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| 型号： | 73M2901CE-EVM-WW |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 25/30页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO 73M2901CE WORLDWIDE |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 系列： | * |
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UM_2901CE_026
73M2901CE 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
Allied
Datatronics
Etal
Sumida
Wurth-Midcom
Umec
“Wet” Transformers (DC Current OK)
AEE-208D1
LM72019
None currently available
MIT4115V
671-8001, 671-8005
None currently available
“Dry” Transformers (No DC Current)
AEE-207D1, AEP-322D1
PT79281
P1200
MIT4033L, T50101
671-8236-MU/-LF1
UTB01542
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 k ? 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 selection. 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
Allied
Laird (Steward)
TDK
Part Number
MC20A-4R7M-RC
HZ0805C202R-00
NLV32T-4R7J-PF
Value, μH or Z @ Freq.
4.7 μH
2 k ? @ 100MHz
4.7 μH
Rated Current
220 mA
300 mA
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 across 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
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| 73M2901CE-IGV/F | 功能描述:电信线路管理 IC V.22bis Single-Chip Modem RoHS:否 制造商:STMicroelectronics 产品:PHY 接口类型:UART 电源电压-最大:18 V 电源电压-最小:8 V 电源电流:30 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VFQFPN-48 封装:Tray |
| 73M2901CE-IGVR/F | 功能描述:电信线路管理 IC V.22bis Single-Chip Modem RoHS:否 制造商:STMicroelectronics 产品:PHY 接口类型:UART 电源电压-最大:18 V 电源电压-最小:8 V 电源电流:30 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VFQFPN-48 封装:Tray |
| 73M2901CE-IM/F | 功能描述:电信线路管理 IC V.22bis Single-Chip Modem RoHS:否 制造商:STMicroelectronics 产品:PHY 接口类型:UART 电源电压-最大:18 V 电源电压-最小:8 V 电源电流:30 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VFQFPN-48 封装:Tray |
| 73M2901CE-IM/F1 | 功能描述:电信线路管理 IC RoHS:否 制造商:STMicroelectronics 产品:PHY 接口类型:UART 电源电压-最大:18 V 电源电压-最小:8 V 电源电流:30 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VFQFPN-48 封装:Tray |
| 73M2901CE-IMR/F | 功能描述:电信线路管理 IC V.22bis Single-Chip Modem RoHS:否 制造商:STMicroelectronics 产品:PHY 接口类型:UART 电源电压-最大:18 V 电源电压-最小:8 V 电源电流:30 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VFQFPN-48 封装:Tray |
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