XECOM XE014JS-ITR, XE014JS Datasheet
XECOM XE014JS
PLCC DAA for Shared-Line Applications
XE014JS
10-99
Figure 1: XE014JS BLOCK DIAGRAM
Line Trans-
former
Line Current
Holding Cir-
cuit
Hookswitch
Ring De-
tector
T1
T2
OH(+)
RI(+)
Tip
Ring
Handset
Interrupt
Circuit
/Hint
/CD
Connect
Detect
Monitor
Description
Xecom’s XE014JS is a complete DAA integrated into a
compact PLCC package. The XE014JS incorporates
features which permit equipment to share a host
telephone line. The PLCC package reduces the DAA
space requirements and permits automated, high-volume
assembly.
The XE014JS is targeted for remote monitoring
equipment which shares a host telephone line such as set
top boxes and automated utility meters. The XE014JS
includes a pair of circuits which prevent the equipment
from interfering with host calls. The Connect Detect
circuit monitors line activity and indicates when the host
telephone line is in use. By monitoring this signal the
equipment avoids interruption of a host call in progress.
The handset interrupt circuit monitors the host telephone
line for interruptions while the equipment is on-line. this
permits the equipment to drop the call in progress if the
host picks-up the telephone line.
Like all Xecom DAA's the XE014JS is a complete
telephone line interface. It includes the telephone line
transformer, line current holding circuit, hookswitch and
ring indicator. The XE014JS replaces the dozens of
components found in a discrete design with a complete,
tested solution.
Features
* Package: 68-Pin PLCC (only 18 pins used) 0.952
inches by 0.952 inches by 0.170 inches high
* Integrated Telephone Line Transformer
* Integrated Ring Detection with active high and
active low ouput signals
* Operates on a single Power Supply of +5 Volts;
* Solid-State Hookswitch Control with active high
and active low inputs;
* Integrated Connect Detection monitor;
* Integrated Handset Interrupt circuit;
* FCC Part 68 Compliant;
* Extended Temperature Range available;
OH(-)
RI(-)
DC2
DC1
XECOM (2) XE014JS
Figure 2: XE014JS Pin Configuration
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
RI(-)
RI(+)
OH(+)
T1
T2
N/C
OH(-)
VCC
Gnd
N/C
Ring
Tip
N/C
N/C
N/C
N/C
/Hint
/CD
XE014JS
(top)
Pin Descriptions
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 XE014JS
accepts this line battery voltage without regard to its polarity.
4-7 N/C No Connection
8 /Hint Handset Interrupt provides an active low output to indicate when another piece of equipment goes off-
hook on the shared telephone line. When the XE014JS detects a drop of at least one volt in the DC line
voltage, /Hint goes low for two to six seconds to notify the host equipment that the is required by other
equipment. The host equipment is responsibel for deactivating the OH line to return the XE014JS to the
on-hook state.
9 /CD Connect Detect is an active low output which indicates that the local telephone line is available for use.
/CD remains active as long as the DC line voltage remains above 36 volts.
10 GND Ground connection to the XE014JS. 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 Volt power source for the XE014JS. VCC powers the RI and OH control lines.
12 OH(-) Modem switch-hook control: OH(-), an active low input, for controls the switch hook in the XE014JS.
When the host activates pin 12, the switch-hook closes and the XE014JS seizes the local telephone line.
Pin 16 provides an active high switch-hook control. OH(-) should remain open when using OH(+).
The host can pulse OH(-) line to perform rotary dialing. The normal pulse rate is ten pulses per second.
Closing the switch-hook creates a series of pulses. Dial one pulse for the digit one to ten pulses for the
digit zero. The pulses on OH(-) must be asymmetrical, active for thirty-one milliseconds, inactive for
sixty-nine milliseconds. An inter-digit delay of at least one hundred milliseconds is required.
Pin Descriptions
PIN NAME DESCRIPTION
13 N/C No Connection
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 miniature line transformer embedded into the XE014JS. To match
the impedance of the DAA to the 600 ohm telephone line, a 340 ohm resistor must be connected in
series with 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 miniature line transformer embedded into the XE014JS. To match
the impedance of the DAA to the 600 ohm telephone line, a 340 ohm resistor must be connected in
series with T1 or T2.
16 OH(+) Switch-hook control to the modem. OH(+) provides an active high input for controlling the switch
hook. When pin 16 is active, the switch-hook closes and the XE014JS seizes the local telephone line.
OH(+) should remain open when using OH(-).
The host can pulse OH(+) line to perform rotary dialing. The normal pulse rate is ten pulses per second.
Closing the switch-hook creates these pulses. Dial one pulse for the digit one to ten pulses for the digit
zero. The pulses on OH(+) must be asymmetrical, active for thirty-one milliseconds, inactive for sixty-
nine milliseconds. An inter-digit delay of at least one hundred milliseconds is required.
17 RI(+) Ring Indicate output from the modem. RI(+) is an active high output. RI(+) provides a square wave
representation of the Ring signal present across Tip and Ring. This permits intelligent monitoring of
the incoming ring. The XE014JS recognizes ring voltages of thirty-eight to one hundred fifty volts
RMS in the frequency range of sixteen to sixty-eight Hertz. When using RI(+), a 20K pull-down
resistor is required on Pin 17 and Pin 18, RI(-), must be tied to ground.
18 RI(-) Ring Indicate output from the modem. RI(-) is an active low output. RI(-) provides a square wave
representation of the Ring signal present across Tip and Ring. This permits intelligent monitoring
of the incoming ring. The XE014JS recognizes ring voltages of thirty-eight to one hundred fifty
volts RMS in the frequency range of sixteen to sixty-eight Hertz. When using RI(-), a 20K pull-up
resistor is required on Pin 18 and Pin 17, RI(+), must be applied to VCC.
XECOM (3) XE014JS
XECOM (4) XE014JS
Electrical Specification (Vcc=+5v ±10%, Ta=0 to 70 deg C)
Power Supply Current Off-hook 10 mA
On-hook 1.0 mA
Transmit Insertion loss 600 Ohm Impedance, 1800 Hz 4.4 5.4 6 .4 dB
Receive Insertion loss 600 Ohm Impedance, 1800 Hz 4.4 5.4 6 .4 dB
Line Matching Impedance Input to T1 and T2 320 340 360 ohms
Line Impedance 340 ohm matching impedance resistor 540 600 660 ohms
Total Harmonic Distortion 600 Ohm Impedance, 100 to 4000 Hz -76 -80 dB
Ring Detect Sensitivity Min. AC voltage between Tip & 20 150 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 high) OFF: (on-hook) 2.0 3.0 Volts
Hook-Switch Control ON: (off-hook) 2.0 3.0 Volts
Voltage (active low) 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 No Connection from DC1 to DC2 20 100 mA
(current draw from line) DC1 shorted to DC2 10 60
DC On-Hook Impedance Hookswitch Open 10 MOhms
Connect Detect Threshold On-Hook 36 Volts DC
Handset Detect Threshold Off-Hook D1 Volts DC
Parameter Conditions Min Typ Max Units
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