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100MS
EMI SHIELD
DESCRIPTION
The 100MS is an epoxy encapsulated electromagnetic/
electrostatic interference (EMI) shield for use with
circuits where sensitivity to EMI is critical. It was
designed to attenuate EMI by converting electromag-
netic field energy into heat that is absorbed by the
shield and by shunting electrostatic fields to common.
The 100MS may be used in applications to either
confine or exclude EMI. Its cavity was designed for
28.45mm
x
28.45mm
x
7.24mm, 20-pin hybrid pack-
ages. The shields in the cover and base plate are in two
separate halves to maintain the electrical isolation
between the adjacent rows of pins of the module it
encloses. Because of the spacing between the shield
halves and epoxy flow holes, the 100MS provides a
partial, but adequate low reluctance path for electro-
magnetic flux. The 100MS is well suited for use with
isolation modules such as the Burr-Brown 3656, 722,
and 724.
over the module so the tabs are aligned and fit into the
slots in the base plate. Bend the four wide shield
soldering tabs protruding from the cover to make
contact with the bare metal on the base plate. Solder
these four tabs to insure the integrity of their connec-
tion to the base plate.
The 100MS and the module it contains are mounted
and secured to a printed circuit board (PCB) by solder-
ing the two narrow PCB solder tabs to the appropriate
common. The PCB solder tab closest to the input side
of the module should be soldered to the input com-
mon. The other tab should be soldered to the output
common. Figure 2 illustrates the assembly of the
100MS.
Cover
ASSEMBLY INSTRUCTIONS
Assemble the base plate to the module by pushing the
pins of the module through the beveled holes in the
base plate until the base plate and bottom of the
module are in contact with each other. Place the cover
Epoxy Encapsulant
Shield Solder Tab
PCB Solder Tab
Shield
Solder Tab
Module
(reference only)
Half Cover Shield
Half Cover Shield
Base Plate Shield
V
ISO
Connection to
Input Common
V
ISO
= Isolation Voltage
Connection to
Output Common
Base Plate
FIGURE 1. Cross-Sectional Side View of 100MS.
International Airport Industrial Park 鈥?Mailing Address: PO Box 11400
Tel: (520) 746-1111 鈥?Twx: 910-952-1111 鈥?Cable: BBRCORP 鈥?/div>
FIGURE 2. Assembly Diagram.
鈥?Tucson, AZ 85734 鈥?Street Address: 6730 S. Tucson Blvd. 鈥?Tucson, AZ 85706
Telex: 066-6491 鈥?FAX: (520) 889-1510 鈥?Immediate Product Info: (800) 548-6132
漏 1979 Burr-Brown Corporation
PDS-421A
Printed in U.S.A. October, 1993
SBFS013
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