Preliminary GaAs IC 5 Bit Digital Attenuator with Driver 1 dB LSB Positive Control DC–2 GHz AA110-85 Features SSOP-20 ■ Attenuation 1 dB Steps to 31 dB With High Accuracy ■ Single Positive Control (+5 V) for Each Bit ■ Low DC Power Consumption PIN 20 0.209 (5.30 mm) ±0.012 (0.30 mm) PIN 1 INDICATOR PIN 1 ■ CMOS Integrated Silicon Driver ■ Designed for Use at IF Frequencies Description The AA110-85 is a 5 bit, single positive control GaAs IC FET digital attenuator with driver. It is particularly suited at IF frequencies where high attenuation accuracy, low insertion loss and low intermodulation products are required. Typical applications include base station, wireless data, broadband and wireless local loop gain control circuits. 0.069 (1.75 mm) ±0.004 (0.10 mm) 0.307 (7.80 mm) ±0.016 (0.307 mm) 0.283 (7.20 mm) ±0.012 (0.30 mm) 0.0256 0.078 (0.65 mm) (2.00 mm) BSC MAX. 0.012 (0.30 mm) REF. 0.010 (0.25 mm) 0.004 (0.090 mm) 8˚ MAX. 0.008 (0.20 mm) MAX. 0.002 (0.05 mm) MIN. 0.030 (0.75 mm) ±0.008 (0.10 mm) Electrical Specifications at 25°C (0, +5 V) Parameter1 Insertion Frequency Loss2 Min. Typ. Max. Unit DC–0.5 GHz DC–1.0 GHz DC–2.0 GHz 1.4 1.7 2.2 1.7 2.1 2.6 dB dB dB DC–0.5 GHz ± (0.2 + 2% of Attenuation Setting in dB) ± (0.25 + 3% of Attenuation Setting in dB) ± (0.4 + 6% of Attenuation Setting in dB) Attenuation Range 31 Attenuation Accuracy3 DC–1.0 GHz DC–2.0 GHz VSWR (I/O)4 DC–2.0 GHz dB 1.5:1 1.8:1 Typ. Max. dB dB dB Operating Characteristics at 25°C (0, +5 V) Parameter Condition Frequency Switching Characteristics5 Rise, Fall (10/90% or 90/10% RF) On, Off (50% CTL to 90/10% RF) Video Feedthru Input Power for 1 dB Compression VCC = +5 V 0.5–2.0 GHz 0.05 GHz Intermodulation Intercept Point (IP3) For Two-tone Input Power +5 dBm VCC = +5 V 0.5–2.0 GHz 0.05 GHz Supply Voltage VCC = 5 V @ 700 µA Typ. Control Voltages CTL1, CTL2, CTL4, CTL8, CTL16, Low = 0 to 0.8 V @ 20 µA Typ. CTL1, CTL2, CTL4, CTL8, CTL16, High = 3.5 to 5.0 V @ 20 µA Typ. 1. All measurements made in a 50 Ω system, unless otherwise specified. 2. Insertion loss changes by 0.003 dB/°C. 3. Attenuation referenced to insertion loss. Min. Unit 30 50 50 ns ns mV +25 +18 +29 +22 dBm dBm +42 +30 +48 +36 dBm dBm 4. Input/output. 5. Video feedthru measured with 1 ns risetime pulse and 500 MHz bandwidth. Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email [email protected] • www.alphaind.com Specifications subject to change without notice. 2/01A 1 GaAs IC 5 Bit Digital Attenuator with Driver 1 dB LSB Positive Control DC–2 GHz AA110-85 Typical Performance Data (VCC = +5 V) -1.0 2.0 1.8 -1.4 VSWR Insertion Loss (dB) -1.2 -1.6 1.4 Ins. Loss 1 dB 2 dB -1.8 1.2 -2.0 -2.2 1.0 0 0.5 1.0 1.5 0 2.0 0.5 16 dB 4 dB 31 dB 8 dB 1.0 1.5 Frequency (GHz) Frequency (GHz) Insertion Loss vs. Frequency VSWR vs. Frequency 2.0 Absolute Maximum Ratings 1.5 Deviation from Nominal Attenuation (dB) 1.6 Characteristic 1.0 Value RF Input Power 2 W > 500 MHz, 0/6 V 0.5 W > 50 MHz, 0/6 V 0.5 1 dB 16 dB 8 dB 4 dB 0 Supply Voltage 6V Control Voltage1 2 dB -0.5 31 dB -1.0 -0.2 V, +6 V Operating Temperature -40°C to +85°C Storage Temperature -65°C to +150°C ΘJC -1.5 0 0.5 1.0 1.5 2.0 85°C/W Note: Exceeding these ratings may cause irreversible damage. 1. Control voltage must not exceed supply voltage. Frequency (GHz) Attenuation Accuracy vs. Frequency Pin Out 1 0 0 0 2 dB 0 0 1 0 0 4 dB 0 0 0 1 0 8 dB 0 0 0 0 1 16 dB 1 1 1 1 1 31 dB GND GND J2 11 0 GND 12 1 dB 13 0 14 0 15 0 16 0 17 1 18 Ins. Loss 19 0 20 0 10 0 9 0 8 0 7 CTL16 6 CTL8 5 CTL4 4 CTL2 GND GND GND 3 CTL1 Attenuation J1–J2 2 Truth Table 1 J1 GND GND N/C CTL1 CTL2 CTL4 CTL8 (Negative Voltage CTL16 Holding Capacitor) VSS 0.01 µF C2 0.025 µF C1 (Charge Pump Capacitor) VCC 0.01 µF (Power Supply Bypass Capacitor) “0” = 0 to 0.8 V (VCC = 5 V). “1” = 3.5 to 5 V (VCC = 5 V). 2 Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email [email protected] • www.alphaind.com Specifications subject to change without notice. 2/01A