Audio TLA4891 Line Matching Transformer TLA4891 series transformers are designed to interface telecommunications equipment to a telephone line, capable of handling unbalanced DC. Applications: • Low profile. • Up to 90 mA unbalanced line current. • Exceeds the requirements of FCC Part 68 and CS 03. MECHANICAL 1 4 Pri. Sec. 3 6 TLA4891-1 1 6 Pri 2 5 Sec. 3 4 TLA4891-2 DIMENSIONS, Inches (mm) 1 P/N L W H A B C 2 S (DIA) 5 Pri. TLA4891 1.25 (31.8) 0.81 (20.4) 0.50 0.95 0.20 (12.7) (24.13) (5.08) 0.20 (5.08) Sec. 3 0.027 (0.68) 6 4 TLA4891-3 ISSUE: C 95/04/11 TLA4891 ELECTRICAL TLA4891-2 TLA4891-3 600 Ω 600 Ω 1:1 600 Ω c.t. 600 Ω c.t 1:1 600 Ω 150/150 Ω 1:1 Pri. Sec. 75 100 75 100 75 50 +50 @ 1000 Hz 1.7 dB 1.7 dB 1.7 dB Frequency Response 300 - 3500 Hz - 2.5 dB - 2.5 dB - 2.5 dB Longitudinal Balance 300 - 3500 Hz 65 dB 65 dB 65 dB Return Loss 300 - 3500 Hz > 14.5 dB > 14.5 dB > 14.5 dB 90 mA 90 mA 90 mA 1500 Vrms 1500 Vrms 1500 Vrms Line Impedance Turns Ratio TLA4891-1 Pri. Sec. Pri. : Sec. Winding Resistance, Ohms nom. Insertion Loss DC Capability Dielectric Strength Filtran Limited 229 Colonnade Road, Nepean, Ontario, Canada. K2E 3K7 Tel : (613) 226-1626 Fax : (613) 226-7124 8-8