LOG112 Precision Logarithmic and Log Ratio Amplifier with On-Chip 2.5V Voltage Reference | TI.com

LOG112
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Precision Logarithmic and Log Ratio Amplifier with On-Chip 2.5V Voltage Reference

Precision Logarithmic and Log Ratio Amplifier with On-Chip 2.5V Voltage Reference - LOG112
Datasheet
 

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 reference 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 temperature 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
  • 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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Parametrics

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Part number Order Scale factor (V/decade) Input current range (Min) (nA) Input current range (Max) (mA) Conformity error (initial 5 decades) (Max) (%) Conformity error (initial 5 decades) (typ. over temp) (%/degree C) Offset voltage (input amplifiers) (Max) (mV) Vs (+/-) (Min) (V) Vs (+/-) (Max) (V) Iq (Max) (mA) Reference type Auxiliary op amps Full-scale output voltage (Min) (+/- V) Full-scale output voltage (Max) (+/- V) Operating temperature range (C) Package Group Package size: mm2:W x L (PKG) Specified voltage (+/- V)
LOG112 Order now 0.5     1     3.5     0.2     0.0001     1.5     4.5     18     1.75     Internal     1     -3.8     3.5     -40 to 85     SOIC | 14     14SOIC: 52 mm2: 6 x 8.65 (SOIC | 14)     5