S553-6500-F4 Просмотр технического описания (PDF) - Bel Fuse Inc.

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S553-6500-F4

HIGH FREQUENCY MAGNETICS T1/E1 Dual Hybrid Transformer Module

Bel Fuse Inc. 

HIGH FREQUENCY MAGNETICS

T1/E1 Dual Hybrid Transformer Module

TM01125

APPLICATION NOTES

The S553-6500-F4 hybrid transformer module contains two identical balanced hybrid transformers. Each balanced

hybrid is arranged in a symmetrical 4-port configuration, which provides low loss for preferred paths and high loss in

non-preferred (transhybrid) paths:

Bi-directional

Preferred Paths

Bi-directional

Non-preferred Paths

Port A to Port B

Port A to Port C

Port A to Port D

Port B to Port C

Port D to Port B

Port D to Port C

Normally, each hybrid is used as a 3-port device and the fourth port is terminated in a resistor whose value is equal

to the line impedance (100 Ω for T1, 75 Ω or 120 Ω for E1). While each hybrid is designed to handle balanced lines,

it will also handle a 75 Ω unbalanced line as well. In this case, R1 should be set to 75 Ω and should be left floating

as it is for the balanced lines also.

In operation, a signal at Port A is divided equally at Ports B and C with half of its original power appearing at Port B

and half at Port C. Signal isolation between splitting Ports B and C is very high at the fundamental T1 and E1 pulse

repetition frequencies. In fact, the signal isolation is typically greater than 55 dB from 500 kHz to 5 MHz. This allows

equipment connected at one of the splitting ports to be shorted or opened with virtually no effect on the signal at

the other port. In the preferred paths, the insertion loss is very low – typically less than 0.2 dB. This value is added

to the theoretical half-power or 3 dB value that results from the equal signal split to obtain a total insertion loss of

3.2 dB from input to either output.

A typical signal-splitting application is shown below. A single input signal is applied at the ASIG inputs of Port A and

is split equally at the BSIG and CSIG outputs of Ports B and C.

TYPICAL APPLICATION

Half of S553-6500-F4

100 Ω

Line Port A

Input

R1 Port D

100 Ω

1 ASIG+

2 ASIG-

3

4

5 DSIG+

6 DSIG-

7

8

BSIG+ 32

BSIG- 31

COM 1 30

COM 2 29

CSIG+ 28

CSIG- 27

COM 3 26

COM 4 25

Port B

Port C

LIU 1

LIU 2

©2001 Bel Fuse Inc. Specifications subject to change without notice. 12.01

Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com

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