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LAN8740 датащи(PDF) 14 Page - Microchip Technology |
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LAN8740 датащи(HTML) 14 Page - Microchip Technology |
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14 / 136 page ![]() LAN8740A/LAN8740Ai DS00001987A-page 14 2013-2015 Microchip Technology Inc. TABLE 2-6: ANALOG REFERENCE PINS Num Pins Name Symbol Buffer Type Description 1 External 1% Bias Resistor Input RBIAS AI This pin requires connection of a 12.1 kΩ (1%) resistor to ground. Refer to the LAN8740A/LAN8740Ai reference schematic for connection information. Note: The nominal voltage is 1.2 V and the resistor will dissipate approximately 1 mW of power. TABLE 2-7: POWER PINS Num Pins Name Symbol Buffer Type Description 1 +1.8 V to +3.3 V Variable I/O Power VDDIO P +1.8 V to +3.3 V variable I/O power. Refer to the LAN8740A/LAN8740Ai reference schematic for connection information. 1 +1.2 V Digital Core Power Supply VDDCR P Supplied by the on-chip regulator unless config- ured for regulator off mode via the REGOFF con- figuration strap. Refer to the LAN8740A/LAN8740Ai reference schematic for connection information. Note: 1 µF and 470 pF decoupling capaci- tors in parallel to ground should be used on this pin. 1 +3.3 V Channel 1 Analog Port Power VDD1A P +3.3 V Analog Port Power to Channel 1. Refer to the LAN8740A/LAN8740Ai reference schematic for connection information. 1 +3.3 V Channel 2 Analog Port Power VDD2A P +3.3 V Analog Port Power to Channel 2 and the internal regulator. Refer to the LAN8740A/LAN8740Ai reference schematic for connection information. 1 Ground VSS P Common ground. This exposed pad must be con- nected to the ground plane with a via array. |
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