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CH1840 Schematic ( PDF Datasheet ) - ETC

Teilenummer CH1840
Beschreibung Low Profile Data Access Arrangement (DAA) Modules
Hersteller ETC
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Gesamt 7 Seiten
CH1840 Datasheet, Funktion
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 Datasheet, Funktion
PARAMETER
LOGIC
Input high
Input low
Input leakage high
Input leakage low
Output high
Output low
Telephone Line Interface AC
Impedance
Isolation Protection
Surge Protection
Transmit Level
Transmit Insertion Loss
Receive insertion Gain
Trans-hybrid loss
On-Hook Impedance
Loop Current
Receive Output Impedance
Transmit Input Impedance
FCC Registration Number
Ringer Equivalence
TIMERS
Ring Detection Delay
Billing Delay Timer
Hook Switch
Power Supply Current
Table 2
CH1840 DAA Electrical Specifications
TA = 0ºC to 55ºC unless otherwise specified
Extended Temperature (ET) versions available to TA = -40ºC to +85ºC
SYMBOL
CONDITIONS
MIN.
TYP.
MAX. UNITS
VIH
VIL
IIH
IIL
VOH
VOL
ZLINE
VTRX
GTRX
GRCV
GTH
ZONHK
ILOOP
ZRNC
ZTRX
REN
TRGD
TBD
ICH5
IOH = 0.2mA
IOL = 2.0mA
Conforms to FCC Part 68 hazardous voltage and
leakage
Conforms to FCC Part 68 for surge
Measure at XMIT, 1800 Hz
CH1840
(Voice Mode) CH1840D
1800 Hz, 600 Ohms, 35mA loop current
CH1840
(Voice Mode) CH1840D
1800 Hz, 600 Ohms, 35mA loop current
600 Ohms +3% between TIP & RING
600 Hz to 4000 Hz
OFFHK = 0 volts
OFFHK = 5 volts
Measured at RCV
Measured at XMIT @ 1800 Hz
Supplied on unit label
Supplied on unit label
Ringing at 40 Hz, 45 VRMS
+5V ±5% Supply Voltage
Off Hook
On Hook
3.0 5.0
-0.3 0.8
500
-500
3.0 3.5 5.3
0 0.2 0.4
V
V
uA
uA
V
V
600 Ohms
1K VRMS
800 Vpeak
0.774
0.251
VRMS
VRMS
9.5 10 10.5
-0.5 0.0
0.5
-0.5 0 +0.5
dB
dB
dB
18 23
dB
10 20
Mohm
20 80 mA
50 mA
50 100
Kohm
0.2A
REN
200 360
2.0 2.5 3.0
0.5 1.0
ms
sec
mA
6 10 mA
3 6 mA
© 2000 Cermetek Microelectronics, Inc.
Page 6
Document No. 607-0011 Rev. A (5/00)

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