Cermetek Microelectronics, Inc.
CH1837A/7F/8A Data Access Arrangement Module
2002 Cermetek Microelectronics, Inc.
Page 4
Document No. 607-0014 Revision C2 (12/02)
HANDLING
AND
ASSEMBLY
RECOMMENDATIONS
The CH1837A/7F/8A DAA Module contains static-
sensitive components and should only be handled by
personnel and in areas that are properly protected
against static discharge. Industry standard ESD and
EOS procedures and precautions should be observed
when handling CH1837A/7F/8A products.
MOUNTING THE DAA
There are two mounting techniques recommended for
physically connecting the CH1837A/7F/8A DAA to a
PCB:
1. Direct soldering.
2. Sockets.
Direct Soldering. The CH1837A/7F/8A may be wave
soldered onto a circuit card.
All CH1837A/7F/8A
products are hermetically sealed and will not be
harmed
by
industry
standard
wave
soldering
processes.
To avoid the problems of flux contamination, hand
soldering is preferred to wave soldering.
When
cleaning, use only demonized water.
Socketing.
The socketing approach to mounting
eliminates cleaning and desoldering concerns. When
the socket is used, it must make a solid connection to
all pins.
Failure to do so will cause unreliable or
intermittent operation.
When using sockets, steps should be taken to assure
that the DAA module remains tightly seated in the
socket after the end product is shipped.
It is
recommended that some type of mechanical restraint
be provided to keep the CH1837A/7F/8A seated to
avoid any possibility that the CH1837A/7F/8A works
loose during shipment. See Application Note # 130,
Summary of Recommended Suppliers for a list of
recommended socket manufacturers.
FCC (USA) REGISTRATION
Because the CH1837A/7F/8A already meets the FCC
requirements for Part 68 registration for High Voltage
Isolation and Surge Protection when circuited per the
requirements of Figure 5 herein, certification of the end
product containing the CH1837A/7F/8A DAA is
normally quite simple. The process involves testing
the end system for compliance and submitting the test
data to the FCC for review.
Typically, independent FCC approved testing labs are
contracted to perform the required tests on the end
product and to submit the required paperwork to the
FCC.
If desired, Cermetek can assist with the
Registration activity.
DOT (CANADA) REGISTRATION
The CH1837A/7F/8A DAA meets or exceeds the
hazardous voltage, surge and leakage requirements of
the FCC when circuited per the requirements of Figure
5 herein. Although the FCC and DOT requirements
are virtually identical, it is recommended that for
applications that connect to Canadian PSTN lines, a
Canadian test house/consultant be retained to ensure
compliance of the end product.
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