PRELIMINARY
XE0092
April 2003
Surface-Mount DAA for Audio Data Transfer
Description
Features
The XE0092 provides a complete DAA (Data Access
* Low-profile, surface-mount package: 1.20” by 1.00”
Arrangement) in a compact, surface-mount package. It is
by 0.27”
an alternative to discrete DAA’s for a multitude of Audio
* Meets line interface requirements for reliable V.90
and Data applications. The XE0092 replaces 25 to 30
and V.92 communications;
discrete components with a single, assembled unit.
* Typical Total Harmonic Distortion of -80 dB ;
The XE0092 does not sacrifice performance for small size
* Part 68 Compliant;
and surface-mount convenience. The wide bandwidth,
* Integrated 2-to-4 wire convertor typically provides a
low distortion design supports analog data transfer to 56
36 dB Trans-hybrid Loss
KBPS.
* Supports detection of incoming Caller ID signals;
* Integrated Ring Detection,
Like all Xecom DAA's the XE0092 is a complete DAA. It
* Operates on a Single + 3.3 Volt Power Supply;
includes a 2-4 wire convertor, loop current holding circuit,
* Solid-State Hookswitch Control;
hookswitch and ring indicator. The XE0092 complies with
FCC Part 68 rules for direct connection to the telephone
line.
XE0092 BLOCK DIAGRAM
/OH
Hook-Switch
TX-
TX+
2-to-4
Loop
Wire
Current
Tip
RX-
Con-
Network
Holding
Ring
RX+
vertor
Isolation
Circuit
/CID
Line
/RI
Monitor
XECOM
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XE0092
XE0092 Mechanical Specifications
E
XE0092
F
H
A
D
H
G
E
B
C
I
J
J
K
DIM
INCHES
MM
DESCRIPTION
A
1.00
25.40
Product Length
B
1.20
30.48
Product Width
C
0.27
6.86
Product Height at tallest component
D
0.80
20.32
Pin Row length Pin 1 to Pin 9
E
0.10
2.54
Distance from Pin 1 or Pin 9 to Edge of the Product PCB
F
0.50
12.70
Distance from Pin 11 to Edge of the Product PCB
G
0.40
10.16
Distance from Pin 10 to Edge of the Product PCB
H
0.10
2.54
Distance between adjacent Pins
I
0.05
1.27
Total Height of the interface Pin
J
0.05
1.27
Distance the interface Pin extends beyond the Product PCB
K
1.30
33.02
Total Distance across Product including interface Pins
NOTE: All interface Pins are 0.25 inch square, gold plated
XECOM
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XE0092
XE0092 Pin Configuration
VCC
1
TX-
2
TX+
3
/OH
4
/RI
5
11
TIP
/CID
6
10
RING
RX-
7
RX+
8
GND
9
XE0092 Pin Descriptions
Pin Name
Description
1
VCC
+3.3 or 5 Volt power source for the XE0092. VCC powers the RI and OH control lines.
2
TX-
TX- is the negative half of the differential transmit data input to the XE0092 from the host system. If the host
system uses a single ended transmit data output, that output should be connected to TX- and TX+ should be
grounded.
3
TX+
TX+ is the positive half of the differential transmit data input to the XE0092 from the host system. If the host
system uses a single ended transmit data output, that output should be connected to TX- and TX+ should be
grounded.
4
/OH
Switch-hook control to the modem. /OH is an active low input. Activating OH closes the switch-hook causing
the XE0092 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 hookswitch. (one pulse for the digit one to ten pulses for
the digit zero) The pulses must be asymmetrical so that the hookswitch is closed for thirty-one milliseconds and
open for sixty-nine milliseconds. An inter-digit delay of at least one hundred milliseconds is required.
5
/RI
Ring Indicate output from the modem. /RI is active low. RI goes low for the duration of each incoming ring,
returning high between rings. The XE0092 recognizes ring voltages of twenty-eight to one hundred fifty volts
RMS in the frequency range of sixteen to sixty-eight Hertz.
6
/CID
/CID is an active low output from the XE0092. It indicates that the signal presented on the modules received
data output is Caller ID information. Caller ID signals are passed while the XE0092 is on-hook. The telephone
network normally sends Caller ID information on incoming calls between the first and second ring.
7
RX-
RX- is the negative half of the differential received data output from the XE0092 to the host system. If the host
system uses a single ended received data input, that input should be connected to RX+ and RX- should remain
open.
XECOM
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XE0092
XE0092 Pin Descriptions
Pin Name
Description
8
RX+
RX+ is the positive half of the differential received data output from the to the host system. If the host system
uses a single ended received data input, that input should be connected to RX+ and RX- should remain open.
9
GND
Ground connection to the XE0092. This signal provides the reference for the OH output and RI input. This
pin should be connected to the systems digital ground.
10
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
11
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 XE0092 accept this line
battery voltage without regard to its polarity.
Typical Connections Diagram for North America and Japan
HOST System
with
Differential
XE0092
Data Signals
C1
1
VCC
TXA1
2
TX-
TXA2
3
TX+
OHRLY
C2
4
/OH
FB1
RJ11
/RING
5
/RI
TIP 11
F1
/INT
C3
6
/CID
RING 10
RX-
7
RX-
RX+
MOV1
8
RX
C4
9
GND
FB2
F2
C5
C6
Component Description
C1-C4
0.1 uFd; these Capacitors insure only the AC signal passes from the host to the XE0092.
C5, C6
470 pFd, minimum 1500 Volts; These capacitors 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 which may be required for EMI filtering to prevent unintended
radiation when the telephone cable is attached to your system. Xecom recommends the TDK
ACB2012L-120 which provides more than 100 ohms impedance at frequencies above 100 MHz.
MOV1
MOV1 protects against damage from lightening strikes on the telephone lines. Xecom recommends
the Teccor P3100BA Sidactor to provide this protection.
F1, F2
F1 and F2 prevent damage to the system when a power line crosses with the telephone line.
Xecom recommends the Raychem TR600-150 for this function. The TR600-150 is a PTC devices
which automatically resets after use.
XECOM
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XE0092
XE0092 Soldering Instructions
Because of its Hybrid construction, the XE0092 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:
Xecom’s XE0092 DAA modules should be exposed to no more than one reflow cycle.
XECOM
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XE0092
XE0092 Applications Notes
Dialing:
Signal Levels:
The public switched telephone network permits tone and
FCC Part 68 Rules set the allowable signal level in the US for all
rotary (pulse) dialing. The XE0092 supports both types.
signals placed on the telephone line other than live voice. Other
Tone dialing requires an external signal source to generate the
countries have similar regulations. Signal levels are measured in
dialing tones. Rotary dialing is accomplished by pulsing the
dBm. Zero dBm is 1 milliwatt through a 600 ohm load.
OH line on the XE0092.
Pulse Dialing: The XE0092 generates dialing pulses through
Total Harmonic Distortion:
momentary closures of the switch-hook. (In some countries
Total harmonic distortion is the most common measure of the
pulsing of the MUTE signal is required to meet local pulse
signal path quality provided by the DAA. The primary sources
dialing rules.) Each digit is represented as a series of pulses,
of this distortion are the telephone line transformer and the line
one pulse for a one to ten pulses for a zero. The pulse rate
current holding circuit, although board layout and other factors
varies from ten pulses per second in North America to 20
can introduce distortion.
pulses per second in Europe. The dialing pulses are asym-
metrical. To achieve the correct duty cycle consult with the
Total harmonic distortion varies with frequency. The voice
local country regulations. An inter-digit delay of at least one
band provided by the telephone line is limited to under 4000
hundred milliseconds separates the digits.
Hz. High speed modems such as 33.6 KBPS and 56 KBPS
require virtually all of this bandwidth for signal transmission.
Tone Dialing: To permit tone dialing the XE0092 seizes the
Even if the total harmonic distortion of a device is very good in
line, OH active. For each digit a unique DTMF, Dual Tone
the center portion of the spectrum, signal quality is compro-
Multiple Frequency, tone pair is applied to TX+ and TX-.
mised if distortion greatly increases at the outer limits of the
The higher frequency tone is always larger than the lower
voice band. The figure below shows the typical total harmonic
frequency one.
Transmit the tones for a minimum of 70
distortion of the XE0092 across the entire voice band.
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 Tone
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
XECOM
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XE0092
Electrical Specifications
Parameter
Conditions
Min
Typ
Max
Units
Power Supply Voltage
3.0
5.50
Volts
Power Supply Current
Off-hook
10
mA
On-hook
0.5
mA
Transmit Insertion loss
600 Ohm Impedance, 1800 Hz
-0.4
0
0.4
dB
Receive Insertion loss
600 Ohm Impedance, 1800 Hz
-0.4
6.0
0.4
dB
Line Impedance
Off-hook
600
ohms
Total Harmonic Distortion
600 Ohm Impedance, 200 to 4000 Hz
-80
dB
Ring Detect Sensitivity
Min. AC voltage between Tip &
28
150
Vrms
Ring Type B ringer
Ring Frequencies Detected
15
68
Hz
RI Output Voltage
Ring present, Active low
0.4
Volts
No Ring signal , Active High
VCC- .4
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: (on-hook)
0.8
2.0
Volts
Hook-Switch Control
Low: (off-hook)
-120
microamps
Current
High: (on-hook)
-120
microamps
Loop Current
Off-Hook current draw from
10
100
mA
Telephone Line
DC On-Hook Impedance
Hookswitch Open
10
MOhms
XE0092 ABSOLUTE MAXIMUM RATINGS
Storage Temperature
-40 O C to +125 O C
Operating Temperature Range *
0 O C to +85 O C
* The XE0092 can be ordered with an Operating Temperature of -40 O C to +85 O C at extra cost.
Order Model Number XE0092-ITR
XECOM
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XE0092
XE0092 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 XE0092 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 XE0092 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 XE0092 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 XE0092. 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
XE0092 already complies with FCC Part 68 rules, this is a relatively simple process.
XECOM
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XE0092
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 applica-
tions, 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 pro-
vided 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.
Copyright, Xecom © 2003
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 trade-
marks and/or registered trademarks of their respective companies.
Xecom Incorporated
374 Turquoise Street, Milpitas, CA95035
Ph:408-942-2200 Fax:408-942-1346
Email: info@xecom.com
Web Site: http://www.xecom.com
XECOM
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XE0092