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73M2901CE Demo Board User Manual

1. Ring E M LIU E analog digital power ground separate up to J1 connector p 3 a age 2901CE_QFN TQFP32 Keep Vref and Vbg traces away from digital 1B L traces especially clocks Keep traces short and 58226 55 2 connect Vref and Vbg caps to analog ground CTR 21 C20 150nF vecs 3D 57 pp wa E All resistors 0603 footprint except R25 which is 0614 58 DD EXA az 1206 d 88 Las VREF Note R24 750 08 611019 VRE Lua par Mount J1 and J2 on the BACK of the board 1 RELAYB TAN EMIT4033 is required for Austalia only U2C 74LVC4066D BB el s 41 VCC3 01140 the non encapsulated MIT4033 be 2 888 used for designs not requiring Austalian a AUT ___ operation 88355893 lea ae C25 120nF Oo x al 21 5 11 0592 MHz gt tI R26 820 D3 4 11 10 4 BZT52C2V4 7 F m Y1
2. Quant Reference Part PCB Footprint DigiKey Manufacturer Manufacturer 1 BR1 HD04 miniDIP HD04DITR ND HD04 Diodes Inc 2 C1 C9 10 0805 PCC2182CT ND Panasonic 1 C2 27pF 0805 PCC270ACVCT ND Panasonic 1 C3 33pF 0805 PCC330ACVCT ND Panasonic 1 C4 47nF 0805 PCC1808CT ND Panasonic 3 C5 C12 C13 3 3 uF 0805 PCC1841CT ND 6 C6 C7 C8 0 1 uF 0805 PCC1762CT ND Panasonic C10 C11 C14 1 C19 0 22uF 1812 CR1812X7R224ZWT UTC 1 E1 Bidirectional SMB TISP4350T3BJR Bourns Thyristor 03100 Diodes Inc 1 F1 MF R015 600 200mil T H Bourns Raychem 1 J1 HEADER 10 100 mil 10 position 1 J2 HEADER 4 100 mil 4 position 4 L1 L2 L3 L4 NLC322522T 4R7M 1206 TDK 1 R1 10K 0805 311 10KHCT ND Phicomp 1 R2 20K 311 20KHCT ND Phicomp 1 R3 5 1K 0805 311 5 Phicomp 1 R4 470 0805 Phicomp 1 R6 21K 0805 311 21KHCT ND Phicomp 1 R9 63K 0805 311 63KHCT ND Phicomp 1 R16 100 0805 311 100HCT ND Phicomp 1 T1 4115 4115 Sumida 1 U1 2901CE_MLF TQFP32 0805 Teridian Semi 1 U2 TLP627 0805 TLP627TP1CT ND Toshiba 1 Y1 11 0592 MHz 200 mil T H CTX409 ND 14 Rev 1 5 2901 026 73 2901 Demo Board User Manual 3 2 4 73M2901CE EVM 600 Demo Board PCB Layout BOTTOM LAYER Figure 5 73M2901CE EVM 600 Demo Board Bottom Layer TOP LAYER Figure 6 73M2901CE EVM 600 Demo Board Top Layer Rev 1 5 15 73 2901 Demo Board User Manual 2901 026 75
3. 5 Tal Getting Started Aa ee tete tee i e EHE HORE DECR DAD ETT q gus 5 1 2 Recommended Operating Conditions and Absolute Maximum Ratings 6 1 3 Basic Connections ee eee 6 2 5 ita 7 3 73M2901CE 600 Demo Board U U u u 8 3 1 Using the 73 2901 600 Demo sse 8 3 2 73M2901CE 600 Hardware Design 9 3 2 1 73M 2901 EVM 600 Schematic Diagrams a 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 15 4 7T3M2901CE EVM WW Demo Board U 17 4 1 Using the 73M2901CE0 EVM WW Demo Board 17 4 2 73M2901CE EVM WW Hardware 19 4 2 1 73M 2901CE EVM WW Schematic 19 4 2 2 73M2901CE EVM WW Demo Board Pin Description 22 4 2 3 73M2901CE EVM WW De
4. DIAN SEMICONDUCTOR CORP Simplifying System Integration 73M2901CE Demo Board User Manual March 17 2010 Rev 1 5 UM_2901CE 026 73 2901 Demo Board User Manual 2901 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 Awww 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 2 Rev 1 5 2901 026 73 2901 Demo Board User Manual Table of Contents 1 7 m
5. 18 Table 11 73M2901CE Worldwide Demo Board Digital 22 Table 12 73M2901CE Worldwide Demo Board Telephone Network 23 Table 13 73 2901 Worldwide Demo Board DB 25 RS 232 Level Serial Interface 23 Table 14 73M2901CE Worldwide Demo Board Bill of 24 Table 15 Transformers and Suppliers Tested and Used with the 73 2901 25 Table 16 EMI Inductors for the Tip Ring Signal Path I rar 25 Table 17 Recommended PTC Fuses for CPE Applications 222 26 Table 18 Recommended TVS Over Voltage Protectors 27 4 Rev 1 5 2901 026 73 2901 Demo Board User Manual 1 Introduction The Teridian Semiconductor Corporation 73 2901 Demo Board is a platform for evaluating the 73M2901CE single chip modem ICs It incorporates the 73 2901 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 73M2901CE EVM 600 is a board fitted with 600 resistive termination and is suitable for use in USA and J
6. 2701 USA DEMO BOARD 42 Ci Ri R Gemiconductor Corp R Figure 7 73M2901CE EVM 600 Demo Board Top Silk Screen 16 Rev 1 5 2901 026 73 2901 Demo Board User Manual 4 73M2901CE EVN WW Demo Board It is possible to design a modem that can be used in virtually any country without the need to fit different hardware for different countries standards One of the more significant differences between countries is the line impedance match that is required This termination can be a concern since poorly matched impedances will affect the network by increasing the reflections and crosstalk Therefore there are different terminations required in different countries to match the equipment impedance to the local network s characteristics Worldwide countries use three basic network models see Table 8 and Table 9 In the U S and North America a 600 Q resistive termination is used Many other counties also use this termination In most of Europe the primary termination is a complex AC impedance called ETSI TS 203 This is also used in other countries outside of Europe The third network model is for Australia and New Zealand There are other concerns such as transmit levels ring frequencies and levels call progress tone frequencies and cadence and network protection The first four of these are all programmable through the 73M2901CE S registers The last can be taken care of by designing for the
7. DB 25 RS 232 Level Serial Interface Name DB 25pin Description TXD 2 Transmit Digital Inverted Input Pin used as the digital data input for commands and data transmission Receive Digital Inverted Output Pin used as the digital data output for RXD 3 E echoing commands and for data reception RTS 4 Request Send High true input Used for RTS CTS flow control and V 23 transmission control Controlled by the Kn command Clear To Send High true output Used for RTS CTS flow control and to CTS 5 indicate carrier is being sent in V 23 mode Controlled by the command DSR 6 Data Set Ready High true output Indicates the modem is present and ready for use DCD 8 Data Carrier Detect High true output Indicates a carrier is being received Controlled by the Cn command Data Terminal Ready High true Input Pin used by the terminal to DTR 20 control certain actions of the modem such as return to command mode terminate call V 23 turnaround reset and power down RI 22 Ring High true output Indicates valid ring signal is being received Goes low for the duration the ring result code is being sent on RXD Rev 1 5 13 73 2901 Demo Board User Manual 2901 026 3 2 3 73 2901 600 Demo Board Bill of Materials Table 7 73M2901CE EVM 600 Demo Board Bill of Materials
8. Indicates the modem is present and ready for use DCD J1 5 Data Carrier Detect Low true output Indicates a carrier is being received Controlled by the Cn command RI J1 6 Ring Low true output Indicates a valid ring signal is being received Goes low for the duration the ring result code is being sent on RXD 01 7 Transmit Digital Input Pin used as the digital data input for commands and data transmission Data Terminal Ready Low true Input Pin used by the terminal to control DTR J1 8 certain actions of the modem such as return to command mode terminate call V 23 turnaround reset and power down RXD J1 9 Receive Digital Output Pin used as the digital data output for echoing commands and for data reception GND J1 10 Demo board ground 22 Rev 1 5 2901 026 73 2901 Demo Board User Manual Table 12 73M2901CE Worldwide Demo Board Telephone Network Interface Name Pin Description TIP 2 42 1 Connection 42 2 Polarity independent connection to the telephone network RING 42 3 Polarity independent connection to the telephone network RING2 42 4 No Connection Table 13 73M2901CE Worldwide Demo Board DB 25 RS 232 Level Serial Interface Name DB 25pin Description Transmit Digital Inverted Input Pin used as the digital data input for TXD 2 mig commands and data transmission RXD 3 Receive Digital Inverted O
9. most stringent specifications Keep in mind that the overall cost of components will tend to be higher since components with higher ratings will cost more If Australia and New Zealand are on your list of target countries then design your protection for them Australia and New Zealand have higher isolation voltage requirements than other countries 3750VDC and require that the transformer be encapsulated Any other devices that cross the isolation barrier such as opto couplers must also meet this requirement They also have somewhat larger creepage and clearance requirements to match their isolation requirements The network input protection is now standard so finding components that that meet worldwide requirements are not too difficult Input current limiting and over voltage protection are both universally required or advised It is possible to pass PTT testing in some cases without current limiting but you put the integrity and survivability of your product at jeopardy by not using it Self resetting fuses are now available that not only protect the product but eliminate the need to replace parts if they are tripped 41 Using the 73M2901CE0 EVM WW Demo Board The schematic in Figure 8 shows how to change the termination using the USR pins of the 73M2901CE to control the AC termination network The user pins control the analog switches that determine the termination impedance The user pins may have some other defined purposes if certai
10. 0 dB gain boost during Caller ID reception compensates for this but if there is excessive noise it will also be amplified Keeping the analog and digital grounds separate helps control the amount of noise that gets to the receiver input Dramatic improvements in low level performance can be gained by proper layout Keep the VCC trace as short as possible Make the power trace a minimum of 0 5 mm thick The analog and digital power and ground should be kept separate for best low receive level performance Route the power to the digital pins and bypass capacitors on one net and the analog power and VBG bypass pins on another net with inductors separating the two If power planes are used separate the power and ground planes so there are separate analog and digital planes for the 73M2901CE Keep 0 1 uF and 3 3 uF bypass capacitors close to VPD power pins of the device and take other end to the digital ground Keep 0 1 uF and 10 uF bypass capacitors close to VPA power pin of the device and directly connect the other end to analog ground Keep all analog signaling away from any high speed digital circuitry and traces that may be on the board Observe the separation of the network and modem side circuitry Maintain at least 1 4 inch 6 separation between the two Do not run power planes under the network side circuitry and maintain the same spacing for the planes from the network Use only UL CSA or TUV approved components that cross the isol
11. 200 120nF 2200 8 Rev 1 5 2901 026 73 2901 Demo Board User Manual 3 2 73 2901 EVM 600 Hardware Design This section includes schematic drawings PCB layouts and bill of materials for the 73 2901 6000 Demo Board 3 2 1 73M 2901CE EVM 600 Schematic Diagrams Figure 2 and Figure 3 provide the schematics for the 73M2901CE EVM 600 Demo Board and Motherboard Rev 1 5 73 2901 Demo Board User Manual 2901 026 ISOLATION BARRIER Figure 2 73M2901CE EVM 600 Demo Board Schematic 10 Rev 1 4 2901 026 73 2901 Demo Board User Manual R9 VCC RS 232 DB25 NC A 5VDC IN J2 POWER CONNECTOR TP1 o m 10 5 AX3237E RING2 9 RXDB 9 8 DTRB 7 55 RIB ES 4 3 2 RTSB 1 J11 VCC CON 10 C5 0 1uF 0 1uF C2 0 1uF x Figure 3 73M2901CE 600 Motherboard Schematic Rev 1 4 11 73 2901 Demo Board User Manual UM 2901 026 75 2901 USA DEMD BOARD Figure 4 73M2901CE EVM 600 Demo Board Pin Connections 3 2 2 73M2901CE EVM 600 Demo Board Pin Description Table 4 73M2901CE EVM 600 Demo Board Description Digital Interface Name Description 41 1 3 3V power source for the demo board RTS 01 2 Request Send Low true input Used for RTS CTS flow control and
12. 250V No tur 10K For all 8102 3 8104 1 595 128 6110 64 4 600 Ohm termination 101 1 5101 2 5103 1 m Hees 21 termination 101 1 101 2 103 Australian termination 101 1 101 2 103 1 vCC3_3D Note Atermination MUST be programmed or no termination will be activated Figure 8 73 2901 Worldwide Demo Board Daughter Board Schematic 20 Rev 1 5 0 2901CE 026 73M2901CE Demo Board User Manual 7 u2 voc 2 ABD vec veg 9 C9 C10 3 C6 EN RAPC712 10uF 10V c5 RIOT 0 1uF Ui 0 1uF J 0 1uF 0 1uF d 10u 10V 26 28 ct c2 0 1 O tuF u 13 ARA C2 1 14 ES T 2 15 NG SATIN TIOUT 2 3 16 PX operation R10 is a T2IN T20UT d 17 PX NC and R9 is 0 Ohm vge 22 T3IN T3OUT 7 5 18 EX 17 T4OUT 12 6 19 PX T5OUT 20 16 8 21 PX R10UTB 8 9 22 201181007 RIIN
13. 27 10 23 X 18 R2OUT R2IN 7 24 PX 13 R3OUT 12 25 PX ENB 13 14 sone DSUB 25 vec MBAUD 9 2 HEADER 10 Female L vec GND le MAX3237 IP b TP9 Di wg A RI 4 2 2 10 02 4 y 6 DSR 4 33 DSR 11 D3 DCD 7 TP4 RING DCD TP12 04 CTS t ji 16 RING2 cTs lb D5 1 4 ABE A TO 1 22347 4 d 33 TP6 3 o 2 DD b TP13 4 1 5 06 5 1 6 2 4 4 L8 x gt 83 GND HEADER 4 Female RXD TP14 D7 RJ11 modular jack 6 pin 4 7 RTS 4 33 TPB GND RTS 08 Z 4A DIR 4 33 DTR Figure 9 73M2901CE Worldwide Demo Board Motherboard Schematic Rev 1 5 21 73 2901 Demo Board User Manual 2901 026 eridian Semiconductor Corp 2901CE Design Figure 10 73 2901 Worldwide Daughter Board Pin Connections 4 2 2 73 2901 EVM WW Demo Board Pin Description Table 11 73M2901CE Worldwide Demo Board Digital Interface Name Pin Description 41 1 3 3 V power source for the demo board RTS J1 2 Request To Send Low true input Used for RTS CTS flow control and V 23 transmission control Controlled by the Kn command CTS J1 3 Clear To Send Low true output Used for RTS CTS flow control and to indicate carrier is being sent in V 23 mode Controlled by the Kn command DSR 01 4 Data Set Ready Low true output
14. 27pH 33pH U2B 74LVC4066D 4 4 2 05600 Cx VCC3 3 O VCC3 3D ne T VCC3 3D Di ol Q2 B 4 R17 E RS1G Q1 MMBTA06 100 la MMBTA06 ul 27 420 Sumida C21 1 4 4 R28 4 1 2 4 EMIT4033L 3 3uF 25V 47K 13 al 56 NLV32T 4R7J PF 2901CE_QFN TQFP32 U2A 74LVC4066D C Ha Q3 p 58200252 we opa 25 iz LE gt gt 20 gt w MMSZ5248BT 18 62K 21022 o9 2K NC 5 1K x VCC3 3 25 16 18V 1 4W 3 3uF 25V 10 RXDB 26 VNA 315 1 al 9 DTRB pa mo PA 14 VBG R13 C 8 TXDB BXCLK 13 21K i i 1 1 L1 7 RIB AUST 29 01 VREF 12 TXAP C24 x NLV32T 4R7J PF 6 DCDB En USR20 TXAP 711 DAN 0 002uF NC i ANC 5 DSRB RELAYB g RING TXAN 10 71 cis mu 4 CTSB 32 BELAY ro RESE 3 3uF VCC3 3D 250V c28 3 RTSB 220pF 3kV i 284 5599 _ VCC3 3D 1 Sldldlola 33 x Sx 1 zi o tuF O tuE 4C9 _ cio VCC3 3A 901 600 9 10 0 1uF Y R8 PTC fuse lo 05600 1 04 30K 5 1 14 CTR 21 TLP627 842 1 TISP4350T3BJR H NLV32T 4R7J PF 7 R16 9 Bourns 100 ad 8 Thy ristor a J2 S BR1 12 3D NLV32T 4R7J PF x 5 HOOK E I a rw 2 al C18 c29 e 0 22uF R9 C19 _ 220pF RJ A1 4 x 250 L 4 T he programmable termination 30K 0 22uF cs C6 R1 o use the programmable te atio RING ClDdetection
15. 4 HD04DICT ND HD04 T Diodes Inc 2 C1 C9 10uF 587 1295 1 ND EMK212BJ106KG T Taiyo 1 C2 27pF PCC270ACVCT ND ECJ 1VC1H270J Panasonic 1 C3 PCC330ACVCT ND ECJ 1VC1H330J Panasonic 0 R2 C4 NC 4 C5 C12 C13 C24 3 3uF Cer PCC2288CT ND ECJ 2FB1A335K Panasonic 2 C21 C22 3 3uF 25V 399 3140 1 ND C1206C335K3PACTU Kemet 6 C6 C7 C8 C10 C11 C14 0 1uF 445 1314 1 ND C1608X7R1H104K TDK 1 C15 220pf 250 min 445 2338 1 ND C3216COG2J221J TDK 2 C18 C19 0 22uF 200V 490 3544 1 ND GRM43DR72E224KW01L Murata 1 20 0 152 150nF PCC1748CT ND ECJ 1VB1A154K Panasonic 1 C25 0 12uF 120nF PCC1906CT ND ECJ 1VB1A124K Panasonic 1 C26 0 082uF 82nF PCC2280CT ND ECJ 1VB1E823K Panasonic 1 C27 0 047 PCC1758CT ND ECJ 1VB1C473K Panasonic 2 C28 C29 220pF 3kV 445 2380 1 ND C4532COG3F221K TDK 1 D1 Rectifier 1A 400V RS1G FDICT ND RS1G 13 F Diodes Inc 2 D2 18V Zener Diode MMSZ5248BT1GOSCT MMSZ5248BT1G ON ND 1 D3 2 4V Zener Diode BZT52C2V4 FDICT ND BZT52C2V4 7 F Diodes Inc 1 1 Thyristor 270 250 P3100SBLRPCT ND P3100SBLRP Teccor Elect TISP4350T3BJR Bourns 1 F1 PPTC Fuse 150mA TRF600 150 ND TRF600 150 Rachem 600V MF R0150 600 Bourns 1 J1 HEADER 10 S1011E 36 ND PBC36SAAN Sullins 1 J2 HEADER 3 S1011E 36 ND PBC36SAAN Sullins 4 L1 L2 L3 L4 NLV32T 4R7J PF 445 1521 1 ND NLV32T 4R 7J PF TDK 2 Q1 Q2 6 MMBTA06LT1GOSCT MMBTAO6LT1G ON ND 1 Q3 BCP 56 BCP56T1GOSCT ND BCP56T1G ON 1 R1 10K P10 0KHCT ND ERJ 3EKF1002V Panasonic 2 R8 R9 30K P30KGCT
16. L60950 ITU T 20 21 45 Littlefuse SIDACtor P3100EB 275V 100A 10 560uS 968 01160950 ITU T 20 21 45 Tyco SiBar TVB275NSC 275V 100A 10 56045 968 01160950 ITU T 20 21 45 It is not requirement to function after the safety testing has been performed as long as there is not a hazardous condition afterwards If this is not a primary concern it is possible to pass these tests with less expensive protection solutions This usually involves supplying a heavier gauge telephone cord and TVS that replace the ones above It also requires mounting in a fire enclosure to contain any resultant fire and damage This is a choice that the designer and buyer must make when deciding on the end product s requirements The recommendations listed should not be construed as the final word on components that can be used with Teridian s products Other sources exist that we have not had experience with that could also be used in applications with our modem and FXO devices The customer is encouraged to investigate other sources of parts that are not listed here Rev 1 5 27 73 2901 Demo Board User Manual 2901 026 4 2 5 73 2901 EVM WW Demo Board Layout idian Semiconductor Corp po 3E 273 5 2901 Design L Figure 12 73M2901CE Worldwide Demo Board Layer and Silk Screen 28 Rev 1 5 2901 026 73 2901 Demo Board User Manu
17. ND ERJ 3GE YJ623V Panasonic 1 R12 62K P62KGCT ND ERJ 3GEYJ303V Panasonic 1 R13 21K P21 0KHCT ND ERJ 3EKF2102V Panasonic 1 R15 5 1K P5 1KGCT ND ERJ 3GEYJ512V Panasonic 2 R16 R17 100 P100HCT ND ERJ 3EKF1000V Panasonic 1 R20 20K P20KGCT ND ERJ 3GEYJ203V Panasonic 1 R23 33K P33KGCT ND ERJ 3GE YJ333V Panasonic 1 R24 750 P750GCT ND ERJ 3GEYJ751V Panasonic 1 R25 18 P18ECT ND ERJ 8GEYJ180V Panasonic 1 R26 820 P820GCT ND ERJ 3GEYJ821V Panasonic 1 R27 422 P422HCT ND ERJ 3EKF4220V Panasonic 1 R28 47K P47KGCT ND ERJ 3GEYJ473V Panasonic 1 T1 See Table 15 See Table 15 1 U1 2901CE_QFN TQFP32 Teridian 1 U2 74LVC4066D T 74LVC4066D T ND NXP 1 U4 TLP627 F T TL627F ND TLP627 F T or SD400 TOSHIBA 1 Y1 11 0592 MHz CTX409 ND ATS111 CTS 24 Rev 1 5 2901 026 73 2901 Demo Board User Manual 4 2 4 Recommended Components Used in the Demo Boards Several components are required in all modem designs that significantly affect the total BOM cost The following parts and suppliers have proven to supply reliable and cost effective components Table 15 Transformers and Suppliers Tested and Used with the 73M2901CE Manufacturer Wet Transformers DC Current OK Dry Transformers No DC Current Allied AEE 208D1 AEE 207D1 AEP 322D1 Datatronics LM72019 PT79281 Etal None currently available P1200 Sumida MIT4115V MIT4033L T50101 Wurth Midcom 671 8001 671 8005 671 8236 MU LF1 Umec None curren
18. V 23 transmission control Controlled by the Kn command CTS J1 3 Clear To Send Low true output Used for RTS CTS flow control and to indicate carrier is being sent in V 23 mode Controlled by the Kn command DSR J1 4 Data Set Ready Low true output Indicates the modem is present and ready for use DCD J1 5 Data Carrier Detect Low true output Indicates a carrier is being received Controlled by the Cn command RI J1 6 Ring Low true output Indicates a valid ring signal is being received Goes low for the duration the ring result code is being sent on RXD TXD J17 Transmit Digital Input Pin used as the digital data input for commands and data transmission Data Terminal Ready Low true Input Pin used by the terminal to control DTR J1 8 certain actions of the modem such as return to command mode terminate call V 23 turnaround reset and power down RXD J1 9 Receive Digital Output Pin used as the digital data output for echoing commands and for data reception GND J1 10 Demo board ground Table 5 73M2901CE EVM 600 Demo Board Telephone Network Interface Name Pin Description TIP 2 J2 1 No Connection TIP J2 2 Polarity independent connection to the telephone network RING J2 3 Polarity independent connection to the telephone network RING2 J2 4 No Connection 12 Rev 1 4 2901 026 73 2901 Demo Board User Manual Table 6 73M2901CE EVM 600 Demo Board
19. al 5 DC Loop Circuit Schematic The following circuit can be used to connect two modems for back to back testing Most modems require DC loop current is present for the DAA to operate correctly Generally they cannot be connected together directly without some provision for providing this current The following circuit can be used for this purpose This circuit also provides a termination impedance that is close to the 600 Ohms used in the U S and many other countries 12 12 R3 R6 10 O M 10 OHM Q4 Q3 Q1 Q2 2N2905 2N2905 2N2905 2N2905 R2 R5 690 OHM 690 OHM 22UF 50 V 22UF 50 V Figure 13 Simple DC Loop Simulator 6 Related Documentation The following 73 2901 documents are available from Teridian Semiconductor Corporation 73M2901CE Data Sheet 73M2901CE AT Command User Guide 7 Contact Information For more information about Teridian Semiconductor products or to check the availability of the 73M2901CE contact us at 6440 Oak Canyon Road Suite 100 Irvine CA 92618 5201 Telephone 714 508 8800 FAX 714 508 8878 Email modem support teridian com For a complete list of worldwide sales offices go to http www teridian com Rev 1 5 29 73 2901 Demo Board User Manual 2901 026 Revision History Revision Date Description 1 0 11 12 2008 Created from a merge of the USA version 1 2 and Worldwide version 2 1 DBUM documents Modified to use ne
20. apan 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 5002 2001 1 1 Getting Started Figure 1 shows the basic connections of the Demo Board e Use the supplied motherboard and 5 V power supply e The motherboard includes a 3 3 V regulator to power the 73M2901CE Demo Board e The motherboard also includes RS 232 level shifters and DCE connector to connect the demo board to a PC or other terminal device e 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 e 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 e 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 networ
21. ard Schematlic 21 Figure 10 73M2901CE Worldwide Daughter Board Pin Connections 22 Figure 11 73M2901CE Worldwide Demo Board 28 Figure 12 73 2901 Worldwide Demo Board Top Layer and Silk 28 Figure 13 Simple DC Loop 2 29 Tables Table 1 Recommended Operating 6 Table 2 Absolute Maximum nnne 6 Table 3 Termination Impedance Network Values 8 Table 4 73 2901 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 73 2901 EVM 600 Demo Board Bill 14 Table 8 S register Settings for Worldwide Modem Design 17 Table 9 Termination Impedance Network Values aaa nna 17 Table 10 Worldwide Country AC Impedance Requirement
22. ation barrier or for network protection to assure compliant performance for the DAA The transformer used for coupling will have an influence on the values of the components in the DAA circuitry The winding resistance inductances and other characteristics of the transformer affect the values of the impedance matching components Make sure you have the transformer manufacturer s recommended circuit values when using other transformers The values can be determined through simulations but may still require some adjustment to optimize the design Rev 1 5 7 73 2901 Demo Board User Manual 2901 026 3 73 2901 600 Demo Board During the past several years there been significant changes to the telecommunications device certification is handled Previously you were required to take your new product to an authorized certification laboratory to have certification testing performed The United States has fundamentally changed their approval procedures for telephone equipment They have introduced the concept of SDoC Self Declaration of Conformity implying that formal approval of a TCB Telecommunication Certification Body is not further necessary The definition of the technical requirements has been delegated to industry There is a choice of conformity testing but in general the manufacturer or his authorized representative must maintain technical documentation that includes a declaration of conformity a
23. ble Reference Modem 73M2901CE USA Demo Board RJ 11 Cables PSTN Emulator Figure 1 T73M2901CE Demo Board Basic Connections Rev 1 5 2901 026 73 2901 Demo Board User Manual 2 Design Considerations Keep OSCIN and signals as short as possible and locate the crystal near the pins Use 11 0592 MHz parallel mode crystal only Do not use ground planes under the oscillator circuit since this will increase the parasitic capacitance on the pins The values of C2 and C3 depend on the load capacitance rating of the crystal that is used not the 73M2901CE This load capacitance will typically be between 15 pF and 27 pF but usually 18 or 22 pF Parallel resonant crystals are tuned with a specific capacitive load and will be within their specifications when this load is used This rating is the capacitance measured between the crystal pins including all parasitic capacitances It is not the values of the capacitors used The selection of these capacitors can vary with the layout of the PCB so do not assume the values used with the 73M2901CE demo board are correct for all designs System noise is the most likely cause of poor Caller ID and low level receive performance The lowest amplitude signals that the modem will need to receive are on the order of 5 mV rms The Caller ID receive levels are also very low due to the requirement to have a high 60 AC input impedance while on hook Having a 2
24. eed these levels For these reasons some customers require 6kV or more isolation Protection from the telephone network connection is usually provided to prevent over voltage and over current conditions from causing the product to fail The PTC Positive Temperature Coefficient fuse F1 and thyristor Transient Voltage Suppressor or TVS E1 provide this protection on our demo boards The devices we chose are parts that meet the minimums required for UL 60950 and EN 60950 which have the most stringent requirements of the commonly used standards The 73M2901 designs are fully functional after the surge and power cross testing has been performed even though this is not a requirement to pass the requirement for off hook is that it not catch fire The following tables show the recommended components to meet various certification requirements The PTC fuses listed are through hole mounted but surface mount is also available for most types There are also different initial ON resistance versions that primarily affect the cost the lower the initial resistance the higher the cost There are also single fault telecom fuses that are designed to be used in these applications but they must be replaced if they are triggered The cost of these is about the same or more compared to the PTC types so there is little advantage to using them in most cases Table 17 Recommended PTC Fuses for CPE Applications Manufacturer Part Numbe
25. k 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 5 73 2901 Demo Board User Manual 2901 026 1 2 Recommended Operating Conditions and Absolute Maximum Ratings Table 1 Recommended Operating Conditions Parameter Conditions Rating Supply Voltage At the demo board power pins 2 7 10 3 6 VDC Supply Voltage At the mother board power connector 4 75 to 5 5 VDC Ambient Operating Temperature Without condensation or icing 40 to 85 Input Voltage for Digital Inputs 0 V to Voo 0 3 V Table 2 Absolute Maximum Ratings Parameter Rating Supply Voltage Vpp 0 5 to 4 0 VDC Supply Voltage Vpc 0 5 to 6 0 VDC Input Voltage for Digital Inputs 0 3 to VDD 0 5 VDC Storage Temperature 60 to 150 C Pin Voltage 0 3 to 5 5 V VDC ESD Tolerance Other pins 2kV Operation outside these rating limits may cause permanent damage to the device 1 3 Basic Connections PC or Terminal PC or Terminal RS 232 Cable Power 5V DC RS 232 Ca
26. mo Board Bill of Materials 24 4 2 4 Recommended Components Used in the Demo 25 4 2 5 73M2901CE EVM WW Demo Board PCB 28 5 DG Loop 5 uyu uuu eere Pre cere cns 29 6 Related 29 Y Contact Information 2 29 REVISION Y LL M 30 Rev 1 5 3 73 2901 Demo Board User Manual 2901 026 Figures Figure 1 73 2901 Demo Board Basic 6 Figure 2 73M2901CE 600 Demo Board 10 Figure 3 73 2901 EVM 600 Motherboard 11 Figure 4 73 2901 EVM 600 Demo Board Pin Connections 12 Figure 5 73 2901 EVM 600 Demo Board Bottom 2 15 Figure 6 73 2901 EVM 600 Demo Board Top 15 Figure 7 73 2901 EVM 600 Demo Board Top Silk Screen 16 Figure 8 73M2901CE Worldwide Demo Board Daughter Board 20 Figure 9 73M2901CE Worldwide Demo Board Motherbo
27. n S register settings are used Table 8 S register Settings for Worldwide Modem Design Termination Initialization String WW DAA 6000 ATS102 3S104 1S95 128S110 64S101 1S101 2S103 1 WW DAA CTR21 ATS102 3S104 1S95 128S110 64S101 1S101 2S103 1 WW DAA Australia 5102 35104 1595 1285110 645101 15101 25103 41 An example of this is the USR11 pin If the continuous Caller ID mode is selected by setting the MSB of S95 the USR11 pin will toggle during the Caller ID time If you are using S95 in this mode you should set the modem termination just before going off hook to assure that you are configured with the correct termination Table 8 shows the initialization strings needed for the 73 2901 Worldwide Demo Board If you choose to rearrange the USR controls in your design the string settings will of course need to be changed Table 9 Termination Impedance Network Values Component Values 600 Ohm 6000 ETSI TS 203 7500 150nF 2700 8200 120nF 2200 1 5 17 73 2901 Demo Board User Manual 2901 026 Table 10 Worldwide Country Impedance Requirements Country AC Impedance Country AC Impedance Country AC Impedance Argentina 600 Hong Kong 600 Oman 600 Australia Aust Hungary 600 Pakistan 600 Austria Aust Iceland ETSI TS 203 Peru 600 Bahrain ETSI TS 203 India Aust Phili
28. nd shows how compliance is achieved It is still a requirement to meet all the same technical requirements for electrical compatibility with the network TIA EIA IS 968 Part 68 electrical safely UL 60950 power cross and EMI Part 15 radiated emissions Unless you are equipped to perform the tests to verify the operation of your product it is still prudent to use a third party testing laboratory to assure compliance with applicable regulations The ACTA Administrative Council for Terminal Attachments is the body that now administers the telecom terminal equipment The FCC is no longer involved in any aspect of the process The ACTA is a privatized organization and administers all aspects of the telecom equipment See http www part68 org for information on the ACTA The 73M2901CE Demo Board is designed to meet all the applicable certification regulations defined in those regulations The 73M2901CE EVM 600 Demo Board design is intended for use in countries that use 600 resistive termination Although designed to meet the ACTA defined specifications the 73 2901 600 demo board is not a certified device and it is therefore not intended for use on the PSTN network It should only be used in a laboratory environment with network simulation equipment The network input protection is now standard worldwide so finding components that that meet UL 60950 Power Cross requirements are not too difficult Input current limiting and over vol
29. ppines 600 Belgium ETSI TS 203 Indonesia 600 Poland 600 Brazil 600 Ireland ETSI TS 203 Portugal ETSI TS 203 Bulgaria Aust Israel ETSI TS 203 Romania 600 Canada 600 Italy ETSI TS 203 Russia 600 Chile 600 Japan 600 Saudi 600 China 600 Jordan 600 Singapore 600 Columbia 600 Kazakhstan 600 Slovakia Aust Croatia ETSI TS 203 Kuwait 600 Slovenia ETSI TS 203 CTR TBR 21 ETSITS 203 Latvia ETSI TS 203 S Africa ETSI TS 203 Cyprus ETSI TS 203 Lebanon ETSI TS 203 S Korea 600 Czech Rep ETSITS 203 Luxembourg ETSI TS 203 Spain ETSI TS 203 Denmark ETSITS203 Macao 600 Sweden ETSI TS 203 Ecuador 600 Malaysia 600 Switzerland ETSI TS 203 Egypt 600 Malta ETSI TS 203 Syria 600 El Salvador 600 Mexico 600 Taiwan 600 Finland ETSITS203 Morocco ETSI TS 203 Thailand 600 France ETSITS203 Netherlands ETSI TS 203 UAE 600 Germany Aust New Zealand Aust UK ETSI TS 203 Greece ETSI TS 203 Nigeria ETSI TS 203 USA 600 Guam 600 Norway ETSI TS 203 Yemen 600 18 Rev 1 5 2901 026 73 2901 Demo Board User Manual 4 2 73 2901 EVM WW Hardware Design This section includes schematic drawings PCB layouts and bill of materials for the 73M2901CE WW Demo Board 4 2 1 73M 2901 EVM WW Schematic Diagrams Figure 8 and Figure 9 illustrate the schematics for the 73M2901CE EVM WW Demo Board and Motherboard Rev 1 5 19 73 2901 Demo Board User Manual UM_2901CE_026 This version supports only
30. r Voltage Current Rating Specification Bourns 015 600 600 150 968 4160950 MF RX012 250 250V 120mA ITU T K 20 21 45 Thinking Electronic Ind 6000015 600V 150mA TIA 968 A UL60950 KRT2500012xxx 250V 120mA ITU T K 20 21 45 Tyco Raychem TRF600 150 600V 150mA TIA 968 A UL60950 TRF250 120x 250V 120mA ITU T K 20 21 45 The TVS is important because large voltages can damage the DAA if the DAA transistor switches voltage ratings are exceeded The TVS works in conjunction with the PTC fuse by going into a low impedance state when the TVS are triggered which then causes the fuse to go to a high impedance until the fault condition is cleared This prevents the TVS from having to dissipate large amounts of energy if there is a persistent high voltage fault The TVS will also be triggered for short duration surges but this will usually not trigger the fuse since it may take seconds for the fuse to go to the high impedance mode depending on the current through it In any case these components work as a team to protect the DAA circuitry 26 Rev 1 5 2901 026 73 2901 Demo Board User Manual Table 18 Recommended TVS Over Voltage Protectors Manufacturer Part Number Voltage Current Rating Specification Bourns TISP4395T3BJR 275V 100A 10 5605 968 01160950 ITU T 20 21 45 Diodes Inc TB3100H 275V 100A 10 56045 968 U
31. s the Tip Ring path that acts as a shunt to EMI energy coming from the DAA The voltage rating of this part only needs to be high enough to tolerate voltages up to the TVS clamp voltage see the over voltage protection section that follows Rev 1 5 25 73 2901 Demo Board User Manual 2901 026 If TVS devices also provided on the Ring lines to earth ground the voltage rating for the Tip Ring capacitors only needs to be able to withstand the maximum TVS clamping voltage These and the TVS devices must be removed during the isolation voltage certification tests to prevent triggering the TVS devices or damaging the capacitors Over voltage and current protection are required for a reliable design that will survive the real world conditions that are encountered in the field Nearly all certifying bodies have specifications for the severe conditions that can occur due to lightning static discharge and even voltage cross to power mains In some cases these minimums are not adequate to survive some common fault conditions or ignore other conditions that would seem to be less severe but actually can present more stress to the design so many equipment providers will have even higher level or additional requirements not specified by the certifying bodies For example the minimum isolation voltage required for the telecom transformers is 2 kV but lightning strikes near power and telephone lines often far exc
32. tage protection are both universally required or advised Self resetting fuses are now available that not only protect the product but eliminate the need to replace parts if they are tripped These protection devices tend to be some of the more expensive components in the design but to scrimp on these in the initial design can cause problems latter when fixing the problem is more expensive 3 4 Using the 73M2901CE EVM 600 Demo Board The schematic in Figure 2 shows the design for the 73M2901CE EVM 600 Demo Board The design uses a wet transformer that uses the transformer as the DC load on the line The advantage to using this topology is that the BOM cost can be lower compared to a dry transformer which passes the DC current through an external circuit that simulates an inductor A dry transformer can be made much smaller so if small size is important a dry transformer is preferred Table 3 shows the termination impedances for 600 resistive as well as ETSI TS 203 and Australian complex impedances With these three terminations worldwide terminations impedance requirements can be met Other demo boards are available to support these other terminations The 73M2901CE EVM 600 Demo Board uses a wet transformer design that has a 600 O resistive termination Table 3 Termination Impedance Network Values Termination Terminator Component Values 600 Ohm 6000 ETSI TS 203 complex 7500 150nF 2700 Australia 8
33. tion The actual EMI frequencies and levels that must be controlled are not always the same since EMI generated in any part of the design can end up being radiated from the telephone connection so some characterization of the emissions is needed to determine the best fit for the frequencies that are present The parts we use have good characteristics for the board when used alone but may not work in every application that is encountered Inductors can have a wide range of impedance versus frequency depending on the materials that are used so there cannot be one size fits all solution for every application Be sure the inductors are not located between the Tip and Ring connection and the over voltage over current protection in the design You do not want to have the surge current and voltage across these devices Table 16 contains some inductors that might be used in your application Table 16 EMI Inductors for the Tip Ring Signal Path Manufacturer Part Number Value or Z 9 Freq Rated Current Allied MC20A 4R7M RC 4 7 uH 220 mA Laird Steward HZ0805C202R 00 2 100MHz 300 mA TDK NLV32T 4R7J PF 4 7 uH 220 mA There are high voltage capacitors connected to Tip and Ring to earth ground that also aid in limiting EMI to the outside connections These must have the same voltage ratings as the isolation required for the design i e normally the transformer isolation voltage rating There is also a capacitor acros
34. tly available UTBO1542 The transformers listed in Table 15 are used in the 73M2901CE Demo Boards The transformers listed as wet are suitable in applications that pass the DC current through the transformer windings These transformers are physically larger than the dry types in order to prevent saturation with DC current and generally have lower return loss performance These are used in the EVM 600 type designs The dry transformers require a separate DC holding circuit or gyrator Q1 Q3 and associated circuitry in Figure 8 to provide a DC load to the network This circuit is also used for pulse dialing when required and must present a high AC impedance to the line so that AC audio performance is not compromised These transformers are used on the 73M2901CE EVM WW Demo Boards The Tip Ring inductors on the demo board are 4 7uH and are used to control EMI that might be coupled out to the line Inductors that are intended for EMI control applications are sometimes rated for a particular impedance at some frequency e g 2 kO at 100 MHz Since the telephone connections also carry DC current these inductors must also work with the DC current that may be present All inductors in the Tip Ring path must be rated to operate with a minimum of 200 mA so that performance is not overly degraded at high frequencies by core saturation Inductance also tends to go down with temperature so this must also be factored into the component selec
35. utput Pin used as the digital data output for echoing commands and for data reception RTS 4 Request Send High true input Used for RTS CTS flow control and V 23 transmission control Controlled by the Kn command Clear To Send High true output Used for RTS CTS flow control and to CTS 5 indicate carrier is being sent in V 23 mode Controlled by the Kn command DSR 6 Data Set Ready High true output Indicates the modem is present and ready for use DCD 8 Data Carrier Detect High true output Indicates a carrier is being received Controlled by the Cn command Data Terminal Ready High true Input Pin used by the terminal to DTR 20 control certain actions of the modem such as return to command mode terminate call V 23 turnaround reset and power down RI 22 Ring High true output Indicates a valid ring signal is being received Goes low for the duration the ring result code is being sent on RXD Rev 1 5 23 73 2901 Demo Board User Manual 2901 026 4 2 3 73 2901 EVM WW Demo Board Bill of Materials Table 14 73M2901CE Worldwide Demo Board Bill of Materials Equivalent parts are available from Datatronics Sumida Umec and Allied Quant Reference Part DigiKey Manufacturer P N Manufacturer 1 BR1 HD0
36. w corporate format and assign a Document Number Section on the AT Command has been moved to its own document 2801 027 141 2 19 2009 In Table 8 corrected the entries for WW DAA CTR21 WW DAA Australia 1 2 8 7 2009 Replaced the Daughter Board schematic in Figure 8 1 3 10 1 2009 Fixed the corrupted schematics in Figure 2 and Figure 8 1 4 1 15 2010 Replaced the schematic in Figure 9 with a new schematic Removed Section 5 the 73M2901CE CL differences were moved to the 73M2901CE Data Sheet and subsequent sections were renumbered 1 5 3 17 2010 Updated the schematic in Figure 8 Replaced the layouts in Figure 10 Figure 11 and Figure 12 Updated the Bill of Materials in Table 14 Updated the first part of Section 4 1 Added Section 4 2 4 Recommended Components Used in the Demo Boards 30 Rev 1 5

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