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参数资料
| 型号： | CH1817ET |
| 厂商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Family of Low Profile DAA Modules |
| 中文描述： | DAA的超薄系列模块 |
| 文件页数： | 1/7页 |
| 文件大小： | 443K |
| 代理商： | CH1817ET |
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.
FUNCTIONAL DESCRIPTION
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.
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.
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.
RI
Output: Active low
Opto coupler, 30K
pull-up
Square wave: 15-68Hz (Typ. 20Hz)
Sensitivity: 38Vrms across Tip & Ring
OFFHK
XMIT
RCV
RI
RING
TIP
GND
V
CC
RING DET.
OFF-HOOK
SWITCH
SURGE
AND
PROTECTION
CIRCUITRY
HYBRID
2W/4W
CONVERTER
ISOLATION
Figure 1. CH1817 DAA Functional Block Diagram.
2002 Cermetek Microelectronics, Inc.
Page 1
Document No. 607-0007 Revision B (01/02)
相关PDF资料 |
PDF描述 |
|---|---|
| CH1817L | Family of Low Profile DAA Modules |
| CH1817LM | Family of Low Profile DAA Modules |
| CH1817-D | Family of Low Profile DAA Modules |
| CH1817LET | Family of Low Profile DAA Modules |
| CH7009A | Chrontel CH7009 DVI / TV Output Device |
相关代理商/技术参数 |
参数描述 |
|---|---|
| CH1817-ET | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Data Access Arrangement (DAA) |
| CH1817L | 制造商:Cermetek Microelectronics 功能描述:Data Access Arrangement (DAA) Modules 9-Pin |
| CH1817-L | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Family of Low Profile DAA Modules |
| CH1817LET | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Family of Low Profile DAA Modules |
| CH1817LM | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Family of Low Profile DAA Modules |
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