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부품번호 CH1840 기능
기능 Low Profile Data Access Arrangement (DAA) Modules
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CH1840 데이터시트, 핀배열, 회로
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)




CH1840 pdf, 반도체, 판매, 대치품
SAMPLE APPLICATION
Figure 2 illustrates a typical application of the CH1840. When
transmitting data the controller must assert the D/V pin low to
provide the two second billing delay required by the FCC. When
transmitting voice signals, the controller should drive the D/V pin
high. This disables the billing delay, and power squelch.
One of the requirements of an FCC approved DAA is that the
signal transmitted to Tip and Ring does not exceed -9.0 dBm.
The CH1840 incorporates an automatic squelch. If the signal
exceeds -9.5 dBm, the DAA will discontinue transmission until the
signal returns to acceptable levels. The PSQ output indicates
when the squelch circuit has been activated. By utilizing PSQ to
drive the illustrated LED circuit, a visual indication of the squelch
activation can be attained.
DESIGN CONSIDERATIONS
The following guidelines for your product desgin must be fol-
lowed to meet the requirements of FCC Part 68 rules.
1) The mounting of the DAA in the final assembly must be
made so that it is isolated from exposure to any hazard-
ous voltages within the assembly. Adequate separation
and restraint of cables and cords must be provided.
2) The circuitry from the registered unit to the telephone line
must be provided in wiring that carries no other circuitry
than that specifically allowed in the rules ( such as A and
A1 leads).
3) See Section “For Your User’s Manual” for information that
must appear in your User’s Manual.
4) Connection to the phone line should be made through a
standard RJ-11C jack or equivalent.
5) Circuit board traces from the CH1840’s TIP and RING
pins must exceed 0.1 inch spacing to one another and
0.2 inches spacing from all other traces or other conduct-
ing material. Traces should have a nominal width of 0.020
inches or greater.
6) TIP and RING traces should be as short as possible and
should be oriented to prevent direct or induced coupling with other
signals on the host circuit card.
7) No additional application circuitry should be connected be-
tween the CH1840 and the phone line RJ-11C jack, except as
described in note 10 below.
8) The registration label included with the product must be affixed
to the outside of your product where it is easily visible to your end
user.
9) The CH1840 Module is a sensitive subsystem that should be
treated as any other integrated component. Pay special attention
to the power supply to the DAA. The device handles signals in the
millivolt range. Although it is designed to handle noise in the
power supply, steps should be taken to assure the noise level
does not exceed 50 mV peak-to-peak. Failure to provide such
operating conditions could cause the CH1840 to malfunction.
10) The CH1840 DAA meets or exceeds the hazardous voltage,
surge and leakage requirements of the FCC. For applications that
connect to Canadian phone lines, governed by the DOC (Depart-
ment of Communications) and to further protect the CH1840 from
field failure due to poor lines, a higher level of transient protection
is required, thereby making mandatory the circuit consisting of two
fuses and one varistor as shown in Figure 4. Adding these three
devices will not affect FCC or U.L. registration.
Components L1, L2, C1, C2 are optional and serve two
purposes. First, they restrict high frequency signals from
reaching the phone line and thereby add EMI protection.
Second, they protect against externally generated RFI
from degrading the modem’s ability to operate on proper
carrier signals. Adding these devices will not affect
FCC, DOC, or U.L. registration.
Figure 4. Telephone Line Interfaces
© 2000 Cermetek Microelectronics, Inc.
Page 4
Document No. 607-0011 Rev. A (5/00)

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CH1840 전자부품, 판매, 대치품
Figure 5. Pin Connections
Figure 6. Mechanical Specifications
Cermetek
microelectronics
406 TASMAN DRIVE · SUNNYVALE, CALIFORNIA 94089 · TEL: (408) 752-5000 FAX: (408) 752-5004
website: www.cermetek.com
Cermetek reserves the right to make changes in specifications at any time and without notice. The information furnished by
Cermetek in this publication is believed to be accurate and reliable. However, no responsibility is assumed by Cermetek for its use,
or for any infringements of patents or other rights of third parties resulting from its use. No license is granted under any patents or
patent rights of Cermetek.
© 2000 Cermetek Microelectronics, Inc.
Page 7
Printed in U.S.A.
Document No. 607-0011 Rev. A (5/00)

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CH1840

Low Profile Data Access Arrangement (DAA) Modules

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