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Logarithmic and Log Ratio Amplifier
 
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Quality: Product Contents, MTBF/FIT Rate and Moisture SensitivityQuality & Pb-Free DataPrice and Packaging InformationPricing/PackagingDownload Application NotesApplication Notes
related productsRelated ProductsInventory, Leadtime, and AvailabilityInventoryModels: BSDL, IBIS, or SPICESimulation Models
Tools & Software: EVMs, CCStudio, and developerTools & SoftwareDownload CAD Design ToolsSymbols/FootprintsAccess Reference DesignsReference Designs

 Datasheet
Download Datasheet
Precision Logarithmic and Log Ratio Amplifier (Rev. B) (log102.pdf, 479 KB)
04 Apr 2005 Download

LOG102
Scale Factor(V/decade)1  
Input Current Range(Min)(nA)1  
Input Current Range(Max)(mA)1  
Conformity Error (initial 5 decades)(Max)(%)0.3  
Conformity Error (initial 5 decades) (typ. over temp)(%/degree C)0.0002  
Offset Voltage (Input Amplifiers)(Max)(mV)1.5  
Vs (+/-)(Min)(V)4.5  
Vs (+/-)(Max)(V)18  
Iq(Max)(mA)2  
Reference TypeExternal  
Auxiliary Op Amps2  
Full-Scale Output Voltage(Min)(+/- V)-4.1  
Full-Scale Output Voltage(Max)(+/- V)3.5  
Operating Temp Range(Celsius)0 to 70  
Pin/Package14SOIC  
RatingCatalog  
 Samples
 Inventory

Product Information
Back to TopFeatures
  • EASY-TO-USE COMPLETE LOG RATIO FUNCTION
  • OUTPUT AMPLIFIERS FOR SCALING AND SIGNAL LOSS INDICATION
  • HIGH ACCURACY: 0.15% FSO Total Error Over 6 Decades
  • WIDE INPUT DYNAMIC RANGE:
       6 Decades, 1nA to 1mA
  • LOW QUIESCENT CURRENT: 1.25mA
  • SO-14 PACKAGE
  • APPLICATIONS
    • ONET, OPTICAL POWER METERS
    • LOG, LOG RATIO COMPUTATION: Communication, Analytical, Medical, Industrial, Test, General Instrumentation
    • PHOTODIODE SIGNAL COMPRESSION AMP
    • ANALOG SIGNAL COMPRESSION IN FRONT OF A/D CONVERTER
    • ABSORBANCE MEASUREMENT
    • OPTICAL DENSITY MEASUREMENT

NOTE: U.S. Patent Pending.
All trademarks are the property of their respective owners.
Back to TopDescription

The LOG102 is a versatile integrated circuit that computes the logarithm or log ratio of an input current relative to a reference current.

The LOG102 is tested over a wide dynamic range of input signals. In log ratio applications, a signal current can be generated by a photodiode, and a reference current from a resistor in series with a precision external voltage reference.

In the block diagram shown below, A3 and A4 are identical, uncommitted op amps that can be used for a variety of functions, such as filtering, offsetting, adding gain or as a comparator to detect loss of signal.

The output signal at VLOG OUT is trimmed to 1V per decade of input current. It can be scaled with an output amplifier, either A3 or A4.

Low dc offset voltage and temperature drift allow accurate measurement of low-level signals over a wide environmental temperature range. The LOG102 is specified over the temperature range, 0°C to +70°C, with operation over –40°C to +85°C.
Analog eLab(TM) Design Center

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Pricing/Packaging/CAD Design Tools/Samples
Back to TopPricePackagingCAD Design ToolsSamples
DeviceStatusTemp (oC)Budget Price
($US) | QTY		Industry Standard
(TI Pkg) | Pins		Top Side MarkingStandard Pack Quantity | Package CarrierSymbolsFootprintsSamples
LOG102AIDACTIVE0 to 707.25 | 1kuSOIC (D) | 14 View 58 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintRequest Free Samples
LOG102AIDG4ACTIVE0 to 707.25 | 1kuSOIC (D) | 14 View 58 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintContact TI Distributor or Sales Office
LOG102AIDRACTIVE0 to 707.25 | 1kuSOIC (D) | 14 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
LOG102AIDRG4ACTIVE0 to 707.25 | 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
Back to TopTI Inventory StatusReported Distributor Inventory
LOG102AIDAs of 8:49 AM GMT, 20 Jul 2008As of 8:49 AM GMT, 20 Jul 2008
 In StockIn Progress QTY | DateLead TimeRegionCompanyIn StockPurchase
 0* 17 | 27 Oct 16 Weeks AmericasNewark 253 Buy Now
 >10k | 3 Dec EuropeFarnell 238 Buy Now
LOG102AIDG4As of 8:49 AM GMT, 20 Jul 2008As of 8:49 AM GMT, 20 Jul 2008
 In StockIn Progress QTY | DateLead TimeRegionCompanyIn StockPurchase
 0* 17 | 27 Oct 16 Weeks None Reported
View Distributors		  
 >10k | 3 Dec    
LOG102AIDRAs of 8:49 AM GMT, 20 Jul 2008As of 8:49 AM GMT, 20 Jul 2008
 In StockIn Progress QTY | DateLead TimeRegionCompanyIn StockPurchase
 0* >10k | 4 Dec 16 Weeks None Reported
View Distributors		  
LOG102AIDRG4As of 8:49 AM GMT, 20 Jul 2008As of 8:49 AM GMT, 20 Jul 2008
 In StockIn Progress QTY | DateLead TimeRegionCompanyIn StockPurchase
 0* >10k | 4 Dec 16 Weeks None Reported
View Distributors		  
View all Distributors
 
* Our information is updated daily, so please check back with us soon if this does not meet your needs. You may also contact your TI Authorized Distributor , including those listed above, for real time stock information.** 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
Back to TopProduct ContentDPPM / MTBF / FIT Rate
DeviceEco Plan* Lead / Ball FinishMSL Rating / Peak ReflowDetailsDetails
LOG102AID RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-3-260C-168 HRViewView
LOG102AIDG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-3-260C-168 HRViewView
LOG102AIDR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-3-260C-168 HRViewView
LOG102AIDRG4 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
Back to TopDatasheets
Precision Logarithmic and Log Ratio Amplifier (Rev. B) (log102.pdf, 479 KB)
04 Apr 2005 Download
Back to TopApplication Notes
View Application Notes for Logarithmic Amplifiers
Back to TopSimulation Models
Spice Model
LOG102 PSpice Macro Model and Test Circuit (sboc013.zip, 6 KB)
10 Jul 2003 zip
Back to TopMore Literature
View More Literature for Logarithmic Amplifiers

Reference Designs
Back to TopDescription Part # Company
Industrial Control via the CAN Bus Demonstration Platform CANBUS-DEMO Texas Instruments

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