GaAs 30 dB IC Voltage Variable Dual Control Attenuator DC–4 GHz AT004N3-11 Features -11 ■ Dual Control Voltages ORIENTATION MARK ■ Low Insertion Loss ■ 8 Lead Hermetic Surface Mount Package ■ Capable of Meeting MIL-STD Requirements5 0.150 (3.81 mm) 0.050 (1.27 mm) TYP. Description The AT004N3-11 is a GaAs IC FET non-reflective bridged “T” attenuator. This device provides over 30 dB of “matched” attenuation with the input and output VSWR less than 1.5:1 under all attenuation values. The applications for these fast attenuators are AGC circuits and variable level control in high reliability and telecommunication systems. 0.180 (4.57 mm) SQ. MAX. 0.017 (0.43 mm) 0.013 (0.33 mm) 0.400 (10.16 mm) 0.380 (9.65 mm) 0.070 (1.78 mm) 0.040 (1.02 mm) 0.075 (1.91 mm) MAX. 0.006 (0.15 mm) 0.004 (0.10 mm) 0.250 (6.35 mm) 0.200 (5.08 mm) Electrical Specifications at 25°C Parameter1 Insertion Frequency4 Loss2 Min. DC–1.0 GHz DC–2.0 GHz DC–4.0 GHz Attenuation Range DC–1.0 GHz DC–2.0 GHz DC–4.0 GHz VSWR (I/O) DC–2.0 GHz DC–4.0 GHz 30 29 26 Typ. Max. Unit 0.8 1.0 1.2 1.0 1.2 1.4 dB dB dB 35 33 30 dB dB dB 1.25:1 1.40:1 1.3:1 1.5:1 Typ. Max. Operating Characteristics at 25°C Parameter Condition Switching Characteristics Rise, Fall (10/90% or 90/10% RF) On, Off (50% CTL to 90/10% RF) Video Feedthru3 Input Power for 1 dB Compression For All Attenuation Levels Control Voltages VLow = 0 to -0.2 V @ 20 µA Max. VHigh = -5 V @ 50 µA Max. Frequency 0.5–4 GHz 0.05 GHz Min. Unit 7 10 20 ns ns mV 0 -3 dBm dBm 1. All measurements made in a 50 Ω system, unless otherwise specified. 2. Insertion loss changes by 0.003 dB/°C. 3. Video feedthru measured with 1 ns risetime pulse and 500 MHz bandwidth. 4. DC = 300 kHz. 5. See Quality/Reliability section. Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email [email protected] • www.alphaind.com Specifications subject to change without notice. 3/99A 1 GaAs 30 dB IC Voltage Variable Dual Control Attenuator DC–4 GHz AT004N3-11 2.4 50 2.0 40 1.5 Attenuation (dB) Insertion Loss (dB) Typical Performance Data +85˚C 1.2 -55˚C 30 20 0.8 10 0.4 DC 1 2 3 0 DC 4 1 2 3 4 Frequency (GHz) Frequency (GHz) Insertion Loss vs. Frequency Attenuation (By State) vs. Frequency Typical Transfer Curve F = 1 GHz, VP1 = -3.5 V F = 50 MHz -1.0 V1 (Series) -2.0 -3.0 V2 (Shunt) -4.0 -5.0 0 10 5 20 PIN at 1.0 dB Compression (dBm) V1 V2 Control Voltages (V) 0 15 20 25 30 15 10 5 0 -5 0 35 5 10 15 20 25 Relative Attenuation (dB) Attenuation (dB) Relative Attenuation vs. Control Voltages Attenuation vs. 1.0 dB Compression Point Absolute Maximum Ratings Characteristic RF Input Power (RF In) Control Voltage (VC) Truth Table V1 V2 Attenuation J1–J2 0 -5 Insertion Loss -5 0 Full Attenuation Value 10 mW > 500 MHz 4 mW @ 50 MHz +0.2 V, -10 V Operating Temperature (TOP) -55°C to +125°C Storage Temperature (TST) -65°C to +150°C Thermal Resistance (ΘJC) 25°C/W Pin Out GND J1 GND V2 2 30 Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email [email protected] • www.alphaind.com Specifications subject to change without notice. 3/99A GND J2 GND V1