1
Operating Characteristics at 25°C (0, +3 V)
Parameter
Condition
Frequency
Min.
Typ.
Max.
Unit
1
1
10
µs
µs
mV
0.9 GHz
0.9 GHz
18
27
dBm
dBm
0.5–2.0 GHz
43
dBm
Switching Characteristics4
Rise, Fall (10/90% or 90/10% RF)
On, Off (50% CTL to 90/10% RF)
Video Feedthru
Input Power for 1 dB Compression
0/+3 V
0/+5 V
Intermodulation Intercept Point (IP3)
For Two-tone Input Power +13 dBm
0/+5 V
Control Voltages
VLow = 0 to 0.2 V @ 20 µA Max.
VHigh = +3 V @ 100 µA Max. to +5 V @ 200 µA Max.
VS = VHigh ± 0.2 V
1. All measurements made in a 50 Ω system, unless otherwise specified.
2. DC = 300 kHz.
3. Insertion loss changes by 0.003 dB/°C.
4. Video feedthru measured with 1 ns risetime pulse and 500 MHz bandwidth.
Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email sales@alphaind.com • www.alphaind.com
Specifications subject to change without notice. 3/99A
1
GaAs IC SPST Switch Single Positive Control 0.5–2.5 GHz
AS156-73
Typical Performance Data (0, +3 V)
1.0
60
0.9
CBYPASS = 100 pF
50
0.8
40
dB
dB
0.7
0.6
0.5
CBYPASS = 2.7 pF
30
20
0.4
10
0.3
0
0.2
0.5
1.0
1.5
2.0
2.5
0.5
1.0
1.5
2.0
2.5
Frequency (GHz)
Frequency (GHz)
Insertion Loss vs. Frequency
Isolation vs. Frequency
CBYPASS value and exact location determines frequency response of isolation
(see isolation vs. frequency curve as example).
Truth Table
V1
J1–J2
VHigh
Insertion Loss
0
Isolation
VHigh = +3 to +5 V (VS = VHigh ± 0.2 V).
Absolute Maximum Ratings
Characteristic
RF Input Power
Value
2.5 W Max. > 500 MHz,
0/+8 V Control
Supply Voltage, VS
+8 V
Control Voltage, V1
-0.2 V, +8 V
Operating Temperature
-40°C to +85°C
Storage Temperature
-65°C to +150°C
ΘJC
25°C/W
Pin Out
VS
10 k
6
1
J1
CBL
GND
CBYPASS
5
4
3
J2
2
GND
CBL
GND
V1
DC blocking capacitors (CBL) must be supplied externally.
CBL = 100 pF for operation >500 MHz.
2
Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email sales@alphaind.com • www.alphaind.com
Specifications subject to change without notice. 3/99A
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