LOG112 Texas instruments

LOG112

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LOG112

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Описание

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.

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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Scale factor (V/decade)	0.5
Input current range (min) (nA)	1
Input current range (max) (mA)	3.5
Offset voltage (input amplifiers) (max) (mV)	1.5
Vs (±) (min) (V)	4.5
Vs (±) (max) (V)	18
Iq (max) (mA)	1.75
Dynamic range (typ) (dB)	150
Reference type	Internal
Auxiliary op amps	1
Full-scale output voltage (min) (±V)	-3.8
Full-scale output voltage (max) (±V)	3.5
Conformity error (initial 5 decades) (max) (%)	0.2
Conformity error (initial 5 decades) (typ. over temp) (%/°C)	0.0001
Operating temperature range (°C)	-40 to 85
Specified voltage (±V)	5
Rating	Catalog