The TPA8304 is a logarithmic detector optimized for the measurement of low frequency signal power in fiber optic systems and offers a large dynamic range.

Wide measurement range, accuracy and fast step response are achieved, which is very suitable for the requirement of optic system.

The TPA8304 requires only a single positive supply of 5 V. Low quiescent current and chip disable facilitate use in batteryoperated applications.

Features

 7 full decades of range: 1nA to 10mA

 Law conformance error: 0.2 dB from 10nA to 10mA

 Fast step response: raising 0.2μs, falling 5μs for 10nA to 10μA input on INPT

 Basic logarithmic intercept at 100 pA

 Logarithmic slope of 200 mV/20dB (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