MODEM MAGNETICS
V.90 ModemTransformers
TM00408
•
•
•
2802A transformer is designed to match a 600Ω line to a
536Ω load
•
Provide isolation and balance while minimizing signal
distortion and insertion loss in high-speed modem
applications
2802B transformer is designed to match a 600Ω line to a
301Ω load
•
•
Qualified per Bellcore TR-TSY-000357-1
Approved by UL and CSA
Minimum interwinding breakdown voltage of 1000 Vrms
ELECTRICAL SPECIFICATIONS at 25° C
Insertion
Loss
dB
Frequency
Response
dB
DCR
Ω
max
Harmonic
Distortion
dB
Longitudinal
Balance
dB
Return Loss
dB
300 Hz - 3500 Hz
> 30
Part
Number
Turns Ratio
± 2%
@ 1 kHz
< 0.80
< 2.8
200 Hz - 5 kHz
< 0.1
Pri
48
Sec
48
0 dBm, 600 Hz 300 Hz - 3500 Hz
2802A
2802B
1 : 1
1 : 1
< -82
< -90
> 60
> 60
> 20
< 0.2
165
170
SCHEMATIC
2802A
2802B
6
4
1
3
Primary
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
T4-17
