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| Digital Attenuator, 4 Bit, Single Control, 30 dB, 0.5 - 2.0 GHz AT-264 AT-264 Digital Attenuator, 4 Bit, Single Control 30 dB, 0.5 - 2.0 GHz Features * * * * Single Control CMOS logic for each bit Attenuation 2 dB steps to 30 dB Low DC Power Consumtion: 50 uW Low Cost Plastic TSSOP-16 Package TSSOP-16 1 PN 16 25 24 6,0 6,2 .03 03 0,9 0,8 PN 1 .025 0,6 .17 .16 4,0 4,2 Description The M/A-COM AT-264 is a 4 bit, 2 dB step GaAs MMIC digital attenuator in a low cost TSSOP-16 surface mount plastic package. The AT-264 is ideally suited for use where high accuracy, very low power consumption and low intermodulation products are required. Typical applications include radio, cellular, wireless LANs, GPS equipment and other gain/level control circuits. The AT-264 is fabricated using a mature 1 micron GaAs MESFET process. The process features full chip passivation for increased performance and reliability. 20 19 5,1 4,0 1. Dimensions are in inches/mm. Ordering Information Part Number AT-264 AT-264TR Package TSSOP 16-Lead Plastic Tape and Reel 1 1. Refer to Application Note M513 for reel size information. Electrical Specifications: TA = +25C Parameter Reference Insertion Loss Attenuation Accuracy VSWR Trise, Tfall Ton, Toff Transients 1 dB Compression IP2 IP3 1. 2. 1 Test Conditions 0.5 - 1.0 GHz 0.5 - 2.0 GHz 0.5 - 1.0 GHz 0.5 - 2.0 GHz 1.0 - 1.5 GHz 0.5 - 2.0 GHz 10% to 90% RF, 90% to 10% RF 50% Control to 90% RF, 50% Control to 10% RF in Band Input Power Input Power Measured Relative to 2 Input Power Measured Relative to 2 Input Power 0.5 GHz 0.9 GHz 0.5 GHz 0.5 - 2.0 GHz 0.5 GHz 0.5 - 2.0 GHz Units Min. Typ. Max. dB 1.6 1.8 dB 1.8 2.0 (0.15 dB + 5% of Attenuation setting in dB) dB (0.3 dB + 5% of Attenuation setting in dB) dB 1.5:1 1.9:1 3 S 3 S 75 mV dBm 25 dBm 25 dBm 65 dBm 71 dBm 43 dBm 47 All measurements at 900 MHz in a 50 system unless otherwise specified. Loss varies at 0.003 dB/C. For two-tone Input Power up to +5 dBm. V3.00 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, 4 Bit, Single Control, 30 dB, 0.5 - 2.0 GHz AT-264 Absolute Maximum Ratings Parameter Input Power 50 MHz 500 - 2000 MHz Control Voltage Operating Temperature Storage Temperature 1. 1 Functional Schematic Vs 1, 2 Absolute Maximum RF1 GND GND GND GND GND GND RF2 +27 dBm +34 dBm +8.5V, -0.5V -40C to +85C -65C to +150C PIN 16 Exceeding any one or a combination of these limits may cause permanent damage. 16 8 4 2 Truth Table VC1 1 1 1 1 0 0 VC2 1 1 1 0 1 0 VC3 1 1 0 1 1 0 VC4 1 0 1 1 1 0 Attenuation (dB) Reference I.L. 2 4 8 16 30 PIN 1 GND GND VC1 VC2 VC3 VC4 GND GND 1. 2. Blocking Caps are required on all RF ports, 39 pF used for data measurements. Vs = +5+0.2Vdc can be applied at RF1 or RF2 using a 10K or greater pull-up resistor. Logic 0=00.2V Logic 1 = +5v @ 30 A max. current total. Typical Performance Curves Insertion Loss vs. Frequency 2 .5 INSERTION LOSS (dB) 2 VSWR 1 .5 1 0 .5 0 0 .5 1 1 .5 2 2 .5 3 F R E Q U E N C Y (G H z ) 2 .8 2 .6 2 .4 2 .2 2 1 .8 1 .6 1 .4 1 .2 1 0 .5 1 1 .5 2 2 .5 3 F R E Q U E N C Y (G H z ) IL 2 dB ATTEN 16, 30 dB ATTEN VSWR vs. Frequency Attenuation vs. Frequency 0 -2 -4 -6 -8 -1 0 -1 2 -1 4 -1 6 -1 8 -2 0 -2 2 -2 4 -2 6 -2 8 -3 0 -3 2 0 .5 1 1 .5 2 2 .5 3 F R E Q U E N C Y (G H z ) DEVIATION FROM NOMINAL ATTENUATION (dB) Attenuation Accuracy vs. Frequency 1 .5 1 2 dB ATTEN 30 dB ATTEN 16 dB ATTEN ATTENUATION (dB) 0 .5 0 -0 .5 -1 -1 .5 0 .5 1 1 .5 2 2 .5 3 F R E Q U E N C Y (G H z ) 8 dB ATTEN 4 dB V3.00 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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