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XE0002D
August 2005
Modular DAA with 2/4 Wire Convertor
Description The XE0002D is a compact DAA module designed for applications requiring voice, data or fax transfer. It complies with FCC Part 68 rules for direct connection to the public switched telephone network and also supports leased line applications. The XE0002D provides a complete telephone interface. It includes the 2/4 wire convertor to separate transmit and receive signals, ring detection, integral switch hook and telephone line transformer. All of this circuitry is integrated into a module requiring only 1.25 inches of board space. Features: * Small Size: just 1.25 inches by 1.0 inches by 0.32 inches high * FCC Part 68 Compliant * User selectable 2-4 wire convertor * Active Low Ring Detection * Integral Switch Hook * Supports V.32 Data Transfer * Supports both dial-up and leased line applications * Extended Operating Temperature Range (-40C to +85C) available
XE0002D Block Diagram
/OH
HookHook-Switch
XMIT RCVR XFMR T1 T2
J2 J1 2/42/4- Wire Conve rter
Tip
Telephone Line Transforme r Loop Curre nt Holding Circuit
Ring
/RI
Ring Detect
Jumpers J1 and J2 must be installed to connect the 2 to 4 wire convertor.
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XE0002D
XE0002D Mechanical Specifications
Inches Min Max 1.235 1.265 0.985 1.015 0.490 0.510 0.890 0.910 0.890 0.910 0.125 0.040 0.060 0.165 0.185 0.090 0.110 0.020 0.025 Millimeters Min Max 31.37 32.13 25.02 25.78 12.45 12.95 22.61 23.11 22.61 23.11 3.18 1.02 1.52 4.19 4.70 2.29 2.79 0.51 0.64
Dim A B C D E F G H J K
XE0002D Pin Configuration
VDD VCC /RI RCVR XMIT XFMR T1 OH Gnd T2 1 2 3 4 5 6 7 8 9 10 20 (Top View) 17 RING TIP
14 13 12 11
N/C N/C N/C N/C
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XE0002D
XE0002D Pin Descriptions
Pin
1 2 3 4 5 6
Name
VDD VCC /RI RCVR XMIT XFMR
Description
VDD supplies -5 Volt power to the XE0002D's 2 to 4 wire converter. VCC supplies +5 Volts power to the XE0002D Ring Indicate, output, active low, TTL. /RI indicates the XE0002D is receiving a ring signal. /RI remains low for the duration of each ring. RCVR acts as the analog output from the XE0002D's 2 to 4 wire converter. Signals pass from the telephone line to the host via RCVR XMIT provides the analog input to the XE0002D's 2 to 4 wire converter. Signals placed on XMIT are sent out onto the telephone line. XFMR is provided to connect the internal 2 to 4 wire converter to the telephone line transformer. A jumper is required from XFMR to T1 whenever the 2 to 4 wire circuit is required. T1 is one of two direct connections to the internal telephone line transformer. T1 must be connected to the XE0002D XFMR lead to use the internal 2 to 4 wire converter. If the 2 to 4 wire converter is not required, Signals for the telephone line can be passed across T1 and T2. Hookswitch relay control. A high on OH closes the internal relay and connects the equipment to the telephone line. Gnd provides the ground reference connection to the XE0002D. T2 is one of two direct connections to the internal telephone line transformer. T2 must be connected to Ground to use the internal 2 to 4 wire converter. If the 2 to 4 wire converter is not required, Signals for the telephone line can be passed across T1 and T2. No Connection
7
T1
8 9 10
OH Gnd T2
11-14 17 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 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 XE0002D accept this line battery voltage without regard to its polarity.
20
Tip
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XE0002D
XE0002D Electrical Specifications
Parameter
Power Supply Current
(VCC = 5V + 10%, Ta = 0 to 70C)
Conditions
VCC VDD
Min
Typ
10 4 0 0 340
Max Units
mA mA dB dB ohms 660 Ohms dB
Transmit Insertion loss Receive Insertion loss Line Matching Resistor (Rm) Line Impedance Transhybrid Loss
600 Ohm Impedance, 1000 Hz 600 Ohm Impedance, 1000 Hz for 600 ohm telephone line At 1000 Hz, Rm equal to 340 ohms without internal 2/4 wire convertor Attenuation between transmitter input and receiver output at 1KHz with 600 ohm line termination At XMIT, 1800 Hz At RCVR, 1800 Hz Min. AC voltage between Tip & Ring Type B ringer Ring Voltage present on Tip and Ring ON: (off-hook) OFF: (on-hook) 4.0 38 540 10
600 18
Transmit Input Impedance Receive Output Impedance Ring Detect Sensitivity Ring Indicate Output Hook Switch Control Voltage
8
10 10
12 100
Kohm ohms Vrms
0.2
0.5
Volts Volts
0.8 0.5 20 100
Volts mA mA
Hook Switch Control Current Telephone Line Loop Current
Off-Hook Off-Hook
XE0002D Absolute Maximum Ratings
Storage Temperature Operating Temperature Range Maximum Lead Temperature (soldering 2 seconds per wave) -25C to +85C 0C to +70C 260 C
O
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XE0002D
XE0002D Typical Connection Diagram with Internal 2/4 Wire Converter
+5 Volts -5 Volts
Modem Analog Front End
/Ring Receive Transmit J1 OHRLY
XE0002D
10 ohms, 1/2 W VDD VCC /RI RCVR XMIT XFMR T1 OH Gnd J2 T2 RING 10 ohms, 1/2 W 470 pFd 3000 Volts 470 pFd 3000 Volts TIP Teccor P3100SC FerriteBead FerriteBead
RJ11 4 3
XE0002D Typical Connection Diagram without Internal 2/4 Wire Converter
+5 Volts
XE0002D
VDD TIP
10 ohms, 1/2 W FerriteBead Teccor P3100SC FerriteBead RING 10 ohms, 1/2 W 470 pFd 3000 Volts 470 pFd 3000 Volts
TDK 73M1903
GPIO0
RJ11 4 3
VCC /RI RCVR XMIT
RXAN TXAN TXAP RXAP GPIO1
42K R1 R2 42K
XFMR T1 T2 Gnd /OH
Note: R1 and R2 each equal one half of the ideal line matching impedance, 170 ohms.
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XE0002D
XE0002D FCC Instructions
When developing a product to be connected to the telephone line, it is necessary to use a circuit described as a Data Access Arrangement (DAA) which is approved by the appropriate governmental agency. In the US, for example, this agency is the Federal Communications Commission (FCC), while in Canada it is the Department of Communications (DOC). 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 XE0002D has been designed to meet all FCC Part 68 requirements for hazardous voltage, surge protection and leakage current. If the system developed transmits data, 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 200Hz to 3990Hz -9 dBm 3990Hz to 4005Hz -27 dBm 4005Hz to 16kHz -16 dBm 8kHz to 94kHz -47 dBm 86kHz to 270kHz -46 dBm 270kHz to 6MHz -6 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 XE0002D 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 XE0002D 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 XE0002D. 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 XE0002D already complies with FCC Part 68 rules, this is a relatively simple process.
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XE0002D
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.
Copyright, Xecom (c) 2005 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:408-942-2200 Fax:408-942-1346 Email: info@xecom.com www.xecom.com
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XE0002D

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