MODEM MAGNETICS V.90 Modem Transformer • • TM00405 Provides isolation and balance while minimizing signal distortion and insertion loss in high-speed modem applications • Approved by UL and CSA • Minimum interwinding breakdown voltage of 1000 Vrms Designed to match a 600Ω line to a 374Ω load with no direct current in the windings • Qualified per Bellcore TR-TSY-000357-1 ELECTRICAL SPECIFICATIONS at 25° C Part Number Turns Ratio ± 2% 2791C 1:1 Insertion Loss dB Return Loss dB Frequency Response dB DCR Ω max @ 1 kHz 300 Hz - 3500 Hz 200 Hz - 4 kHz Pri < 2.0 > 25 < 0.1 118 Harmonic Distortion dB Longitudinal Balance dB Sec -10 dBm, 600 Hz 300 Hz - 3500 Hz 125 < -84 > 60 SCHEMATIC 2791C 1 6 3 4 Primary Secondary TYPICAL SPICE TRANMISSION MODEL 107 2.8 mH 114 1 6 20 pF 3 60 k 18 H 20 pF 4 ©2000 Bel Fuse Inc. Specifications subject to change without notice. 05.00 Bel Fuse Inc. 198 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com T4-11 MODEM MAGNETICS V.90 Modem Transformer TM00405 MECHANICAL 2791C 0.48 [12.19] max 0.023 [0.58] Square, Phosphor Bronze, Solder-Coated 0.110 [2.79] 0.69 [17.53] max 0.450 [11.43] Terminal 1 Identifier 0.71 [18.03] max 0.225 [5.72] 1 3 6 4 0.550 [13.97] 0.275 [5.99] Note: Unless otherwise specified, dimensions are nominal and in inches [millimeters]. ©2000 Bel Fuse Inc. Specifications subject to change without notice. 05.00 CORPORATE FAR EAST EUROPE Bel Fuse Inc. 198 Van Vorst Street Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com Bel Fuse Ltd. 8F / 8 Luk Hop Street San Po Kong Kowloon, Hong Kong Tel 852-2328-5515 Fax 852-2352-3706 www.belfuse.com Bel Fuse Europe Ltd. Preston Technology Management Centre Marsh Lane, Suite G7, Preston Lancashire, PR1 8UD, U.K. Tel 44-1772-556601 Fax 44-1772-888366 www.belfuse.com T4-12