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CH1817 Schematic ( PDF Datasheet ) - ETC

Teilenummer CH1817
Beschreibung Family of Low Profile DAA Modules
Hersteller ETC
Logo ETC Logo 




Gesamt 7 Seiten
CH1817 Datasheet, Funktion
www.DataSheet4U.com
CH1817
Family of Low Profile DAA Modules
INTRODUCTION
The CH1817 is a Family of Low Profile Data Access
Arrangement (DAA) Modules. They are compatible
with all modem chip sets. These devices have been
tested to meet or exceed FCC Part 68 requirements
and are Canadian DOC approvable. They are also
recognized by Underwriters Laboratories to UL 1459
Specifications.
The CH1817 modules are ultra small (1.0” x 1.0”
x0.35”) affording an easy integration into space-
sensitive designs, including laptop and hand-held
computer based products. The CH1817 family of
products may be socketed or mounted directly onto a
Printed Circuit Board (PCB). The telephone line
connection is made through TIP and RING to an RJ-11
jack or equivalent.
The CH1817 is intended for use with FAX/modem chip
sets that have a data throughput of up through
V.32bis. For High Speed Applications, Cermetek
recommends the CH1837A.
FEATURES
Low Profile, Ultra small size: 1.0” x 1.0” x 0.35”
Complete DAA function
Ring detection
Built-in 2-wire to 4-wire conversion
Lightweight
Multimedia compatible
+5V operation
1000 VAC isolation
800 Volt surge protection
V.32bis/14,400bps, applications
UL1459 recognized
CH1817-L: Low power consumption and Common
mode noise rejection filter
CH1817-LM (special order): Reduced transmit
attenuation
CH1817-D: Differential transmission input and 0dB
transmission insertion loss.
DataShee
FUNCTIONAL DESCRIPTION
DataSheet4U.com
Ring Detection. Referring to the block diagram in
Figure 1, incoming ring detection is performed by the
CH1817 and the RI pin is set Low during the 2 second
(typical) ring period and is restored to High for the 4
seconds (typical) between rings. During incoming ring
signal activity, the RI output is pulsed at the same
frequency as the ringing signal, typically 20Hz. Figure
2 contains additional external circuitry which may be
used to provide an envelope indication of the ring
signal. The internal ring detection circuit is designed
to deter false indications due to pulse dialing or noise
on the line.
VCC
ISOLATION
GND
SURGE
AND
PROTECTION
CIRCUITRY
TIP
RING
The RI output of the CH1817 is diode protected.
Therefore, an external pull-up resistor (R>100Kohm)
to +5V may be utilized to activate the ring detection
circuit when the CH1817 is not connected to power.
This can be handy in designs where power
consumption is of concern. When circuited in this
manner, there is virtually no current draw until a ring
signal is present.
XMIT
RCV
RI
HYBRID
2W/4W
CONVERTER
OFFHK
OFF-HOOK
SWITCH
RING DET.
RI
Output: Active low
Opto coupler, 30Kpull-up
Square wave: 15-68Hz (Typ. 20Hz)
Sensitivity: 38Vrms across Tip & Ring
DataSheet4U.com
Figure 1. CH1817 DAA Functional Block Diagram.
2002 Cermetek Microelectronics, Inc.
DataSheet4 U .com
Page 1
Document No. 607-0007 Revision B (01/02)






CH1817 Datasheet, Funktion
www.DataSheet4U.com
Cermetek Microelectronics, Inc.
CH1817 Family of Low Profile DAA Modules
et4U.com
Parameter
Table 2. CH1817 DAA Electrical Specifications.
VCC=+5VDC ± 5%, TA=0° to 55°C
Conditions
Min.
Supply Current
Off-Hook
Transmission
Insertion Loss
Receive Gain
Telephone Line
Input Impedance
Trans-Hybrid Loss
Transmit Input
Impedance
Receive Output
Impedance
Ring Detect
Sensitivity
Ringer Equivalency
Number (REN)
Hook Switch Control
Current
Loop current
Off-Hook
Attenuation between transmit input and telephone line at
1800Hz with 600Ohm termination:
CH1817-L measured XMIT(+) with respect to GND
CH1817-DM measured XMIT(-) with respect to XMIT(+)
CH1817-LM measured XMIT(+) with respect to GND
CH1817-D measured XMIT(-) with respect to XMIT(+)
Gain between telephone line and receive output at
1800Hz with 600Ohm termination
At 1800Hz
Attenuation between the transmitter input and receiver
output at 1800Hz with 600Ohm termination
At 1800Hz
At 1800Hz
AC voltage between TipDaantadSRhienegt4U.com
Type “A”
9.0
6.0
6.0
-0.5
-0.5
550
18
120
38
20
Weight
Typ.
4
0.6
9.5
6.5
6.5
0.0
0.0
600
23
150
100
0.2
4
10
Max. Units
6 mA
1.5 mA
10.0 dBm
7.0 dBm
7.0 dBm
0.5 dBm
0.5 dBm
650 Ohm
dBm
200 kOhm
1000
Ohm
DataShee
Vrms
A
mA
80 mA
gm
Figure 6. Pin Connections.
DataSheet4U.com
2002 Cermetek Microelectronics, Inc.
DataSheet4 U .com
Page 6
Document No. 607-0007 Revision B (01/02)

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