DP83846A DsPHYTER® — Single 10/100 Ethernet Transceiver
Preliminary
April 2000
DP83846A DsPHYTER
®
— Single 10/100 Ethernet Transceiver
General Description
The DP83846A is a full feature single Physical Layer
device with integrated PMD sublayers to support both
10BASE-T and 100BASE-TX Ethernet protocols over Cat-
egory 3 (10 Mb/s) or Category 5 unshielded twisted pair
cables.
The DP83846A is designed for easy implementation of
10/100 Mb/s Ethernet home or office solutions. It interfaces
to Twisted Pair media via an external transformer. This
device interfaces directly to MAC devices through the IEEE
802.3u standard Media Independent Interface (MII) ensur-
ing interoperability between products from different ven-
dors.
The DP83846A utilizes on chip Digital Signal Processing
(DSP) technology and digital Phase Lock Loops (PLLs) for
robust performance under all operating conditions,
enhanced noise immunity, and lower external component
count when compared to analog solutions.
Features
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IEEE 802.3 ENDEC, 10BASE-T transceivers and filters
IEEE 802.3u PCS, 100BASE-TX transceivers and filters
IEEE 802.3 compliant Auto-Negotiation
Output edge rate control eliminates external filtering for
Transmit outputs
BaseLine Wander compensation
5V/3.3V MAC interface
IEEE 802.3u MII (16 pins/port)
LED support (Link, Rx, Tx, Duplex, Speed, Collision)
Single register access for complete PHY status
10/100 Mb/s packet loopback BIST (Built in Self Test)
Low-power 3.3V, 0.35um CMOS technology
5V tolerant I/Os
80-pin LQFP package (12w) x (12l) x (1.4h) mm
System Diagram
Magnetics
DP83846A
Ethernet MAC
MII
10/100 Mb/s
DsPHYTER
RJ-45
10BASE-T
or
100BASE-TX
25 MHz
Clock
Status
LEDs
Typical DsPHYTER application
PHYTER
®
and TRI-STATE
®
are registered trademarks of National Semiconductor Corporation.
©
2000 National Semiconductor Corporation
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
