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參數(shù)資料
| 型號： | LDB901 |
| 英文描述： | LDB901 - LDB901 Universal Demo Board for 10BASE-T and AUI Applications |
| 中文描述： | LDB901 - LDB901通用演示板的10Base - T的和AUI應(yīng)用 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 224K |
| 代理商： | LDB901 |
LDB901
—
Universal Demo Board for 10BASE-T and AUI Applications
8
Developer Manual
2.3
Power Supply
The LDB901 Demo Board requires a single 5V power supply.
2.3.1
Power Supply Option
The LDB901 is designed with a voltage regulator (JP19) that can be jumpered to supply either 5V
or 3.3V to the LXT901, LXT907, LXT901A, LXT907A or LXT908 devices. If pins 1 and 2 are
jumpered, 5V operation is selected. If pins 2 and 3 are jumpered, the power supply is converted to
3.3V.
Table 1
shows configuration of the jumper circuitry for the transceiver power supply options.
2.3.1.1
Signal Attenuation Circuitry
Signal attenuation circuitry (JP20, JP21 and JP22) is provided for 3.3V operation. During 3.3V
operation these jumpers should be left open to enable signal attenuation. During 5V operation the
jumpers should be installed to bypass signal attenuation.
2.4
Configuration Options
The LDB901 Demo Board can be configured for evaluation of either the LXT901, LXT907,
LXT901A, LXT907A or LXT908 Universal Transceivers with a few minor modifications.
2.4.1
Magnetics
The LDB901 is supplied from the factory with magnetics recommended for the applicable
transceiver ordered. Jumpers JP12 and JP13 select the magnetics termination circuitry. These two
jumpers and the magnetics themselves are the only modifications required to set up the various
Ethernet Transceivers. Configuration for the various evaluation setups are described below.
Table 1. Power Supply Configuration
Jumper Placement
Jumper
5V Operation
3.3V Operation
JP19
Jumper pins 1 & 2
Jumper pins 2 & 3
JP20
Jumper Installed
Jumper Open
JP21
Jumper Installed
Jumper Open
JP22
Jumper Installed
Jumper Open
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