GENERAL DESCRIPTION

The ADL5306∗ is a low cost microminiature logarithmic converter optimized for determining optical power in fiber optic systems. The ADL5306 is derived from the AD8304 and AD8305 translinear logarithmic converters. This family of devices provides wide measurement dynamic range in a versatile and easy-to-use form. A single-supply voltage between 3 V and 5.5 V is adequate; dual supplies may optionally be used. Low quiescent current (5 mA typical) permits use in battery-operated applications.

FEATURES

Optimized for fiber optic photodiode interfacing

Measures current over 3 decades Law conformance 0.1 dB from 100 nA to 100 μA

Single- or dual-supply operation (3 V to ±5.5 V total)

Full log-ratio capabilities

Temperature stable

Nominal slope of 10 mV/dB (200 mV/decade)

Nominal intercept of 1 nA (set by external resistor) Optional adjustment of slope and intercept

Rapid response time for a given current level

Miniature 16-lead chip scale package (LFCSP 3 mm × 3 mm)

Low power: ~5 mA quiescent current

APPLICATIONS

Low cost optical power measurement

Wide range baseband logarithmic compression

Measurement of current and voltage ratios

Optical absorbance measurement