Document 201-1 HDSL Transformers This product is not RoHS-compliant. Contact Coilcraft for current status or possible alternatives. These HDSL transformers have been designed to work with a variety of specific transceiver chips to provide 2B1Q coded data transmission. They’re engineered for low leakage inductance and return loss as well as high line isolation. Longitudinal balance and THD are optimized for the best overall performance at a given transmission speed. Coilcraft can also custom engineer a transformer to meet your specific requirements. For free evaluation samples, contact Coilcraft or visit www.coilcraft.com. Specifications Chip set Data rate (kb/s) Turns ratio chip:line HD6788 HD6789 Brooktree BT8952 Brooktree BT8952 784 1168 2CT:1:1 2CT:1:1 3.0 2.0 20 20 4.4 (2-4) 4.4 (2-4) 2.2 (6-7, 8-9) 2.2 (6-7, 8-9) HD6790 HD6791 Brooktree BT8921 Brooktree BT8921 784 1168 1CT:1:1 1CT:1:1 3.0 2.0 20 20 2.2 (2-4) 2.2 (2-4) 2.2 (6-7, 8-9) 2.2 (6-7, 8-9) HD6792 HD6793 Level One SK70704 Level One SK70704 784 1168 1CT:1.8 CT 1CT:1.8 CTS 2.75 2.06 45 40 3.2 (2-4) 2.0 (2-4) 3.0 (6-8, 8-10) 2.0 (6-7, 9-10) Part number DC bias capacity (mA) Dielectric strength min (V) HD6788 HD6789 160 160 1500 1500 18 @ 40 - 200 kHz 16.5 @ 40 - 320 kHz 69 @ 30 kHz 77 @ 30 kHz 63 @ 196 kHz 63 @ 292 kHz -74 @ 100 kHz -74 @ 100 kHz HD6790 HD6791 80 80 1500 1500 18 @ 40 - 200 kHz 16.5 @ 40 - 320 kHz 68 @ 30 kHz 75 @ 30 kHz 56 @ 196 kHz 62 @ 292 kHz -74 @ 100 kHz -74 @ 100 kHz HD6792 HD6793 80 80 1500 1500 18 @ 40 - 200 kHz 16.5 @ 40 - 320 kHz 60 @ 30 kHz 60 @ 30 kHz 48 @ 196 kHz 48 @ 292 kHz -75 @ 5 kHz -74 @ 5 kHz Part number Primary inductance ± 6% (mH) Return loss min (dB) Leakage inductance max (µH) DCR max (Ohms) Chip side Line side Longitudinal balance typ (dB) THD typ (dB) 1. All electrical specifications referenced to line side. 2. Operating temperature range -40°C to +85°C. 3. Electrical specifications at 25°C. Specifications subject to change without notice. Please check our website for latest information. © Coilcraft, Inc. 2007 Document 201-1 Revised 02/11/08 Document 201-2 HDSL Transformers HD6788, HD6789, HD6790, HD6791 HD6792 HD6793 E Recommended Board Layout Packaged 49 per tray A max F H E F typ G typ 0.950 B max C max D min 1.05 0.46 0.12 0.800 0.150 0.017 × 0.038 24,13 26,7 11,7 3,0 20,32 3,81 0,43 × 0,97 H typ 0.025 × 0.045 inches 0,64 x 1,14 cm Specifications subject to change without notice. Please check our website for latest information. © Coilcraft, Inc. 2007 Document 201-2 Revised 02/11/08