TLF11724

ADVANCE INFORMATION

October 1992

DP83220

CDL

General Description

The Copper Data Link (CDL) Transceiver is an integrated

circuit designed to interface directly with the National Semi-

conductor FDDI Chip Set or other FDDI PHY silicon allow-

ing low cost FDDI compatible data links over copper based

media The DP83220 Transceiver with the proper compen-

sation selected will allow links of up to 100 meters over

both Shielded Twisted Pair (STP) and Datagrade unshielded

Twisted Pair (DTP) CDL surpasses a Bit Error Rate (BER)

signed to meet the SDDI specification for FDDI transmission

across Type 1 STP cable when used in conjunction with the

appropriate transformerfilter module from Pulse Engineer-

ing

Features

Y

Fully compatible with current FDDI PHY standard

Y

Fully compatible with the SDDI PMD specification

Y

Y

Isolated TX and RX power supplies for minimum noise

coupling

Y

Allows use of Type 1 STP and Category 5 DTP cables

Y

No Transmit Clock required

Y

Loopback feature for board diagnostics

Y

Link Detect input provided

Block Diagram

Transmit Section

TLF11724 – 1

Receive Section

TLF11724 – 2

FIGURE 1 DP83220 Transceiver Block Diagram

C1995 National Semiconductor Corporation

RRD-B30M105Printed in U S A