digital attenuator, 31.5 db, 6-bit, ttl driver dc - 2 ghz at-107 v3.00 m/a-com, inc. north america: tel. (800) 366-2266 n asia/paci?: tel. +81 (03) 3226-1671 n europe: tel. +44 (1344) 869 595 fax (800) 618-8883 fax +81 (03) 3226-1451 fax +44 (1344) 300 020 1 speci?ations subject to change without notice. features attenuation: 0.5-db steps to 31.5 db 2 temperature stability: 0.18 db from -55? to +85? typical low dc power consumption hermetic surface mount package integral ttl driver 50 nominal impedance description m/a-com? at-107 is a gaas fet 6-bit digital attenuator with a 0.5-db minimum step size and 31.5 db total attenuation. this attenuator and integral ttl driver is in a hermetically sealed ceramic 24-lead surface mount package. the at-107 is ideally suited for use where accuracy, fast switching, very low power consumption and low intermodulation products are required. typical applications include dynamic range setting in precision receiver circuits and other gain/leveling control circuits. environmental screening is available. contact the factory for information. parameter test conditions units min. typ. max. reference insertion loss dc - 0.5 ghz db 3.2 dc - 1.0 ghz db 3.6 dc - 2.0 ghz db 4.0 attenuation accuracy 3,4 any single bit dc - 1.0 ghz (0.15 + 3% of attenuation setting in db) db dc - 2.0 ghz (0.2 + 3% of attenuation setting in db) db any combination of bits dc - 1.0 ghz (0.2 + 3% of attenuation setting in db) db or 0.4 db, whichever is greater dc - 2.0 ghz (0.2 + 3% of attenuation setting in db) db or 0.4 db, whichever is greater vswr dc - 2.0 ghz 1.8:1 trise, tfall 10% to 90% ns 9 ton, toff 50% control to 90/10% rf ns 45 transients in-band (peak-peak) mv 40 1 db compression 5 input power 0.05 ghz dbm +21 input power 0.5 - 2.0 ghz dbm +29 input ip 3 5 for two-tone input power 0.05 ghz dbm +35 up to +5 dbm 0.5 - 2.0 ghz dbm +48 input ip 2 5 for two-tone input power 0.05 ghz dbm +75 up to +5 dbm 0.5 - 2.0 ghz dbm +79 v cc v 4.5 5.0 5.5 v ee v -8.0 -5.0 i cc v cc = 4.5 to 5.5 v ma 6.0 vctl = 0 to 0.8 v, or v cc - 2.1 v to v cc i ee v ee = -5.0 to -8.0 v ma 1.0 vctl logic 0 (ttl) v 0.0 0.8 vctll logic 1 (ttl) v 2.0 5.0 input leakage current (low) 0 to 0.8 v a 1.0 input leakage current (high) 2.0 to 5.0 v a 1.0 electrical speci?ations, t a = -55? to +85? orientation mark 0.350 0.050 typ 0.090 max (2.29) 0.008 .002 0.650 (16.51) (1.27) (0.20 0.05) pin 1 pin 1 0.120 (3.05) 0.115 (2.92) 11 equal spaces @ .050 (1.27) tol. non-cumulative (8.89) 0.050 (1.27) 24 places 12 0.015 .003 (0.38 0.08) 24 places 24 pin 24 0.050 (1.27) 22 places pin 12 11 0.620 (15.75) 0.015 (0.38) cr-13 bottom of case is ac ground. dimensions in ( ) are in mm. unless otherwise noted: .xxx 56 0.010 (.xx 56 0.25) l l l l l l 1. all speci?ations apply when operated with bias voltages of +5 v for v cc and -5.0 v to -8.0 v for v ee , and 50 impedance at all ports unless otherwise speci ed. 2. above reference insertion loss. 3. this attenuator is guaranteed monotonic. 4. for the attenuator to meet the guaranteed speci cations, it is necessary to have a dc return on either rf1 or rf2. the dc return can be either a 10 k resistor, or an rf choke. 5. v ee = -5 v for the typical numbers given. bottom view
digital attenuator, 31.5 db, 6-bit, ttl driver at-107 v3.00 m/a-com, inc. north america: tel. (800) 366-2266 n asia/paci?: tel. +81 (03) 3226-1671 n europe: tel. +44 (1344) 869 595 fax (800) 618-8883 fax +81 (03) 3226-1451 fax +44 (1344) 300 020 2 speci?ations subject to change without notice. 0.0 0.5 1.0 1.5 2.0 functional schematic (top view) parameter absolute maximum maximum input power 0.5 ghz 0.5 - 2.0 ghz supply voltages v cc v ee control voltage operating temperature storage temperature absolute maximum ratings typical performance @ +25? note: operation of this device above any one of these parameters may cause permanent damage . insertion loss vs frequency rf1 vswr vs frequency attenuation accuracy vs frequency (8 & 16 db bits, and 31.5 db attenuation) insertion loss (db) +85? +25? -55? 4 db bit reference loss state & 0.5 db bit 8 & 16 db bits 1 db bit deviation from nominal attenuation (db) 0.0 0.5 1.0 1.5 2.0 2.0 1.8 1.6 1.4 1.2 1.0 5.0 4.0 3.0 2.0 1.0 0 vswr frequency (ghz) frequency (ghz) frequency (ghz) 0.0 0.5 1.0 1.5 2.0 rf2 vswr vs frequency 16 db bit reference loss state & 0.5 db bit 8 db bit 4 db bit 1 & 2 db bits 2.0 1.8 1.6 1.4 1.2 1.0 vswr frequency (ghz) rf1 pin 13 pin 24 pin 12 gnd gnd gnd gnd gnd gnd gnd gnd gnd gnd orientation mark rf2 gnd 16 db 8 db 4 db 2 db 1 db 0.5 db pin 1 gnd gnd c16 v ee (-5v to -8v) v cc (+5v) c8 c4 c2 c1 c0.5 gnd control inputs c6 c5 c4 c3 c2 c1 attenuation 0 0 0 0 0 0 reference 0 0 0 0 0 1 0.5 db 0 0 0 0 1 0 1 db 0 0 0 1 0 0 2 db 0 0 1 0 0 0 4 db 0 1 0 0 0 0 8 db 1 0 0 0 0 0 16 db 1 1 1 1 1 1 31.5 db 0 = ttl low 1 = ttl high 6. contact the factory for standard or custom screening requirements. truth table +27 dbm +34 dbm +5.5 v -8.5 v -0.5 v to v cc + 0.5 v -55? to +125? -65? to +150? attenuation accuracy vs frequency (0.5, 1, 2, and 4 db bits) deviation from nominal attenuation (db) 1 db bit 2 db bit 4 db bit 0.5 db bit 0.0 0.5 1.0 1.5 2.0 0.0 0.5 1.0 1.5 2.0 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 0.8 0.4 0 -0.4 -0.8 frequency (ghz) ordering information 6 part number package at-107 pin ceramic 16 db bit 31.5 db atten. 8 db bit
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