Ti Introduces Very Wide Dynamic Range, Fast And Accurate Logarithmic Amplifier For Optical Networking, Industrial And Medical Applications

Ti Introduces Very Wide Dynamic Range, Fast And Accurate Logarithmic Amplifier For Optical Networking, Industrial And Medical Applications

Texas Instruments Incorporated (TI) (NYSE: TXN) introduced today a DC precision, high-speed (1 micro-second rise and fall time), precision logarithmic amplifier that computes the logarithm or log-ratio of an input current or voltage relative to a reference current or voltage. The LOG114 can handle eight decades of dynamic range and the completely tested log function allows use without external components. The small size of the LOG114 makes it a good fit for single-supply systems with a limited number of supply rails. (See www.ti.com/SC7071.)

Specifically designed to amplify photodiode signals from fiber optic cables in optical networking communication systems (ONET), the LOG114 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 analog-to-digital converter (ADC). The QFN-16 package allows use in small plug-in modules and multi-channel systems.

The high speed and eight decades of dynamic range (equivalent to 27 bits; 100pA to 10mA input) 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. In addition, the DC precision permits accurate instrumentation system measurements.

The LOG114 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 assure accurate measurement even for low-level signals at relatively higher frequencies, while operating on a low quiescent current of 10mA.

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