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