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. FEATURES ■ 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
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