GaAs 4 Bit Digital Attenuator 2, 4, 8, 16 dB Bits DC–2 GHz AT002D4-31 Features -31 ■ Low DC Power Consumption ■ Attenuation in 2 dB Steps to 30 dB with High Accuracy ORIENTATION MARK 0.270 (6.86 mm) MAX. 0.050 (1.27 mm) 0.395 (10.03 mm) MAX. ■ 14 Lead Hermetic Surface Mount Package ■ Capable of Meeting MIL-STD Requirements6 0.017 (0.43 mm) 0.500 (12.70 mm) MAX. Description The AT002D4-31 is an MMIC FET digital attenuator consisting of four monolithic attenuators with an LSB of 2 dB and a total attenuation of 30 dB with all attenuators connected. This attenuator is recommended for fast response, low power consumption AGC circuits. Typical applications include AGC circuits for radar processing, instrumentation and levelers in RF equipment. 0.006 (0.15 mm) 0.004 (0.10 mm) 0.070 (1.78 mm) 0.040 (1.02 mm) 0.075 (1.91 mm) MAX. 0.340 (8.64 mm) 0.315 (8.00 mm) 0.038 (0.97 mm) 0.025 (0.64 mm) Electrical Specifications at 25°C Parameter1 Frequency5 Insertion Loss2 DC–0.5 GHz DC–1.0 GHz DC–2.0 GHz Attenuation Range3 DC–1.0 GHz DC–2.0 GHz Attenuation Accuracy Per Bit DC–1.0 GHz DC–2.0 GHz VSWR Min. 28 26 Typ. Max. Unit 2.6 3.3 5.0 3.0 3.9 5.8 dB dB dB 30 30 dB dB ± (0.4 + 5% of Attenuation Setting in dB) ± (0.5 + 5% of Attenuation Setting in dB) DC–0.5 GHz DC–2.0 GHz 1.3:1 1.6:1 1.5:1 1.8:1 Typ. Max. Operating Characteristics at 25°C Parameter Switching Characteristics Condition Frequency Rise, Fall (10/90% or 90/10% RF) On, Off (50% CTL to 90/10% RF) Video Feedthru4 Input Power for 1 dB Compression Intermodulation Intercept Point (IP3) For Two-tone Input Power 13 dBm Control Voltages VLow = 0 to -0.2 V @ 20 µA Max. VHigh = -5 V @ 50 µA to -9 V @ 200 µA Max. 1. All measurements made in a 50 Ω system, unless otherwise specified. 2. Insertion loss changes by 0.003 dB/°C. 3. Attenuation value referenced above insertion loss. Min. Unit 7 14 20 ns ns mV 0.5–2 GHz 27 dBm 0.5–2 GHz 0.001–0.5 GHz 43 32 dBm dBm 4. Video feedthru measured with 1 ns risetime pulse and 500 MHz bandwidth. 5. DC = 300 kHz. 6. See Quality/Reliability section. Alpha Industries, Inc. [781] 935-5150 • Fax [978] 241-7906 • Email [email protected] • www.alphaind.com Specifications subject to change without notice. 9/01A 1 GaAs 4 Bit Digital Attenuator 2, 4, 8, 16 dB Bits DC–2 GHz AT002D4-31 Typical Performance Data 3.5 30 30 dB ± 1.0 +85˚C 20 2.5 Attenuation (dB) Insertion Loss (dB) 3.0 -55˚C 2.0 16 dB ± 0.6 15 10 8 dB ± 0.4 5 4 dB ± 0.4 0 2 dB ± 0.3 1.5 1.0 DC 0.2 0.4 0.6 0.8 1.0 2.0 DC 0.2 0.4 0.6 0.8 1.0 Frequency (GHz) Insertion Loss vs. Frequency Attenuation vs. Frequency by BIT Absolute Maximum Ratings 2.5 Characteristic 2.2 RF Input Power (RF In) 1.9 Control Voltage (VC) 1.6 1.3 Value 2 W > 500 MHz 0/-8 V 0.5 W @ 50 MHz 0/-8 V +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 1.0 DC 0.2 0.4 0.6 0.8 1.0 3.0 Pin Out Frequency (GHz) VSWR vs. Frequency (All States) Truth Table V1 V2 V3 2 dB 2 2.0 Frequency (GHz) V4 V5 4 dB V6 V7 8 dB V8 16 dB Condition J1–J2 -5 0 -5 0 0 -5 -5 0 Insertion Loss 0 -5 -5 0 0 -5 -5 0 2 dB State -5 0 0 -5 0 -5 -5 0 4 dB State -5 0 -5 0 -5 0 -5 0 8 dB State -5 0 -5 0 0 -5 0 -5 16 dB State 0 -5 0 -5 -5 0 0 -5 30 dB Max. Atten. V7 V8 V6 GND V5 J1 V4 GND V3 GND V2 GND V1 J2 Alpha Industries, Inc. [781] 935-5150 • Fax [978] 241-7906 • Email [email protected] • www.alphaind.com Specifications subject to change without notice. 9/01A