Voltage Variable Absorptive Attenuator 40 dB, 0.5-3.0 GHz Functional Schematic 1,2,3,4 Features • • • • • • AT-108 V6 Single Positive Voltage Control: 0 to +5 Volts 40 dB Attenuation Range at 900 MHz ± 2 dB Linearity from BSL Low DC Power Consumption SOIC-8 Plastic Package Tape and Reel Packaging Available 8 7 6 5 1 2 3 4 Description M/A-COM's AT-108 is a GaAs MESFET MMIC voltage variable absorptive attenuator in a low cost SOIC-8 surface mount plastic package. The AT-108 is ideally suited for use where linear attenuation, fine tuning and very low power consumption are required. Typical applications include radio, cellular, GPS equipment and automatic gain/level control circuits. The AT-108 is fabricated with a monolithic GaAs MMIC using a mature 1-micron process. The process features full chip passivation for increased performance and reliability. 1. Vcc = +5 VDC @ 50 µA maximum. 2. Vc = 0 VDC to +5 VDC @ 50 µA maximum. 3. External DC blocking capacitors are requirements on all RF ports. 4. 39 pF used for data measurements. Pin Configuration Ordering Information Pin No. Function Pin No. Function Part Number Package 1 Ground 5 VC AT-108 Bulk Packaging 2 Ground 6 Ground AT-108TR 1000 piece reel 3 RF Port 7 RF Port 4 VCC 8 Ground Note: Reference Application Note M513 for reel size information. Absolute Maximum Ratings 5,6 Parameter Absolute Maximum Input Power +21 dBm Supply Voltage VCC -1 V < VCC < +8 V Control Voltage VC -1 V < VC < VCC +0.5 V Operating Temperature -40°C to +85°C Storage Temperature -65°C to +150°C 5. Exceeding any one or combination of these limits may cause permanent damage to this device. 6. M/A-COM does not recommend sustained operation near these survivability limits. 1 M/A-COM Inc. and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. M/A-COM makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does M/A-COM assume any liability whatsoever arising out of the use or application of any product(s) or information. • North America Tel: 800.366.2266 / Fax: 978.366.2266 • Europe Tel: 44.1908.574.200 / Fax: 44.1908.574.300 • Asia/Pacific Tel: 81.44.844.8296 / Fax: 81.44.844.8298 Visit www.macom.com for additional data sheets and product information. Voltage Variable Absorptive Attenuator 40 dB, 0.5-3.0 GHz AT-108 V6 Electrical Specifications: TA = 25°C, Z0 = 50 Ω Parameter Test Conditions Units Min. Typ. Max. Insertion Loss 0.5 - 1.0 GHz 1.0 - 3.0 GHz dB dB — — 2.5 3.2 2.7 3.5 Attenuation 0.5 - 1.0 GHz 1.0 - 2.0 GHz 2.0 - 3.0 GHz dB dB dB 40 35 28 — — — — — — Flatness (peak-to-peak) 0.5 - 1.0 GHz 1.0 - 2.0 GHz 2.0 - 3.0 GHz dB dB dB — — — ± 0.5 ± 1.2 ± 1.5 ± 0.8 ± 1.5 ± 1.8 VSWR 0.5 - 3.0 GHz Ratio — 2:1 — Trise, Tfall 10% to 90% RF, 90% to 10% RF µS — 15 — Ton, Toff 50% Control to 90% RF, 50% Control to 10% RF µS — 25 — Transients In-Band mV — 12 — SOIC-8 2 M/A-COM Inc. and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. M/A-COM makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does M/A-COM assume any liability whatsoever arising out of the use or application of any product(s) or information. • North America Tel: 800.366.2266 / Fax: 978.366.2266 • Europe Tel: 44.1908.574.200 / Fax: 44.1908.574.300 • Asia/Pacific Tel: 81.44.844.8296 / Fax: 81.44.844.8298 Visit www.macom.com for additional data sheets and product information. Voltage Variable Absorptive Attenuator 40 dB, 0.5-3.0 GHz AT-108 V6 Typical Performance Curves @ 25°C Insertion Loss vs. Frequency Attenuation vs. Control Voltage 0 -1.6 -1.8 -10 -2.0 -20 -2.2 -30 -2.4 900 MHz 1800 MHz 2200 MHz -40 -2.6 -50 5 4 3 2 1 0 -2.8 0.0 0.5 Control Voltage (V) 1.0 1.5 2.0 2.5 3.0 Frequency (GHz) Return Loss vs. Control Voltage, F = 900 MHz 0 Return Loss vs. Control Voltage, F = 1800 MHz 0 -5 -5 S11 (dB) S22 (dB) -10 -10 -15 -15 -20 -20 -25 -25 -30 -30 -35 S11 (dB) S22 (dB) -35 5 4 3 2 1 5 0 4 Control Voltage (V) 3 2 1 0 2.5 3.0 Control Voltage (V) Return Loss vs. Control Voltage, F = 2200 MHz Maximum Attenuation vs. Frequency 0 0 -5 -10 -10 -20 -15 -20 -30 S11 (dB) S22 (dB) -25 -40 -30 -50 -35 5 4 3 2 1 0 Control Voltage (V) 3 M/A-COM Inc. and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. M/A-COM makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does M/A-COM assume any liability whatsoever arising out of the use or application of any product(s) or information. 0.5 1.0 1.5 2.0 Frequency (GHz) • North America Tel: 800.366.2266 / Fax: 978.366.2266 • Europe Tel: 44.1908.574.200 / Fax: 44.1908.574.300 • Asia/Pacific Tel: 81.44.844.8296 / Fax: 81.44.844.8298 Visit www.macom.com for additional data sheets and product information. Voltage Variable Absorptive Attenuator 40 dB, 0.5-3.0 GHz AT-108 V6 Typical Performance Curves @ 25°C 1 dB Compression vs. Control Voltage, F = 900 MHz IP3 vs. Control Voltage 25 35 20 30 400 MHz 900 MHz 25 15 20 10 15 5 10 0 5 -5 0 5 4 3 2 1 0 Control Voltage (V) 5 4 3 2 1 0 Control Voltage (V) Attenuation vs. Temperature Normalized to 25°C, F = 900 MHz 3 -40°C +85°C 2 1 0 -1 -2 5 4 3 2 1 0 Control Voltage (V) 4 M/A-COM Inc. and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. M/A-COM makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does M/A-COM assume any liability whatsoever arising out of the use or application of any product(s) or information. • North America Tel: 800.366.2266 / Fax: 978.366.2266 • Europe Tel: 44.1908.574.200 / Fax: 44.1908.574.300 • Asia/Pacific Tel: 81.44.844.8296 / Fax: 81.44.844.8298 Visit www.macom.com for additional data sheets and product information.