Datasheet for Cermetek product XE056LCC2

XE056LCC

December 2006

Surface-Mount Slim-Link ® DAA for 56K bps Data Transfer

Description

Models

The XE056LCC is a complete telephone line

XE056LCC1 - open PCB

interface or DAA supporting 56K bps data transfer

XE056LCC2 - shielded module

in a leadless, surface-mount package. It is an

Features

alternative to discrete DAA’s for high-speed dial-

up communications. The XE056LCC replaces 25

* Leadless design compatible with a 68-Pin

to 30 discrete components.

PLCC footprint for high-volume assembly

* Meets line interface requirements for reliable

In spite of being less than 1 inch square, the

voice, audio and data communications;

XE056LCC does not sacrifice performance for its

small size and surface-mount convenience. The

* Typical Total Harmonic Distortion -77 dB ;

wide bandwidth, low distortion design supports

* FCC Part 68 Compliant;

data transfer with even V.90 and V.92 modulation.

* Integrated Low-Distortion Telephone Line

The XE056LCC includes the telephone line

Transformer

transformer, loop current holding circuit, hook-

* Ring Detection;

switch and ring indicator. The XE056LCC

* Operates on a Single +5 Volt or + 3 Volt

complies with FCC Part 68 rules for direct

Power Supply;

connection to the telephone line.

* Solid-State Hook-switch Control;

* Internal metallic surge protection provided;

* Extended Temperature Ranges available;

XE056LCC BLOCK DIAGRAM

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XE056LCC

XE056LCC2 Mechanical Specifications

Inches

Dim

Min

Max

Min

Max

0.950

0.960

24.13 24.38

0.950

0.960

24.13 24.38

0.345

0.355

8.76

9.02

0.095

0.105

2.41

2.67

0.795

0.805

20.19 20.45

0.070

0.080

1.90

2.03

0.040

0.050

1.02

1.27

0.055

0.065

1.40

1.65

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XE056LCC

XE056LCC PCB Layout Recommendations

The XE056LCC is a leadless part. The pads on your printed circuit board must align with the pads on the

bottom of the DAA mdule. Below is the recommended PCB layout. Do not place trace or components

under the DAA as this could compromise the network isolation.

Typical

Dim

(inches)

Description

0.100

Pad Length

0.045

Pad Width

0.100

Pad-to-Pad Spacing

0.800

Pin 1 to Pin 9 Spacing

0.950

Row-to-Row Spacing

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XE056LCC

XE056LCC Pin Descriptions

Name

Description

N/C

No Connection

N/C

Ring

XE056LCC

N/C

Ring

Ring is half of the two-wire telephone

Tip

(top)

N/C

line connection (RJ11 Pin 4). FCC

N/C

Part 68 Rules require a 1500 volt

N/C

isolation barrier between the phone

N/C

line and all other circuits. This

N/C

/OH

isolation must be preserved through-

N/C

VCC

out the system. Xecom recommends

N/C

Gnd

0.100 inch spacing between the Tip

and Ring traces and all other

XE056LCC Pin Configuration

conductors to preserve this isolation.

Tip

Tip is the other half of the two-wire telephone line connection (RJ11 Pin 3). The telephone

company places a DC "Battery" voltage across Tip and Ring on all public switched

telephone lines. The XE056LCC works regarless of the polarity of the battery voltage.

4-9

N/C

No Connection

GND

Ground connection to the XE056LCC. Pin 10 supplies the reference for the RI input and

/OH output and should connect to the systems digital ground.

VCC

+5 or +3 Volt power source for the XE056LCC. VCC powers the RI and OH control

lines.

/OH

Active low Switch-hook control. A low on /OH closes the switch-hook causing the DAA

to seize the local telephone line. Raising /OH drops the telephone line connection.

/OH can be pulsed to simulate rotary dialing. When rotary dialing, a series of pulses

represents each digit. (One pulse for the digit one to ten pulses for the digit zero.) These

pulses are created by a momentary closure of the hook-switch. The pulse rate in the US

is 10 pulses per second. The pulses must be asymmetrical with the hook-switch closed

for 31 milliseconds then open for 69 milliseconds. A delay of at least 100 milliseconds is

required between digits.

N/C

No Connection

T2 and T1 provide the differential analog signal input/output connecting directly to the

secondary side of the XE056LCC line transformer. To match the impedance of the DAA

to the 600 ohm telephone line, a 340 ohm resistor is required on T1 or T2.

T1 and T2 provide the differential analog signal input/output connecting directly to the

secondary side of the XE056LCC line transformer. To match the impedance of the DAA

to the 600 ohm telephone line, a 280 ohm resistor is required on T1 or T2.

16-17 N/C

No Connection

Active High Ring Indicate output. RI provides a square wave representation of the Ring

signal present on Tip and Ring. This permits intelligent monitoring of the incoming

ring.

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XE056LCC

Typical Connections Diagram

FB1

Ring

RJ11

FB2

Tip

140 Ω

XECOM 14 T2

140 Ω

XE056LCC

0.15

/OH

58K

VCC

Gnd

42K Ω

3.3 V

Recommended Parts

C1, C2

470 pFd, 1500 Volts; C1 and C2 may be required for EMI filtering to prevent unintended

radiation when the telephone cable is attached to your system. These capacitors must be

rated at a minimum of 1500 volts to maintain the isolation required by FCC Part 68 Rules.

FB1., FB2 FB1 and FB2 are ferrite beads provided for EMI filtering. Xecom recommends the TDK

ACB2012L-120 which provides more than 100 ohms impedance above 100 MHz.

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XE056LCC

Slim-Link ® PLCC Soldering Instructions

Because of its Hybrid construction, the XE056LCC DAA is subject to damage if over exposed to heat

during solder reflow operations. Following the soldering instructions below will ensure that the process

of soldering the module to the board does not damage the DAA.

Maximum Temperature

220 O C

Maximum Time at 220 O C

20 Seconds

Maximum Time above Eutectic (180 O C)

90 Seconds

Maximum Preheat Dwell Time

180 Seconds

Maximum Recommended Solder Temperature Profile

220 O C

180 O C

150 O C

-20 sec-

------------------------------180 sec max-------------------------

max

----- 90 sec max -----

Notes:

Do not expose the XE056LCC DAA module to direct Infrared (IR) heating. If your process includes

direct IR heating, you must shield the DAA module from the infrared radiation.

Xecom’s XE056LCC DAA modules should be exposed to no more than one reflow cycle.

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XE056LCC

XE056LCC Applications Notes

Dialing:

Signal Levels:

The XE056LCC supports both tone and rotary

FCC Part 68 Rules set the maximum level of all

(pulse) dialing. Tone dialing requires an external

signals on the telephone line other than live voice.

signal source to generate the dialing tones. Rotary

Signal levels are measured in dBm; 0 dBm is 1

dialing is accomplished by pulsing the /OH line.

milliwatt through a 600 ohm load. Dialing tones

may have a combined signal level of up to 0 dBm;

Pulse Dialing: Dialing pulses are created by

all other signals are limited to a maximum of -9

momentarily closing the switch-hook. Each digit

dBm.

is represented as a series of pulses; one pulse for

the digit one, two pulses for a two, up to ten

Insertion Loss: There is some loss of signal

pulses for a zero. The pulse rate is ten pulses per

strength as the signal passes through the DAA.

second. These dialing pulses are asymmetrical.

This "insertion" loss should be considered when

For the correct duty cycle consult with the local

placing signals across T1 and T2 for transmission.

country regulations. An inter-digit delay of at least

The typical insertion loss of the XE056LCC is 6

one hundred milliseconds separates the digits.

dB.

Tone Dialing: To permit tone dialing the /OH line

Total Harmonic Distortion:

msut be activated to seize the line. Dialing tones

Total harmonic distortion measures the quality of

can then be presented on T1 and T2. Each digit

the DAA signal path quality. The primary sources

consists of a unique DTMF, Dual Tone Multiple

of distortion are the telephone line transformer and

Frequency, tone pair. Transmit teh tones for a

the line current holding circuit, although board

minimum of 70 milliseconds with a minimum of

layout and other factors can introduce distortion.

70 milliseconds between digits.

Total harmonic distortion varies with frequency.

Below is a list of the DTMF signal frequencies.

The telephone line provides a frequency band of

100 to 4000 Hz. High speed modems using V.90

Digit

Lower Tone

Upper Tone

and V.92 protocols require virtually all of this

697

1209

bandwidth. Even if the total harmonic distortion is

697

1336

very good in the center of the spectrum, distortion

697

1477

elsewhere will adversely affect data transmission.

770

1209

770

1336

770

1477

852

1209

852

1336

852

1477

941

1336

941

1209

941

1477

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XE056LCC

XE056LCC Applications Notes

2/4 Wire Conversion:

Two-way communications over a two-wire telephone line requires that the transmit and receive signal share

the available bandwidth. The 2/4 wire convertor separates these signals at the host interface. Most modem

analog front end chips incorporate an internal 2/4 wire convertor.

If you are using the XE056LCC for an application other than a modem, such as audio, or your modem

analog front end does not provide the 2/4 wire convertor, you will need to provide a discrete 2/4 wire

convertor. Figure 12 shows a simple 2/4 wire convertor circuit.

R2=22k

R1=10k

2 _

3 +

TL082C

R5=11K

R4=40k

R3=20k

R6=10K

The performance of the 2/4 wire convertor is measured by its Transhybrid Loss. The Transhybrid Loss

shows how much the 2/4 wire convertor attenuates the transmit signal on the received data path. The

circuit above provides a typical Transhybrid Loss of 20 dB. The value of R3 can be changed to improve

the Transhybrid Loss.

The Transhybrid Loss will vary with the quality of the impedance match to the telephone line. The

impedance presented to the telephone line isa a funciton of the impedance matching resistor, RT.

Variations from line to line mean that a perfect impedance match is rarely achieved.

The 2/4 wire convertor also amplifies the transmit and receive signals to compensate for the insertion

loss of the DAA. This circuit provides 6 dB gain of both the transmit and receive signals. The values of

R1 and R2 set the transmit gain. The values of R4 and R5 set the receive gain.

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XE056LCC

Electrical Specifications (Vcc=+5v ±10%, Ta=0 to 70 deg C)

Parameter

Conditions

Min

Typ

Max

Units

Power Supply Current

Off-hook

On-hook

0.5

Transmit Insertion loss

600 Ohm Impedance, 1800 Hz

4.5

6.0

7.0

Receive Insertion loss

600 Ohm Impedance, 1800 Hz

4.5

6.0

7.0

Matching Impedance

Input to T1 and T2

266

280

294

ohms

Line Impedance

RT equals 340 ohms

540

600

660

ohms

Total Harmonic Distortion

600 Ohm Impedance,

-72

-77

200 to 4000 Hz

Ring Detect Sensitivity

Tip & Ring voltage;

150

Vrms

Type B ringer

Ring Frequencies Range

RI Output Voltage

No Ring signal, Low output

0.2

0.5

Volts

(active high)

Ring signal present, High output 2.0

5.0

Volts

Hook-Switch Control

ON: (off-hook)

0.2

0.5

Volts

Voltage (active low)

OFF: (on-hook)

2.0

3.0

Volts

Hook-Switch Control

ON: (off-hook)

milliamps

Current

OFF: (on-hook)

uamps

Loop Current

Off-Hook

100

DC On-Hook Impedance

Hook-switch Open

MOhms

XE056LCC Absolute Maximum Ratings

Storage Temperature

-25 O C to +85 O C

Operating Temperature Range *

0 O C to +70 O C

* The XE056LCC can be ordered with an Operating Temperature of -40 O C to +85 O C at extra cost.

Order Model Number XE056LCC-ITR

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XE056LCC

XE056LCC FCC Part 68 Information

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

a Data Access Arrangement (DAA) approved by the appropriate governmental agency. In the US this

agency is the Federal Communications Commission (FCC), while in Canada it is Industry Canada (IC).

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 XE056LCC has been designed to meet all FCC Part 68 requirements for hazardous voltage, line

impedance and leakage current. If the system transmits data, synthesized voice, 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

3995 Hz

4005 Hz

-27 dBm

4005 Hz

12 kHz

-20 dBm

12 kHz

90 kHz

-55 dBm

90 kHz

270 kHz

-55 dBm

270 kHz

6 MHz

-15 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 XE056LCC 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 XE056LCC 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 XE056LCC. This is

generally accomplished through an independent testing lab which tests the System and submits the proper

paperwork to the FCC for approval. Since the XE056LCC already complies with FCC Part 68 rules, this is

a relatively simple process.

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XE056LCC

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 re-

garding the freedom of the described devices from patent infringement. XECOM makes no warranty of merchant-

ability 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 appli-

cations, such as military, medical life-support or life-sustaining equipment, are specifically not recommended with-

out 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 instruc-

tions provided 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 specifica-

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

trademarks and/or registered trademarks of their respective companies.

Xecom Incorporated

374 Turquoise Street, Milpitas, CA 95035

Ph:408-942-2200 Fax:408-942-1346

Email: info@xecom.com

Web Site: http://www.xecom.com

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XE056LCC