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LOG102 Status: ACTIVE

Logarithmic and Log Ratio Amplifier


      
         
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 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

Customers Who Evaluated This Product Also Evaluated

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  • RCV420: Precision 4mA to 20mA Current Loop Receiver
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Product Information

Features

  • 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.

Description

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.

    

Pricing / Packaging / CAD Design Tools / Samples

PricePackagingCAD Design ToolsSamples
DeviceStatusTemp (oC)Price | QuantityPackage | PinsTop Side MarkingPackage QTY | Package CarrierSymbolsFootprintsSamples
LOG102AIDACTIVE0 to 708.00 | 1kuSOIC (D) | 14 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
LOG102AIDG4ACTIVE0 to 708.00 | 1kuSOIC (D) | 14 View 50 | 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

Reported Distributor Inventory as of 11:44 AM GMT, 06 Nov 2009
RegionCompanyIn StockPurchase
TI Lead Time*: 4 WeeksLOG102AID
AmericasArrow 380
Avnet 256
Newark 74
AsiaFarnell Asia 108
WPI 219
EuropeArrow Southern Europe 42
Farnell 51
WorldwideDigiKey 184
TI Lead Time*: 4 WeeksLOG102AIDG4
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksLOG102AIDR
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksLOG102AIDRG4
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
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

Most useful technical documents for LOG102 Help

Datasheet

Reference Designs

Description Part # Company
Industrial Control via the CAN Bus Demonstration Platform CANBUS-DEMO Texas Instruments

Simulation Models

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