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Logarithmic Amplifier From TI Provides Precision Signal Measurement For Optical Networking, Industrial and Medical Equipment |
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2/28/2002 TUCSON, Ariz., Feb 28, 2002 /PRNewswire via COMTEX/ -- Providing the precision signal measurement demanded in high-volume optical networking, industrial and medical laboratory applications, Texas Instruments (TI) Incorporated (NYSE: TXN) today introduced a low-power logarithmic amplifier which computes the logarithm or log ratio of an input current relative to a reference or second input current. (See www.amplifier.ti.com/hpl7736u ). The unique 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 fiber-optic cables and laboratory applications require precise logarithmic measurements. 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 analog 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 12-bit A/D converter resulting in an effective 20-bit dynamic range. With supply voltages ranging from +/-4.5V 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 0C to +70C with operation from -40C to +125C. Available Today The LOG102 is packaged in an SO-14 and priced at $18.60 in 1,000 piece quantities (suggested resale pricing). Texas Instruments Incorporated is the world leader in digital signal processing and analog technologies, the semiconductor engines of the Internet age. In addition to Semiconductor, the company's businesses include Sensors & Controls, and Educational & Productivity Solutions. TI is headquartered in Dallas, Texas, and has manufacturing, design or sales operations in more than 25 countries. Texas Instruments is traded on the New York Stock Exchange under the symbol TXN. More information is located on the World Wide Web at www.ti.com .
SOURCE Texas Instruments Incorporated
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