ADN2891ACPZ-500RL7

Overview

The ADN2891ACPZ-500RL7 is a single-channel limiting amplifier manufactured by Analog Devices Inc. It operates at data rates up to 3.2 Gbps with a differential input sensitivity of 4 mV p-p and accepts overload voltages up to 2.0 V p-p. The device features CML outputs with controlled rise and fall times, an integrated programmable loss-of-signal detector, and a received signal strength indicator for SFF-8472 compliance. It functions on a single 3.3 V supply with low power dissipation of 145 mW. The component is housed in a compact 3 mm × 3 mm, 16-lead LFCSP package and supports an extended operating temperature range from −40°C to +95°C.

Feature Summary

• Integrated RSSI and LOS detection eliminates external circuitry requirements
• Optimized for SONET, Gigabit Ethernet, and Fibre Channel applications
• Space-saving 16-lead LFCSP package design

Applications

• SFP/SFF/GBIC optical transceivers
• OC-3/OC-12/OC-48 receivers
• Gigabit Ethernet (GbE) receivers
• Fibre Channel (FC) receivers
• 10GBASE-LX4 transceivers

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm packaging quantity and RoHS compliance status. Ensure that the selected variant matches the required thermal and electrical specifications for the target application environment before finalizing procurement decisions.

Selection Notes

Select this component for high-speed optical receiver front-ends requiring precise signal monitoring. The integrated RSSI functionality simplifies board layout by removing the need for separate photodiode bias monitoring circuits. Consider the thermal resistance characteristics when designing the PCB ground plane connections to ensure reliable operation within the specified temperature limits.

Part Context

This part belongs to the ADN2891 series of limiting amplifiers designed for optoelectronic conversion. It serves as a critical interface between optical transceivers and host digital logic, providing signal conditioning and diagnostic capabilities essential for maintaining link integrity in high-speed communication networks.

Replacement Considerations

Consult the official Analog Devices ordering guide for verified substitute part numbers. Confirm that any replacement maintains identical pinout compatibility, electrical performance parameters, and package dimensions to ensure seamless integration without redesigning the host printed circuit board.

FAQ

How is the Loss of Signal (LOS) threshold configured?

The LOS threshold is user-programmable via a resistor connected between the THRADJ pin and VEE, allowing adjustment typically between 3.5 mV p-p and 35 mV p-p.

What is the purpose of the CAZ1 and CAZ2 pins?

These pins allow for the connection of an external capacitor to compensate for input offset voltage, which is particularly beneficial for SONET applications to improve signal integrity.