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| AT-255 3Volt 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 Low Cost SOT-25 Plastic Package Tape and Reel Packaging Available SOT-25 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. Note: 1. Leads Coplanarity should be 0.003 (0.08) max. 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. DIM A B C D E F G H J Ordering Information Part Number AT-255 AT-255TR Package SOT-25 Plastic Forward Tape and Reel1 INCHES MIN MAX .106 .122 .100 .118 .051 .063 REF. .032 .043 .014 .020 .003 .000 .006 .018 REF. MILLIMETERS MIN MAX 2.70 3.10 2.54 3.00 1.30 1.60 REF. .80 1.10 .35 .50 .08 .00 .15 .45 REF 1. Reference Application Note M513 for reel size information. Electrical Specifications: TA = +25C1= Parameter Insertion Loss Attenuation Flatness (Peak-to-Peak) VSWR Trise, Tfall Ton, Toff Transients 1. Test Conditions DC - 2.0 GHz DC - 1.0 GHz 1.0 - 2.0 GHz DC - 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, Control to 10% RF In-band Units dB dB dB dB dB nS nS mV Min. 23 18 Typ. 3.6 25 20 7 5 3:1 10 20 10 Max. 4.2 10 8 All measurements at 1 GHz in a 50 system unless otherwise specified. Insertion Loss varies 0.003 dB/C. Specifications subject to change without notice. North America: Tel. (800) 366-2266, Fax (800) 618-8883 Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298 Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020 Visit www.macom.com for additional data sheets and product information. V 4.0 1 3 Volt Voltage Variable Attenuator, 25 dB, DC - 2.5 GHz Absolute Maximum Ratings1 Parameter Maximum Input Power Control Voltage VC Operating Temperature Storage Temperature 1. AT-255 Functional Schematic1 +21 dBm -8V, +0.5V -40C to +85C -65C to +150C Absolute Maximum Vc 5 GND 4 Exceeding any one or a combination of these limits may cause permanent damage. 1. 1 RF 2 GND 3 RF VCC = 0 VDC to -3 VDC @ 50 A max. Typical Performance Curves 0 ATTENUATION (dB) -5 -10 -15 -20 -25 -30 -35 -3 -2 -1 CONTROL VOLTAGE (VOLTS) 0 1.0GHz 50MHz -4 0 1 2 FREQUENCY(GHz) 3 4 Relative Attenuation vs. Control Voltage ATTENUATION(dB) RETURN LOSS (dB) 0 -1 -2 -3 Insertion Loss vs. Frequency 2.5GHz 0 ATTENUATION(dB) -5 -10 -15 -20 -25 -30 -35 Q Maximum Relative Attenuation vs. Frequency 0 -5 -10 -15 -20 -25 Return Loss vs. Control @ 900 MHz 0 0.5 1 1.5 2 2.5 3 -3 FREQUENCY (GHz) -2 -1 CONTROL VOLTAGE (VOLTS) 0 COMPRESSION POINT (dBm) 45 40 35 30 25 20 15 10 5 0 Input IP3 vs. CONTROL VOLTAGE INPUT IP3 vs Control Voltage 500 MHz 30 25 Input P1dB vs. Control Voltage 50MHz IP3 (dBm) 20 15 10 5 0 -3 -2 -1 CONTROL VOLTAGE (VOLTS) 0 500MHz 50MHz -3 -2 -1 CONTROL VOLTAGE (VOLTS) 0 Specifications subject to change without notice. North America: Tel. (800) 366-2266, Fax (800) 618-8883 Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298 Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020 Visit www.macom.com for additional data sheets and product information. V 4.0 2 |
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