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LOG112 Status: ACTIVE

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


      
         
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 LOG112
Scale Factor(V/decade)0.5  
Input Current Range(Min)(nA)1  
Input Current Range(Max)(mA)3.5  
Conformity Error (initial 5 decades)(Max)(%)0.2  
Conformity Error (initial 5 decades) (typ. over temp)(%/degree C)0.0001  
Offset Voltage (Input Amplifiers)(Max)(mV)1.5  
Vs (+/-)(Min)(V)4.5  
Vs (+/-)(Max)(V)18  
Iq(Max)(mA)1.75  
Reference TypeInternal  
Auxiliary Op Amps1  
Full-Scale Output Voltage(Min)(+/- V)-3.8  
Full-Scale Output Voltage(Max)(+/- V)3.5  
Operating Temp Range(Celsius)-5 to 75  
Pin/Package14SOIC  
RatingCatalog  
 Samples
 Inventory

Customers Who Evaluated This Product Also Evaluated

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  • LOG101: Logarithmic Amplifier
  • TVP5160: NTSC/PAL/SECAM/Component 10-bit Digital Video Decoder with MacrovisionTM Detection, 3D-YC/5-Line Com
  • SN74LVC1G14: Single Schmitt-Trigger Inverter
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Product Information

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

All 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. 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.

    

Pricing / Packaging / CAD Design Tools / Samples

PricePackagingCAD Design ToolsSamples
DeviceStatusTemp (oC)Price | QuantityPackage | PinsTop Side MarkingPackage QTY | Package CarrierSymbolsFootprintsSamples
LOG112AIDACTIVE-5 to 758.70 | 1kuSOIC (D) | 14 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintContact TI Distributor or Sales Office
LOG112AIDE4ACTIVE-5 to 758.70 | 1kuSOIC (D) | 14 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintContact TI Distributor or Sales Office
LOG112AIDRACTIVE-5 to 757.90 | 1kuSOIC (D) | 14 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
LOG112AIDRE4ACTIVE-5 to 757.90 | 1kuSOIC (D) | 14 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples

* Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For higher volume price quotes,prices in local currency or delivery quotes, please contact your local Texas Instruments Sales Office or Authorized Distributor.

Inventory

Reported Distributor Inventory as of 11:55 AM GMT, 24 Nov 2009
RegionCompanyIn StockPurchase
TI Lead Time*: 20 WeeksLOG112AID
AsiaFarnell Asia 21
EuropeArrow Southern Europe 18
Farnell 19
WorldwideDigiKey 12
TI Lead Time*: 20 WeeksLOG112AIDE4
WorldwideDigiKey  Available
Mouser Electronics 29
TI Lead Time*: 20 WeeksLOG112AIDR
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksLOG112AIDRE4
WorldwideDigiKey  Available
View all Distributors  

** Lead time information is not available at this time. However, our information is updated daily so please check back with us soon. Please contact your preferred TI Authorized Distributor for additional information.

Quality & Lead (Pb)-Free Data

 Product ContentDPPM / MTBF / FIT Rate
DeviceEco Plan* Lead / Ball FinishMSL Rating / Peak ReflowDetailsDetails
LOG112AID RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-3-260C-168 HRViewView
LOG112AIDE4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-3-260C-168 HRViewView
LOG112AIDR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-3-260C-168 HRViewView
LOG112AIDRE4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-3-260C-168 HRViewView

* The planned eco-friendly classification: Pb-Free (RoHS) or Pb-Free (RoHS Exempt) or Green (RoHS & no Sb/Br) - please click on the Product Content Details "View" link in the table above for the latest availability information and additional product content details.

If the information you are requesting is not available online at this time, contact one of our Product Information Centers regarding the availability of this information.

Technical Documents

Most useful technical documents for LOG112 Help

Datasheet

Simulation Models

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