Cermetek Datasheet for Products XE0052ST and XE0052ST

XE0052S &XE0052T

5/99

Slim V.34 Telephone Line Interface with 2/4 Wire Hybrid

Description

Features

The XE0052S and XE0052T are compact telephone in-

Small Size: just 1.5" by 0.5" by 0.32";

terface modules which support V.34 communications at

FCC Part 68 Compliant;

data rates to 33,600 bps yet are just 0.31 inches thick

Internal 2-4 wire convertor separates transmit and

and comply with FCC Part 68 Rules for connection to

receive signals

the public telephone network.

Two Ring Detect Options;

The XE0052S and XE0052T are complete DAAs.

XE0052S1/S2: - Continuous Low Level

They include the 2-4 wire convertor to separate trans-

XE0052T1/T2 - Ring Signal Pulses

mit and receive signals, ring detection, and the switch

Single +5V Operation;

hook to control line access. The two models differ only

Hookswitch Control

in their RI outputs. The XE0052S has an integrated RI

output which remains low for the duration of the ring.

Compatible with V.34 data transfer

The XE0052T RI output is not integrated and provides

Two Mechanical Variations

a pulse train at twice the ring frequency.

XE0052S1/T1 - Vertical Mount

XE0052S2/T2 - Horizontal Mount

Xecom offers two mechanical variations for each of the

XE0052S and XE0052T. The XE0052S1/T1 mount

vertically to consume minimal board space. The

XE0052S2/T2 mount horizontally to maintain a low

profile. Both versions are electrically identical and

share the same pin configuration.

XE0052 Block Diagram

TIP

2 TO 4

SURGE

LINE

WIRE

AND

CURRENT

CONVERTER

PROTECTIVE

CIRCUIT

RING

NETWORK

HOOK-

SWITCH

CONTROL

RING

DETECT

CIRCUIT

XECOM

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XE0052

XE0052S1 and XE0052T1 Mechanical Specifications

Pin 1

Vertical Package

Inches

Millimeters

Dim

Min

Max

Min

Max

0.300

0.320

7.62

8.13

0.490

0.510

12.45

12.95

1.490

1.510

37.85

38.35

0.040

0.060

1.02

1.52

1.390

1.410

35.31

35.81

0.090

0.110

2.29

2.79

0.790

0.810

20.07

20.57

0.125

0.200

3.18

5.08

XECOM

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XE0052

XE0052S2 and XE0052T2 Mechanical Specifications

Pin 1

Horizontal Package

Inches

Millimeters

Dim

Min

Max

Min

Max

0.490

0.510

12.45

12.95

0.320

0.330

8.13

8.38

1.490

1.510

37.85

38.35

0.040

0.060

1.02

1.52

1.390

1.410

35.31

35.81

0.090

0.110

2.29

2.79

0.790

0.810

20.07

20.57

0.125

0.200

3.18

5.08

0.440

0.450

11.18

11.43

XE0052 Pin Configuration (Top view)

/RI

RX VCC Gnd TX

Tip Ring

XECOM

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XE0052

XE0052 Pin Descriptions

Name

I/O

Description

Ring

---

Ring connection to the phone line (RJ11 Pin 4). The Ring pin has 1500 volts isolation

from the rest of the circuitry. This isolation must be preserved throughout the system.

Tip

---

Tip Connection to the phone line (RJ11 Pin 3). The Tip pin has 1500 volts isolation

from the rest of the circuitry. This isolation must be preserved throughout the system.

Hookswitch relay control. A high on OH closes the internal relay and connects the

equipment to the telephone line.

TX provides the analog input signal to the 2-4 wire convertor of the XE0052S. TX

uses a 2.5 volt reference signal and therefore must be capacitively coupled to the host

equipment.

GND

Ground

VCC

---

+5 Volts supply power

RX provides the analog output signal from the 2-4 wire converter of the XE0052S. RX

uses a 2.5 volt reference signal and therefore must be capacitively coupled to the host

equipment.

/RI

Ring Indicate, output, active low, TTL. On the XE0052S a low on /RI indicates the

modem is receiving a ring signal. The XE0052T provides a pulse string at twice the

ring frequency when a ring is detected.

XE0052 Absolute Maximum Ratings

-25 C to +85 C

Storage Temperature

0 C to +70 C

Operating Temperature Range

260 C

Maximum Lead Temperature

(soldering 2 seconds per wave)

XECOM

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XE0052

XE0052 Electrical Specifications (VCC = 5V + 10%, Ta = 0 to 70C)

Parameter

Conditions

Min

Typ

Max Units

Power Supply Current

Ring Indicate Active

Transmit Insertion loss

600 Ohm Impedence, 1000 Hz

Receive Insertion loss

600 Ohm Impedance, 1000 Hz

Line Impedance

At 1000 Hz

540

600

660

Ohms

Transhybrid Loss

Attenuation between transmiter input and

receiver output at 1KHz with 600 ohm

line termination

Ring Detect Sensitivity

Min. AC voltage between Tip & Ring

Vrms

Type B ringer

Ring Detect Peak Current

Ringing voltage of 40 Vrms applied

100

between Tip & Ring

Ring Detect Idle Current

No Ringing Voltage present

Ring Indicate Output

Ring Voltage present on Tip and Ring

0.2

0.5

Volts

Loop Current Switch

ON: (off-hook)

2.0

3.0

Volts

Control Voltage

OFF: (on-hook)

0.2

0.5

Volts

Loop Current Switch

Off-Hook

0.5

Control Current

XE0052 Typical Connection Diagram

+5 Volts

XE0052S or XE0052T

Modem Analog

/RI Rx Vcc Gnd Tx OH

Tip Ring

Front End

10 ohms, 1/2 W

/Ring

FerriteBead

RJ11

Teccor

P3100SB

Receive

FerriteBead

10 m Fd

10 ohms, 1/2 W

470 pFd

Transmit

3000 Volts

10 m Fd

OHRLY

XECOM

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XE0052

XE0052 FCC Instructions

When developing a product to be connected to the telephone line, it is necessary to use a circuit described as a Data Access

Arrangement (DAA) which is approved by the appropriate governmental agency. In the US, for example, this agency is the Federal

Communications Commission (FCC), while in Canada it is the Department of Communications (DOC). These agencies test and

approve the product to ensure that it meets their specifications, thereby protecting the telephone system from damage and

protecting the user from high voltage transients (such as lightning strikes) which may come down the telephone line.

The XE0052 has been designed to meet all FCC Part 68 requirements for hazardous voltage, surge protection and leakage current.

If the system developed transmits data, or DTMF tones on the telephone line, the user must certify that the signals transmitted meet

basic FCC requirements for maximum transmission levels, out of band energy and billing delay. Full details may be obtained from

the FCC under Part 68 of the FCC Rules and Regulations, or in Title 47 of the Code of Federal Regulations, however the basic

requirements are as follows:

1. Maximum Transmit Level

For the normal “permissive” (standard) telephone line, equipment which transmits data (such as a modem) must not exceed a

transmission level of -9 dBm.

2. Out of Band Energy

Data equipment must not transmit “out of band” energy on the telephone line which exceeds the following limits:

Frequency

Range

Max. Power

200Hz

3990Hz

-9 dBm

3990Hz

4005Hz

-27 dBm

4005Hz

16kHz

-16 dBm

8kHz

94kHz

-47 dBm

86kHz

270kHz

-46 dBm

270kHz

6MHz

-6 dBm

3. DTMF Transmission Level

If the system is capable of DTMF dialing, the maximum DTMF transmission level must be less than 0 dBm averaged over a 3

second interval.

4. Billing Delay

A delay of 2 seconds or greater is required after the time the XE0052 is taken “off hook” and before any information is transmitted.

This is required to ensure that billing information may be exchanged between telephone company central offices without

interference.

The user of the XE0052 must certify to the FCC that the final system meets the requirements of Part 68 which include the criteria

above as well as the high voltage protection provided by the XE0052. This is generally accomplished through an independent

testing lab which tesst the System and submits the proper paperwork to the FCC for approval. Since the XE0052 already complies

with FCC Part 68 rules, this is a relatively simple proces s.

XECOM

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XE0052

Terms of Sale

Devices sold by XECOM are covered by the warranty provisions appearing in its Terms of Sale only. XECOM

makes no warranty, express, statutory, implied, or by description regarding the information set forth herein, or

regarding the freedom of the described devices from patent infringement. XECOM makes no warranty of

merchantability or fitness for any purposes. XECOM reserves the right to discontinue production and change

specifications and prices at any time and without notice. This product is intended for use in normal commercial

applications. Applications requiring extended temperature range, unusual environmental requirements, or high

reliability applications, such as military, medical life-support or life-sustaining equipment, are specifically not

recommended without additional processing and authorization by XECOM for such application.

Xecom assumes no responsibility for the use of any circuitry other than circuitry embodied in a Xecom product.

No other circuits, patents, or licenses are implied.

Life Support Policy

Xecom's products are not authorized for use as Critical Components in Life Support Devices or Systems.

Life Support Devices or Systems are devices or systems which, (a) are intended for surgical implant into the body,

or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions pro-

vided in the labeling, can be reasonably expected to result in significant injury to the user.

A Critical Component is any component of a life support device or system whose failure to perform can be rea-

sonably expected to cause failure of the life support device or system, or to affect its safety or effectiveness.

While Xecom, Inc. has made every effort to ensure that the information presented here is accurate, Xecom will not

be liable for any damages arising from errors or omission of fact. Xecom reserves the right to modify specifications

and/or prices without notice. Product mentioned herein are used for identification purposes only and may be trade-

marks and/or registered trademarks of their respective companies.

Xecom Incorporated

374 Turquoise Street, Milpitas, CA 95035

Ph:408-945-6640 Fax:408-942-1346

Email: info@xecom.com

XECOM

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XE0052