Voltage Variable Absorptive Attenuator, 35 dB 0.5 - 2 GHz AT-109 V 2.00 Features SO-8 Single Positive Voltage Control 0 to +5 Volts 35 dB Attenuation Range at 0.9 GHz ● ±2 dB Linearity from BSL ● Low DC Power Consumption ● Temperature Range: -40°C to +85°C ● Low-Cost SOIC 8 Plastic Package ● Tape and Reel Packaging Available ● ● Description M/A-COM’s AT-109 is a GaAs MMIC voltage variable absorptive attenuator in a low-cost SOIC 8-lead surface mount plastic package. The AT-109 is more linear than the higher attenuation range AT-108. The AT-109 is ideally suited for use where linear attenuation fine tuning and very low power comsumption are required. Typical applications include radio, cellular, GPS equipment and automatic gain/level control circuits. The AT-109 is fabricated with a monolithic GaAs MMIC using a mature 1-micron process. The process features full chip passivation for increased performance and reliability. Ordering Information * Part No. AT-109 Package SOIC 8-Lead Plastic Package AT-109TR Forward Tape & Reel* AT-109RTR Reverse Tape & Reel* If specific reel size is required, consult factory for part number assignment. Electrical Specifications1, TA = +25°C Parameter Insertion Loss Attenuation Flatness (Peak-to-Peak) VSWR Trise, Tfall Ton, Toff Transients Test Conditions 1 Min. 0.5 - 1.0 GHz 1.0 - 2.0 GHz Unit dB dB 0.5 - 1.0 GHz 1.0 - 2.0 GHz 0.5 - 1.0 GHz 1.0 - 2.0 GHz dB dB dB dB 35 30 10% to 90% RF, 90% to 10% RF 50% Control to 90% RF, Control to 10% RF In-band mS mS mV Typ. 2.5 3.2 Max 2.7 3.5 ±0.5 ±1.2 ±0.8 ±1.5 2:1 25 35 12 1. All measurements at 1 GHz in a 50-V system, unless otherwise specified.The RF ports must be blocked outside of the package from ground or any other voltage. Voltage Variable Absorptive Attenuator, 35 dB AT-109 V 2.00 Functional Schematic Absolute Maximum Ratings1 Parameter Absolute Maximum Maximum Input Power Supply Voltage VCC Control Voltage VCC Operating Temperature Storage Temperature +21 dBm -1 V, +8 V -1 V, VCC + 0.5 V -40°C to +85°C -65°C to +150°C 1. Operation of this device above any one of these parameters may cause permanent damage. VCC = +5 VDC ±0.5 VDC @ 50 µA max. VC = 0 VDC to +5 VDC @ 50 µA max. External DC blocking capacitors are required on all RF ports. Typical Performance ATTENUATION vs CONTROL VOLTAGE @ +25°C, F = 1800 MHz INSERTION LOSS vs FREQUENCY 4.0 0 -5 3.0 -10 2.0 -15 -20 1.0 -25 -30 0 0.5 -35 5 4 3 2 1 1.0 0 1.5 2.0 FREQUENCY (GHz) CONTROL VOLTAGE (VOLTS) RELATIVE ATTENUATION @ +25°C, F = 900 MHz vs CONTROL VOLTAGE 0 ATTENUATION vs TEMPERATURE, NORMALIZED TO +25°C, F = 900 MHz 3.5 -10 2.5 -20 1.5 -40°C +85°C 0.5 -30 -0.5 -40 5 4 3 2 CONTROL VOLTAGE (VOLTS) 1 0 -1.5 5 4 3 2 1 CONTROL VOLTAGE (VOLTS) 0 Voltage Variable Absorptive Attenuator, 35 dB AT-109 V 2.00 RETURN LOSS vs CONTROL VOLTAGE @ +25°C, F = 900 MHz 1 dB COMPRESSION vs CONTROL VOLTAGE @ +25°C, F = 900 MHz 0 25 -10 20 15 -20 10 -30 5 -40 5 4 3 2 1 0 CONTROL VOLTAGE (VOLTS) 35 IP3 vs CONTROL VOLTAGE 900 MHz 25 20 400 MHz 15 10 5 0 4 3 2 CONTROL VOLTAGE (VOLTS) 1 5 4 3 2 CONTROL VOLTAGE (VOLTS) 30 5 0 0 1 0