LOG112 Series

Precision logarithmic and log ratio amplifier with on-chip 2.5-V voltage reference

Catalog

Precision logarithmic and log ratio amplifier with on-chip 2.5-V voltage reference

Part	Voltage - Input Offset	-3db Bandwidth	Package / Case [x]	Package / Case [y]	Package / Case	Mounting Type	Voltage - Supply Span (Max) [Max]	Current - Input Bias	Gain Bandwidth Product	Amplifier Type	Current - Supply	Operating Temperature [Max]	Operating Temperature [Min]	Number of Circuits
Texas Instruments LOG112AIDG4	300 çV	45 kHz	0.154 in	3.9 mm	14-SOIC	Surface Mount	36 V	5 pA	1.4 MHz	Logarithmic and Log Ratio	1.25 mA	75 ░C	-5 °C	1

Catalog

Precision logarithmic and log ratio amplifier with on-chip 2.5-V voltage reference

Key Features

• EASY-TO-USE COMPLETE FUNCTIONOUTPUT SCALING AMPLIFIERON-CHIP 2.5V VOLTAGE REFERENCEHIGH ACCURACY: 0.2% FSO Over 5 DecadesWIDE INPUT DYNAMIC RANGE:7.5 Decades, 100pA to 3.5mALOW QUIESCENT CURRENT: 1.75mAWIDE SUPPLY RANGE: ±4.5V to ±18VPACKAGES: SO-14 (narrow) and SO-16APPLICATIONSLOG, LOG RATIO:Communication, Analytical, Medical, Industrial, Test, General InstrumentationPHOTODIODE SIGNAL COMPRESSION AMPANALOG SIGNAL COMPRESSION IN FRONT OF ANALOG-TO-DIGITAL (A/D) CONVERTERABSORBANCE MEASUREMENTOPTICAL DENSITY MEASUREMENTAll trademarks are the property of their respective owners.EASY-TO-USE COMPLETE FUNCTIONOUTPUT SCALING AMPLIFIERON-CHIP 2.5V VOLTAGE REFERENCEHIGH ACCURACY: 0.2% FSO Over 5 DecadesWIDE INPUT DYNAMIC RANGE:7.5 Decades, 100pA to 3.5mALOW QUIESCENT CURRENT: 1.75mAWIDE SUPPLY RANGE: ±4.5V to ±18VPACKAGES: SO-14 (narrow) and SO-16APPLICATIONSLOG, LOG RATIO:Communication, Analytical, Medical, Industrial, Test, General InstrumentationPHOTODIODE SIGNAL COMPRESSION AMPANALOG SIGNAL COMPRESSION IN FRONT OF ANALOG-TO-DIGITAL (A/D) CONVERTERABSORBANCE MEASUREMENTOPTICAL DENSITY MEASUREMENTAll trademarks are the property of their respective owners.

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. VLOGOUTof 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. The LOG112 and LOG2112 are versatile integrated circuits that compute the logarithm or log ratio of an input current relative to a reference current. VLOGOUTof 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.