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