LAN8720AI datasheet(14/79 Pages) SMSC

14 / 79 page

Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support

Datasheet

Revision 1.4 (08-23-12)

SMSC LAN8720A/LAN8720Ai

DATASHEET

Table 2.6 Analog Reference Pins

NUM PINS

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

External 1%

Bias Resistor

Input

RBIAS

This pin requires connection of a 12.1k ohm (1%)

resistor to ground.

Refer to the LAN8720A/LAN8720Ai reference

schematic for connection information.

Note:

The nominal voltage is 1.2V and the

resistor will dissipate approximately

1mW of power.

Table 2.7 Power Pins

NUM PINS

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

+1.6V to

+3.6V

Variable I/O

Power

VDDIO

+1.6V to +3.6V variable I/O power

Refer to the LAN8720A/LAN8720Ai reference

schematic for connection information.

+1.2V Digital

Core Power

Supply

VDDCR

Supplied by the on-chip regulator unless

configured for regulator off mode via the

REGOFF configuration strap.

Refer to the LAN8720A/LAN8720Ai reference

schematic for connection information.

Note:

1 uF and 470 pF decoupling capacitors

in parallel to ground should be used on

this pin.

+3.3V

Channel 1

Analog Port

Power

VDD1A

+3.3V Analog Port Power to Channel 1

Refer to the LAN8720A/LAN8720Ai reference

schematic for connection information.

+3.3V

Channel 2

Analog Port

Power

VDD2A

+3.3V Analog Port Power to Channel 2 and the

internal regulator.

Refer to the LAN8720A/LAN8720Ai reference

schematic for connection information.

Ground

VSS

Common ground. This exposed pad must be

connected to the ground plane with a via array.

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