DP83848C_07 datasheet(14/82 Pages) NSC

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1.7 10 Mb/s and 100 Mb/s PMD Interface

1.8 Special Connections

1.9 Power Supply Pins

Signal Name

Type

Pin #

Description

TD-, TD+

I/O

16, 17

Differential common driver transmit output (PMD Output Pair).

These differential outputs are automatically configured to either

10BASE-T or 100BASE-TX signaling.

In Auto-MDIX mode of operation, this pair can be used as the Re-

ceive Input pair.

These pins require 3.3V bias for operation.

RD-, RD+

I/O

13, 14

Differential receive input (PMD Input Pair). These differential in-

puts are automatically configured to accept either 100BASE-TX

or 10BASE-T signaling.

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

Transmit Output pair.

These pins require 3.3V bias for operation.

Signal Name

Type

Pin #

Description

RBIAS

Bias Resistor Connection. A 4.87 k

Ω 1% resistor should be con-

nected from RBIAS to GND.

PFBOUT

Power Feedback Output. Parallel caps, 10

µ F (Tantalum pre-

ferred) and 0.1

µF, should be placed close to the PFBOUT. Con-

nect this pin to PFBIN1 (pin 18) and PFBIN2 (pin 37). See

Section 5.4 for proper placement pin.

PFBIN1

PFBIN2

Power Feedback Input. These pins are fed with power from

PFBOUT pin. A small capacitor of 0.1

µF should be connected

close to each pin.

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

PFBOUT.

RESERVED

I/O

8, 9, 10, 11,

RESERVED: These pins must be left unconnected.

RESERVED

I/O

20, 21

RESERVED: These pins must be pulled-up through 2.2 k

Ω resis-

tors to AVDD33 supply.

Signal Name

Pin #

Description

IOVDD33

32, 48

I/O 3.3V Supply

IOGND

35, 47

I/O Ground

DGND

Digital Ground

AVDD33

Analog 3.3V Supply

AGND

15, 19

Analog Ground

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