Product category: Analogue and Mixed Signal ICs
News Release from: Texas Instruments (April 2001-March 2006) | Subject: LOG102
Edited by the Electronicstalk Editorial Team on 4 March 2002
Log amp provides
precision signal measurement
Texas Instruments has released a low-power logarithmic amplifier which computes the logarithm or log ratio of an input current relative to a reference or second input current
The novel LOG102 features low supply voltages, wide input dynamic range, excellent AC stability and two uncommitted on-chip op amps to provide unparalleled design flexibility and accuracy for laser diode monitoring, optical signal compression and absorbance measurement. optical networking applications require measurement of very wide dynamic range due to signal variation through fibre-optic cables and laboratory applications require precise logarithmic measurements.
This article was originally published on Electronicstalk on 4 March 2002 at 8.00am (UK)
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The LOG102 features a complete solution for compressing many decades of signal strength as well as accurately measuring the ratio of two photodiode currents.
'In response to high demand in the optical network market, TI has developed this new generation of a highly successful and unique analogue circuit', said John Brown, strategic marketing engineer for TI's high-performance linear products.
The LOG102 measures input currents from 1nA to 1mA with 0.5% accuracy (output voltage changes 1V for each decade change of input current).
This permits six decades of signal range to be measured with a 12bit A/D convertor resulting in an effective 20bit dynamic range.
With supply voltages ranging from +/-4.5 to +/-18V, and typical quiescent current of 1.25mA, the LOG102 is useful in many low-power applications.
The two uncommitted op amps can be used for a variety of functions such as gain scaling, inverting, filtering, offsetting, and level comparison to detect loss of signal.
This device has been designed for high stability over temperature, which is difficult to achieve in discrete designs.
The LOG102 is specified from 0 to +70C with operation from -40 to +125C.
The LOG102 is packaged in an SO-14 and priced at $18.60 in 1000 piece quantities (suggested resale pricing).
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