3 Volt Voltage Variable Attenuator 25 dB, DC-2.5 GHz Features • • • • • AT-255 V7 Functional Schematic 1 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 1. VC = -3 V to 0 V @ 25 µA maximum. Pin Configuration Ordering Information Part Number Package AT-255 SOT-25 Plastic AT-255TR 1000 piece reel Note: Reference Application Note M513 for reel size information. Pin No. Function Pin No. Function 1 RF Port 4 Ground 2 Ground 5 VC 3 RF Port Absolute Maximum Ratings 2 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 2. Exceeding any one or combination of these limits may cause permanent damage to this device. 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. 3 Volt Voltage Variable Attenuator 25 dB, DC-2.5 GHz AT-255 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 3 3. Insertion loss varies 0.003 dB/°C. SOT-25 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. 3 Volt Voltage Variable Attenuator 25 dB, DC-2.5 GHz AT-255 V7 Typical Performance Curves Relative Attenuation vs. Control Voltage 50MHz 1.0GHz Insertion Loss vs. Frequency +25C 2.5GHz 35 Insertion Loss (dB) 30 Attenuation (dB) +85C -40C 4 25 20 15 10 3 2 1 5 0 0 -3.0 -2.5 -2.0 -1.5 -1.0 -0.5 0.0 0.0 0.5 +85C -40C S11 35 2.0 2.5 3.0 -0.5 0.0 -0.5 0.0 S22 0 S11, S22 (dB) 30 Attenuation (dB) 1.5 Return Loss vs. Control Voltage @ 900 MHz Maximum Relative Attenuation vs. Frequency +25C 1.0 Frequency (GHz) Control Voltage (V) 25 20 15 10 -5 -10 -15 -20 5 -25 -3.0 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 -2.5 Input IP3 vs. Control Voltage 50MHz 500MHz 500MHz 35 Compression Point (dBm) 25 IP3 (dBm) -1.0 Input P1dB vs. Control Voltage 30 20 15 10 5 0 -3.0 -1.5 Control Voltage (V) Frequency (GHz) 50MHz -2.0 -2.5 -2.0 -1.5 -1.0 -0.5 0.0 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. 30 25 20 15 10 5 0 -3.0 -2.5 -2.0 -1.5 -1.0 Control Voltage (V) • 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.