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LOG112AIDTIN/a100avaiPrecision Logarithmic and Log Ratio Amplifier with On-Chip 2.5V Voltage Reference
LOG112AIDTI,TIN/a100avaiPrecision Logarithmic and Log Ratio Amplifier with On-Chip 2.5V Voltage Reference
LOG112AIDRTI/BBN/a33avaiPrecision Logarithmic and Log Ratio Amplifier with On-Chip 2.5V Voltage Reference


LOG112AID ,Precision Logarithmic and Log Ratio Amplifier with On-Chip 2.5V Voltage ReferenceELECTRICAL CHARACTERISTICSBoldface limits apply over the specified temperature range, T = –5°C to + ..
LOG112AIDR ,Precision Logarithmic and Log Ratio Amplifier with On-Chip 2.5V Voltage Referencefeatures a 2.5V voltage refer-7.5 Decades, 100pA to 3.5mAence that may be used to generate a precis ..
LOG114AIRGVR ,Precision High-Speed Logarithmic Amplifier with 2.5V Reference and Uncommitted Output Op AmpsELECTRICAL CHARACTERISTICS: V = 5V SBoldface limits apply over the specified temperature range, T ..
LOG114AIRGVRG4 ,Precision High-Speed Logarithmic Amplifier with 2.5V Reference and Uncommitted Output Op Amps 16-VQFN 0 to 70MAXIMUM RATINGSInstruments recommends that all integrated circuits beSupply Voltage, V+ to V− . . . ..
LOG114AIRGVT ,Precision High-Speed Logarithmic Amplifier with 2.5V Reference and Uncommitted Output Op AmpsFEATURES DESCRIPTIONThe LOG114 is specifically designed for measuring ADVANTAGES:low-level and wid ..
LOG2112AIDW ,Precision Logarithmic and Log Ratio Amplifier with On-Chip 2.5V Voltage Referencefeatures a 2.5V voltage refer-7.5 Decades, 100pA to 3.5mAence that may be used to generate a precis ..
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LOG112AID-LOG112AIDR
Precision Logarithmic and Log Ratio Amplifier with On-Chip 2.5V Voltage Reference
LOG112
LOG2112

SBOS246D – JUNE 2002 – REVISED APRIL 2005
DESCRIPTION

The LOG112 and LOG2112 are versatile integrated circuits
that compute the logarithm or log ratio of an input current
relative to a reference current. VLOGOUT of the LOG112 and
LOG2112 are trimmed to 0.5V per decade of input current,
ensuring high precision over a wide dynamic range of input
signals.
The LOG112 and LOG2112 features a 2.5V voltage refer-
ence that may be used to generate a precision current
reference using an external resistor.
Low DC offset voltage and temperature drift allow accurate
measurement of low-level signals over the specified tem-
perature range of –5°C to +75°C.
FEATURES
EASY-TO-USE COMPLETE FUNCTION OUTPUT SCALING AMPLIFIER ON-CHIP 2.5V VOLTAGE REFERENCE HIGH ACCURACY: 0.2% FSO Over 5 Decades WIDE INPUT DYNAMIC RANGE:
7.5 Decades, 100pA to 3.5mA
LOW QUIESCENT CURRENT: 1.75mA WIDE SUPPLY RANGE: ±4.5V to ±18V PACKAGES: SO-14 (narrow) and SO-16
Precision
LOGARITHMIC AND LOG RA TIO AMPLIFIERS

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.
APPLICATIONS
LOG, LOG RATIO:
Communication, Analytical, Medical, Industrial,
Test, General Instrumentation
PHOTODIODE SIGNAL COMPRESSION AMP ANALOG SIGNAL COMPRESSION IN FRONT
OF ANALOG-TO-DIGITAL (A/D) CONVERTER ABSORBANCE MEASUREMENT OPTICAL DENSITY MEASUREMENT
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