Description:

The TPA8304 is a logarithmic detector optimized for themeasurement of low-frequency signal power in fiber opticsystems and offers a large dynamic range.The wide measurement range, accuracy, and fast stepresponse are achieved, which meets the requirements ofan optic system.The TPA8304 requires only a single positive supply of 5V. The low quiescent current and chip disable facilitate areused in battery-operated applications.

Features:

• 7 Full Decades of Range: 1 nA to 10 mA

• Functionally Support 100-pA Current Input

• Low Conformance Error: 0.2 dB from 10 nA to 10 mA

• Fast Step Response: Raising 0.2 μs, Falling 5 μs for10-nA to 10-μA Input on INPT

• Basic Logarithmic Intercept at 100 pA

• Logarithmic Slope of 200 mV/20 dB (at the VLOG Pin)

• Optimized for Fiber Optic Photodiode Interfacing

• Single-Supply Operation: 4.5 V to 5.5 V

• Power-down Mode

Applications:

• High-Accuracy Optical Power Measurement

• Wide-Range Baseband Log Compression

• Versatile Detector for APC Loops

• EDFA