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 RF Input Power Control Voltage Operating Temperature Storage Temperature Value 1 W Max. > 500 MHz -0.2 V, +6 V -40°C to +85°C -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 Insertion Loss (VC = 1.2 V) Maximum Attenuation (VC = 0.2 V) VSWR — All Ports Frequency 2.7–4.0 GHz 2.7–4.0 GHz 2.7–4.0 GHz 25 Min. Typ. 0.7 30 1.5 1.8 Max. 1.0 Unit dB dB
Operating Characteristics at 25°C (0, +1.2 V)
Parameter Switching Characteristics Condition Rise, Fall (10/90% or 90/10% RF) On, Off (50% CTL to 90/10% RF) Video Feedthru 2.7–4.0 GHz 2.7–4.0 GHz 0.2 Frequency Min. 80 Typ. 50 150 25 13 20 1.2 Max. Unit ns ns mV dBm dBm V
Maximum Input Power for < 1 dB Attenuation Variation Input 3rd Order Intercept Point (IIP3) Control Voltage
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 sales@alphaind.com • 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 0
Maximum Attenuation (dB)
-0.5
-5 -10 -15 -20 -25 -30 -35 -40 2.8 3.0 3.2 3.4 3.6 3.8 4.0
Insertion Loss (dB)
-0.6 -0.7 -0.8 -0.9 -1.0 2.8 3.0 3.2 3.4 3.6 3.8 4.0
Frequency (GHz)
Frequency (GHz)
Insertion Loss vs. Frequency
0 -5
Maximum Attenuation vs. Frequency
1.8
Attenuation (dB)
-10
1.6 Output
VSWR
-15 -20 -25 -30 -35 -40 0.2 0.4 0.6 0.8 1.0 1.2
1.4 Input 1.2
1.0 0.2
0.4
0.6
0.8
1.0
1.2
VC (V)
VC (V)
Attenuation vs. Control Voltage
1.8 Maximum Attenuation 1.6 22
VSWR vs. Control Voltage
21
IIP3 (dBm)
VSWR
1.4 Minimum Attenuation 1.2
20
19
1.0 2.8 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
4.0
Frequency (GHz)
Frequency (GHz)
Output VSWR vs. Frequency
Input IP3 vs. Frequency
2
Alpha Industries, Inc. [978] 241-7000 • Fax [978] 241-7906 • Email sales@alphaind.com • www.alphaind.com
Specifications subject to change without notice. 1/02A
GaAs IC 25 dB Voltage Variable Attenuator 2.7–4.0 GHz
AV141-321
Evaluation Board Layout
QFN-12
0.118 (3.00 mm) PIN 1 INDICATOR 0.008 (0.20 mm) SEATING PLANE 0.001 (0.02 mm) 0.118 (3.00 mm)
SK39506 VVA Test Board
0.030 (0.75 mm) ± 0.002 (0.05 mm) PIN 1 INDICATOR
EXPOSED PAD
0.029 (0.73 mm)
0.009 (0.23 mm) + 0.003 (0.07 mm) - 0.002 (0.05 mm) 0.0196 (0.50 mm) BSC
0.057 (1.45 mm) SQ. + 0.004 (0.10 mm) - 0.006 (0.15 mm)
Pin Out
N/C N/C
11 12 10
N/C J1 N/C
N/C
1 2 3
9 8 7
N/C J2 N/C
4
5
N/C
Ground is connected to paddle on bottom.
Typical S-Parameters (Control Voltage 0/+1.2 V)
Insertion Loss State # GHZ S MA R 50 Freq. (GHz) 2.5 3.0 3.5 4.0 S11 0.330 0.242 0.165 0.070 S11a 66.05 18.19 -33.76 -68.30 S21 S21a S12 S12a S22 S22a 45.02 -22.04 -94.37 High Attenuation State # GHZ S MA R 50 S11 0.160 S11a 5.13 S21 0.074 0.021 S21a 126.57 46.26 S12 0.074 0.021 S12a 126.20 46.12 S22 0.161 0.172 S22a -18.79 -71.10
0.887 -135.38 0.913 0.914 -175.58 0.946 0.913 144.77 0.916 103.60 0.951 0.959
VC
N/C
6
-135.67 0.312 -175.25 0.210 144.79 103.52 0.145
0.129 -40.89 0.152 -97.28 0.134 -151.61
0.026 -107.80 0.026 -107.54 0.209 -118.44 0.046 -178.59 0.047 -179.41 0.224 -161.45
0.080 -152.16
Measured S-Parameters include the evaluation board.
Alpha Industries, Inc. [978] 241-7000 • Fax [978] 241-7906 • Email sales@alphaind.com • www.alphaind.com
Specifications subject to change without notice. 1/02A
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