Document 244-1 ADSL Transformers For Analog Devices chipsets This product is not RoHS-compliant. Contact Coilcraft for current status or possible alternatives. These transformers have been designed to provide optimum performance with various ADSL chip sets from Analog Devices. They feature a compact size, minimum DC resistance and very low leakage inductance. Primary inductance is stable from -40°C to +85°C and the longitudinal balance is optimized for the best overall performance at the ADSL transmission speed. Most parts have been designed to meet UL 1950 requirements. For free evaluation samples or to discuss custom designs, please contact Coilcraft. SPECIFICATIONS Part number Style AS7787-A AS8456-A AS8923-A AS8908-A AS8925-A AS8924-A Leaded SMT Leaded SMT Leaded SMT Chip set Line side inductance (mH) Leakage inductance max (µH) AD20MSP910/918 CO/CPE AD20MSP910/918 CO/CPE AD20MSP930 CO AD20MSP930 CO AD20MSP930 CPE AD20MSP930 CPE 5.0 ± 10% 5.0 ± 10% 2.03 min 2.03 min 2.42 min 2.42 min 16 16 7.5 7.5 7.5 7.5 Part number Dielectric strength (V) Turns ratio line:chip Capacitance max (pF) AS7787-A AS8456-A AS8923-A AS8908-A AS8925-A AS8924-A 1875 1875 2300 2300 2300 2300 1:1 1:1 1.1:1 1.1:1 1.2:1 1.2:1 55 55 DCR max (Ohms) Chip side Line side 1.21 (10-8), 1.65 (9-7) 1.21 (10-8), 1.65 (9-7) 0.60 (1-3, 2-4) 0.60 (1-3, 2-4) 0.55 (1-3, 2-4) 0.55 (1-3, 2-4) Longitudinal balance min (dB) 40 40 40 40 40 40 (20 (20 (20 (20 (20 (20 kHz – 1.1 kHz – 1.1 kHz – 1.1 kHz – 1.1 kHz – 1.1 kHz – 1.1 THD @ 20 kHz typ (dB) MHz) MHz) MHz) MHz) MHz) MHz) -89 -89 -85 -85 -85 -85 1.42 (1-3, 2-4) 1.42 (1-3, 2-4) 0.60 (10-8), 0.60 (9-7) 0.60 (10-8), 0.60 (9-7) 0.58 (10-8), 0.58 (9-7) 0.58 (10-8), 0.58 (9-7) Designed to meet UL UL UL UL UL UL 1459, 1459, 1459, 1459, 1459, 1459, 1950 1950 1950 1950 1950 1950 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. 2008 Document 244-1 Revised 09/25/08 Document 244-2 ADSL Transformers for Analog Devices Leaded Transformers Surface Mount Transformers B Dot above pin1 10 1 C C A 6 5 B D E E 6 6 5 10 1 F 5 F A F H G 10 1 Recommended Board Layout A max B max C max D min E F typ G dia G Recommended Land Pattern H dia A max B max C max E F typ G typ 0.550 0.550 0.500 0.100 0.400 0.100 0.013 0.032 0.530 0.699 0.500 0.590 0.098 0.050 × 0.061 13,97 13,97 12,70 2,54 10,16 2,54 0,33 0,82 13,46 17,75 12,70 14,99 2,50 1,27 × 1,55 Schematics AS7787-A, AS8456-A Line side AS8923-A, AS8908-A AS8925-A, AS8924-A Chip side Line side Chip side 1 10 10 1 3 8 8 3 2 9 9 2 4 7 7 4 Specifications subject to change without notice. Please check our website for latest information. © Coilcraft, Inc. 2008 Document 244-2 Revised 09/25/08