ML6680

Single-chip copper-to-fiber converter for Token Ring
16Mbps and 4Mbps data rates with the sameexternal components
Four modes of operation covering a wide varietyof applications
Full duplex operation
Highly stable data quantizer with 55dB inputdynamic range
Current driven fiber optic LED driver for accuratelaunch power
Current driven output for low RFI noise and low jitter
Capable of driving 100? UTP or 150? STP
Pin selectable phantom wire fault detection andsignal switching

The ML6680 is a single-chip conversion between TokenRing ISO/IEC8802-5 copper-based media and Token Ring ISO/IEC8802-5 fiber-based media. The ML6680 fiber-opticinterface contains a data quantizer, circuitry for fiber optickey signal generation and recognition, pin-selectablesignal switching, and current driven transmitter outputs.

The ML6680 copper interface consists of a twisted pairline equalizer, receive squelch circuit, pin selectablephantom wire fault detection and signal switching, and atransmit driver. This section supports the ISO/IEC8802-5standard requirements. The ML6680 provides an optionalPECL compatible interface.

The ML6680 may be configured to one of four modes:
1. Standard Media Converter
2. Concentrator Media Converter
3. Lobe or Ring Out Port Media Converter
4. Ring In Port Media Converter