xdsl interface transformers document 231 document 231 revised 01/16/08 these transformers provide coupling and line isolation for xdsl interfaces using the linear technology lt1794, lt1795 and lt1886 amplifers. they feature very low leakage inductance, stable primary inductance from -40c to +85c and longitudinal balance optimized for the best overall performance at adsl and hdsl2 transmission speeds. in addition to the standard models shown, coilcraft can provide custom transformers with other turn ratios. for free evaluation samples or to discuss custom designs, contact coilcraft or visit www.coilcraft.com . 1. turns ratio is with the chip side windings connected in series. 2. all electrical specifcations referenced to line side. 3. operating temperature range -40c to +85c. 4. electrical specifcations at 25c. line side leakage part inductance inductance dcr max (ohms) number style chip set (mh) (h) max chip side line side x8390-a smt lt1794, lt1886 0.368 5% 11 0.841 (6-9, 7-10) 1.95 (4-2) x8502-a smt lt1794, lt1886 0.368 5% 11 0.895 (6-9, 7-10) 1.70 (4-2) x8505-a smt lt1886 0.368 5% 11 0.750 (6-9, 7-10) 1.85 (4-2) x8504-a smt lt1795 0.368 5% 11 0.875 (6-9, 7-10) 1.75 (4-2) dielectric longitudinal part strength turns ratio 1 balance designed number (v) line : chip (db) min to meet x8390-a 1500 1 : 1 45 (20 khz - 1.1 mhz) ul 1459, 1950 x8502-a 1500 1 : 1.2 42 (20 khz - 1.1 mhz) ul 1459, 1950 x8505-a 1500 1 : 1.5 42 (20 khz - 1.1 mhz) ul 1459, 1950 x8504-a 1500 1 : 1.4 42 (20 khz - 1.1 mhz) ul 1459, 1950 for lt1794, lt1795 and lt1886 a dot abo ve pin1 c b 5 1 recommended land p attern e f g 1 6 10 tape and reel 175 per 13 reel plastic tape: 32 mm wide, 0.5 mm thick, 28 mm pocket spacing, 12.93 mm pocket depth a max b max c max e f typ g typ 0.530 0.699 0.500 0.590 0.098 0.061 0.050 13,46 17,75 12,70 14,99 2,50 1,55 1,27 9 10 2 6 7 4 line side chip side this product is not rohs-compliant. contact coilcraft for current status or possible alternatives. chip side windings to be connected in series on the pc board us uk t aiwan china singapore +1-847-639-6400 sales@coilcraft.com +44-1236-730595 sales@coilcraft-eur ope.com +886-2-2264 3646 sales@coilcraft.com.tw +86-21-6218 8074 sales@coilcraft.com.cn + 65-6484 8412 sales@coilcraft.com.sg ? coilcraft inc. 2012 this pr oduct may not be used in medical or high risk applications without prior coilcraft appr oval. specification subject to change without notice. please check out web site for latest infor mation.
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