ISDN U-Interface Transformer P/N T-1269 1:1.5 : + 1% 1.58 : 1 1:1 Turns Ratio (PRI : SEC) (1-2 : 3-4) (5-6 : 7-8) Schematic Diagram Parameter Min. Typ. Max. Units Inductance 5-8 (6-7, shorted) 21.6 27 32.4 mH Return Loss At 40 kHz 28 1.80 1.45 4.00 4.00 Hi-Pot 500 Primary to Secondary PRI 5 2 6 3 7 4 8 24Ω SEC dB Total Harmonic Distortion 1 DC Resistance 1 - 2 DC Resistance 3 - 4 DC Resistance 5 - 6 DC Resistance 7 - 8 30Ω 1 70 dB 2.20 1.80 5.00 5.00 Ω Ω Ω Ω 24Ω VRMS 1. With 90 mADC through SEC and 40 kHz sine wave injected into the PRI at a level which generates 5V p-p into 135 ohms at the SEC. Designed to meet the requirements for national ISDN U-INTERFACE chip TP3410 .800 (20.32) .840 (21.34) Pin Position Grid 0.100 (2.54) Holes For Bobbin Pins Holes For Clip Pins .640 (16.26) .197 (5.00) NOM. Pin Diameter is 0.026 (0.66) 8 7 6 5 2 Physical Dimensions inches (mm) Bottom View 1 .039 (0.99) TYP. 3 4 9/8/99 Rhombus Industries Inc. Transformers & Magnetic Products 15801 Chemical Lane, Huntington Beach, CA 92649 Phone: (714) 898-0960 www.rhombus-ind.com FAX: (714) 896-0971