AT-108 Voltage Variable Absorptive Attenuator 40 dB, 0.5— 0.5 — 3.0 GHz SOIC-81 Features • • • • • • Single Positive Voltage Control 0 to +5 Volts 40 dB Attenuation Range at 900 MHZ GHz ± 2 dB Linearity from BSL Low DC Power Consumption Low-Cost SOIC-8 Plastic Package Tape and Reel Packaging Available PIN 8 .1497/.1574 (3.80/4.00) -B- Oreintation Mark .2284/.2440 (5.80/6.20) .010(.25)M B M PIN 1 .1890/.1968 (4.80/5.00) -A.0040/.0098 (.10/.25) .0532/.0688 (1.35/1.75) Description M/A-COM’s AT-108 is a GaAs, MESFET MMIC voltage variable absorptive attenuator in a low cost SOIC-8 lead surface mount plastic package. The AT-108 is ideally suited for use where linear 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-108 is fabricated with a monolithic GaAs MMIC using a mature 1-micron process. The process features full chip passivation for increased performance and reliability. CHAMFER (OPTIONAL ) 0°/80° -C- .004(0.10) .013/.020 (8 (.33/.51) PL) .010(.25)M C A M B S .050(1.27)BSC. .016/.050 (0.40/1.27) .0075/.0098 (.19/.25) 1. Dimensions are in inches/mm. Ordering Information Part Number Package AT-108 SOIC-8 Lead Plastic Package AT-108TR Forward Tape and Reel1 AT-108RTR Reverse Tape and Reel1 1. If specific reel size is required, consult factory for part number assignment. Electrical Specifications: TA = 25°C1= Parameter Insertion Loss Attenuation Flatness (Peak-to-Peak) VSWR Trise, Tfall Ton, Toff Transients 1. Test Conditions1 0.5 - 1.0 GHz 1.0 - 3.0 GHz 0.5 - 1.0 GHz 1.0 - 2.0 GHz 2.0 - 3.0 GHz 0.5 - 1.0 GHz 1.0 - 2.0 GHz 2.0 - 3.0 GHz 0.5 - 3.0 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 dB dB dB µs µs mV Min. Typ. 2.5 3.2 Max. 2.7 3.5 ±0.5 ±1.2 ±1.5 2:1 15 25 12 ±0.8 ±1.5 ±1.8 40 35 28 All measurements in a 50Ω system. Specifications subject to change without notice. V 4.0 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. Voltage Variable Absorptive Attenuator, 40 dB, 0.5-3.0 GHz Absolute Maximum Ratings1 Parameter Functional Schematic Absolute Maximum Maximum Input Power +21 dBm Supply Voltage VCC -1V, +8V Control Voltage VC -1V, VCC + 0.5V Operating Temperature -40°C to +85°C Storage Temperature -65°C to +150°C 1. AT-108 Operation of this device above any one of these parameters may cause permanent damage. GND RF GND Vc 8 7 6 5 1 2 3 4 GND GND RF V cc PIN Orientation Mark 1. 2. 3. 4. VCC = +5 VDC @ 50 µA max. VC = 0 VDC to +5 VDC @ 50 µA max. External DC blocking capacitors are required on all RF ports. 39pF used for data measurements. Typical Performance Curves Attenuation vs. Control Voltage @ +25°C 0 -1.6 2200MHz -1.8 -10 Insertion Loss (dB) -15 1800MHz -20 -25 -30 900MHz -35 -40 -45 -50 -2 -2.2 -2.4 -2.6 2.84 2.69 0 -5 -5 Return Loss (dB) Return Loss (dB) 2.53 Return Loss vs. Control Voltage @ +25°C F = 1800 MHz 0 Output RL -15 -20 -25 2.38 Frequency (GHz) Return Loss vs. Control Voltage @ +25°C F = 900 MHz -10 2.22 Control Voltage (Volts) 2.06 0 1.91 0.5 1.75 1 1.6 1.5 1.44 2 1.28 2.5 1.13 3 0.97 3.5 0.82 4 0 4.5 0.66 -2.8 5 0.5 Attenuation (dB) -5 Insertion Loss vs. Frequency Input RL Input RL Output RL -10 -15 -20 -30 -25 -35 5 4.5 4 3.5 3 2.5 2 1.5 Control Voltage (Volts) 1 0.5 0 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 Control Voltage (Volts) Specifications subject to change without notice. V 4.0 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. Voltage Variable Absorptive Attenuator, 40 dB, 0.5-3.0 GHz AT-108 Typical Performance Curves (Cont’d) Attenuation vs. Control Voltage Typical Device Deviation f = 900 MHz @ +25°C Return Loss vs. Control Voltage @ +25°C F = 2200 MHz 0 Return Loss (dB) -4 Attenuation (dB) -2 Output Return Loss Input Return Loss -6 -8 -10 -12 -14 -16 -18 -20 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 -5 -10 -15 -20 -25 -30 -35 -40 -45 -50 5 0 4.5 4 3 2.5 2 1.5 1 0.5 0 Attenuation vs. Control Voltage Typical Device Deviation F = 1800 MHz @ +25°C Maximum Attenuation vs. Frequency 0 -20 -5 Attenuation (dB) -25 -30 -35 -40 -45 -10 -15 -20 -25 -30 -35 -40 -50 2.9 2.74 2.58 2.43 2.27 2.12 1.8 1.96 1.65 1.49 1.34 1.18 1.02 0.87 0.56 0.71 -45 0.4 Attenuation Rel to IL (dB) 3.5 Control Voltage(Volts) Control Voltage (Volts) 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 Control Voltage(Volts) Frequency (dB) Attenuation vs. Control Voltage Typical Device Deviations F = 2200 MHz @ +25°C 3 Attenuation Delta (dB) 0 -5 Attenuation (dB) Attenuation vs. Temperature, Normalized to +25°C, F=900 MHz -10 -15 -20 -25 -30 -35 -40°C 2 -85°C 1 0 -1 -2 -40 5 -45 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 4 3 2 1 0 Control Voltage (Volts) 0 Control Voltage(Volts) 1 dB Compression vs. Control Voltage @ +25°C, F = 900 MHz 35 IP3 vs. Control Voltage 25 IP3 (dBm) Compression Point (dBm) 30 20 15 10 900 MHz 25 20 400 MHz 15 10 5 5 0 0 -5 5 5 4 3 2 1 0 Control Voltage (Volts) 4 3 2 1 0 Control Voltage (Volts) Specifications subject to change without notice. V 4.0 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.