Precision DC Logarithmic Amplifier - LOG114 - TI

Texas Instruments introduced LOG114, a DC precision logarithmic amplifier that computes the logarithm or log-ratio of an input voltage or current relative to a reference value. The LOG114 Logarithmic Amplifier can handle eight decades of dynamic range and the completely tested log function allows use without external components.

Specifically designed to amplify photodiode signals from fiber optic cables in optical networking communication systems (ONET),

The LOG114 Logarithmic Amplifier is designed to amplify photodiode signals from fiber optic cables in optical networking communication systems. The Logarithmic Amplifier can also be used for industrial and medical optical density/absorbance measurements and general signal compression for a very wide dynamic range of signals in front of an ADC.

The high speed and eight decades of dynamic range with high precision make it highly desirable in laser control systems. It has an internal 2.5V reference and two independent op amps that can be used for offsetting, amplitude scaling, threshold detection or other functions.

The LOG114 Logarithmic Amplifier operates on a single +5V or +/-5V dual supply over a temperature range of -5C to +75C. Excellent gain stability over temperature is achieved using a special thermal compensation technique on the integrated circuit. Low noise, wide bandwidth amplifiers.

The LOG114 Logarithmic Amplifier is shipped in a QFN-16 4mm x 4mm package with price at $7.90 each (1K lot)

Source: TI’s LOG114 Precision  Logarithmic Amplifier