GENERAL DESCRIPTIONS
The MTD981A is a highly integrated analog interface IC for twisted pair Ethernet applications. It provides the active circuitry to interface IEEE 802.3 media independent interface (MII) compliant controllers to 10BASE-T or 100BASE-TX media. It also provides an ECL-type interface for use with 100BASE-FX fiber networks. The MTD981A supports full duplex operation at 10 and 100 Mbps. Its operating condition can be set by using Auto-Negotiation, parallel detection, or manual control. The MTD981A is ideal as a media interface for 10BASE-T/100BASE-TX network interface cards, motherboards, 10/100 repeaters, switching hubs, and external PHYs.

FEATURES
• 10BASE-T, 100BASE-TX, and 100BASE-FX IEEE-802.3 compliant transmit and receive functions
• IEEE 802.3u Clause 28 compliant Auto-Negotiation function
• Full duplex operation capable
• Baseline wander compensation
• Supports 1:1 or 1.25:1 transmit transformer
• Output waveform shaping – no external filter required
• LED indicators: LINK, TX, RX, COL, 100, 10, FDX
• Single 3.3-V power supply with 5V tolerant I/O
• 100-pin PQFP package