Datasheet XE056J Datasheet (XECOM)

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Page 1

XECOM (1) XE056J

XE056J

7/99

Slim-Link R PLCC DAA for 56kBPS Data Transfer

Description

The XE056J is a complete DAA supporting 56 KBPS data transfer in a compact, surface-mount package. It is an alternative to discrete DAA’s for high-speed communications. The XE056J replaces 25 to 30 discrete components with a single, assembled unit. The XE056J package fits a 68 pin PLCC socket permitting automated, high-volume assembly .

The XE056J does not sacrifice performance for small size and surface-mount convenience. The wide bandwidth, low distortion design supports analog data transfer to 56 KBPS.

Like all Xecom DAA's the XE056J is a complete DAA. It includes the telephone line transformer, loop current holding circuit, hookswitch and ring indicator. The XE056J complies with FCC Part 68 rules for direct connection to the telephone line.

Features

* Modified 68-Pin PLCC package for high-volume

assembly

* Meets line interface requirements for reliable 56

Kbps modems;

* High Performance: Typical Total Harmonic

Distortion -85 dB ; * FCC Part 68 Compliant; * Integrated Low-Distortion T elephone Line

Transformer * Ring Detection, active high and active low options

available; * Operates on a Single +5 Volt or + 3 Volt Power

Supply; * Solid-State Hookswitch Control, active high and

active low options available; * Internal metallic surge protection provided; * Extended Temperature Ranges available;

XE056J BLOCK DIAGRAM

Line Trans-

former

Line Current

Holding Cir-

cuit

Hookswitch

Ring De-

tector

Tip

Ring

metallic

surge sup-

pression

Low Imped-

ance Dialing

/MUTE

Billing Tone

Filter

(Optional)

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XECOM (2) XE056J

XE056J Ordering Information

XE056J Mechanical Specifications

h x 45 degrees

(3 Places)

(top)

Index Corner

J x 45 degrees

(bottom)

A 0.280 0.300 7.11 7.62

A1 0.020 REF 0.508 REF

b 0.017 0.021 0.432 0.533

D 0.985 0.995 25.02 25.27 D1 0.952 REF 24.18 REF D2 0.800 REF 20.32 REF D3 0.910 0.930 23.11 23.62

e 0.100 BSC 2.54 BSC

h 0.010 TYP 0.254 TYP

J 0.045 Typ 1.15 TYP

a45

TYP 45o TYP

Coplanarity 0.004 Max 0.10 Max

Inches Millimeters

Dim Min Max Min Max

The standard version of the XE056J is the XE056JLHGU. The L indicates that the off-hook control is an active low; the H indicates that the Ring Indicate output is an active high; the G indicates General Purpose feature set, and the U indicates the North American country configuration.

There are a number of variations of the XE056J which can be provided on special order. We offer a choice in the polarity of the Ring Indicate and Off-Hook signals plus variations for many different countries. We also anticipate adding many new features and options in future versions of this product. Please contact your Xecom sales representative for the correct model number when ordering any of these special versions of the XE056J.

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XECOM (3) XE056J

XE056J Pin Descriptions

18 17 16 15 14 13 12 11 10

RI N/C N/C T1 T2 Mute OH VCC Gnd

N/C

Ring

Tip

N/C L1 (Opt) L2 (Opt)

N/C

XE056J

(top)

1 2 3 4 5 6 7 8 9

Figure 4: XE056J Pin Configuration

Pin Name Description

1 N/C No Connection 2 Ring Ring is one wire of the two-wire telephone line

connection (RJ11 Pin 4). FCC Part 68 Rules require a 1500 volt isolation barrier between the telephone line and all other circuits. This isolation must be preserved throughout the system. Xecom recommends 0.100 inch spacing between traces connected to Ring and all other conductors to preserve this isolation.

3 Tip Tip is one wire 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 XE056J accept this line battery voltage without regard to its polarity.

4 N/C No Connection

5, 6 L2 L1 and L2 provide the points to connect a five

millihenry inductor. This inductor completes the 16 KHz German billing tone filter.

7-9 N/C No Connection

10 GND Ground connection to the XE056J. This signal

provides the reference for the OH output and RI input. This pin should be connected to the systems digital ground.

11 VCC +5 or +3 Volt power source for the XE056J.

VCC powers the RI and OH control lines.

Pin Name Description

12 OH Switch-hook control to the modem. OH is

normally an active low input. OH is available as an active high input by special order. Activating OH closes the switch-hook causing the XE056J to seize the local telephone line. The telephone line connection is dropped when OH is deactivated.

The host can pulse OH to simulate rotary dialing. The pulse rate in the US is ten pulses per second. Each digit is dialed as a series of pulses created by closure of the hook-switch. (one pulse for the digit one to ten pulses for the digit zero) The pulses must be asymmetrical so that the hook-switch is closed for thirty-one milliseconds and open for sixty-nine milliseconds. An inter-digit delay of at least one hundred milliseconds is required.

13 Mute Mute is an optional signal on the XE056J.

Countries which require low impedance dialing, such as Italy, use the Mute signal to pulse dial.

14 T2 T2 in conjunction with T1 provides the

differential input/output for the analog signal. T2 connects directly to the secondary side of the line transformer embedded into the XE056J. To match the impedance of the DAA to the 600 ohm telephone line, a 280 ohm resistor is required on T1 or T2.

15 T1 T1 in conjunction with T2 provides the

differential input/output for the analog signal. T1 connects directly to the secondary side of the line transformer embedded into the XE056J. 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

18 RI Ring Indicate output from the modem. RI is

normally active high. RI is available as an active low output by special order. RI provides a square wave representation of the Ring signal present across Tip and Ring. This permits intelligent monitoring of the incoming ring. The XE056J recognizes ring voltages of thirtyeight to one hundred fifty volts RMS in the frequency range of sixteen to sixty-eight Hertz.

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XECOM (4) XE056J

Typical Connections Diagram for North America and Japan

Recommended Parts

Designation Description

C1, C2 47 picofarad, 3000 Volts (Sprague Part Number 30GA-T47)

FB1, FB2 Ferrite Beads (TDK Part Number CB30-453215B)

Conexant RC336ACF

RINGD

TXA1

RIN

TXA2

-OH

18 RI 1 17 Ring 2 16 Tip 3 15 T1 4 14 T2 L2 5 13 Mute L1 6 12 \OH 7 11 VCC 8 10 GND 9

XECOM

XE056JLHGU

RJ11

280 ohms

2 K

10 K

27 K

FB1

FB2

C1 C2

4 3

+5 Volts

XE056J ABSOLUTE MAXIMUM RATINGS

Storage T emperature -25O C to +85O C

Operating T emperature Range * 0O C to +70O C

Maximum Solder T emperature 220O C

Maximum Time Above Eutectic (183O C) 90 seconds

Preheat Dwell Time 120 to 180 seconds

* The XE56J can be ordered with an Operating T emperature of -40O C to +85O C at extra cost.

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XECOM (5) XE056J

XE056J Applications Notes

Dialing:

The public switched telephone network permits tone and rotary (pulse) dialing. The XE056J supports both types. Tone dialing requires an external signal source to generate the dialing tones. Rotary dialing is accomplished by pulsing the OH line on the XE056J.

Pulse Dialing: The XE056J generates dialing pulses through momentary closures of the switch-hook. (In some countries pulsing of the MUTE signal is required to meet local pulse dialing rules.) Each digit is represented as a series of pulses, one pulse for a one to ten pulses for a zero. The pulse rate varies from ten pulses per second in North America to 20 pulses per second in Europe. The dialing pulses are asymmetrical. To achieve the correct duty cycle consult with the local country regulations. An inter-digit delay of at least one hundred milliseconds separates the digits.

Tone Dialing: To permit tone dialing the XE056J seizes the line, OH active. For each digit a unique DTMF, Dual Tone Multiple Frequency, tone pair is placed across T1 and T2. The higher frequency tone is always larger than the lower frequency one. Transmit the tones for a minimum of 70 milliseconds, and leave a minimum of 70 milliseconds between digits.

The chart below shows the correct DTMF signal frequencies for each digit.

Digit Lower Tone Upper T one

1 697 1209 2 697 1336 3 697 1477 4 770 1209 5 770 1336 6 770 1477 7 852 1209 8 852 1336 9 852 1477 0 941 1336 * 941 1209 # 941 1477

Signal Levels:

FCC Part 68 Rules set the allowable signal level in the US for all signals placed on the telephone line other than live voice. Other countries have similar regulations. Signal levels are measured in dBm. Zero dBm is 1 milliwatt through a 600 ohm load.

Insertion Loss: There is some loss of signal power as the information signal passes through the XE056J. This "insertion" loss should be taken into account when placing signals across T1 and T2 for transmission. The typical insertion loss of the XE056J is 6 dB.

Total Harmonic Distortion:

Total harmonic distortion is the most common measure of the signal path quality provided by the DAA. The primary sources of this distortion are the telephone line transformer and the line current holding circuit, although board layout and other factors can introduce distortion.

Total harmonic distortion varies with frequency. The voice band provided by the telephone line is limited to under 4000 Hz. High speed modems such as 33.6 KBPS and 56KBPS require virtually all of this bandwidth for signal transmission. Even if the total harmonic distortion of a device is very good in the center portion of the spectrum,signal quality is compromised if distortion greatly increases at the outer limits of the voice band. The figure below shows the typical total harmonic distortion of the XE056J across the entire voice band.

Total Harmonic Distortion

Total Harmonic Distortion:

Note: This chart represents the total harmonic distortion of the

complete DAA not just the telephone line transformer. Distortion measurements of the transformer only will show much lower distortion.

50 100 200 500 1000 1500 2000 4000

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XECOM (6) XE056J

2/4 Wire Conversion:

Full Duplex communications over a two-wire telephone line requires that transmit and receive signal share the available bandwidth. The two-to-four wire convertor separates these signals at the host interface. Most modem analog front end chips incorporate an internal 2/4 wire convertor making it unnecessary to provide one in the DAA.

If you are using the XE056J for an application other than a modem, such as voice processing, 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.

XE056J Applications Notes

2/4 Wire convertor

The performance of the 2/4wire convertor is measured by its Transhybrid Loss. The Transhybrid Loss shows how much he 2/4 wire convertor attenuates the transmit signal on the received data line. The circuit above provides a typical Transhybrid Loss of 20 dB.

The Transhybrid Loss will vary with the quality of the impedance match to the telephone line. Even when the recommended value for the impedance matching resistor, R6, is used variations from line to line alter the impedance match. The value of R3 can be changed to improve the Transhybrid Loss.

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.

Transmit

Receive

4558

20K

10K

280 ohms

40K

11.5K

XE056J

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XECOM (7) XE056J

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

Power Supply Current Off-hook 10 mA

On-hook 0.5 mA

Transmit Insertion loss 600 Ohm Impedance, 1800 Hz 4.5 6.0 7.0 dB

Receive Insertion loss 600 Ohm Impedance, 1800 Hz 4.5 6.0 7.0 dB

Line Matching Impedance Input to T1 and T2 266 280 294 ohms

Line Impedance see figure 5 540 600 660 ohms

Total Harmonic Distortion 600 Ohm Impedance, 200 to 4000 Hz -80 -85 dB

Ring Detect Sensitivity Min. AC voltage between Tip & 38 150 Vrms

Ring Type B ringer

Ring Frequencies Detected 16 68 Hz

RI Output Voltage Ring signal present, Active low 0 .2 0.5 Volts

Ring signal present, Active High 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) 2.0 3.0 Volts Voltage (active high) OFF: (on-hook) 0.2 0.5 Volts

Hook-Switch Control ON: (off-hook) 5 10 milliamps Current OFF: (on-hook) 5 microamps

Loop Current Off-Hook current draw from 20 100 mA

Telephone Line

DC On-Hook Impedance Hookswitch Open 10 MOhms

Parameter Conditions Min Typ Ma x Units

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XECOM (8) XE056J

XE056J 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 XE056J 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 to 4005 Hz -27 dBm 4005 Hz to 12 kHz -20 dBm 12 kHz to 90 kHz -55 dBm 90 kHz to 270 kHz -55 dBm 270 kHz to 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 XE056J 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 XE056J 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 XE056J. 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 XE056J already complies with FCC Part 68 rules, this is a relatively simple process.

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XECOM (9) XE056J

Copyright, Xecom © 1999 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 trademarks 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: [email protected]

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

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