Logarithmic Amplifier - LOG101

LOG101 (ACTIVE)

Logarithmic Amplifier

Description

The LOG101 is a versatile integrated circuit that computes the logarithm or log ratio of an input current relative to a reference current.

The LOG101 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 1V per decade of input current allowing seven decades of input current dynamic range.

Low DC offset voltage and temperature drift allow accurate measurement of low-level signals over a wide environmental temperature range. The LOG101 is specified over the temperature range –5°C to +75°C, with operation over –40°C to +85°C.

Features

  • 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
  • APPLICATIONS
    • LOG, LOG RATIO, ANTI-LOG COMPUTATION:
           Communication, Analytical, Medical, Industrial, Test, and General Instrumentation
    • PHOTODIODE SIGNAL COMPRESSION AMPS
    • ANALOG SIGNAL COMPRESSION IN FRONT OF ANALOG-TO-DIGITAL (A/D)CONVERTERS

Note: Protected under US Patent #6,667,650; other patents pending.

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Parametrics Compare all products in Logarithmic Amplifier

 
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
Full-Scale Output Voltage (Min) (+/- V)
Full-Scale Output Voltage (Max) (+/- V)
Operating Temperature Range (C)
Rating
Pin/Package
Package Group
Estimated Package Size (WxL) (mm2)
Approx. Price (US$)
Specified Voltage (+/- V)
LOG101
1    
100    
3.5    
0.2    
0.0001    
1.5    
4.5    
18    
1.5    
External    
1.2    
1.5    
-40 to 85    
Catalog    
8SOIC    
SOIC    
8SOIC: 3.91 x 4.9: 29 mm2    
6.95 | 1ku    
5    

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