AD8304ARUZ-RL7

Overview

The AD8304ARUZ-RL7 is a monolithic logarithmic converter designed for fiber optic systems. It provides an exceptionally large dynamic range of 160 dB, covering input currents from 100 pA to 10 mA. The device features a laser-trimmed logarithmic slope of 10 mV/dB at the VLOG pin and a basic intercept at 100 pA. It operates on a single positive supply voltage ranging from 3.0 V to 5.5 V, with a typical quiescent current of 4.5 mA. The output buffer offers a bandwidth of 10 MHz and a slew rate of 15 V/µs. The component is housed in a 14-lead TSSOP package and is rated for operation between -40°C and +85°C.

Feature Summary

• Optimized for fiber optic photodiode interfacing with adaptive biasing to reduce dark current at low light levels.
• Provides eight full decades of range with accurate laser-trimmed scaling for high precision.
• Features a rail-to-rail output buffer capable of driving significant loads with low impedance.
• Includes chip disable functionality to facilitate use in battery-operated applications.

Applications

• High accuracy optical power measurement
• Wide range baseband log compression
• Versatile detector for APC loops

Procurement Notes

Verify the specific ordering suffix RL7 corresponds to the 7-inch tape and reel packaging option when sourcing this component. Confirm that the manufacturer designation matches Analog Devices Inc. to ensure authenticity. Check for RoHS compliance status as indicated in official documentation before procurement. Ensure the temperature grade aligns with the specified industrial range requirements for your deployment environment.

Selection Notes

Select this component when measuring low-frequency signal power in fiber optic systems requiring wide dynamic range. Consider the 10 mV/dB default slope and 100 pA intercept for standard applications. Evaluate the need for external filtering or slope adjustment resistors based on specific voltage span requirements. Verify compatibility with single-supply operation between 3.0 V and 5.5 V for system integration.

Part Context

This part belongs to the AD8304 series of logarithmic converters manufactured by Analog Devices. It utilizes advanced translinear techniques to achieve precise logarithmic conversion. The series is specifically engineered for versatility and ease of use in optical detection scenarios. The ARUZ variant denotes the surface-mount TSSOP package configuration suitable for automated assembly processes.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.