DP83848JSQSLASHNOPB datasheet(9/84 Pages) TI1

9 / 84 page

DP83848H, DP83848J, DP83848K, DP83848M, DP83848T

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SNLS250E – MAY 2008 – REVISED APRIL 2015

4.9

10 Mb/s and 100 Mb/s PMD Interface

SIGNAL

TYPE

PIN #

DESCRIPTION

NAME

Differential common driver transmit output (PMD Output Pair). These differential outputs are

automatically configured to either 10BASE-T or 100BASE-TX signaling.

TD-, TD+

I/O

14, 15

In Auto-MDIX mode of operation, this pair can be used as the Receive Input pair.

These pins require 3.3-V bias for operation.

Differential receive input (PMD Input Pair). These differential inputs are automatically configured to

accept either 100BASE-TX or 10BASE-T signaling.

RD-, RD+

I/O

11, 12

In Auto-MDIX mode of operation, this pair can be used as the Transmit Output pair.

These pins require 3.3-V bias for operation.

4.10 Special Connections

SIGNAL

TYPE

PIN #

DESCRIPTION

NAME

RBIAS

Bias Resistor Connection. A 4.87-k

Ω 1% resistor should be connected from RBIAS to GND.

Power Feedback Output. Parallel caps, 10 µF (Tantalum preferred) and 0.1 µF, should be placed

PFBOUT

close to the PFBOUT. Connect this pin to PFBIN1 (pin 16) and PFBIN2 (pin 30). See

Section 7.2.1.3 for proper placement pin.

Power Feedback Input. These pins are fed with power from PFBOUT pin. A small capacitor of 0.1

PFBIN1

µF should be connected close to each pin.

PFBIN2

Note: Do not supply power to these pins other than from PFBOUT.

RESERVED I/O

8,9,10

RESERVED: These pins must be left unconnected.

4.11 Power Supply Pins

SIGNAL NAME

PIN #

DESCRIPTION

IOVDD33

1, 26

I/O 3.3-V Supply

IOGND

I/O Ground

DGND

Digital Ground

AVDD33

Analog 3.3-V Supply

AGND

13, 17

Analog Ground

Pin Configuration and Functions

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Product Folder Links: DP83848H DP83848J DP83848K DP83848M DP83848T

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