GaAs IC 1 Bit Digital Attenuator 10 dB LSB DC–2.5 GHz AA103-72 Features SOT-5 ■ Attenuation Cutback of 10 dB 0.074 (1.90 mm) REF. ■ Single Positive 3 V Control 0.069 (1.75 mm) 0.052 (1.30 mm) ■ Low Loss ■ Low Cost SOT-5 Plastic Package PIN 1 0.020 (0.51 mm) 0.014 (0.35 mm) Description The AA103-72 is a 1 bit GaAs IC FET digital attenuator in a low cost package. This attenuator has an LSB of 10 dB. The AA103-72 is particularly suited where high attenuation accuracy, low insertion loss and low intermodulation products are required. Typical applications include cellular radio, wireless data, and wireless local loop gain level control circuits. 0.012 (0.30 mm) 0.000 (0.00 mm) MIN. 0.118 (3.00 mm) 0.087 (2.20 mm) 0.037 (0.95 mm) REF. 0.064 (1.63 mm) 0.035 (0.90 mm) 0.012 (0.30 mm) TYP. 0.024 (0.61 mm) 0.004 (0.10 mm) 0.0104 (0.26 mm) 0.0035 (0.09 mm) MIN. 0.122 (3.10 mm) 0.106 (2.70 mm) Electrical Specifications at 25°C (0, +3 V) Parameter1 Insertion Frequency Loss2 Min. Typ. Max. Unit DC–0.5 GHz DC–1.0 GHz DC–2.5 GHz 0.3 0.3 0.4 0.5 0.6 0.7 dB dB dB DC–1.0 GHz ± (0.25 + 3% of Attenuation Setting in dB) ± (0.4 + 5% of Attenuation Setting in dB) Attenuation Range 10 Attenuation Accuracy3 DC–2.5 GHz VSWR (I/O) DC–2.5 GHz dB 1.2:1 1.4:1 Typ. Max. dB dB Operating Characteristics at 25°C (0, +3 V) Parameter Condition Switching Characteristics4, 5 Rise, Fall (10/90% or 90/10% RF) On, Off (50% CTL to 90/10% RF) Video Feedthru Input Power for 1 dB Compression VS = +3 V VS = +5 V Intermodulation Intercept Point (IP3) For Two-tone Input Power +10 dBm VS = +3 V VS = +5 V Control Voltages Frequency Min. Unit 150 300 70 ns ns mV 0.5–2.5 GHz 0.5–2.5 GHz +20 +26 dBm dBm 0.5–2.5 GHz 0.5–2.5 GHz +41 +45 dBm dBm VLow = 0 to 0.2 V VHigh = +3 V @ 25 µA Typ. to +5 V @ 50 µA Typ. 1. All measurements made in a 50 Ω system, unless otherwise specified. 2. Insertion loss changes by 0.003 dB/°C. 3. Maximum attenuation includes insertion loss. 4. Video feedthru measured with 1 ns risetime pulse and 500 MHz bandwidth. 5. Switching characteristics will vary with value chosen for CBP. Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email [email protected] • www.alphaind.com Specifications subject to change without notice. 04/00A 1 GaAs IC 1 Bit Digital Attenuator 10 dB LSB DC–2.5 GHz AA103-72 1.0 1.8 0.9 1.7 0.8 1.6 0.7 0.6 VSWR Insertion Loss (S21, dB) Typical Performance Data (0, +3 V) 0.5 0.4 0.3 1.4 1.3 1.2 0.2 1.1 0.1 0.0 0.0 0.5 1.0 1.5 2.0 2.5 1.0 0.0 0.5 1.0 1.5 2.0 Frequency (GHz) Frequency (GHz) Insertion Loss vs. Frequency VSWR vs. Frequency 2.5 Absolute Maximum Ratings 13 Attenuation (S21, dB) 1.5 Characteristic 12 Value RF Input Power 1 W > 500 MHz 0/8 V 0.5 W @ 50 MHz 0/8 V 11 10 9 8 Supply Voltage +8 V Control Voltage -0.2 V, +8 V Operating Temperature -40°C to +85°C Storage Temperature -65°C to +150°C Note: Exceeding these parameters may cause irreversible damage. 7 0.0 0.5 1.0 1.5 2.0 2.5 Frequency (GHz) VHigh 0 Insertion Loss 0 VHigh Attenuation VHigh = +3 to +5 V (VS = VHigh ± 0.2 V). J2 4 J1–J2 CBP 3 V2 V2 V1 CBL 2 V1 1 RF GND Truth Table 2 J1 5 Attenuation vs. Frequency Pin Out CBL 10 10 kΩ VS DC blocking capacitors (CBL), bypass capacitor (CBP), and biasing resistor must be supplied externally for positive voltage operation. CBL, CBP = 33 pF for operation @ 900 MHz. Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email [email protected] • www.alphaind.com Specifications subject to change without notice. 04/00A