XECOM XE0056 Datasheet
XECOM XE0056
DAA Module for 33,600 bps and 56K Analog Modems
XE0056
09-97
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
xecom
XE0056 Block Diagram
Line
Transformer
Line Current
Holding
Circuit
Hookswitch
Ring
Detector
T1
T2
OH
RI
Tip
Ring
Pin Configuration
1
2
3
4
9
8
7
6
5
Gnd
T1
VCC
T2
Tip
Ring
OH
RI
XE0056
XECOM (2) XE0056
XE0056 Mechanical Specifications
A 0.905 0.945 22.99 24.00
B 0.930 0.970 23.62 24.64
C 0.360 0.380 9.14 9.65
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
H 0.065 0.085 1.65 2.16
J 0.090 0.110 2.29 2.79
K 0.430 0.450 10.92 11.43
Inches Millimeters
Dim Min Max Min Max
Pins are .010 by .020 inches. All Pins are tin-plated
for solderability.
XE0056 Typical Connection Diagram
RING
TIP
RJ11
+5 Volts
Off hook
Ring Detect
1
2
3
4
9
8
7
6
5
Gnd
VCC
OH
RI
TXA1
T1
T2
RXA
TXA2
Rm
Z1
Z2
C1
MOV1
C2
C3
FB1
FB2
Modem Analog
Front End
XE0056
R1
R2
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)
Denotes Pin 1
A
B
C
F
E
J
H
D
G
XECOM (3) 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 Not Used
7 VCC VCC provides +5 Volt power source for the XE0056. VCC powers the /RI and OH control
lines.
8 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 XE0056.
To match the impedance of the DAA to the 600 ohm telephone line, a 280 ohm resistor is
required on T1 or T2.
9 GND
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.
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