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LOG112AIDR Datasheet(PDF) 1 Page - Texas Instruments |
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LOG112AIDR Datasheet(HTML) 1 Page - Texas Instruments |
1 / 20 page LOG112 LOG2112 SBOS246D – JUNE 2002 – REVISED APRIL 2005 www.ti.com 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. VLOGOUT 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 refer- ence 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 tem- perature range of –5 °C to +75°C. FEATURES q EASY-TO-USE COMPLETE FUNCTION q OUTPUT SCALING AMPLIFIER q ON-CHIP 2.5V VOLTAGE REFERENCE q HIGH ACCURACY: 0.2% FSO Over 5 Decades q WIDE INPUT DYNAMIC RANGE: 7.5 Decades, 100pA to 3.5mA q LOW QUIESCENT CURRENT: 1.75mA q WIDE SUPPLY RANGE: ±4.5V to ±18V q PACKAGES: SO-14 (narrow) and SO-16 PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2002-2005, Texas Instruments Incorporated Precision LOGARITHMIC AND LOG RATIO AMPLIFIERS Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. APPLICATIONS q LOG, LOG RATIO: Communication, Analytical, Medical, Industrial, Test, General Instrumentation q PHOTODIODE SIGNAL COMPRESSION AMP q ANALOG SIGNAL COMPRESSION IN FRONT OF ANALOG-TO-DIGITAL (A/D) CONVERTER q ABSORBANCE MEASUREMENT q OPTICAL DENSITY MEASUREMENT LOG1 12 LOG2 112 A 2 A 1 Q 1 Q 2 C C I 1 V REF – GND NOTE: Internal resistors are used to compensate gain change over temperature. The V CM pin is internally connected to GND in the LOG2112. V O3 V+ GND LOG112 V LOGOUT = (0.5V)LOG (I1/I2) V O3 = K (0.5V)LOG (I1/I2), K = 1 + R2/R1 A 3 R 2 R 1 V REF R REF +IN3 V LOGOUT –IN3 V– V CM I 2 V REF All trademarks are the property of their respective owners. |
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