MODEM MAGNETICS
Global V.90 and V.34 Transformers
TM00403
•
•
Intended for use in high-speed modem applications
Features very low interwinding capacitance, well-
isolated windings, and low total harmonic distortion
•
Designed to comply with EN60950 requirements for a
reinforced insulation barrier with a working voltage
of 250V
Approved by UL, CSA and BABT
Minimum interwinding breakdown voltage of 3000 Vrms
•
•
Qualified per Bellcore TR-TSY-000357-1
•
ELECTRICAL SPECIFICATIONS at 25° C
Insertion
Loss
dB
Frequency
Response
dB
DCR
Ω
max
Longitudinal
Balance
dB
Part
Number
Modem
Speed
Turns
Ratio
± 2%
Return Loss
dB
Harmonic
Distortion
dB
@ 1 kHz
300 Hz - 1 kHz
100 Hz - 4000 Hz
Pri
Sec
> 86,
-9 dBm, 300 Hz
> -80,
-10 dBm, 600 Hz
300 Hz - 3500 Hz
2778A
V.90
1:1
< 1.2
> 18
< 0.5
69
69
> 60
2778B
V.34
1:1
< 1.2
> 20
< 0.5
69
69
> 60
SCHEMATIC
2778A
2778B
1
6
3
Primary
4
Secondary
©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
T4-7