20381 BARENTS SEA CIRCLE, LAKE FOREST, CA 92630

Specifications subject to change without notice.

2

pm-wt 08/99

M

P

Premier

Magnetics Inc.

"INNOVATORS IN MAGNETICS TECHNOLOGY"

FDDI & GIGABIT COPPER

MEDIA COUPLING

TRANSFORMERS

!

Optimized for Copper Media Applications of Fast Ethernet & FDDI

"

For use in 150

Ω or 75 Ω systems to ANSI X3T9.5.

$

Frequency Range 2 MHz to 450 MHz.

#

2000Vrms Isolation (Hi-Pot).

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 Typ.

CABLE

MEDIA

TYPE

PM-WT75

75

Ω/150Ω

266+

7.0

1:1

2.5

0.08

0.15

0.50

2.5

410

PM-WT76

75

Ω/150Ω

266+

7.0

1ct:1ct

2.5

0.08

0.15

0.50

2.5

350

PM-WT150 150

Ω STP

266

15.0

1:1

2.5

0.08

0.15

0.80

2.0

410

PM-WT20

75

Ω Coax

133

30.0

1:1

4.0

0.10

0.20

1.50

0.5

250

PM-WT30

150

Ω STP

133

60.0

1:1

5.5

0.10

0.20

2.00

0.5

200

Baud

Rate

(MHz)

PRIMARY*

Inductance

(

µµµµµH Typ.)

TURNS

RATIO

(± 5%)

Rise

Time

(ns Max.)

APPLICATION NOTE:

The PM-WT75 & PM-WT150 versions have been optimized for use with 8B/10B code and NRZ modulation

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 PM-WT75 should be used for both 75

Ω & 150Ω applications using 8B/10B

coding @ > 266MHz Baud Rates.

MECHANICAL

.010

(0.25)

TYP

.370 (9.40)

.020 (0.51) MIN

.019

(0.48)

TYP

.050

(1.27)

TYP

.210

(5.33)

MAX

.280

(7.11)

MAX

.460

(11.68)

MAX

PIN#1

WHITE DOT

.010 (.25)

.004 (.10)

12345678

16 15 14 13 12 11 10 9

M

YYWW

PHYSICAL DIMENSIONS .... IN INCHES (mm)

"G1" PACKAGE

SCHEMATIC

FIGURE 3: 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.025 (.64)

7x.050 (1.27)

16x.075 (1.91)

1

16

8

9

9

12

16

15

7

15

13

10

4

28

3

14

11

6

PRI.

SEC.

PRI.

SEC.

PM-WT76

PM-WT75,150,20,30