SMSC 公司的LAN8710和LAN8720是高性能低功耗10BASE-T/100BASE-TX以太网收发器,特别设计用于消费类电子,工业和企业应用. LAN8710和LAN8720具有业界最小的占位面积,功耗比现有的收发器要低40%.本文介绍了LAN8710和LAN8720的主要特性,方框图, 100Base-TX 数据通路和接收数据通路, 以太网铜线接口框图和EVB8720以太网PHY评估板电路图与材料清单.

SMSCs LAN8710 and LAN8720 are high-performance, low-power, small footprint 10BASE-T/100BASE-TX transceivers specifically designed for todays consumer electronics, industrial and enterprise applications. The LAN8710/LAN8720 are the industrys smallest footprint solutions with more than 40% lower power consumption saving than existing transceivers. The LAN8710/8720 have integrated voltage regulator and ESD protection components to help reduce Bill of Material (BOM) costs.

The LAN8710 interfaces to the MAC layer using a variable voltage digital interface via the standard MII and the LAN8720 interfaces via a reduced RMII interface. Both devices support HP Auto-MDIX, employ SMSCs proprietary flexPWR technology and are available in both extended commercial and industrial temperature range options. SMSCs complimentary LANCheck online design review service is available for customers who have selected our products for their application design-in*.

The LAN8720/LAN8720i is compliant with IEEE 802.3-2005 standards (RMII Pins tolerant to 3.6V) and supports both IEEE 802.3-2005 compliant and vendor-specific register functions. It contains a fullduplex 10-BASE-T/100BASE-TX transceiver and supports 10-Mbps (10BASE-T) operation, and 100-Mbps (100BASE-TX) operation. The LAN8720/LAN8720i can be configured to operate on a single 3.3V supply utilizing an integrated 3.3V to 1.2V linear regulator. An option is available to disable the linear

regulator to optimize system designs that have a 1.2V power supply available. This allows for the use of a high efficiency external regulator for lower system power dissipation.

LAN8710/LAN8720亮点:

Excellent ESD protection levels without any external protection devices

Integrated DSP with adaptive equalizer

Integrated 1.2V linear regulator

Incorporates flexPWR technology

Industry leading power consumption

40% reduction from existing solutions

Flexible I/O voltage range from 3.6V to 1.6V

Extremely low energy detect standby mode

Requires only a low cost 25MHz crystal for RMII

Industrial temperature range -40° to 85℃ options available (LAN8710i/8720i) and extended commercial temperature range 0°to 85℃ options available (LAN8710/8720)

Package options:

LAN8710: 5x5mm 32-pin QFN package (MII/RMII)

LAN8720: 4x4mm 24-pin QFN package (RMII only)

LAN8710/LAN8720目标应用:

High-definition TV (HDTV)

Set-top Boxes (STBs)

Digital Video Recorders (DVRs)

Personal Video Recorders (PVRs)

Networked Printers and Servers

Gaming Consoles

Telecommunications

POS Terminals

Industrial



图1.LAN8710/LAN8720架构框图



图2.100Base-TX 数据通路



图3.接收数据通路



图4.LAN8710/LAN8720系统框图



图5.简化的LAN8710/LAN8720应用框图



图6.高级系统框图的电源



图7.铜线接口框图

EVB8720以太网PHY评估板

EVB8720:Ethernet PHY Evaluation Board

Introduction

The EVB8720 is a PHY Evaluation Board (EVB) that interfaces a MAC controller to the LAN8720 Ethernet PHY via a standard 40-pin MII connector (adapted for use in RMII configuration). The LAN8720 is connected to an RJ-45/Integrated Magnetics Ethernet Jack for 10/100 connectivity.

Product Description

The EVB8720 is designed to plug into a users Ethernet MAC test system using a 40-pin MII connector. The MII connector used on the EVB8720 is an AMP 40-pin right-angle through-hole MII connector (i.e., AMP P/N 6-5174218-2). The mating connector is an AMP P/N 6-5174217-2.

EVB8720以太网PHY评估板主要特性:

Standard RJ-45 Connector with integrated magnetics and LED indicators for Link and Activity

On board LED indicators for

Speed 100
    
Full Duplex
    
Supports RMII operation
    
Interfaces through 40-pin Connector
    
Powered by 5.0V from the 40-Pin Connector
    
Includes Probe Points on All RMII Data and Control Signals for Troubleshooting

Includes 25MHz Crystal for Internal PHY Reference

Sources RMII REF_CLK

Supports user configuration options including PHY address selection
    
Integrated 3.3V Regulator



Applications

Verify MAC to PHY interface

Support testing of FPGA implementations of MAC

Assist interoperability test of various networks

Verify performance of HP AutoMDIX feature

EVB8720 Block Diagram



图8.EVB8720以太网PHY评估板框图



图9.EVB8720以太网PHY评估板电路图

材料清单(BOM):