M02042G-4D03-T

Overview

The M02042G-4D03-T is a CMOS LED driver IC designed for high-speed optical fiber transmission systems. It supports data rates exceeding 300 Mbps and operates on a single +5V to +3.3V supply. The device features programmable output current ranging from 5 mA to 120 mA, set via an external resistor. Key functional blocks include a pre-emphasis circuit for improved rise/fall times under 500 ps, temperature compensation adjustable over a 500–10,000 ppm/°C range, and pulse width adjustment with a ±500 ps continuous range. It accepts differential PECL inputs or single-ended CMOS inputs via the VREF pin.

Feature Summary

• CMOS technology optimized for low cost, power consumption, and reliability in optical fiber applications
• Programmable LED drive current and temperature compensation via external resistors
• Integrated pre-emphasis circuit to enhance LED turn-on time with configurable RC network
• Flexible input compatibility supporting differential PECL signals and single-ended CMOS through VREF

Applications

• FDDI (Fiber Distributed Data Interface) systems
• Fast Ethernet optical links
• Fibre Channel interfaces
• OC3/STM-1 transmission networks
• IEEE1394 (FireWire) optical connections

Procurement Notes

Verify that the suffix 'G' confirms RoHS compliance as indicated in the ordering information. Confirm the specific revision digit represented by 'xxx' matches your design requirements. Ensure the package type (TSSOP20 or QSOP16) aligns with your PCB footprint. Check if the part is supplied in waffle pack, expanded wafer, tape, or reel format based on your manufacturing needs. Contact the manufacturer for exact revision digits if not explicitly defined in your bill of materials.

Selection Notes

Select this component when designing low-cost optical transmitters requiring drive currents up to 120 mA. Consider the TSSOP20 or QSOP16 packages based on space constraints. Use the RTSET pins to configure nominal current and temperature compensation. Utilize the PWA pins for pulse shaping if signal integrity requires adjustment. Ensure the supply voltage is within the 3.0V to 5.5V range for proper operation.

Part Context

This part belongs to the MC2042 series of LED drivers manufactured by Mindspeed Technologies, now part of MACOM Technology Solutions. The 'M02042G-4D03-T' designation follows Mindspeed's ordering convention where 'M0' prefixes the part number, though the device is marked as MC2042. The 'G' indicates RoHS compliance, and the suffix denotes specific packaging or revision details.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Users should consult Mindspeed or MACOM technical support for qualified alternatives or cross-references compatible with the MC2042-4 specifications.

FAQ

How is the LED drive current disabled?

There is no dedicated disable pin. The LED drive current can be disabled by disabling the current flowing out of the RTSET pin, typically using a MOSFET at the RTSET node.

What is the function of the VDD2 pins?

The VDD2 pins serve as LED shorting connections to speed up the LED switch-off time. For laser driving, these pins may be left floating to disable the clamping function.

How is temperature compensation implemented?

Temperature compensation is set by two resistors, R1 and R2, connected to the RTSET and RTSET2 pins. This allows adjustment over a 500 to 10,000 ppm/°C range to minimize output power variations.