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| Digital Attenuator, 1 Bit, Variable Step, 10 - 20 dB, DC - 3000 MHz AT-246 AT-246 Digital Attenuator, 1 Bit, Variable Step 10 - 20 dB, DC - 3000 MHz Features * * * * * * Variable Step (10 - 20 dB) with an External Resistor Matched Input and Output Low Intermodulation Product: +53 dBm IP3 Low DC Power Consumption: 50 W Low Cost, Low Profile MSOP 8 Plastic Package Tape and Reel Packaging Available MSOP-8 1 R .0 1 0 ID P IN 0 .0 0 7 0 .1 1 8 4X 12 0 .1 9 3 Description M/A-COM's AT-246 is a GaAs MMIC matched 1 bit attenuator in a low cost plastic MSOP-8 package. It is designed to be a building block for a single step attenuator by placing a resistor across RF1-RF2. Attenuation levels of 10 to 20 dB with flat response are achievable from DC to 3 GHz. The AT-246 is ideally suited for circuits where fast switching, very low power consumption and low intermodulation products are required. Typical applications include gain/level and sensitivity control in radio and cellular equipment, wireless LAN's, GPS equipment and other gain/level control circuits. The AT-246 is fabricated using a mature 1-micron gate length GaAs MESFET process. The process features full chip passivation for increased performance and reliability. .0 2 0 .0 2 0 0 .1 1 8 4X 12 0 .0 2 5 6 0 .0 2 1 5 3 0 .0 3 4 0 .0 1 3 0 .0 0 8 0 .0 4 0 1. Dimensions are in inches. Ordering Information Part Number AT-246 PIN AT-246TR Package MSOP-8 Lead Plastic Forward Tape and Reel 1 1. If specific reel size is required, consult factory for part number assignment. Electrical Specifications: TA = +25C Parameter Reference Insertion Loss Attenuation Flatness VSWR 1 dB Compression Trise, Tfall Ton, Toff Transients IP2 IP3 1. 2. 1, 2 Test Conditions DC - 3.0 GHz DC - 1.5 GHz 1.5 - 3.0 GHz DC - 3.0 GHz Input Power 50 MHz Input Power 500 MHz 10% to 90% RF, 90% to 10% RF 50% Control to 90% RF, Control to 10% RF In-band Measured Relative 50 MHz 500 MHz to Input Power2 Measured Relative 50 MHz 2 500 MHz to Input Power Units dB dB dB dBm dBm S S mV dBm dBm dBm dBm Min. Typ. 0.8 0.5 1.5 1.3:1 24 30 20 23 25 54 73 45 55 Max. 1.0 1.0 2.0 All measurements in a 50 system unless otherwise specified. Loss varies at 0.003 dB/C. For two-tone Input Power up to +5 dBm. V2.00 M/A-COM Division of AMP Incorporated 3 North America: Tel. (800) 366-2266, Fax (800) 618-8883 3 Asia/Pacific: Tel.+85 2 2111 8088, Fax +85 2 2111 8087 3 Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020 www.macom.com AMP and Connecting at a Higher Level are trademarks. Specifications subject to change without notice. Digital Attenuator, 1 Bit, Variable Step, 10 - 20 dB, DC - 3000 MHz AT-246 Absolute Maximum Ratings Parameter Input Power 50 MHz 500 - 2000 MHz Control Voltage Operating Temperature Storage Temperature 1. 1 Functional Schematic RF1 Rstep GND GND RF2 Absolute Maximum +27 dBm +33 dBm +5V, -8.5V -40C to +85C -65C to +150C 20dB Exceeding any one or a combination of these limits may cause permanent damage. PIN 1 GND V1 V2 GND PIN Configuration PIN No. 1 2 3 4 5 6 7 8 Function GND V1 V2 GND RF2 GND GND RF1 Description RF Ground Bit Control Bit Control RF Ground RF in/out RF Ground RF Ground RF in/out Note: Rstep value is selected for desired attenuation level. The usable range is 50 to OPEN to achieve 10 - 20 dB attenuation with >15 dB Return Loss. Truth Table V1 0 1 "0" = 0 0.2V "1" = -5 0.2V V2 1 0 Attenuation (dB) Reference I.L. Step Typical Performance Curves 1.2 Insertion Loss (dB) 1 0.8 0.6 0.4 0.2 0 0 0.5 1 1.5 2 FREQUENCY (GHz) 2.5 3 Insertion Loss vs. Frequency Attenuation (dB) +85 C +25 C -40 C 25 20 15 10 5 0 ATTENUATION vs FREQUENCY Attenuation vs. Frequency RStep=OPEN RStep= 820 RStep=180 RStep=51 0 1 2 FREQUENCY (GHz) 3 4 1.5 1.4 VSWR vs Frequency Recommended Layout PIN 1 Step Set Resistor VSWR 1.3 1.2 1.1 1 0 1 2 FREQUENCY (GHz) 3 4 Worst Case V2.00 M/A-COM Division of AMP Incorporated 3 North America: Tel. (800) 366-2266, Fax (800) 618-8883 3 Asia/Pacific: Tel.+85 2 2111 8088, Fax +85 2 2111 8087 3 Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020 www.macom.com AMP and Connecting at a Higher Level are trademarks. Specifications subject to change without notice. |
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