MIC3000

MIC3000 General Description

General DescriptionThe MIC3000 enables the implementation of sophisticated, hot-pluggable fiber optic transceivers with intelligent laser control and Digital Diagnostic Monitoring Interface per SFF-8472. It essentially integrates all non-datapath functions of an SFP transceiver into a tiny 4mm x 4mm MLF® package. It also works well as a microcontroller peripheral in transponders or 10Gbps transceivers.A highly configurable automatic power control (APC) circuit controls laser bias. Bias and modulation are temperature compensated using dual DACs, an on-chip temperature sensor, and NVRAM look-up tables. A programmable internal feedback resistor provides unprecedented dynamic range for APC. Controlled laser turn-on facilitates hot-plugging.An analog-to-digital converter converts the measured temperature, voltage, bias current, transmit power, and received power from analog-to-digital. Each parameter is compared against user-programmed warning and alarm thresholds. Analog comparators and DACs provide high-speed monitoring of received power and critical laser operating parameters.An interrupt output, power-on hour meter, and data-ready bits add user friendliness beyond SFF-8472. The interrupt output and data-ready bits reduce overhead in the host system. The power-on hour meter logs operating hours using an internal real-time clock and stores the result in NVRAM.Communication with the MIC3000 is via an industry standard 2-wire serial interface. Nonvolatile memory is provided for serial ID, configuration, and separate OEM and user scratchpad spaces. Two-level password protection guards against data corruption.Features• APC or constant-current laser bias• Supports multiple laser types and bias circuit topologies• Drives external low-cost BJT for laser bias• Integrated digital temperature sensor• Temperature compensation of modulation, bias, and fault levels via NVRAM look-up tables• Direct interface to SY88932, SY88982, SY89307 and other drivers• NVRAM to support GBIC/SFP serial ID function• User writable EEPROM scratchpad• Diagnostic monitoring interface per SFF-8472   – Monitors and reports critical parameters: temperature, bias current, TX and RX optical power, and supply voltage   – S/W control and monitoring of TXFAULT, RXLOS, RATESELECT, and TXDISABLE   – External calibration• Power-on hour meter• Interrupt capability• Extensive test and calibration features• 2-wire I2C compatible serial interface• SFP MSA and SFF-8472 compliant• 3.0V to 3.6V power supply range• 5V-tolerant I/O• 4mm x 4mm 24-pin MLF® packageApplications• SFF/SFP optical transceivers• SONET/SDH transceivers and transponders• Fibre channel transceivers• 10Gbps transceivers• Free space optical communications• Proprietary optical links