CH1837F ETC1 [List of Unclassifed Manufacturers], CH1837F Datasheet

CH1837F

Manufacturer Part Number

CH1837F

Description

CH1837A/7F/8A Data Access Arrangement Module V.34bis High Speed DAA Module

Manufacturer

ETC1 [List of Unclassifed Manufacturers]

Datasheet

1.CH1837F.pdf (9 pages)

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2002 Cermetek Microelectronics, Inc.

INTRODUCTION

The Cermetek CH1837A/F Data Access Arrangement

(DAA)

requirements of 33.6Kbps modems, such as V.34bis,

for embedded applications. The CH1837A/F meets or

exceeds the requirements for V.34 and can be used in

lower speed applications as well. The isolation voltage

and surge protection meets, as a minimum, North

American UL1950 Edition 3 (USA) and CSA C22.2

950 (Canada) requirements. Further, the CH1837A/F

has been tested to meet FCC Part 68 and is Canadian

DOT CSA CS-03 Part I approvable.

The CH1837A/F is compatible with all popular V.34bis

modem/fax chip sets.

included in this datasheet. The CH1837A/F offers a

Quick-to-Market DAA solution for high performance

modem designs.

The CH1837A/F is exceptionally well suited for voice-

over-data (VoIP) and other internet-based telephony

and data communication applications.

For those applications not requiring a two to four wire

hybrid converter circuit, the CH1838A provides all the

features of the CH1837A/F (except the hybrid

converter) while offering some cost savings. Note that

the CH1838A is a special order product only. Consult

Cermetek for availability and delivery.

FEATURES

• Low Profile

• Complete DAA function

• Compatible with most popular V.34bis modem chip

• Ring detection circuitry included

• Built-in

• UL1950 Edition 3 Listed and CSA C22.2 950

• 1500 VAC RMS Isolation

• 2122V peak surge protection

• +5V low power operation

• Differential transmission, VoIP applications

• Compatible with V.34bis, V.32bis, V.32, V.22bis,

• FCC Part 68 (USA) and DOT CSA CS-03 Part I

sets

(CH1837A/F only)

Compliant

and V.22

(Canada) Approvable

2-wire

designed

CH1837A/7F/8A Data Access Arrangement Module

4-wire

Application examples are

meet

conversion

V.34bis High Speed DAA Module

the

performance

circuitry

Page 1

DESCRIPTION

AND DISCUSSION OF BASIC OPERATIONS

Figure 1 contains a functional block drawing of the

CH1837A/F. Each CH1837A/F product consists of:

1) Isolation barrier.

2) Off-Hook Switch/Ring Detect circuit.

3) PSTN Line Surge and High Voltage Protection

4) 2-to-4 Wire Conversion circuit.

Figure 1. Function Block Diagram of CH1837A/F.

Figure 2 contains a functional block drawing of the

CH1838A. Each CH1838A product consists of:

1) Isolation Barrier.

2) Off-hook Switch/Ring Detect circuit.

3) PSTN Line surge and High Voltage Protection

Figure 2. Function Block Diagram of CH1838A.

OFFHK

XMIT+

XMIT-

RCV

N/C

Circuitry.

circuitry.

CONVERTER

N/C

ISOLATION

HYBRID

2W/4W

Document No. 607-0014 Revision C2 (12/02)

FUNCTIONAL BLOCKS

PROTECTION

SURGE AND

CIRCUITRY

OFF HOOK

CIRCUITRY

OFF HOOK

VND

RING DET.

VND

RING DET.

SWITCH

RING

TIP

Related parts for CH1837F

CH1837F Summary of contents

Page 1

CH1837A/7F/8A Data Access Arrangement Module INTRODUCTION The Cermetek CH1837A/F Data Access Arrangement (DAA) is designed to meet requirements of 33.6Kbps modems, such as V.34bis, for embedded applications. The CH1837A/F meets or exceeds the requirements for V.34 and can be used ...

Page 2

Cermetek Microelectronics, Inc. Ring Detection. To announce an incoming call, the telephone company’s central office (CO) applies an AC ringing signal to the CH1837A/7F/8A is designed to detect this signal. The CH1837A/7F/8A uses the AC ring signal to produce a ...

Page 3

Cermetek Microelectronics, Inc. TRANSMIT SIGNALS The CH1837A/7F/8A does not attenuate the transmit signal before it applies the signal across tip and ring. Therefore, a transmit signal of –9dBm applied to XMIT will comply with the FCC Part 68 requirement for ...

Page 4

Cermetek Microelectronics, Inc. HANDLING AND RECOMMENDATIONS The CH1837A/7F/8A DAA Module contains static- sensitive components and should only be handled by personnel and in areas that are properly protected against static discharge. Industry standard ESD and EOS procedures and precautions should ...

Page 5

... When answering incoming calls in response to a ring indication on RI, internal degradation may occur if OFFHK is set HIGH before RI returns to its HIGH state. 2. For CH1837A, the RI output is 2X the frequency of the incoming ring signal. 3. For CH1837F, the RI output is 1X the frequency of the incoming ring signal. PIN I/O ...

Page 6

Cermetek Microelectronics, Inc. Table 3. CH1837A/7F/8A Electrical Specifications. Parameter Logic Input HIGH Input LOW Input Leakage HIGH Input Leakage LOW Output HIGH Output LOW Isolation Protection Between TIP and RING Surge Protection Between TIP and RING Transmission Insertion Loss Frequency ...

Page 7

Cermetek Microelectronics, Inc. Figure 5. PSTN Line Interface. 1. Currently Limiting PSTN Protection Line Device. Currently limiting devices are mandatory to meet UL safety standards. For FCC Part 68 approval, the current limiting components identified as F1 and F2 in ...

Page 8

... Order Option to Standard CH1837A/F product. Notes: 1. Pins are 0.010 inches X 0.020 inches. *2. Nominal pin length is 0.200 inches for CH1837A/8A. *3 Nominal pin length is 0.155 inches for CH1837F. 4. Nominal case tolerance ± 0.02 inches. 5. Nominal pin tolerance ± 0.03 inches. Figure 6. Physical Dimensions. 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 ...

Page 9

Cermetek Microelectronics, Inc. 2002 Cermetek Microelectronics, Inc. CH1837A/7F/8A Data Access Arrangement Module Page 9 Document No. 607-0014 Revision C2 (12/02) ...

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