ch1817lm ETC-unknow, ch1817lm Datasheet

ch1817lm

Manufacturer Part Number

ch1817lm

Description

Family Of Low Profile Daa Modules

Manufacturer

ETC-unknow

Datasheet

1.CH1817LM.pdf (7 pages)

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¤2002 Cermetek Microelectronics, Inc.

INTRODUCTION

The CH1817 is a Family of Low Profile Data Access

Arrangement (DAA) Modules.

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.

products may be socketed or mounted directly onto a

Printed Circuit Board (PCB).

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.

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.

manner, there is virtually no current draw until a ring

signal is present.

Output: Active low

Opto coupler, 30K: pull-up

Square wave: 15-68Hz (Typ. 20Hz)

Sensitivity: 38Vrms across Tip & Ring

For High Speed Applications, Cermetek

The CH1817 family of

When circuited in this

Family of Low Profile DAA Modules

They are compatible

The telephone line

CH1817

Page 1

FEATURES

x Low Profile, Ultra small size: 1.0” x 1.0” x 0.35”

x Complete DAA function

x Ring detection

x Built-in 2-wire to 4-wire conversion

x Lightweight

x Multimedia compatible

x +5V operation

x 1000 VAC isolation

x 800 Volt surge protection

x V.32bis/14,400bps, applications

x UL1459 recognized

x CH1817-L: Low power consumption and Common

x CH1817-LM (special order):

x CH1817-D: Differential transmission input and 0dB

Figure 1. CH1817 DAA Functional Block Diagram.

OFFHK

XMIT

RCV

mode noise rejection filter

attenuation

transmission insertion loss.

CONVERTER

ISOLATION

HYBRID

2W/4W

Document No. 607-0007 Revision B (01/02)

PROTECTION

GND

CIRCUITRY

OFF-HOOK

RING DET.

SWITCH

SURGE

Reduced transmit

AND

RING

TIP

Related parts for ch1817lm

ch1817lm Summary of contents

Page 1

Family of Low Profile DAA Modules INTRODUCTION The CH1817 is a Family of Low Profile Data Access Arrangement (DAA) Modules. with all modem chip sets. These devices have been tested to meet or exceed FCC Part 68 requirements and are ...

Page 2

Cermetek Microelectronics, Inc. Hook Switch. The OFFHK input is used to control the on-hook and off-hook status of the CH1817. When OFFHK is low, the CH1817 is in the On-Hook State. This indicates to the CO that the CH1817 is ...

Page 3

Cermetek Microelectronics, Inc. Pin Name I/O 1 TIP I/O TIP. Direct telephone line connection. 2 RING I/O RING. Direct telephone line connection. 3 OFFHK I OFF HOOK. When set LOW, the CH1817 is placed On-Hook. When set HIGH, the CH1817 ...

Page 4

Cermetek Microelectronics, Inc. CH1817-L: LOW POWER The L Family is a Low Power version of the CH1817 DAA. When Off-Hook, this DAA draws only 4mA through When On-Hook, the L Family can be configured so that the ...

Page 5

Cermetek Microelectronics, Inc. Figure 3. Telephone Line Interface. 1. RJ-11 Jacks must be provided by one of the vendors on the list. Refer to Application Note #130, Summary of Recommended Suppliers. 2. Current Line Device: F1 and F2 – 1.25amp. ...

Page 6

Cermetek Microelectronics, Inc. Table 2. Parameter Supply Current Off-Hook Off-Hook Transmission Attenuation between transmit input and telephone line at Insertion Loss 1800Hz with 600Ohm termination: CH1817-L measured XMIT(+) with respect to GND CH1817-DM measured XMIT(-) with respect to XMIT(+) CH1817-LM ...

Page 7

... Model CH1817D UL1459 Listed, XMIT attenuated by 0.0dBm, Differential input CH1817L UL1459 Listed, XMIT attenuated by 9.5dBm, Single ended input CH1817LM UL1459 Listed, XMIT attenuated by 6.5dBm, Single ended input CH1817DM UL1459 Listed, XMIT attenuated by 6.5dBm, Differential input CH1817ET* UL1459 Listed, XMIT attenuated by 9.5dBm, Single ended input CH1817LET* UL1459 Listed, XMIT attenuated by 9 ...

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