ML6680

January 1997 ML6680 Token Ring Copper-to-Fiber Converter GENERAL DESCRIPTION The ML6680 is a single-chip conversion between Token Ring ISO/IEC8802-5 copper-based media and Token Ring ISO/IEC8802-5 fiber-based media. The ML6680 fiber-optic interface contains a data quantizer, circuitry for fiber optic key signal generation and recognition, pin-selectable signal switching, and current driven transmitter outputs. The ML6680 copper interface consists of a twisted pair line equalizer, receive squelch circuit, pin selectable phantom wire fault detection and signal switching, and a transmit driver. This section supports the ISO/IEC8802-5 standard requirements. The ML6680 provides an optional PECL compatible interface. The ML6680 may be configured to one of four modes: 1. 2. 3. 4. Standard Media Converter Concentrator Media Converter Lobe or Ring Out Port Media Converter Ring In Port Media Converter FEATURES s s s s s s s s s Single-chip copper-to-fiber converter for Token Ring 16Mbps and 4Mbps data rates with the same external components Four modes of operation covering a wide variety of applications Full duplex operation Highly stable data quantizer with 55dB input dynamic range Current driven fiber optic LED driver for accurate launch power Current driven output for low RFI noise and low jitter Capable of driving 100Ω UTP or 150Ω STP Pin selectable phantom wire fault detection and signal switching BLOCK DIAGRAM EQA TPINP TPINN TWISTED PAIR EQUALIZER LED DRIVER EQB RTSETOP OPVC...