56kBit Modem Transformers
General
The advent of high-speed 56kBit modems has necessitated
the design of Line Isolation Transformers that are capable of
providing extremely low distortion across a wide frequency range.
OEP offers the user a number of different variants, with industry
standard pin outs, from which to select a device to satisfy
particular technical and commercial considerations.
Construction
With the exception of the SMD PC Card device, P/N PC3456
these transformers are designed for conventional PCB mounting.
The epoxy resin encapsulation provides reinforced insulation to
meet the requirements of EN60950 / EN41003 and BABT
approvals. Double section bobbins are used except for the
Z1656/4 and PC3456 versions which are concentrically wound on
single section bobbins for closer coupling of the windings thus
providing extremely low leakage inductance figures.
Characteristics
Through Hole Versions
Type No.
Size (mm)
Return
Loss (dB)
200-4kHz
Insertion
Loss (dB)
@1kHz
0.80
0.80
1.50
1.25
Frequency
Response
(dB)
100-4kHz
+/- 0.1dB
100-4kHz
+/- 0.1dB
200-4kHz
+/- 0.1dB
50-5kHz
+/- 0.07dB
Isolation Leakage
Volts
Induct.
400Hz
600Hz
RMS
(mH)
(dB) typical (dB) typical
-100
-88
-83
-84
-93
-91
-93
-93
3750
3750
3750
3750
19
2.8
19.4
14.4
Harmonic Distortion
BABT
Approved
Number
CR/0125
CR/0126
CR/0128
CR/0127
Z1656
Z1656/4
Z1612E
Z1256
>20
18x18x13
encapsulated
>20
18x18x13
encapsulated
18x18x13
>20
encapsulated
19x15x11.2 >26
encapsulated
PC Card (SMD) Version
PC3456
>31
23x16x4.5
including pins
4.00
100-5kHz
+/- 0.05dB
-97
-104
1500
1.3
Pending
OXFORD ELECTRICAL PRODUCTS
15-17 Industrial Estate, Wroslyn Road, Freeland, Witney, Oxfordshire, OX8 8HZ England Tel: +44 (0) 1993 883214 Fax: +44 (0) 1993 882500
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