Simplifying System Integration
TM
73M2901CE
Demo Board User Manual
March 17, 2010
Rev. 1.5
UM_2901CE_026
73M2901CE Demo Board User Manual
UM_2901CE_026
© 2010 Teridian Semiconductor Corporation. All rights reserved.
Teridian Semiconductor Corporation is a registered trademark of Teridian Semiconductor Corporation.
Simplifying System Integration is a trademark of Teridian Semiconductor Corporation.
All other trademarks are the property of their respective owners.
Teridian Semiconductor Corporation makes no warranty for the use of its products, other than expressly
contained in the Company’s warranty detailed in the Teridian Semiconductor Corporation standard Terms
and Conditions. The company assumes no responsibility for any errors which may appear in this
document, reserves the right to change devices or specifications detailed herein at any time without
notice and does not make any commitment to update the information contained herein. Accordingly, the
reader is cautioned to verify that this document is current by comparing it to the latest version on
http://www.teridian.com or by checking with your sales representative.
Teridian Semiconductor Corp., 6440 Oak Canyon, Suite 100, Irvine, CA 92618
TEL (714) 508-8800, FAX (714) 508-8877, http://www.teridian.com
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73M2901CE Demo Board User Manual
Table of Contents
1
Introduction ................................................................................................................................... 5
1.1 Getting Started......................................................................................................................... 5
1.2 Recommended Operating Conditions and Absolute Maximum Ratings ..................................... 6
1.3 Basic Connections ................................................................................................................... 6
Design Considerations .................................................................................................................. 7
73M2901CE EVM-600 Demo Board ............................................................................................... 8
3.1 Using the 73M2901CE EVM-600 Demo Board ......................................................................... 8
3.2 73M2901CE EVM-600 Hardware Design ................................................................................. 9
3.2.1
73M 2901CE EVM-600 Schematic Diagrams ............................................................. 9
3.2.2
73M2901CE EVM-600 Demo Board Pin Description ................................................ 12
3.2.3
73M2901CE-EVM-600 Demo Board Bill of Materials ................................................ 14
3.2.4
73M2901CE-EVM-600 Demo Board PCB Layout ..................................................... 15
2
3
73M2901CE EVM-WW Demo Board............................................................................................. 17
4.1 Using the 73M2901CE0-EVM-WW Demo Board .................................................................... 17
4.2 73M2901CE EVM-WW Hardware Design ............................................................................... 19
4.2.1
73M 2901CE EVM-WW Schematic Diagrams .......................................................... 19
4.2.2
73M2901CE EVM-WW Demo Board Pin Description................................................ 22
4.2.3
73M2901CE EVM-WW Demo Board Bill of Materials ............................................... 24
4.2.4
Recommended Components Used in the Demo Boards ........................................... 25
4.2.5
73M2901CE EVM-WW Demo Board PCB Layout .................................................... 28
5
DC Loop Circuit Schematic ......................................................................................................... 29
6
Related Documentation ............................................................................................................... 29
7
Contact Information..................................................................................................................... 29
Revision History .................................................................................................................................. 30
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73M2901CE Demo Board User Manual
UM_2901CE_026
Figures
Figure 1: T73M2901CE Demo Board Basic Connections ......................................................................... 6
Figure 2: 73M2901CE EVM-600 Demo Board Schematic....................................................................... 10
Figure 3: 73M2901CE EVM-600 Motherboard Schematic ...................................................................... 11
Figure 4: 73M2901CE EVM-600 Demo Board Pin Connections ............................................................. 12
Figure 5: 73M2901CE EVM-600 Demo Board: Bottom Layer ................................................................. 15
Figure 6: 73M2901CE EVM-600 Demo Board: Top Layer ...................................................................... 15
Figure 7: 73M2901CE EVM-600 Demo Board: Top Silk Screen ............................................................. 16
Figure 8: 73M2901CE Worldwide Demo Board: Daughter Board Schematic .......................................... 20
Figure 9: 73M2901CE Worldwide Demo Board: Motherboard Schematic ............................................... 21
Figure 10: 73M2901CE Worldwide Daughter Board Pin Connections ..................................................... 22
Figure 11: 73M2901CE Worldwide Demo Board: Bottom ....................................................................... 28
Figure 12: 73M2901CE Worldwide Demo Board: Top Layer and Silk Screen ......................................... 28
Figure 13: Simple DC Loop Simulator .................................................................................................... 29
Tables
Table 1: Recommended Operating Conditions ......................................................................................... 6
Table 2: Absolute Maximum Ratings ........................................................................................................ 6
Table 3: Termination Impedance Network Values .................................................................................... 8
Table 4: 73M2901CE EVM-600 Demo Board Description: Digital Interface ............................................ 12
Table 5: 73M2901CE EVM-600 Demo Board: Telephone Network Interface .......................................... 12
Table 6: 73M2901CE EVM-600 Demo Board: DB-25 RS-232 Level Serial Interface ............................... 13
Table 7: 73M2901CE EVM-600 Demo Board Bill of Materials ................................................................ 14
Table 8: S-register Settings for Worldwide Modem Design ..................................................................... 17
Table 9: Termination Impedance Network Values .................................................................................. 17
Table 10: Worldwide Country AC Impedance Requirements .................................................................. 18
Table 11: 73M2901CE Worldwide Demo Board: Digital Interface ........................................................... 22
Table 12: 73M2901CE Worldwide Demo Board: Telephone Network Interface ....................................... 23
Table 13: 73M2901CE Worldwide Demo Board: DB-25 RS-232 Level Serial Interface ........................... 23
Table 14: 73M2901CE Worldwide Demo Board Bill of Materials ............................................................. 24
Table 15: Transformers and Suppliers Tested and Used with the 73M2901CE....................................... 25
Table 16: EMI Inductors for the Tip/Ring Signal Path ............................................................................. 25
Table 17: Recommended PTC Fuses for CPE Applications ................................................................... 26
Table 18: Recommended TVS Over Voltage Protectors ......................................................................... 27
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73M2901CE Demo Board User Manual
1 Introduction
The Teridian Semiconductor Corporation 73M2901CE Demo Board is a platform for evaluating the
73M2901CE single-chip modem ICs. It incorporates the 73M2901CE integrated circuit, and it has been
designed to operate with a PC using the serial COM1 or COM2 RS-232 level ports and standard
communications software packages such as HyperTerminal.
This document describes the two available demo board configurations, the 73M2901CE-EVM-600 and
the 73M2901CE-EVM-WW.
The 73M2901CE EVM-600 is a board fitted with 600
Ω
resistive termination and is suitable for use in USA
and Japan. This board has been designed to comply with U.S. Part 68, USA, and AS/ACIF S002:2001.
The 73M2901CE EVM-WW has selectable terminations, which makes it suitable for use in many different
countries worldwide. The board has been designed to comply with FCC Part 68, ETSI TS 203, JATE and
AS/ACIF S002:2001.
1.1
Getting Started
Figure 1 shows the basic connections of the Demo Board.
•
Use the supplied motherboard and 5 V power supply.
•
The motherboard includes a 3.3 V regulator to power the 73M2901CE Demo Board.
•
The motherboard also includes RS-232 level shifters and DCE connector to connect the demo board
to a PC or other terminal device.
•
Use a standard PC terminal emulation program to communicate with the 73M2901CE Demo Board.
See the
73M2901CE AT Command User Guide
for a complete list of commands.
•
Type “AT” on the terminal at any speed from 1200 bps to 9.6 Kbps to verify communications with the
modem are working correctly. The 73M2901CE modem will return “OK” if communication is properly
established.
•
Connect the RJ-11 connector to a telephone network emulator or private branch exchange (BPX).
The demo board, although meeting all the required telecom standards, is not a certified device.
Therefore the 73M2901CE Demo Board should not be connected to the outside telephone network.
It is not possible to connect two 73M2901CE demo boards back-to-back to test their operation. A DC
loop current is needed to activate the network-side circuitry. A simple current-mirror current-source circuit
can be used to provide the required DC loop current. A simple circuit is shown in Figure 13. This circuit
supplies two independent sources, one for each modem. The loop current provided is approximately 20
mA to each modem. This circuit does not provide network impairments, call progress signals, or
attenuation, which are also typically used for modem testing.
Rev. 1.5
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