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2

EC101.C (7/05)

Application Notes

10BASE-T QUAND SMT

TRANSFORMER MODULES

Pulse’s 10BASE-T Quad SMT Transformer Modules are designed to

interface with transceiver chips offered with internal wave shaping and

filtering. Pulse developed the Modules working closely with IC chip vendors

for this “filter-on-chip” application such as: AMD, Crystal, Level One,

National Semiconductor and Texas Instruments. The Pulse Modules are

available with varying turns ratios optimized for the transceiver chips

available. A cross-reference table listing chip vendor and part number by

Pulse part number is illustrated below.

The Pulse modules offer different levels of electrical performance to meet all

applications.

The Pulse PE-68050L, PE-68065L and E5007 contain transmit and receive

isolation transformers to maintain signal integrity, suppress common mode

noise, and supply equipment isolation per the IEEE 802.3 standard.

The Pulse PE-68049L, PE-68062L and E5002 provide transmit and receive

isolation tansformers as well as the high impedance common mode chokes.

The common mode chokes are incorporated for added EMI suppression

and are often necessary for FCC and CISPR 22 Class B certification.

The Pulse PE-68051 also provides transmit and receive transformers,

transmit chokes and includes a low pass filter on each transmit path. This

added transmit filtering when combined with the internal filtering of the IC

improves the attenuation for designers striving to achieve compliance with

the IEEE 802.3 standard.

In typical multiport applications, many channels are in close proximity. User

compliance with FCC/CISPR 22 Class B requirements can be achieved by

applying rigorous design guidelines to suppress noise mechanisms.

Attention to high frequency signal paths, good PCB grounding techniques,

and component placement are critical. Refer to the suggested layout on

page 8.

All eight modules are encapsulated in a 40-pin surface mountable package.

Mechanical features include:

1. Lightweight - approximately 4 grams for rapid pick-and-place.

2. Compliant leads - provide excellent solder joint reliability.

3. Low profile - under 6 mm to accommodate industry standard pick and

place equipment capabilities.

4. Compact form factor - footprint allows the user to lay out four ports

within the space of two double-stacked RJ-45 connectors or a total of 12

ports to a high density 50-pin connector.

Modules are packaged in tubes unless Tape & Reel is specified. Please add

the suffix “T” such as PE-68049LT for Tape & Reel packaging, in

increments of 250 pieces.

Pulse also offers a full line of 10Base-T filter modules, designed to IEEE

specifications. We provide other pin-out configurations within this package.

For more information, please contact one of the locations listed on the back

page of this data sheet or check the Product Finder on the Pulse Web site

at http://www.pulseeng.com.

Pulse

Crystal

Level One’s

National

Texas

Part Number

Semiconductor’s

LXT901/944

Semiconductor’s

Instrument’s

CS8904

and LXT 914

DP 83953

TNETE2004

PE-68049L

Yes

PE-68050L

Yes

PE-68051

Yes

PE-68062L

Yes

Yes

Yes

PE-68065L

Yes

Yes

Yes

E5002

Yes

E5007

Yes

IC Manufacturers