CH224ATF(1999) Просмотр технического описания (PDF) - Cermetek Microelectronics
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CH224ATF Datasheet PDF : 14 Pages
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PRELIMINARY
PHONE LINE CONNECTION GUIDELINES
1) The CH224ATF must be mounted in the final
assembly such that it is isolated from exposure to
any hazardous voltages within the assembly.
Adequate separation and restraint of cables and
cords must be provided.
2) The circuitry from the CH224ATF to the
telephone line interface must be provided in wiring
that carries no other circuitry other than that
specifically allowed in the FCC rules (such as A
and A1 leads).
3) Connection to phone line should be made
through an RJ-11C jack.
4) PCB traces from the modem’s RING and TIP
pins to the RJ-11C jack must be 0.1 inch spacing
or greater to one another and 0.2 inch spacing or
greater to all other traces. The traces should have a
nominal width of 0.020 inches or greater.
5) The RING and TIP PCB traces should be as
short as possible and oriented to prevent coupling
other high speed or high frequency signals present
on the host circuit PCB.
6) No additional circuitry other than that shown in
Figure 7A or 7B may be connected between the
modem module and the RJ-11C jack. Doing so will
invalidate the FCC approval.
7) The CH224ATF requires external surge
protection (see Figure 7).This is mandatory to
maintain FCC Part 68 conveyed approval.
8) The CH224ATF, the RJ-11C jack, the
interfacing circuitry and all PCB traces in between,
must be contained on a PCB with a 94 V-0
flammability rating.
9) The supplied FCC registration label must be
applied visibly on the outside of the product.
10) The product ’s User Manual must provide the
user
with instructions for connection and use as
recommended in the FCC Registration Section
below.
INTERNATIONAL APPROVALS
The CH224ATF can be approved for some
international telephone connections. This must be
done after the modem is installed in the host
product.
CH224ATF
The entire host product must be submitted to
the country of interest’s Telephone Network
approval authority. They are available on
special order. The end product supplier is
responsible for submission of the end product
for independent testing and subsequent
approval. See Application Cermetek Note
#142 for typical telephone requirements.
CH224ATF HANDLING AND
ASSEMBLY RECOMMENDATIONS
The CH224ATF contains static-sensitive
compo-nents and should only be handled by
personnel and in areas that are properly
protected against static discharge.
©1999 Cermetek Microelectronics, Inc.
12
Document No. 607-0005 Rev.A (11/99)
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