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PDF CH1840 Data sheet ( Hoja de datos )
| Número de pieza | CH1840 | |
| Descripción | Low Profile Data Access Arrangement (DAA) Modules | |
| Fabricantes | ETC | |
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Cermetek
microelectronics
CH1840
Low Profile Data Access Arrangement (DAA) Modules
INTRODUCTION
The CH1840 is an ultra small, low profile Data Access Arrange-
ment (DAA). Its modular construction and single +5 Volt D.C. power
requirement simplify your development process. Specifically de-
signed for both voice and data, this device allows direct connec-
tion of these circuits to the telephone lines. The CH1840 has FCC
Part 68 registration that can be transferred to your product. Simply
attach the included registration sticker to the outside of your prod-
uct. This eliminates the costs and delays associated with Part 68
testing and registration.
The CH1840 has also been designed to meet the requirements of
Canada’s Department of Communication (DOC). However, it is
necessary to register your product with the DOC before use in
Canada.
The CH1840 requires only 1.5 square inches of circuit board space
and presents a profile of only 0.35 inches in height. This DAA can
either be mounted directly on a printed circuit board or socketed.
Connection is made through 0.025 inch square pins on 0.10 inch
centers. The telephone line connection is made through a user
supplied RJ-11 jack.
The CH1840 DAA is designed for use with a variety of voice circuitry
and LSI modem/fax chip sets. This device is ideal for fax and
modem applications up through V.32bis. The CH1840 is pin com-
patible with the CH1817.
FEATURES
• Works with all modem chip sets
• Available in 0 dB, -6 dB, and -9 dB insertion losses
• Available in extended temperature operation,
-40oC to +85oC
• Complete DAA function
• Voice and data
• FCC Part 68 registered
• Registration conveyed to user
• Hook switch control
• Ring detection
• Single +5V operation
• Pulse dial capability
FUNCTIONAL DESCRIPTION
The operation of the CH1840 can be broken down into the
functional blocks shown in Figure 1.
1) Phone line control
2) Billing delay
3) Ring detection
4) Signal Path
5) 2- to 4-wire converter
Control inputs and status outputs for the CH1840 are compat-
ible with 5 Volt CMOS. See the Electrical Specifications.
Phone Line Control
In the Public Switched Telephone Network (PSTN), the wires
from a telephone to the phone company’s central office (CO) are
referred to as the local loop.
Figure 1. CH1840 Functional Block Diagram
© 2000 Cermetek Microelectronics, Inc.
Page 1
Document No. 607-0011 Rev. A (5/00)
1 page  
Mounting the CH1840
The CH1840 can be soldered directly to the host circuit card or
installed in sockets. Direct soldering provides the most sound
connection. To avoid the problems of flux contamination, hand
soldering is preferred to wave soldering. Many socket manufac-
turers offer socket strips that accept the 0.025 inch square pins
on 0.10 inch centers. When using mechanical sockets, restraint
of the CH1840 should be provided to keep it seated during ship-
ment. Plastic cablewraps are secure yet easily removed.
FOR YOUR USER’S MANUAL
The Part 68 rules require the following or the equivalent informa-
tion be provided to the end user of equipment containing a DAA:
6. Special FCC rules apply to equipment connected behind a
PBX or KTS.
7. Changes in Attestation Procedure for Plugs and Jacks: (Name
of applicant) attests that the network interface plugs or jacks
used on this equipment comply with and will continue to com-
ply with the mechanical requirements specified in Part 68, Sub-
part F, specifically the dimensions, tolerances and metallic plat-
ing requirements. The compliance of these connectors will be
assured by purchase specifications and incoming inspection.
Documentation of such specifications and/or inspections will
be provided by the FCC within 30 days of their request for the
same.
FCC NOTICE TO THE USERS
1. UPON REQUEST ONLY, you must provide the following data to
your telephone utility company (telco):
a) Notice of intention to install or permanently remove an FCC
Part 68 registered device or system, and the *FCC Registra-
tion Number.
b) *The Ringer Equivalence Number (REN) (see device label).
Note that if several devices are connected to the same line,
the RENs must not add up to more than 5.0 (A or B). This
REN figure is important to your telco.
c) *The (USOC) jack type to be provided by the telco. Typically
this will be RJ-11C/W for single lines.
*The *-flagged items above are noted on the equipment’s
FCC Compliance label.
2. This device may not be used on telco-operated coin phone
lines. Party lines and privately owned coin-phones are
subject to local State regulatory policies, and possible
additional State special requirements.
3. The telco has the right to make changes to its network which
may affect the operation of your equipment, provided you are
given adequate advance written notice to permit correct oper-
ation.
4. In case of operational problems, disconnect your unit by
removing the modular plug from the telco jack. If your regular
phone (or other device or system) still works properly, your
[product name] has a problem and must remain disconnected
and (officially) serviced or returned for repairs. If upon the
above connection, your regular service still has problems,
notify your telco that they may have a problem. Request
prompt service at no cost to you the user. If a problem is
found in premises wiring not telco-installed, you are subject
to a service charge. If a fault is in telco-installed wiring, you
may be subject to a service call charge.
5. Unless otherwise noted in the User’s Manual (e.g.: fuses,
etc.), user may not under any circumstances (in or out of war-
ranty) attempt any service, adjustments or repairs on this
unit. It must be returned to the factory or authorized U.S.
service agency for all such work. Locations (or phone
numbers) of factory or authorized U.S. service points are listed
in this user’s manual.
© 2000 Cermetek Microelectronics, Inc.
Page 5
Document No. 607-0011 Rev. A (5/00)
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet CH1840.PDF ] | |
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