ALPHA AV141-321

Preliminary
GaAs IC 25 dB Voltage
Variable Attenuator 2.7–4.0 GHz
AV141-321
Features
■ Power Control for 3.5 GHz Fixed
Wireless Applications
■ Minimum 25 dB Attenuation
■ Positive 0.2–1.2 V Control Voltage
■ QFN-12 3 x 3 mm Package
■ Low Cost
■ No External Components Needed
Description
The AV141-321 is a GaAs IC PHEMT voltage variable
attenuator that has been designed for WLAN applications.
Operating from 2.7–4.0 GHz, the AV141-321 is ideal for
low cost applications such as 3.5 GHz fixed wireless LAN
power control applications.
Absolute Maximum Ratings
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
1. All measurements made in a 50 Ω system, unless otherwise specified.
2. For worst case state.
Electrical Specifications at 25°C
Parameter
Frequency
Insertion Loss (VC = 1.2 V)
Min.
2.7–4.0 GHz
Maximum Attenuation (VC = 0.2 V)
2.7–4.0 GHz
VSWR — All Ports
2.7–4.0 GHz
25
Typ.
Max.
Unit
0.7
1.0
dB
30
dB
1.5
1.8
Min.
Typ.
Max.
80
50
150
25
ns
ns
mV
13
dBm
Operating Characteristics at 25°C (0, +1.2 V)
Parameter
Switching Characteristics
Condition
Frequency
Rise, Fall (10/90% or 90/10% RF)
On, Off (50% CTL to 90/10% RF)
Video Feedthru
Maximum Input Power
for < 1 dB Attenuation Variation
2.7–4.0 GHz
Input 3rd Order Intercept Point (IIP3)
2.7–4.0 GHz
Control Voltage
20
0.2
Unit
dBm
1.2
V
1. All measurements made in a 50 Ω system, unless otherwise specified.
2. For worst case state.
Alpha Industries, Inc. [978] 241-7000 • Fax [978] 241-7906 • Email [email protected] • www.alphaind.com
Specifications subject to change without notice. 1/02A
1
GaAs IC 25 dB Voltage Variable Attenuator 2.7–4.0 GHz
AV141-321
Typical Performance Data at 25°C
-0.4
Maximum Attenuation (dB)
0
Insertion Loss (dB)
-0.5
-0.6
-0.7
-0.8
-0.9
-1.0
2.8
3.0
3.2
3.4
3.6
3.8
-5
-10
-15
-20
-25
-30
-35
-40
2.8
4.0
3.0
3.2
3.4
3.6
3.8
4.0
Frequency (GHz)
Frequency (GHz)
Insertion Loss vs. Frequency
Maximum Attenuation vs. Frequency
1.8
0
1.6
-10
Output
-15
VSWR
Attenuation (dB)
-5
-20
-25
1.4
Input
1.2
-30
-35
-40
0.2
0.4
0.6
0.8
1.0
1.0
0.2
1.2
0.8
1.0
VC (V)
Attenuation vs. Control Voltage
VSWR vs. Control Voltage
1.2
22
Maximum Attenuation
21
IIP3 (dBm)
1.6
VSWR
0.6
VC (V)
1.8
1.4
Minimum Attenuation
20
19
1.2
1.0
2.8
2
0.4
3.0
3.2
3.4
3.6
3.8
4.0
18
2.8
3.0
3.2
3.4
3.6
3.8
Frequency (GHz)
Frequency (GHz)
Output VSWR vs. Frequency
Input IP3 vs. Frequency
Alpha Industries, Inc. [978] 241-7000 • Fax [978] 241-7906 • Email [email protected] • www.alphaind.com
Specifications subject to change without notice. 1/02A
4.0
GaAs IC 25 dB Voltage Variable Attenuator 2.7–4.0 GHz
Evaluation Board Layout
AV141-321
QFN-12
0.008 (0.20 mm)
SEATING PLANE
0.118 (3.00 mm)
PIN 1
INDICATOR
0.001
(0.02 mm)
SK39506
0.118
(3.00 mm)
0.030
(0.75 mm)
± 0.002
(0.05 mm)
VVA Test Board
0.029
(0.73 mm)
EXPOSED
PAD
PIN 1
INDICATOR
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)
0.0196
(0.50 mm) BSC
N/C
N/C
N/C
11
10
8
3
7
J2
N/C
N/C
VC
N/C
N/C
6
9
2
4
N/C
1
5
N/C
J1
12
Pin Out
Ground is connected to paddle on bottom.
Typical S-Parameters (Control Voltage 0/+1.2 V)
Insertion Loss State
# GHZ S MA R 50
High Attenuation State
# GHZ S MA R 50
Freq.
(GHz)
S11
S11a
2.5
0.330
66.05
0.887 -135.38 0.913
-135.67 0.312
3.0
0.242
18.19
0.914 -175.58 0.946
-175.25 0.210
-22.04
3.5
0.165
-33.76
0.913 144.77
0.951
144.79
0.145
-94.37
4.0
0.070
-68.30
0.916 103.60
0.959
103.52
0.080 -152.16
0.134 -151.61
0.046 -178.59 0.047 -179.41 0.224 -161.45
S21
S21a
S12
S12a
S22
S22a
S11
S11a
S21
S21a
S12
S12a
S22
S22a
45.02
0.160
5.13
0.074
126.57
0.074
126.20
0.161
-18.79
0.129 -40.89
0.021
46.26
0.021
46.12
0.172
-71.10
0.152 -97.28
0.026 -107.80 0.026 -107.54 0.209 -118.44
Measured S-Parameters include the evaluation board.
Alpha Industries, Inc. [978] 241-7000 • Fax [978] 241-7906 • Email [email protected] • www.alphaind.com
Specifications subject to change without notice. 1/02A
3