Document 255 ADSL Interface Transformers For Virata Beryllium chipset These transformers provide coupling and line isolation for ADSL interfaces using the Virata Beryllium chip set. They feature very low leakage inductance, stable primary inductance from -40°C to +85°C and longitudinal balance optimized for the best overall performance at ADSL transmission speeds. In addition to the standard model shown, Coilcraft can provide custom transformers with other turns ratios. For free evaluation samples or to discuss custom designs, contact Coilcraft or visit www.coilcraft.com. Part number Style X8388-C SMT Chip set Line side inductance (mH) Leakage inductance max (µH) Virata Beryllium 600 ±5% 6 Part number Dielectric strength (V) Turns ratio line : chip Longitudinal balance min (dB) Designed to meet X8388-C 2300 1 : 1.21 45 (20 kHz – 600 kHz) UL 1950 DCR max (Ohms) Chip side Line side 1.27 (7-6), 1.19 (9-8) 1.16 (2-3, 4-5) 1. All electrical specifications referenced to line side. 2. Operating temperature range -40°C to +85°C. 3. Electrical specifications at 25°C. Dot above pin1 6 Line side E 5 Chip side 2 9 3 4 8 5 6 F C A 10 7 1 B Recommended Land Pattern 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 G Tape and reel: 175/13″ reel 32 mm tape width For packaging data see Tape and Reel Specifications section. Specifications subject to change without notice. Document 255 Revised 11/02/04