20381 BARENTS SEA CIRCLE, LAKE FOREST, CA 92630

Specifications subject to change without notice.

3

pm-wt 08/99

M

P

Premier

Magnetics Inc.

"INNOVATORS IN MAGNETICS TECHNOLOGY"

12

3

456

7

8

16

15

14

13

12

11

10

9

.390

(9.91)

MAX

.020 (.51)

.010 (.25)

.100

(2.54)

TYP

.020

(0.51)

TYP

.050

(1.27)

TYP

.950

(24.13)

MAX

PIN#1

DOT

FLAT

.050 (1.27)

.030 (0.76)

.580

(14.73)

.010

(0.25)

TYP

3KV REINFORCED

INSULATION

COUPLING TRANSFORMER

!

"

For use in 150

Ω STP or 75 Ω Coax, Copper Media Applications of Fast Ethernet, FDDI & ATM

$

IEC950, UL1950, CSA-950, 3000Vrms Reinforced Insulation System. >6.2mm Creepage/Clearance

PART

NUMBER

PRI-SEC

Cw/w

(pf Max.)

PRI / SEC

L

L

(

µµµµµH Max.)

PRI/SEC

DCR

(

Ω

Ω

Ω

Ω

Ω Max.)

-3dB Bandwidth

MHz

Low Max.

High Min.

CABLE

MEDIA

TYPE

TSD-1227*

50/75

Ω

266+

7.0

1:1

1.5

0.13

0.15

0.50

2.0

380

Baud

Rate

(MHz)

PRIMARY*

Inductance

(

µµµµµH Typ.)

TURNS

RATIO

(± 5%)

Rise

Time

(ns Max.)

*APPLICATION NOTE:

Reinforced Insulation System per IEC950, UL1950, CSA-950.

The TSD-1227, 3KV reinforced insulation version of the PM-WT75 was optimized for use with 8B/10B code

is the elimination of baseline wander concerns (DC bias). Methods of encoding that are not DC balanced,

such as FDDI 4B/5B require a compromise in the magnetics design as more turns (higher inductances) are

necessary to combat the DC imbalance. Thus the major design consideration for 8B/10B code was to provide

sufficient high end bandwidth to allow passage of at least the 3rd hamonic. In a system operating at a 266

MHz baud rate this 3rd harmonic is at 399MHz. The TSD-1227 should be used for both 75

Ω & 150Ω

applications using 8B/10B coding @ > 266MHz Baud Rates.

MECHANICAL

M

YYWW

PHYSICAL DIMENSIONS .... IN INCHES (mm)

SCHEMATIC

RECOMMENDED PCB LAYOUT

DIMENSION IN INCHES, (mm)

9

12

16

15

7

15

13

10

4

28

3

14

11

6

PRIMARY

SECONDARY

PRIMARY

SECONDARY

16x.050 (1.27)

7x.100 (2.54)

16x.120 (3.05)

.520 (13.21)

1

16

9

8

.760 (19.30)

.700 (17.78)