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LOG104AIDTI/BBN/a50avaiLogarithmic Amplifier


LOG104AID ,Logarithmic AmplifierFEATURES DESCRIPTION The LOG104 is a versatile integrated circuit that computes* EASY-TO-USE COMPLE ..
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LOG104AID
Logarithmic Amplifier
FEA TURES EASY-TO-USE COMPLETE CORE FUNCTION HIGH ACCURACY: 0.01% FSO Over 5 Decades WIDE INPUT DYNAMIC RANGE:
7.5 Decades, 100pA to 3.5mA
LOW QUIESCENT CURRENT: 1mA WIDE SUPPLY RANGE: ±4.5V to ±18V
Precision
LOGARITHMIC AND LOG RA TIO AMPLIFIER
DESCRIPTION

The LOG104 is a versatile integrated circuit that computes
the logarithm or log ratio of an input current relative to a
reference current.
The LOG104 is tested over a wide dynamic range of input
signals. In log ratio applications, a signal current can come
from a photodiode, and a reference current from a resistor in
series with a precision external reference.
The output signal at VOUT is trimmed to 0.5V per decade of
input current, allowing seven decades of input current, dy-
namic range.
Low DC offset voltage and temperature drift allow accurate
measurement of low-level signals over a wide environmental
temperature range. The LOG104 is specified over the tem-
perature range –5°C to +75°C, with operation over –40°C to
+85°C.
APPLICATIONS
LOG, LOG RATIO COMPUTATION:
Communication, Analytical, Medical, Industrial,
Test, General Instrumentation
PHOTODIODE SIGNAL COMPRESSION AMP ANALOG SIGNAL COMPRESSION IN FRONT
OF ANALOG-TO-DIGITAL(A/D) CONVERTER
LOG104

SBOS243C – MAY 2002 – REVISED APRIL 2005
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Note: Protected under US Patent #6,667,650; other patents pending.
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