LOG101 Status:ACTIVE

Logarithmic Amplifier

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Datasheet

LOG101: Precision Logarithmic and Log Ratio Amplifier (Rev. B) (log101.pdf, 456 KB)
10 Jun 2004 Download

	LOG101
Scale Factor(V/decade)	1
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, and General Instrumentation
- PHOTODIODE SIGNAL COMPRESSION AMPS
- ANALOG SIGNAL COMPRESSION IN FRONT OF ANALOG-TO-DIGITAL (A/D)CONVERTERS

Note: Protected under US Patent #6,667,650; other patents pending.

Description

The LOG101 is a versatile integrated circuit that computes the logarithm or log ratio of an input current relative to a reference current.

The LOG101 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 1V 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 LOG101 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
LOG101AID	ACTIVE	-40 to 85	6.95 \| 1ku	SOIC (D) \| 8	View	100 \| TUBE	Contact TI Distributor or Sales Office
LOG101AIDE4	ACTIVE	-40 to 85	6.95 \| 1ku	SOIC (D) \| 8	View	100 \| TUBE	Contact TI Distributor or Sales Office
LOG101AIDR	ACTIVE	-40 to 85	6.95 \| 1ku	SOIC (D) \| 8	View	2500 \| LARGE T&R	Purchase Samples
LOG101AIDRE4	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
LOG101AID	As of 8:50 AM GMT, 20 Aug 2008			As of 8:50 AM GMT, 20 Aug 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	1914 \| 25 Nov	16 Weeks	Americas	Rochester Electronics	>1k
		21 \| 16 Dec
		5634 \| 23 Dec
		>10k \| 13 Jan
LOG101AIDE4	As of 8:50 AM GMT, 20 Aug 2008			As of 8:50 AM GMT, 20 Aug 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	1914 \| 25 Nov	16 Weeks	None Reported View Distributors
		21 \| 16 Dec
		5634 \| 23 Dec
		>10k \| 13 Jan
LOG101AIDR	As of 8:50 AM GMT, 20 Aug 2008			As of 8:50 AM GMT, 20 Aug 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	1914 \| 25 Nov	16 Weeks	Americas	Rochester Electronics	>1k
		21 \| 16 Dec
		5635 \| 23 Dec
		>10k \| 13 Jan
LOG101AIDRE4	As of 8:50 AM GMT, 20 Aug 2008			As of 8:50 AM GMT, 20 Aug 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	1914 \| 25 Nov	16 Weeks	None Reported View Distributors
		21 \| 16 Dec
		5635 \| 23 Dec
		>10k \| 13 Jan
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
LOG101AID	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-3-260C-168 HR	View	View
LOG101AIDE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-3-260C-168 HR	View	View
LOG101AIDR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-3-260C-168 HR	View	View
LOG101AIDRE4	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

LOG101: Precision Logarithmic and Log Ratio Amplifier (Rev. B) (log101.pdf, 456 KB)
10 Jun 2004 Download

Application Notes

View Application Notes for Logarithmic Amplifiers

Simulation Models

Spice Model
- LOG101 PSpice Macro Model and Test Circuit (sboc042.zip, 4 KB)
  28 Jun 2004 zip

More Literature

View More Literature for Logarithmic Amplifiers

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