ADN2847ACPZ-32

Laser Drivers Overview

The ADN2847ACPZ-32 is a dual-loop laser diode driver from Analog Devices, designed for optical communication systems. It operates at data rates from 50 Mbps to 3.3 Gbps with single 3.3 V supply voltage. The device integrates closed-loop control for average power and extinction ratio using monitor photodiode feedback. Key electrical parameters include a bias current range of 2 mA to 100 mA, modulation current range of 5 mA to 80 mA, and typical rise/fall time of 80 ps. It supports FEC rates and includes programmable alarms for laser fail and degrade conditions.

Laser Drivers Feature Summary

• Dual-loop closed-loop control algorithm manages both average optical power and extinction ratio after initial factory setup.
• Integrated monitor photodiode functionality enables wavelength fixing for DWDM applications without external components.
• Programmable alarm system detects laser fail and laser degrade states, supporting automatic laser shutdown protocols.

Laser Drivers Applications

• SONET OC-1/3/12/48 transmission systems
• SDH STM-0/1/4/16 network interfaces
• Fibre Channel optical links
• Gigabit Ethernet connections
• DWDM dual MPD wavelength control modules

Laser Drivers Procurement Notes

Verify the specific package variant, as the ADN2847 family includes both 48-lead and 32-lead LFCSP options with differing pinouts. Confirm that the 32-lead version meets all functional requirements, as it may have reduced functionality compared to the 48-lead counterpart. Ensure compatibility with existing PCB layouts and thermal management strategies for the selected package size.

Laser Drivers Selection Notes

Select this component for designs requiring integrated dual-loop control in a compact form factor. The 32-lead LFCSP package offers a smaller footprint suitable for space-constrained applications. Verify that the required modulation and bias current ranges align with the target laser diode specifications. Consider the trade-off between pin count and feature availability when comparing against the 48-lead variant.

Laser Drivers Part Context

This part belongs to the ADN284x series of laser drivers from Analog Devices, which are optimized for high-speed optical transceivers. The series provides flexible solutions for various SONET/SDH and Ethernet standards. The ADN2847 specifically targets the 3.3 Gbps speed tier, bridging the gap between lower-speed drivers and higher-performance models like the ADN2870.

Laser Drivers Replacement Considerations

The ADN2841 is a related part within the same family but operates up to 2.7 Gbps and typically uses a 48-lead package. The ADN2848 is another alternative but is limited to 1.25 Gbps operation. Verify pin-to-pin compatibility and functional equivalence before substitution, particularly regarding the number of available control loops and alarm outputs.