AS7787-A

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 AS7787-A AS8456-A AS8923-A AS8908-A AS8925-A AS8924-A Part number AS7787-A AS8456-A AS8923-A AS8908-A AS8925-A AS8924-A Style Leaded SMT Leaded SMT Leaded SMT Chip set AD20MSP910/918 CO/CPE AD20MSP910/918 CO/CPE AD20MSP930 CO AD20MSP930 CO AD20MSP930 CPE AD20MSP930 CPE Turns ratio line:chip 1:1 1:1 1.1:1 1.1:1 1.2:1 1.2:1 Line side inductance (mH) 5.0 ± 10% 5.0 ± 10% 2.03 min 2.03 min 2.42 min 2.42 min Leakage inductance max (µH) 16 16 7.5 7.5 7.5 7.5 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 MHz) MHz) MHz) MHz) MHz) MHz) 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) THD @ 20 kHz typ (dB) -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 Dielectric strength (V) 1875 1875 2300 2300 2300 2300 Capacitance max (pF) 55 55 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. Document 244-1 Revised 09/25/08 © Coilcraft, Inc. 2008 Coilcraft, Document 244-2 ADSL Transformers for Analog Devices Leaded Transformers B 10 1 Surface Mount Transformers Dot above pin1 C A 6 5 C D B E 6 5 E 6 5 F F G 10 1 F H A G 10 1 Recommended Board Layout Recommended Land Pattern A max B max C max 0.550 13,97 0.550 13,97 0.500 12,70 D min E 0.100 2,54 F typ G dia 0.013 0,33 H dia 0.032 0,82 A max 0.530 13,46 B max 0.699 17,75 C max 0.500 12,70 E 0.590 14,99 F typ 0.098 2,50 G typ 0.050 × 0.061 1,27 × 1,55 0.400 0.100 10,16 2,54 Schematics AS7787-A, AS8456-A Line side 1 Chip side 10 10 AS8923-A, AS8908-A AS8925-A, AS8924-A Line side Chip side 1 3 2 8 9 8 9 3 2 4 7 7 4 Specifications subject to change without notice. Please check our website for latest information. Document 244-2 Revised 09/25/08 © Coilcraft, Inc. 2008 Coilcraft,