LOG104 Status:ACTIVE

Logarithmic Amplifier

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Datasheet

Precision Logarithmic and Log Ratio Amplifier (Rev. C) (log104.pdf, 451 KB)
04 Apr 2005 Download

	LOG104
Scale Factor(V/decade)	0.5
Input Current Range(Min)(nA)	100
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)	1.5
Reference Type	External
Full-Scale Output Voltage(Min)(+/- V)	1.2
Full-Scale Output Voltage(Max)(+/- V)	1.5
Operating Temp Range(Celsius)	-40 to 85
Pin/Package	8SOIC
Rating	Catalog
	Samples
	Inventory

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Product Information

Features

EASY-TO-USE COMPLETE CORE FUNCTION
HIGH ACCURACY: 0.01% FSO Over 5 Decades
WIDE INPUT DYNAMIC RANGE:
7.5 Decades, 100pA to 3.5mA
LOW QUIESCENT CURRENT: 1mA
WIDE SUPPLY RANGE: ±4.5V to ±18V
APPLICATIONS
- LOG, LOG RATIO, ANTI-LOG COMPUTATION:
  Communication, Analytical, Medical, Industrial, Test, General Instrumentation
- PHOTODIODE SIGNAL COMPRESSION AMP
- ANALOG SIGNAL COMPRESSION IN FRONT OF ANALOG-TO-DIGITAL(A/D)CONVERTER

Note: Protected under US Patent #6,667,650; other patents pending.
All trademarks are the property of their respective owners.

Description

The LOG104 is a versatile integrated circuit that computes the logarithm or log ratio of an input current relative to a reference current.

The LOG104 is tested over a wide dynamic range of input signals. In log ratio applications, a signal current can come from a photodiode, and a reference current from a resistor in series with a precision external reference.

The output signal at V_OUT is trimmed to 0.5V per decade of input current, allowing seven decades of input current, dynamic range.

Low DC offset voltage and temperature drift allow accurate measurement of low-level signals over a wide environmental temperature range. The LOG104 is specified over the temperature range –5°C to +75°C, with operation over –40°C to +85°C.

Pricing / Packaging / CAD Design Tools / Samples

			Price ($US)	Packaging			CAD Design Tools		Samples
Device	Status	Temp (^oC)	Price ($US) \| Quantity	Package \| Pins	Top Side Marking	Package QTY \| Package Carrier	Symbols	Footprints	Samples
LOG104AID	ACTIVE	-40 to 85	6.95 \| 1ku	SOIC (D) \| 8	View	100 \| TUBE	Purchase Samples
LOG104AIDE4	ACTIVE	-40 to 85	6.95 \| 1ku	SOIC (D) \| 8	View	100 \| TUBE	Purchase Samples
LOG104AIDG4	ACTIVE	-40 to 85	6.95 \| 1ku	SOIC (D) \| 8	View	100 \| TUBE	Purchase Samples
LOG104AIDR	ACTIVE	-40 to 85	6.95 \| 1ku	SOIC (D) \| 8	View	2500 \| LARGE T&R	Purchase Samples
LOG104AIDRE4	ACTIVE	-40 to 85	6.95 \| 1ku	SOIC (D) \| 8	View	2500 \| LARGE T&R	Purchase 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

	TI Inventory Status			Reported Distributor Inventory
LOG104AID	As of 8:51 AM GMT, 29 Aug 2008			As of 8:51 AM GMT, 29 Aug 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	4 \| 23 Dec	16 Weeks	Americas	DigiKey	8
	0*	>10k \| 30 Dec	16 Weeks	Americas	Rochester Electronics	>1k
LOG104AIDE4	As of 8:51 AM GMT, 29 Aug 2008			As of 8:51 AM GMT, 29 Aug 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	4 \| 23 Dec	16 Weeks	None Reported View Distributors
	0*	>10k \| 30 Dec	16 Weeks
LOG104AIDG4	As of 8:51 AM GMT, 29 Aug 2008			As of 8:51 AM GMT, 29 Aug 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	4 \| 23 Dec	16 Weeks	None Reported View Distributors
	0*	>10k \| 30 Dec	16 Weeks
LOG104AIDR	As of 8:51 AM GMT, 29 Aug 2008			As of 8:51 AM GMT, 29 Aug 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	4 \| 23 Dec	16 Weeks	Americas	Rochester Electronics	>1k
	0*	>10k \| 30 Dec	16 Weeks
LOG104AIDRE4	As of 8:51 AM GMT, 29 Aug 2008			As of 8:51 AM GMT, 29 Aug 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	4 \| 23 Dec	16 Weeks	None Reported View Distributors
	0*	>10k \| 30 Dec	16 Weeks
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

	Product Content				DPPM / MTBF / FIT Rate
Device	Eco Plan*	Lead / Ball Finish	MSL Rating / Peak Reflow	Details	Details
LOG104AID	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-3-260C-168 HR	View	View
LOG104AIDE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-3-260C-168 HR	View	View
LOG104AIDG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-3-260C-168 HR	View	View
LOG104AIDR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-3-260C-168 HR	View	View
LOG104AIDRE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-3-260C-168 HR	View	View

* 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

Datasheets

Precision Logarithmic and Log Ratio Amplifier (Rev. C) (log104.pdf, 451 KB)
04 Apr 2005 Download

Application Notes

View Application Notes for Logarithmic Amplifiers

Simulation Models

Spice Model
- LOG104 PSpice Macro Model and Test Circuit (sboc043.zip, 4 KB)
  28 Jun 2004 zip
- LOG104 TINA Macro Model and Test Circuit (sboc076.zip, 31 KB)
  14 Oct 2005 zip

More Literature

View More Literature for Logarithmic Amplifiers

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