XECOM XE0056 Datasheet

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xecom

XE0056

09-97

DAA Module for 33,600 bps and 56K Analog Modems

Description

Xecom created the XE0056 modular DAA specifically for high-speed analog modems. The XE0056 is a complete DAA optimized to pass 33.6K and 56K bps analog modem signals. The XE0056 guarantees the highest speed modem connection supported by the telephone line conditions.

Establishing and maintaining a high-speed data link requires a linear signal response across the full voice band. The DAA must maintain this linearity over a variety of local loop conditions. Xecom engineers used proprietary design tools for realtime analysis of the DAA design. The result is a complete telephone line interface with a typical total harmonic distortion of -85 dB.

Like all Xecom DAA modules, the XE0056 is a complete DAA. It includes the line transformer, line current holding circuit, ring detector, and hookswitch. The XE0056 also complies with FCC Part 68 Rules for direct connection to the telephone network.

Features

*Compatible with analog data transfer to 56K bps;

*Typical Total Harmonic Distortion -85 dB ;

*Small Size:

0.95 inch by 0.925 inch by 0.370 inches;

*FCC Part 68 Compliant;

*Integral Low-Distortion Telephone Line Transformer;

*Ring Detection;

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

*Solid-State Hookswitch Control

*Extended Temperature Ranges available

 

 

 

 

 

Pin Configuration

 

 

 

 

 

 

 

XE0056 Block Diagram

 

Tip

 

 

 

 

 

 

 

 

 

 

 

 

 

Gnd

 

 

 

 

 

 

 

 

 

Tip

 

 

 

1

 

 

XE0056

 

 

9

 

 

 

T1

Line

 

Line Current

 

 

 

Ring

 

 

 

2

 

 

 

 

8

 

 

 

T1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T2

 

Transformer

 

Holding

 

 

Ring

OH

 

 

 

 

 

 

 

 

 

7

 

 

 

VCC

 

 

Circuit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

 

 

 

6

 

 

 

 

OH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RI

 

 

 

4

 

 

 

 

 

5

 

 

 

T2

 

 

 

 

Hookswitch

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RI

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ring

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Detector

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

XECOM

XE0056

XE0056 Mechanical Specifications

 

Inches

Millimeters

 

 

A

Dim

Min

Max

Min

Max

 

 

 

 

 

A

0.905

0.945

22.99

24.00

 

 

 

B

0.930

0.970

23.62

24.64

 

 

B

C

0.360

0.380

9.14

9.65

 

Denotes Pin 1

 

 

 

 

 

D

0.790

0.810

20.07

20.57

 

 

 

E

0.390

0.410

9.91

10.41

 

 

 

F

0.120

0.140

3.05

3.56

 

 

 

G

0.065

0.085

1.65

2.16

 

 

F

 

 

C

H

0.065

0.085

1.65

2.16

 

 

 

 

 

J

0.090

0.110

2.29

2.79

 

H

 

K

0.430

0.450

10.92

11.43

G

 

 

J

 

 

Pins are .010 by .020 inches. All Pins are tin-plated

D

 

E

 

for solderability.

XE0056 Typical Connection Diagram

+5 Volts

Modem Analog

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MOV1

 

 

 

 

Front End

 

 

 

 

 

 

 

 

 

 

 

 

 

XE0056

 

R1

 

 

 

 

 

 

 

FB1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9

Gnd

TIP 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R2

 

 

 

 

 

 

 

FB2

 

 

 

 

 

RJ11

 

RXA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8

T1

RING 2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TXA1

 

 

 

Rm

 

Z1

C1

 

 

 

 

 

 

7

VCC

 

 

 

 

 

 

 

 

 

 

 

 

C2

 

 

 

 

 

C3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Z2

 

 

 

 

6

 

OH 3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TXA2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

 

 

 

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T2

 

RI

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Off hook

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ring Detect

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Recommended Parts

Designation

Description

R1,

R2

15 ohms, 1/2 watt

Rm

Line Impedance Matching Resistor, 280 ohms

C1

.01 microfarad

C2,

C3

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

Z1,

Z2

Zener Diode 4.3 Volts

FB1, FB2

Ferrite Beads (TDK Part Number CB30-453215B)

MOV1

Minimum Breakover 220 volts (Teccor Part Number P2600BA70)

XECOM

(2)

XE0056

Pin Descriptions

PIN

NAME

DESCRIPTION

1

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.

2

Tip

Tip is the second wire of the two-wire telephone line connection (RJ11 Pin 3). 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 Tip and all other conductors to preserve this isolation.

3

OH

OH provides hookswitch control to the modem. OH is an active high input. Activating OH

 

 

closes the hook-switch causing the XE0056 to seize the local telephone line. The telephone

 

 

line connection is dropped when OH is dropped.

 

 

The OH line can be pulsed to simulate rotary dialing. The pulse rate during rotary dialing is

 

 

ten pulses per second. Each digit is dialed as a series of pulses created by closure of the

 

 

hook-switch. (from one pulse for the digit one to ten pulses for the digit zero) The pulses on

 

 

OH 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.

4

/RI

/RI, Ring Indicate, is an active low output from the modem. /RI active indicates the presence

 

 

of an incoming call. The singal on /RI provides a square wave representation of the Ring

 

 

signal. This permits intelligent monitoring of the ring signal. The XE0056 recognizes ring

 

 

voltages of thirty-eight to one hundred fifty volts RMS in the frequency range of sixteen to

 

 

sixty-eight Hertz.

5

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 XE0056.

 

 

To match the impedance of the DAA to the 600 ohm telephone line, a 280 ohm resistor is

 

 

required on T1 or T2.

6

7VCC

8T2

9GND

Not Used

VCC provides +5 Volt power source for the XE0056. VCC powers the /RI and OH control lines.

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 XE0056. To match the impedance of the DAA to the 600 ohm telephone line, a 280 ohm resistor is required on T1 or T2.

Ground connection to the XE0056. This signal provides the reference for the /OH output and /RI input. This pin should be connected to the systems digital ground.

XECOM

(3)

XE0056

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