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| 3 Volt Voltage Variable Attenuator 25 dB, DC-2.5 GHz Features * * * * * 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 AT-255 V7 Functional Schematic 1 Vc 5 GND 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 RF 2 GND 3 RF 1. VC = -3 V to 0 V @ 25 A maximum. Pin Configuration Pin No. 1 2 Function RF Port Ground RF Port Pin No. 4 5 Function Ground VC Ordering Information Part Number AT-255 AT-255TR Package SOT-25 Plastic 1000 piece reel 3 Absolute Maximum Ratings 2 Parameter Input Power Control Voltage VC Operating Temperature Storage Temperature Absolute Maximum +21 dBm -8 V to +0.5 V -40C to +85C -65C to +150C Note: Reference Application Note M513 for reel size information. 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 Electrical Specifications: TA = 25C, Z0 = 50 Parameter Insertion Loss Attenuation Flatness (Peak-to-Peak) VSWR Trise, Tfall Ton, Toff Transients 3. Insertion loss varies 0.003 dB/C. 3 AT-255 V7 Test Conditions DC--2.0 GHz DC--1.0 GHz 1.0--2.0 GHz 0.5--1.0 GHz 1.0--2.0 GHz DC--2.0 GHz 10% to 90% RF, 90% to 10% RF 50% Control to 90% RF, 50% Control to 10% RF In Band Units dB dB dB dB dB Ratio nS nS mV Min -- 23 18 -- -- -- -- -- Typ 3.6 25 20 +7 +5 3:1 10 20 10 Max 4.2 -- -- + 10 +8 -- -- -- -- 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 Typical Performance Curves Relative Attenuation vs. Control Voltage 50MHz 35 1.0GHz 2.5GHz AT-255 V7 Insertion Loss vs. Frequency +25C 4 +85C -40C Insertion Loss (dB) 30 Attenuation (dB) 25 20 15 10 5 0 -3.0 3 2 1 0 -2.5 -2.0 -1.5 -1.0 -0.5 0.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Control Voltage (V) Frequency (GHz) Maximum Relative Attenuation vs. Frequency +25C 35 30 +85C -40C Return Loss vs. Control Voltage @ 900 MHz S11 0 -5 -10 -15 -20 -25 -3.0 S22 Attenuation (dB) 25 20 15 10 5 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 S11, S22 (dB) -2.5 -2.0 -1.5 -1.0 -0.5 0.0 Frequency (GHz) Control Voltage (V) Input IP3 vs. Control Voltage 50MHz 30 500MHz 35 Input P1dB vs. Control Voltage 50MHz 500MHz Compression Point (dBm) -2.5 -2.0 -1.5 -1.0 -0.5 0.0 25 30 25 20 15 10 5 0 -3.0 IP3 (dBm) 20 15 10 5 0 -3.0 -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. 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. |
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