LOG112 Status:ACTIVE

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

Alert me about changes<br/>to this product

Alert me about changes
to this product

Datasheet

Precision Logarithmic and Log Ratio Amplifier (Rev. D) (log112.pdf, 589 KB)
04 Apr 2005 Download

	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 Type	Internal
Auxiliary Op Amps	1
Full-Scale Output Voltage(Min)(+/- V)	-3.8
Full-Scale Output Voltage(Max)(+/- V)	3.5
Operating Temp Range(Celsius)	-5 to 75
Pin/Package	14SOIC
Rating	Catalog
	Samples
	Inventory

Customers Who Evaluated This Product Also Evaluated

LOG2112: Precision Logarithmic and Log Ratio Amplifier with On-Chip 2.5V Voltage Reference
LOG102: Logarithmic and Log Ratio Amplifier
LOG114: Precision High-Speed Logarithmic Amplifier with 2.5V Reference and Uncommitted Output Op Amps
TS5A23157: Dual 10-Ohm SPDT Analog Switch
ADS8322: Unipolar, 16-Bit, 500kSPS CMOS Analog-to-Digital Converter
ADS8508: 12-Bit 250kHz CMOS Analog-to-Digital Converter w/Serial Interface 2.5V Internal Reference

More Related Products

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. V_LOGOUT 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

			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
LOG112AID	ACTIVE	-5 to 75	7.90 \| 1ku	SOIC (D) \| 14	View	58 \| TUBE	Contact TI Distributor or Sales Office
LOG112AIDE4	ACTIVE	-5 to 75	7.90 \| 1ku	SOIC (D) \| 14	View	58 \| TUBE	Contact TI Distributor or Sales Office
LOG112AIDR	ACTIVE	-5 to 75	7.90 \| 1ku	SOIC (D) \| 14	View	2500 \| LARGE T&R	Purchase Samples
LOG112AIDRE4	ACTIVE	-5 to 75	7.90 \| 1ku	SOIC (D) \| 14	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
LOG112AID	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*	1395 \| 25 Nov	16 Weeks	Americas	DigiKey	48
		15 \| 15 Dec
		>10k \| 22 Dec
LOG112AIDE4	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*	1395 \| 25 Nov	16 Weeks	None Reported View Distributors
		15 \| 15 Dec
		>10k \| 22 Dec
LOG112AIDR	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*	1548 \| 25 Nov	16 Weeks	None Reported View Distributors
		17 \| 16 Dec
		>10k \| 23 Dec
LOG112AIDRE4	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*	1548 \| 25 Nov	16 Weeks	None Reported View Distributors
		17 \| 16 Dec
		>10k \| 23 Dec
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
LOG112AID	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-3-260C-168 HR	View	View
LOG112AIDE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-3-260C-168 HR	View	View
LOG112AIDR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-3-260C-168 HR	View	View
LOG112AIDRE4	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. D) (log112.pdf, 589 KB)
04 Apr 2005 Download

Application Notes

View Application Notes for Logarithmic Amplifiers

Simulation Models

Spice Model
- LOG112 PSpice Macro Model and Test Circuit (sboc044.zip, 5 KB)
  28 Jun 2004 zip

More Literature

View More Literature for Logarithmic Amplifiers

Alternative Products - Are similar to LOG112
Customers Who Evaluated This Product Also Evaluated...
Part #	Name	Comments
LOG2112	Precision Logarithmic and Log Ratio Amplifier with On-Chip 2.5V Voltage Reference	TI customers also evaluated this product.
LOG102	Logarithmic and Log Ratio Amplifier	TI customers also evaluated this product.
LOG114	Precision High-Speed Logarithmic Amplifier with 2.5V Reference and Uncommitted Output Op Amps	TI customers also evaluated this product.
LOG104	Logarithmic Amplifier	TI customers also evaluated this product.
LOG101	Logarithmic Amplifier	TI customers also evaluated this product.
TL441A	Logarithmic Amplifier	TI customers also evaluated this product.
TL441-EP	Enhanced Product Logarithmic Amplifier	TI customers also evaluated this product.

Complementary Products - Can be used with LOG112
Customers Who Evaluated This Product Also Evaluated...
Part #	Name	Product Family	Comments
TS5A23157	Dual 10-Ohm SPDT Analog Switch	SWITCHES AND MULTIPLEXERS-ANALOG SWITCHES/MULTIPLEXERS (less than or equal to 5V)	TI customers also evaluated this product.
ADS8322	Unipolar, 16-Bit, 500kSPS CMOS Analog-to-Digital Converter	DATA CONVERTERS-ANALOG TO DIGITAL CONVERTERS	TI customers also evaluated this product.
ADS8508	12-Bit 250kHz CMOS Analog-to-Digital Converter w/Serial Interface 2.5V Internal Reference	DATA CONVERTERS-ANALOG TO DIGITAL CONVERTERS	TI customers also evaluated this product.
SN74HC244	Octal Buffers And Line Drivers With 3-State Outputs	BUFFERS, DRIVERS AND TRANSCEIVERS-NON-INVERTING BUFFERS AND DRIVERS	TI customers also evaluated this product.
DAC8812	16-Bit, Dual Serial Input Multiplying Digital-to-Analog Converter	DATA CONVERTERS-DIGITAL TO ANALOG CONVERTERS	TI customers also evaluated this product.
SN74AHC1G04	Single Inverter Gate	LITTLE LOGIC-SINGLE-GATES	TI customers also evaluated this product.
BQ2057W	Low Dropout Linear 2-cell Li-Ion Charge Controller with AutoCompTM, 8.4V	BATTERY MANAGEMENT-BATTERY CHARGE MANAGEMENT	TI customers also evaluated this product.
ADS8401	16 Bit 1.25MSPS Parallel ADC W Ref	DATA CONVERTERS-ANALOG TO DIGITAL CONVERTERS	TI customers also evaluated this product.
TPS75533	Single Output LDO, 5.0A, Fixed(3.3V), Low Quiescent Current, Fast Transient Response	LINEAR REGULATORS-SINGLE CHANNEL LDO	TI customers also evaluated this product.
TPS63700	Adjustable, -15V Output Inverting DC/DC Converter in 3x3 QFN	DC/DC CONVERTERS (INTEGRATED SWITCH)-INVERTING REGULATORS	TI customers also evaluated this product.

Support and Community

Customer Tags

No Tags are Available for this Part Number