AT-255 3 Volt Voltage Variable Attenuator 25 dB, DC - 2.5 GHz Functional Schematic 3 Features • • • • • Rev. V7 Single Voltage Control: 0 to -3 Volts 25 dB Attenuation Range at 0.9 GHz Low DC Power Consumption SOT-25 Plastic Package Tape and Reel Packaging Available Vc GND 5 4 Description M/A-COM’s AT-255 is a GaAs MMIC voltage variable absorptive attenuator in a low cost SOT-25 surface mount plastic package. The AT-255 is ideally suited for use where variable 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-255 is fabricated using a mature 1-micron GaAs MESFET process. The process features full chip passivation for increased performance and reliability. 1 2 3 RF GND RF 3. VC = -3 V to 0 V @ 25 µA maximum. Pin Configuration Ordering Information 1,2 Part Number Package AT-255 Bulk Package AT-255TR 1000 piece reel AT-255SMB Sample Board 1. Reference Application Note M513 for reel size information. 2. All sample boards include 5 loose parts. Pin No. Function Pin No. Function 1 RF Port 4 Ground 2 Ground 5 VC 3 RF Port Absolute Maximum Ratings 4 Parameter Absolute Maximum Input Power +21 dBm Control Voltage VC -8 V to +0.5 V Operating Temperature -40°C to +85°C Storage Temperature -65°C to +150°C 4. Exceeding any one or combination of these limits may cause permanent damage to this device. 1 ADVANCED: Data Sheets contain information regarding a product M/A-COM Technology Solutions • North America Tel: 800.366.2266 / Fax: 978.366.2266 is considering for development. Performance is based on target specifications, simulated results, • Europe Tel: 44.1908.574.200 / Fax: 44.1908.574.300 and/or prototype measurements. Commitment to develop is not guaranteed. • Asia/Pacific Tel: 81.44.844.8296 / Fax: 81.44.844.8298 PRELIMINARY: Data Sheets contain information regarding a product M/A-COM Technology Visit www.macomtech.com for additional data sheets and product information. Solutions has under development. Performance is based on engineering tests. Specifications are typical. Mechanical outline has been fixed. Engineering samples and/or test data may be available. M/A-COM Technology Solutions Inc. and its affiliates reserve the right to make Commitment to produce in volume is not guaranteed. changes to the product(s) or information contained herein without notice. AT-255 3 Volt Voltage Variable Attenuator 25 dB, DC - 2.5 GHz Rev. V7 Electrical Specifications: TA = 25°C, Z0 = 50 Ω Parameter Test Conditions Units Min. Typ. Max. DC—2.0 GHz dB — 3.6 4.2 Attenuation DC—1.0 GHz 1.0—2.0 GHz dB dB 23 18 25 20 — — Flatness (Peak-to-Peak) 0.5—1.0 GHz 1.0—2.0 GHz dB dB — +7 +5 + 10 +8 VSWR DC—2.0 GHz Ratio — 3:1 — Trise, Tfall 10% to 90% RF, 90% to 10% RF nS — 10 — Ton, Toff 50% Control to 90% RF,50% Control to 10% RF nS — 20 — Transients In Band mV — 10 — Insertion Loss 5 5. Insertion loss varies 0.003 dB/°C. SOT-25 † † Meets JEDEC moisture sensitivity level 1 requirements. 2 ADVANCED: Data Sheets contain information regarding a product M/A-COM Technology Solutions • North America Tel: 800.366.2266 / Fax: 978.366.2266 is considering for development. Performance is based on target specifications, simulated results, • Europe Tel: 44.1908.574.200 / Fax: 44.1908.574.300 and/or prototype measurements. Commitment to develop is not guaranteed. • Asia/Pacific Tel: 81.44.844.8296 / Fax: 81.44.844.8298 PRELIMINARY: Data Sheets contain information regarding a product M/A-COM Technology Visit www.macomtech.com for additional data sheets and product information. Solutions has under development. Performance is based on engineering tests. Specifications are typical. Mechanical outline has been fixed. Engineering samples and/or test data may be available. M/A-COM Technology Solutions Inc. and its affiliates reserve the right to make Commitment to produce in volume is not guaranteed. changes to the product(s) or information contained herein without notice. AT-255 3 Volt Voltage Variable Attenuator 25 dB, DC - 2.5 GHz Rev. V7 Typical Performance Curves Relative Attenuation vs. Control Voltage Insertion Loss vs. Frequency 35 4 30 3 25 20 +25°C -40°C +85°C 2 15 50 MHz 1 GHz 2.5 GHz 10 1 5 0 -3.0 -2.5 -2.0 -1.5 -1.0 -0.5 0 0.0 0.0 0.5 Control Voltage (V) 1.0 1.5 2.0 2.5 3.0 Frequency (GHz) Maximum Relative Attenuation vs. Frequency Return Loss vs. Control Voltage @ 900 MHz 35 0 -5 30 +25°C -40°C +85°C -10 25 -15 20 -20 15 0.0 0.5 1.0 1.5 2.0 2.5 -25 -3.0 3.0 -2.5 Frequency (GHz) Input IP3 vs. Control Voltage 50M Hz -2.0 -1.5 -1.0 -0.5 0.0 Control Voltage (V) Input P1dB vs. Control Voltage 50M Hz 500M Hz 500M Hz 35 30 30 25 25 20 20 15 15 10 10 5 0 -3.0 5 -2.5 -2.0 -1.5 -1.0 C o nt ro l Vo ltage (V) -0.5 0.0 0 -3.0 -2.5 -2.0 -1.5 -1.0 -0.5 0.0 C o nt ro l V o lt a ge ( V ) 3 ADVANCED: Data Sheets contain information regarding a product M/A-COM Technology Solutions • North America Tel: 800.366.2266 / Fax: 978.366.2266 is considering for development. Performance is based on target specifications, simulated results, • Europe Tel: 44.1908.574.200 / Fax: 44.1908.574.300 and/or prototype measurements. Commitment to develop is not guaranteed. • Asia/Pacific Tel: 81.44.844.8296 / Fax: 81.44.844.8298 PRELIMINARY: Data Sheets contain information regarding a product M/A-COM Technology Visit www.macomtech.com for additional data sheets and product information. Solutions has under development. Performance is based on engineering tests. Specifications are typical. Mechanical outline has been fixed. Engineering samples and/or test data may be available. M/A-COM Technology Solutions Inc. and its affiliates reserve the right to make Commitment to produce in volume is not guaranteed. changes to the product(s) or information contained herein without notice.